Atmel AT30TS75 9- to 12-bit Selectable, ±0.5°C Accurate Digital Temperature Sensor

Atmel AT30TS75 9- to 12-bit Selectable, ±0.5°C Accurate Digital Temperature Sensor
Atmel AT30TS75
9- to 12-bit Selectable, ±0.5°C Accurate
Digital Temperature Sensor
DATASHEET
See Applicable Errata in Section 12.
Features
 Single 2.7V - 5.5V supply
 Measures temperature from -55C to +125C
 Highly accurate temperature measurements requiring no external components
±0.5C accuracy (typical) over the 0C to +85C range
±1.0C accuracy (typical) over the -25C to +105C range
 ±2.0C accuracy (typical) over the -40C to +125C range


 User-configurable resolution

9 to 12 bits (0.5C to 0.0625C)
 User-configurable high and low temperature limits
 ALERT output pin for indicating temperature alarms
 2-wire I2C and SMBus™ compatible serial interface
Supports SMBus Timeout
Supports SMBus Alert and Alert Response Address (ARA)
 Selectable addressing allows up to eight devices on the same bus


 I2C High-Speed (HS) mode compatible

3.4MHz maximum clock frequency
 Built-in noise suppression filtering for clock and data input signals
 Low power dissipation

75μA active current (typical) during temperature measurements
 Shutdown mode to minimize power consumption

1μA shutdown current (typical)
 One-shot mode for single temperature measurement while in Shutdown mode
 Pin and software compatible to industry-standard LM75-type devices
 Industry standard green (Pb/Halide-free/RoHS compliant) package options
8-lead SOIC (150-mil)
8-lead MSOP (3 x 3mm)
 8-pad Ultra Thin DFN (UDFN - 2 x 3 x 0.6mm)


8748B–DTS–4/12
T ab le of Cont ent s
1. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2. Pin Descriptions and Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3. Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4. Device Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.1
4.2
4.3
4.4
Start Condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stop Condition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Acknowledge (ACK) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
No-Acknowledge (NACK) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7
7
7
8
5. Device Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.1
5.2
5.3
5.4
High-Speed Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Temperature Measurements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Temperature Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.3.1
Fault Tolerance Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.3.2
Comparator Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.3.3
Interrupt Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Shutdown Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.4.1
One-shot Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6. Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6.1
6.2
6.3
6.4
Pointer Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Temperature Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.3.1
OS Bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.3.2
R1:R0 Bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.3.3
FT1:FT0 Bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.3.4
POL Bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.3.5
CMP/INT Bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.3.6
SD Bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TLOW and THIGH Limit Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14
16
18
19
19
19
19
20
20
21
7. SMBus Features and I2C General Call . . . . . . . . . . . . . . . . . . . . . . 23
7.1
7.2
7.3
SMBus Alert . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
SMBus Timeout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
General Call . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
8. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
8.1
8.2
8.3
8.4
8.5
8.6
8.7
8.8
8.9
Absolute Maximum Ratings* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC and AC Operating Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Temperature Sensor Accuracy and Conversion Characteristics . . . . . . . . . .
AC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power-up Conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pin Capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input Test Waveforms and Measurement Levels . . . . . . . . . . . . . . . . . . . . . .
Output Test Load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Atmel AT30TS75 [DATASHEET]
8748B–DTS–4/12
25
25
26
27
27
28
29
29
29
2
9. Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
9.1
9.2
Atmel Ordering Code Detail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Green Package Options (Pb/Halide-Free/RoHS Compliant) . . . . . . . . . . . . . 30
10. Part Marking Detail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
11. Packaging Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
11.1
11.2
11.3
8S1 - JEDEC SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
8XM - MSOP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
8MA2 - UDFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
12. Errata . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
12.1
12.2
12.3
12.4
DC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Temperature Sensor Accuracy Characteristics. . . . . . . . . . . . . . . . . . . . . . . .
Fault Counter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ALERT pin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
35
36
37
37
13. Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Atmel AT30TS75 [DATASHEET]
8748B–DTS–4/12
3
1.
Description
The Atmel® AT30TS75 is a complete, precise temperature monitoring device designed for use in a variety of applications
that require the measuring of local temperatures as an integral part of the system's function and/or reliability. The
AT30TS75 device combines a high-precision digital temperature sensor, programmable high and low temperature
alarms, and a 2-wire I2C and SMBus (System Management Bus) compatible serial interface into a single, compact
package.
The temperature sensor can measure temperatures over the full -55C to +125C temperature range and has a typical
accuracy as precise as ±0.5C from 0C to +85C. The result of the digitized temperature measurements are stored in
one of the AT30TS75 internal registers, which is readable at any time through the device's serial interface.
The AT30TS75 utilizes flexible, user-programmable internal registers to configure the temperature sensor's performance
and response to high and low temperature conditions. A dedicated alarm output activates if the temperature
measurement exceeds the user-defined temperature and fault count limits. To reduce current consumption and save
power, the AT30TS75 features a Shutdown mode that turns off all internal circuitry except for the internal Power-On
Reset (POR) and serial interface circuits.
The AT30TS75 is factory-calibrated and requires no external components to measure temperature. With its flexibility
and high-degree of accuracy, the AT30TS75 is ideal for extended temperature measurements in a wide variety of
communication, computer, consumer, environmental, industrial, and instrumentation applications.
Atmel AT30TS75 [DATASHEET]
8748B–DTS–4/12
4
2.
Pin Descriptions and Pinouts
Table 1.
Pin Description
Symbol
Name and Function
SCL
Serial Clock: This pin is used to provide a clock to the device and is used to control
the flow of data to and from the device. Command and input data present on the SDA
pin is always latched in on the rising edge of SCL, while output data on the SDA pin is
always clocked out on the falling edge of SCL.
Asserted
State
Type
—
Input
—
Input/Output
—
Output
—
Input
—
Power
—
Power
The SCL pin must either be forced high when the serial bus is idle or pulled-high using
an external pull-up resistor.
SDA
Serial Data: The SDA pin is an open-drain bidirectional input/output pin used to
serially transfer data to and from the device.
The SDA pin must be pulled-high using an external pull-up resistor and may be
wire-ANDed with any number of other open-drain or open-collector pins from other
devices on the same bus.
ALERT
Alert: The ALERT pin is an open-drain output pin used to indicate when the
temperature goes beyond the user-programmed temperature limits. The ALERT pin
can be operated in one of two different modes (Interrupt or Comparator mode) as
defined by the CMP/INT bit in the Configuration Register. The ALERT pin defaults to
an active-low output upon device power-up or reset but can be reconfigured as an
active-high output by setting the POL bit in the Configuration Register.
This pin can be wire-ANDed together with ALERT pins from other devices on the same
bus. When wire-ANDing pins together, the ALERT pin should be configured as an
active-low output so that when a single ALERT pin on the common alert bus goes
active, the entire common alert bus will go low and the host controller will be properly
notified since other ALERT pins that may be in the inactive-high state will not mask the
true alert signal. In an SMBus environment, the SMBus host can respond by sending
an SMBus ARA (Alert Response Address) command to determine which device on the
SMBus generated the alert signal.
The ALERT pin must be pulled-high using an external pull-up resistor even when it is
not used. Care must also be taken to prevent this pin from being shorted directly to
ground without a resistor at any time whether during testing or normal operation.
A2-0
Address Inputs: The A2-0 pins are used to select the device address and correspond
to the three least-significant bits (LSBs) of the I2C/SMBus 7-bit slave address. These
pins can be directly connected in any combination to VCC or GND, and by utilizing the
A2-0 pins, up to eight devices may be addressed on a single bus.
The A2-0 pins are internally pulled to GND and may be left floating. However, it is
highly recommended that the A2-0 pins always be directly connected to VCC or GND to
ensure a known address state.
VCC
Device Power Supply: The VCC pin is used to supply the source voltage to the device.
Operations at invalid VCC voltages may produce spurious results and should not be
attempted.
GND
Ground: The ground reference for the power supply. GND should be connected to the
system ground.
Atmel AT30TS75 [DATASHEET]
8748B–DTS–4/12
5
Figure 1.
Pin Configurations
8-SOIC
(Top View)
3.
8-MSOP
(Top View)
SDA
1
8
VCC
SCL
2
7
A0
ALERT
3
6
A1
GND
4
5
A2
SDA
SCL
ALERT
GND
1
2
3
4
8-UDFN
(Top View)
8
7
6
5
VCC
A0
A1
A2
SDA
SCL
ALERT
GND
1
2
3
4
8
7
6
5
VCC
A0
A1
A2
Block Diagram
Figure 3-1. Block Diagram
Pointer
Register
Configuration
Register
SDA
ALERT
TLOW Limit
Register
I2C/SMBus
Interface
Control
and
Logic
SCL
A2-0
THIGH Limit
Register
Temperature
Register
A/D
Converter
Temperature
Sensor
3
Digital
Comparator
Atmel AT30TS75 [DATASHEET]
8748B–DTS–4/12
6
4.
Device Communication
The AT30TS75 operates as a slave device and utilizes a simple 2-wire I2C and SMBus compatible digital serial interface
to communicate with a host controller, commonly referred to as the bus Master. The Master initiates and controls all
Read and Write operations to the slave devices on the serial bus, and both the Master and the slave devices can transmit
and receive data on the bus.
The serial interface is comprised of just two signal lines: Serial Clock (SCL) and Serial Data (SDA). The SCL pin is used
to receive the clock signal from the Master, while the bidirectional SDA pin is used to receive command and data
information from the Master as well as to send data back to the Master. Data is always latched into the AT30TS75 on the
rising edge of SCL and always output from the device on the falling edge of SCL. Both the SCL and SDA pin incorporate
integrated spike suppression filters and Schmitt Triggers to minimize the effects of input spikes and bus noise.
All command and data information is transferred with the Most-Significant Bit (MSB) first. During bus communication,
one data bit is transmitted every clock cycle, and after eight bits (one byte) of data has been transferred, the receiving
device must respond with either an acknowledge (ACK) or a no-acknowledge (NACK) response bit during a ninth clock
cycle (ACK/NACK clock cycle) generated by the Master. Therefore, nine clock cycles are required for every one byte of
data transferred. There are no unused clock cycles during any Read or Write operation, so there must not be any
interruptions or breaks in the data stream during each data byte transfer and ACK or NACK clock cycle.
During data transfers, data on the SDA pin must only change while SCL is low, and the data must remain stable while
SCL is high. If data on the SDA pin changes while SCL is high, then either a Start or a Stop condition will occur. Start
and Stop conditions are used to initiate and end all serial bus communication between the Master and the slave devices.
The number of data bytes transferred between a Start and a Stop condition is not limited and is determined by the
Master.
In order for the serial bus to be idle, both the SCL and SDA pins must be in the logic-high state at the same time.
4.1
Start Condition
A Start condition occurs when there is a high-to-low transition on the SDA pin while the SCL pin is stable in the logic-high
state. The Master uses a Start condition to initiate any data transfer sequence, and the Start condition must precede any
command. The AT30TS75 will continuously monitor the SDA and SCL pins for a Start condition, and the device will not
respond unless one is given.
4.2
Stop Condition
A Stop condition occurs when there is a low-to-high transition on the SDA pin while the SCL pin is stable in the logic-high
state. The Master uses the Stop condition to end a data transfer sequence to the AT30TS75 which will subsequently
return to the idle state. The Master can also utilize a repeated Start condition instead of a Stop condition to end the
current data transfer if the Master will perform another operation.
4.3
Acknowledge (ACK)
After every byte of data received, the AT30TS75 must acknowledge to the Master that it has successfully received the
data byte by responding with an ACK. This is accomplished by the Master first releasing the SDA line and providing the
ACK/NACK clock cycle (a ninth clock cycle for every byte). During the ACK/NACK clock cycle, the AT30TS75 must
output a Logic 0 (ACK) for the entire clock cycle such that the SDA line must be stable in the logic-low state during the
entire high period of the clock cycle.
Atmel AT30TS75 [DATASHEET]
8748B–DTS–4/12
7
4.4
No-Acknowledge (NACK)
When the AT30TS75 is transmitting data to the Master, the Master can indicate that it is done receiving data and wants
to end the operation by sending a NACK response to the AT30TS75 instead of an ACK response. This is accomplished
by the Master outputting a Logic 1 during the ACK/NACK clock cycle, at which point the AT30TS75 will release the SDA
line so that the Master can then generate a Stop condition.
In addition, the AT30TS75 can use a NACK to respond to the Master instead of an ACK for certain invalid operation
cases such as an attempt to write to a Read-only Register (e.g. an attempt to write to the Temperature Register).
Figure 4-1. Start, Stop, and ACK
SCK
Data
Must be
Stable
Data
Must be
Stable
Data
Must be
Stable
1
2
8
9
SDA
Start
Condition
Data
Change
Allowed
Data
Change
Allowed
Data
Change
Allowed
Data
Change
Allowed
ACK
Stop
Condition
Atmel AT30TS75 [DATASHEET]
8748B–DTS–4/12
8
5.
Device Operation
Commands used to configure and control the operation of the AT30TS75 are sent to the device from the Master via the
serial interface. Likewise, the Master can read the temperature data from the AT30TS75 via the serial interface.
However, since multiple slave devices can reside on the serial bus, each slave device must have its own unique 7-bit
address so that the Master can access each device independently.
For the AT30TS75, the first four MSBs of its 7-bit address are the device type identifier and are fixed at 1001. The
remaining three LSBs correspond to the states of the hard-wired A2-0 address pins.
Example:
If the A2-0 pins are connected to GND, then the 7-bit device address would be 1001000.
In order for the Master to select and access the AT30TS75, the Master must first initiate a Start condition. Following the
Start condition, the Master must output the device address byte. The device address byte consists of the 7-bit device
address plus a Read/Write (R/W) control bit, which indicates whether the Master will be performing a Read or a Write to
the AT30TS75. If the R/W control bit is a Logic 1, then the Master will be reading data from the AT30TS75. Alternatively,
if the R/W control bit is a Logic 0, then the Master will be writing data to the AT30TS75.
Table 5-1.
Atmel AT30TS75 Address Byte
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Device Type Identifier
1
0
Bit 2
Bit 1
Device Address
0
1
A2
A1
Bit 0
Read/Write
A0
R/W
If the 7-bit address sent by the Master matches that of the AT30TS75, then the device will respond with an ACK after it
has received the full address byte. If there is an address mismatch, then the AT30TS75 will respond with a NACK and
return to the idle state.
5.1
High-Speed Mode
The AT30TS75 supports the I2C High-Speed (HS) mode allowing it to operate at clock frequencies up to 3.4MHz. In
order to put the AT30TS75 into the HS mode, the Master must first initiate a Start condition followed by the HS mode
master code of 00001XXX. Since the HS mode master code is meant to be recognized by all slave devices that support
the HS mode, the AT30TS75 will not ACK the HS mode master code. Instead, the Master will output a NACK during the
ACK/NACK clock cycle.
Once the AT30TS75 receives the HS mode master code, it will switch its input filters on SDA and SCL to the HS mode to
allow transfers up to 3.4MHz. The device will then return to the idle state and wait for a repeated Start condition before
the next operation can occur.
To begin the next operation, the Master must issue a repeated Start condition followed by the device address byte. The
AT30TS75 will continue to operate in the HS mode until the Master sends a Stop condition; therefore, the Master should
use repeated Start conditions to begin new operations rather than a Stop-Start sequence. Once the AT30TS75 receives
a Stop condition, the device will switch its input and output filters back to the standard I2C mode.
Figure 5-1. High-Speed Mode
1
2
3
4
5
6
7
8
9
X
X
X
1
SCK
Master Code
SDA
0
0
0
0
1
MSB
Start
by
Master
NACK
from
Master
Repeated
Start
by
Master
Atmel AT30TS75 [DATASHEET]
8748B–DTS–4/12
9
5.2
Temperature Measurements
The AT30TS75 utilizes a band-gap type temperature sensor with an internal sigma-delta Analog-to-Digital Converter
(ADC) to measure and convert the temperature reading into a digital value with a selectable resolution as high as
0.0625C. The measured temperature is calibrated in degrees Celsius; therefore, a lookup table or conversion routine is
necessary for applications that wish to deal in degrees Fahrenheit.
The result of the digitized temperature measurements are stored in the internal Temperature Register of the AT30TS75,
which is readable at any time through the device's serial interface. When in the normal operating mode, the device
performs continuous temperature measurements and updates the contents of the Temperature Register (see Section 6.2
“Temperature Register” on page 16) after each analog-to-digital conversion.
The resolution of the temperature measurement data can be configured to 9, 10, 11, or 12 bits which corresponds to
temperature increments of 0.5C, 0.25C, 0.125C, and 0.0625C, respectively. Selecting the temperature resolution is
done using the R1 and R0 bits in the Configuration Register (see Section 6.3 “Configuration Register” on page 18). The
ADC conversion time does increase with each bit of higher resolution, so careful consideration should be given to the
resolution versus conversion time relationship. The default resolution after device power-up or reset is nine bits, which
retains backwards compatibility to industry-standard LM75-type devices.
With 12 bits of resolution, the AT30TS75 can theoretically measure a temperature range of 255C (-128C to +127C);
however, the device is only designed to measure temperatures over a range of -55C to +125C.
5.3
Temperature Alarm
After the measured temperature value has been stored into the Temperature Register, the data will be compared with
both the high and low temperature limits defined by the values stored in the THIGH Limit Register and TLOW Limit Register.
If the comparison results in a valid fault condition (see Section 5.3.1 “Fault Tolerance Limits” on page 10), then the device
will activate the ALERT output pin.
The polarity and function of the ALERT pin can be configured by using specific bits in the Configuration Register. The
ALERT pin defaults to the active low state after device power-up or reset but can be reconfigured to active high by setting
the POL bit in the Configuration Register to a Logic 1. The function of the ALERT pin changes based on the Alarm
Thermostat mode, which can be configured to either Comparator mode (see Section 5.3.2 “Comparator Mode” on page
11) or Interrupt mode (see Section 5.3.3 “Interrupt Mode” on page 12) by using the CMP/INT bit in the Configuration
Register. The Comparator mode is the default operating mode after the device powers up or resets.
The value of the high temperature limit stored in the THIGH Limit Register must be greater than the value of the low
temperature limit stored in the TLOW Limit Register in order for the ALERT function to work properly; otherwise, the
ALERT pin will output erroneous results and will falsely signal temperature alarms.
5.3.1
Fault Tolerance Limits
A temperature fault occurs if the measured temperature meets or exceeds either the high temperature limit set by the
THIGH Limit Register or the low temperature limit set by the TLOW Limit Register. To prevent false alarms due to
environmental or temperature noise, the device incorporates a fault tolerance queue that requires consecutive
temperature faults to occur before resulting in a valid fault condition. The fault tolerance queue value is controlled by the
FT1 and FT0 bits in the Configuration Register and can be set to a single fault count of 1 or a count of 2, 4, or 6
consecutive faults.
An internal counter that automatically increments after a temperature fault is used to determine if the fault tolerance
queue setting has been met. After incrementing the fault counter, the device will compare the count to the fault tolerance
queue setting to see if a valid fault condition should be triggered. Once a valid fault condition occurs, the device will
activate the ALERT output pin. If the most recent measured temperature does not meet or exceed the high or low
temperature limit, then the internal fault counter will be reset back to zero.
Figure 5-2 shows a sample temperature profile and how each temperature fault would impact the internal fault counter.
Atmel AT30TS75 [DATASHEET]
8748B–DTS–4/12
10
Figure 5-2. Fault Count Example
THIGH Limit
Temperature
TLOW Limit
Temperature Measurements/Conversions
5.3.2
Comparator Mode
When the device operates in the Comparator mode, then the ALERT pin goes active if the measured temperature meets
or exceeds the high temperature limit set by the THIGH Limit Register and a valid fault condition exists (the consecutive
number of temperature faults has been reached). The ALERT pin will return to the inactive state after the measured
temperature drops below the TLOW Limit Register value the appropriate number of times to create a subsequent valid
fault condition. The ALERT pin only changes state based on the high and low temperature limits and fault conditions;
reading from or writing to any register or putting the device into Shutdown mode will not affect the state of the ALERT pin.
The high temperature limit set by the THIGH Limit Register must be greater than the low temperature limit set by the TLOW
Limit Register in order for the ALERT pin to activate correctly.
If switching from Interrupt mode to Comparator mode while the ALERT pin is already active, then the ALERT pin will
remain active until the measured temperature is below the TLOW Limit Register value the appropriate number of times to
create a valid fault condition.
The ALERT pin will return to the inactive state if the device receives the General Call Reset command. In addition, the
state of the Configuration Register will return to the power-on default state, and the device will remain in the Comparator
mode.
Figure 5-3 illustrates both the active high and active low ALERT pin response for a sample temperature profile with the
device configured for the Comparator mode and a fault tolerance queue setting of two.
Figure 5-3. Comparator Mode (Fault Tolerance Queue = 2)
THIGH Limit
Temperature
TLOW Limit
ALERT
(Active High, POL = 1)
ALERT
(Active Low, POL = 0)
Temperature Measurements/Conversions
Atmel AT30TS75 [DATASHEET]
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5.3.3
Interrupt Mode
Similar to the Comparator mode, when the device operates in the Interrupt mode, the ALERT pin will go active if the
measured temperature meets or exceeds the high temperature limit set by the THIGH Limit Register and a valid fault
condition exists (the consecutive number of temperature faults has been reached). Unlike the Comparator mode,
however, the ALERT pin will remain active until one of three normal operation events takes place: any one of the
device's registers is read, the device responds to an SMBus Alert Response Address (ARA), or the device is put into
Shutdown mode.
Once the ALERT pin returns to the inactive state, it will not go active again until the measured temperature drops below
the low temperature limit set by the TLOW Limit Register for the appropriate number of consecutive faults. Again, the
ALERT pin will remain active until one of the device's registers is read, the device responds to an SMBus ARA, or the
device is placed into the Shutdown mode.
After the ALERT pin becomes inactive again, the cycle will repeat itself with the ALERT pin going active after the
measured temperature meets or exceeds the THIGH Limit Register value for the proper number of consecutive faults.
This process is cyclical between THIGH and TLOW temperature alarms (e.g. THIGH event, ALERT clear, TLOW event, ALERT
clear, THIGH event, ALERT clear, TLOW event, etc.).
In order for the ALERT pin to normally become active for the first time in the Interrupt Mode, the first event must be a
THIGH temperature alarm event. Therefore, even if the measured temperature initially starts off between the THIGH and
TLOW limits and then drops below the TLOW temperature limit and has met valid fault conditions, the ALERT pin will still not
go active. The high temperature limit set by the THIGH Limit Register must be greater than the low temperature limit set by
the TLOW Limit Register in order for the ALERT pin to activate correctly.
If switching from Comparator mode to Interrupt mode while the ALERT pin is already active, then the ALERT pin will
remain active until it is cleared by one of the events already detailed: any one of the device's registers is read, the device
responds to an SMBus ARA, or the device is put into Shutdown mode. The ALERT pin will also return to the inactive
state if the device receives the General Call Reset command. When reset, the state of the Configuration Register will
return to the power-on default state which will put the device back into the Comparator mode.
Figures 5-4 and Figure 5-5 show both the active high and active low ALERT pin response for a sample temperature
profile with the device configured for the Interrupt mode and a fault tolerance queue setting of two. Figure 5-5 illustrates
how the ALERT pin output would look if there was a longer delay between the ALERT trigger and the reading of a
register.
Figure 5-4. Interrupt Mode (Fault Tolerance Queue = 2)
THIGH Limit
Temperature
TLOW Limit
ALERT
(Active High, POL = 1)
Read Register
Read Register
Read Register
ALERT
(Active Low, POL = 0)
Temperature Measurements/Conversions
Atmel AT30TS75 [DATASHEET]
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12
Figure 5-5. Interrupt Mode (Fault Tolerance Queue = 2) Delay Before Reading Register
THIGH Limit
Temperature
TLOW Limit
ALERT
(Active High, POL = 1)
Read Register
Read Register
ALERT
(Active Low, POL = 0)
Temperature Measurements/Conversions
5.4
Shutdown Mode
To reduce current consumption and save power, the device features a Shutdown mode that disables all internal device
circuitry except for the serial interface and POR circuits. While in the Shutdown mode, the internal temperature sensor is
not active, so no temperature measurements will be made. Entering and exiting the Shutdown mode is controlled by the
SD bit in the Configuration Register.
Entering the Shutdown mode can affect the ALERT pin depending on the Alarm Thermostat mode. If the device is
configured to operate in the Interrupt mode, then the ALERT pin will go inactive when the device enters the Shutdown
mode. However, the ALERT pin will not change states if the device is operating in the Comparator mode.
The fault count information will not change when the device enters or exits the Shutdown mode. Therefore, the number
of previous temperature faults recorded by the internal fault counter will be retained unless the device is power-cycled or
reset. When exiting the Shutdown mode, the ALERT pin will go active if operating in Interrupt mode, a valid fault
condition exists, and the THIGH and TLOW event cycles are maintained (i.e. THIGH event before entering Shutdown mode
followed by a TLOW event when exiting Shutdown mode).
5.4.1
One-shot Mode
The AT30TS75 features a One-shot Temperature mode that allows the device to perform a single temperature
measurement while in the Shutdown mode. By keeping the device in the Shutdown mode and utilizing the One-shot
mode, the AT30TS75 can remain in a lower power state and only go active to take temperature measurements on an
as-needed basis. The internal fault counter will be updated when taking a temperature measurement using the One-shot
mode; therefore, a valid fault condition can be generated by the One-shot temperature measurements. If operating in
Comparator mode, then the fault condition will cause the ALERT pin to go either active or inactive depending on if the
fault condition is a result of a THIGH or TLOW event. If operating in Interrupt mode, the fault condition will cause the ALERT
pin to pulse active for a short duration of time to indicate a THIGH or TLOW event has occurred. The ALERT pin will then
return to the inactive state.
The One-shot mode is controlled using the OS bit in the Configuration Register (see Section 6.3.1 “OS Bit” on page 19).
Atmel AT30TS75 [DATASHEET]
8748B–DTS–4/12
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6.
Registers
The AT30TS75 contains five registers (a Pointer Register and four data registers) that are used to control the operational
mode and performance of the temperature sensor, store the user-defined high and low temperature limits, and store the
digitized temperature measurements. All accesses to the device are performed using these five registers. In order to
read from and write to one of the device's four data registers, the user must first select a desired data register by utilizing
the Pointer Register.
Table 6-1.
Registers
Register
Address
Read/Write
Size
Power-on Default
Pointer Register
n/a
W
8-bit
00h
Temperature Register
00h
R
16-bit
0000h
Configuration Register
01h
R/W
16-bit
0000h
TLOW Limit Register
02h
R/W
16-bit
4B00h (75C)
THIGH Limit Register
03h
R/W
16-bit
5000h (80C)
The Configuration Register, despite being 16-bits wide, is compatible to industry standard LM75-type temperature
sensors that use an 8-bit wide register in that only the first 8-bits of the Configuration Register need to be written to or
read from.
6.1
Pointer Register
The 8-bit Write-only Pointer Register is used to address and select which one of the device's four data registers
(Temperature Register, Configuration Register, TLOW Limit Register, or THIGH Limit Register) will be read from or written
to.
For Read operations from the AT30TS75, once the Pointer Register is set to point to a particular data register, it remains
pointed to that same data register until the Pointer Register value is changed.
Example:
If the user sets the Pointer Register to point to the Temperature Register, then all subsequent reads from
the device will output data from the Temperature Register until the Pointer Register value is changed.
For Write operations to the AT30TS75, the Pointer Register value must be refreshed each time a Write to the device is to
be performed, even if the same data register is going to be written to a second time in a row.
Example:
If the Pointer Register is set to point to the Configuration Register, once the subsequent Write operation to
the Configuration Register has completed, the user cannot write again into the Configuration Register
without first setting the Pointer Register value again. As long as a Write operation is to be performed, the
device will assume that the Pointer Register value is the first data byte received after the address byte.
Since only four data registers are available for access, only the two LSBs (P1 and P0) of the Pointer Register are used;
the remaining six bits (P7-P2) of the Pointer Register should always be set to zero to allow for future migration paths to
other temperature sensor devices that have more than four data registers. Table 6-2 shows the bit assignments of the
Pointer Register and the associated pointer addresses of the data registers available. Attempts to write any values other
than those listed in Table 6-2 into the Pointer Register will be ignored by the device, and the contents of the Pointer
Register will not be changed. However, the device will respond back to the Master with an ACK to indicate that the
device successfully received a data byte even though no operation will be performed.
Atmel AT30TS75 [DATASHEET]
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Table 6-2.
Pointer Register and Address Assignments
Pointer Register Value
P7
P6
P5
P4
P3
P2
P1
P0
Associated
Address
0
0
0
0
0
0
0
0
00h
Temperature Register
0
0
0
0
0
0
0
1
01h
Configuration Register
0
0
0
0
0
0
1
0
02h
TLOW Limit Register
0
0
0
0
0
0
1
1
03h
THIGH Limit Register
Register Selected
To set the value of the Pointer Register, the Master must first initiate a Start condition followed by the AT30TS75's device
address byte (1001AAA0 where "AAA" corresponds to the hard-wired A2-0 address pins). After the AT30TS75 has
received the proper address byte, the device will send an ACK to the Master. The Master must then send the
appropriate data byte to the AT30TS75 to set the value of the Pointer Register.
After device power-up or reset, the Pointer Register defaults to 00h which is the Temperature Register location;
therefore, the Temperature Register can be read from immediately after device power-up or reset without having to set
the Pointer Register.
Figure 6-1. Write Pointer Register
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
P1
P0
0
SCK
Address Byte
SDA
1
0
0
1
A
Pointer Register Byte
A
A
0
0
MSB
Start
by
Master
P7
P6
P5
P4
P3
P2
MSB
ACK
from
Slave
ACK
from
Slave
Stop
by
Master
Atmel AT30TS75 [DATASHEET]
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6.2
Temperature Register
The Temperature Register is a 16-bit Read-only Register that stores the digitized value of the most recent temperature
measurement. The temperature data value is represented in the twos complement format, and, depending on the
resolution selected, up to 12 bits of data will be available for output with the remaining LSBs being fixed in the Logic 0
state. The Temperature Register can be read at any time, and since temperature measurements are performed in the
background, reading the Temperature Register does not affect any other operation that may be in progress.
The MSB (bit 15) of the Temperature Register contains the sign bit of the measured temperature value with a zero
indicating a positive number and a one indicating a negative number. The remaining MSBs of the Temperature Register
contain the temperature value in the twos complement format. Table 6-3 details the Temperature Register format for the
different selectable resolutions, and Table 6-4 shows some examples for 12-bit resolution Temperature Register data
values and the associated temperature readings.
Table 6-3.
Temperature Register Format
Upper Byte
Lower Byte
Resolution
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
Bit 8
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
12 bits
Sign
TD
TD
TD
TD
TD
TD
TD
TD
TD
TD
TD
0
0
0
0
11 bits
Sign
TD
TD
TD
TD
TD
TD
TD
TD
TD
TD
0
0
0
0
0
10 bits
Sign
TD
TD
TD
TD
TD
TD
TD
TD
TD
0
0
0
0
0
0
9 bits
Sign
TD
TD
TD
TD
TD
TD
TD
TD
0
0
0
0
0
0
0
Note:
TD = Temperature Data
Table 6-4.
12-bit Resolution Temperature Data/Values Examples
Temperature Register Data
Temperature
Binary Value
Hex Value
+125°C
0111 1101 0000 0000
7D00h
+100°C
0110 0100 0000 0000
6400h
+75°C
0100 1011 0000 0000
4B00h
+50.5°C
0011 0010 1000 0000
3200h
+25.25°C
0001 1001 0100 0000
1940h
+10.125°C
0000 1010 0010 0000
0A20h
+0.0625°C
0000 0000 0001 0000
0010h
0°C
0000 0000 0000 0000
0000h
-0.0625°C
1111 1111 1111 0000
FFF0h
-10.125°C
1111 0101 1110 0000
F5E0h
-25.25°C
1110 0111 1100 0000
E7C0h
-50.5°C
1100 1110 1000 0000
CE80h
-55°C
1100 1001 0000 0000
C900h
Atmel AT30TS75 [DATASHEET]
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After each temperature measurement and digital conversion is complete, the new temperature data is loaded into the
Temperature Register if the register is not currently being read. If a Read is in progress, then the previous temperature
data will be output.
In order to read the most recent temperature measurement data, the Pointer Register must be set or have been
previously set to 00h. If the Pointer Register has already been set to 00h, the Temperature Register can be read by
having the Master first initiate a Start condition followed by the AT30TS75 device address byte (1001AAA1 where "AAA"
corresponds to the hard-wired A2-0 address pins). After the AT30TS75 has received the proper address byte, the device
will send an ACK to the Master. The Master can then read the upper byte of the Temperature Register. After the upper
byte of the Temperature Register has been clocked out of the AT30TS75, the Master must send an ACK to indicate that
it is ready for the lower byte of the temperature data. The AT30TS75 will then clock out the lower byte of the
Temperature Register, after which the Master must send a NACK to end the operation. When the AT30TS75 receives
the NACK, it will release the SDA line so that the Master can send a Stop or repeated Start condition. If the Master does
not send a NACK but instead sends an ACK after the lower byte of the Temperature Register has been clocked out, then
the device will repeat the sequence by outputting new temperature data starting with the upper byte of the Temperature
Register.
If 8-bit temperature resolution is satisfactory, then the lower byte of the Temperature Register does not need to be read.
In this case, the Master would send a NACK instead of an ACK after the upper byte of the Temperature Register has
been clocked out of the AT30TS75. When the AT30TS75 receives the NACK, the device will know that it should not
send out the lower byte of the Temperature Register and will instead release the SDA line so the Master can send a Stop
or repeated Start condition.
The Temperature Register defaults to 0000h after device power-up or reset; therefore, the system should wait the
maximum conversion time (tCONV) for the selected resolution before attempting to read valid temperature data. Since the
Temperature Register is a Read-only register, any attempts to write to the register will be ignored, and the device will
subsequently respond by sending a NACK back to the Master.
Figure 6-2. Read Temperature Register – 16 Bits
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
D0
1
SCK
Address Byte
SDA
1
0
0
1
A
Temperature Register Upper Byte
A
A
1
0
MSB
D8
0
MSB
Start
by
Master
Note:
D15 D14 D13 D12 D11 D10 D9
Temperature Register Lower Byte
D7
D6
D5
D4
D3
D2
D1
MSB
ACK
from
Slave
NACK
from
Master
ACK
from
Master
Stop
by
Master
Assumes the Pointer Register was previously set to point to the Temperature Register.
Figure 6-3. Read Temperature Register – 8 Bits
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
D8
1
SCK
Address Byte
SDA
1
0
0
1
A
Temperature Register Upper Byte
A
A
1
0
MSB
Start
by
Master
Note:
D15 D14 D13 D12 D11 D10 D9
MSB
ACK
from
Slave
NACK
from
Master
Stop
by
Master
Assumes the Pointer Register was previously set to point to the Temperature Register.
Atmel AT30TS75 [DATASHEET]
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6.3
Configuration Register
The Configuration Register is used to control key operational modes and settings of the device such as the One-shot
mode, the temperature conversion resolution, the fault tolerance queue, the ALERT pin polarity, the Alarm Thermostat
mode, and the Shutdown mode. The Configuration Register is a 16-bit wide Read/Write register; however, only the first
8-bits of the register are actually used while the least-significant 8-bits are reserved for future use to provide an upward
migration path to other temperature sensor devices that have enhanced features. Since only the most-significant 8-bits
of the Configuration Register are used, the device is backwards compatible to industry standard LM75-type temperature
sensors that use 8-bit wide registers.
After device power-up or reset, the Configuration Register defaults to 0000h; therefore, the system should update the
Configuration Register with the desired settings prior to attempting to read the Temperature Register unless the default
Configuration Register settings are satisfactory for the application.
Table 6-5.
Configuration Register
Bit
Name
15
OS
14:13
12:11
R1:R0
FT1:FT0
Type
One-shot Mode
Conversion Resolution
Fault Tolerance Queue
R/W
R/W
R/W
10
POL
ALERT Pin Polarity
R/W
9
CMP/INT
Alarm Thermostat Mode
R/W
8
SD
Shutdown Mode
R/W
7:0
RFU
Reserved for Future Use
R
Description
0
Normal Operation (Default)
1
Perform One-shot Measurement (Valid in Shutdown Mode Only)
00
9-bits (Default)
01
10-bits
10
11-bits
11
12-bits
00
Alarm after 1 Fault (Default)
01
Alarm after 2 Consecutive Faults
10
Alarm after 4 Consecutive Faults
11
Alarm after 6 Consecutive Faults
0
ALERT pin is Active Low (Default)
1
ALERT pin is Active High
0
Comparator Mode (Default)
1
Interrupt Mode
0
Temperature Sensor Performing Active Measurements (Default)
1
Temperature Sensor Disabled and Device In Shutdown Mode
0
Reserved for Future Use
To set the value of the Configuration Register, the Master must first initiate a Start condition followed by the AT30TS75's
device address byte (1001AAA0 where "AAA" corresponds to the hard-wired A2-0 address pins). After the AT30TS75
has received the proper address byte, the device will send an ACK to the Master. The Master must then send the
appropriate Pointer Register byte of 01h to select the Configuration Register. After the Pointer Register byte of 01h has
been sent, the AT30TS75 will send another ACK to the Master. After receiving the ACK from the AT30TS75, the Master
must then send the appropriate data byte to the AT30TS75 to set the value of the Configuration Register. Only the first
data byte sent to the AT30TS75 will be recognized as valid data; any subsequent bytes received by the device will simply
be ignored. If the Master does not send a complete byte of Configuration Register data prior to issuing a Stop or
repeated Start condition, then the AT30TS75 will ignore the data and the contents of the Configuration Register will be
unchanged.
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6.3.1
OS Bit
The OS bit is used to enable the One-shot Temperature Measurement mode. When a Logic 1 is written to the OS bit
while the AT30TS75 is in the Shutdown mode, the device will become active and perform a single temperature
measurement and conversion. After the Temperature Register has been updated with the measured temperature data,
the device will return to the low-power Shutdown mode and clear the OS bit.
Writing a one to the OS bit when the device is not in the Shutdown mode will have no affect. When reading the
Configuration Register, the OS bit will always be read as a Logic 0.
6.3.2
R1:R0 Bits
The R1 and R0 bits are used to select the conversion resolution of the internal sigma-delta ADC. Four possible
resolutions can be set to maximize for either higher resolution or faster conversion times. The R1 and R0 bits default to
the Logic 0 state after device power-up or reset to retain backwards compatibility to industry-standard LM75-type
devices.
Table 6-6.
6.3.3
Conversion Resolution
R1
R0
Conversion Resolution
Conversion Time
0
0
9 bits
0.5°C
25ms
0
1
10 bits
0.25°C
50ms
1
0
11 bits
0.125°C
100ms
1
1
12 bits
0.0625°C
200ms
FT1:FT0 Bits
The FT1 and FT0 bits are used to set the fault tolerance queue value which defines how many consecutive faults must
occur before the ALERT pin will be activated (see Section 5.3.1 “Fault Tolerance Limits” on page 10). The FT1 and FT0
bit settings provide four different fault values as detailed in Table 6-7. After the device powers up or resets, both the FT1
and FT0 bits will default to the Logic 0 state.
Table 6-7.
6.3.4
Fault Tolerance Queue
NVFT1
NVFT0
Consecutive Faults Required
0
0
1
0
1
2
1
0
4
1
1
6
POL Bit
The ALERT pin polarity is controlled by the POL bit. When the POL bit is in the Logic 0 state, the ALERT pin will be an
active low output (the default setting after device power-up or reset). To configure the ALERT pin as an active high
output, the POL bit must be set to the Logic 1 state.
Atmel AT30TS75 [DATASHEET]
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6.3.5
CMP/INT Bit
The CMP/INT bit controls whether the device will operate in the Comparator mode or the Interrupt mode. Setting the
CMP/INT bit to the Logic 0 state will put the device into the Comparator mode (default after device power-up or reset).
Alternatively, when the CMP/INT bit is set to the Logic 1 state, then the device will operate in the Interrupt mode. The
function of the ALERT pin changes based on the CMP/INT bit setting.
6.3.6
SD Bit
The SD bit is used to enable or disable the device's Shutdown mode. When the SD bit is in the Logic 0 state (default
after device power-up or reset), the device will be in the normal operational mode and perform continuous temperature
measurements and conversions. When the SD bit is set to the Logic 1 state, the device will finish the current
temperature measurement and conversion and will store the result in the Temperature Register, after which the device
will then enter the Shutdown mode.
Resetting the SD bit back to a Logic 0 will return the device to the normal operating mode.
Figure 6-4. Write to Configuration Register
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
D8
0
SCK
Address Byte
SDA
1
0
0
1
A
Pointer Register Byte
A
A
0
0
MSB
0
0
0
0
0
0
Configuration Register Upper Byte
0
1
0
MSB
Start
by
Master
D15 D14 D13 D12 D11 D10 D9
MSB
ACK
from
Slave
ACK
from
Slave
ACK
from
Slave
Stop
by
Master
Figure 6-5. Read from Configuration Register
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
D8
1
SCK
Configuration Register Upper Byte
Address Byte
SDA
1
0
0
1
A
A
A
1
0
MSB
Start
by
Master
Note:
D15 D14 D13 D12 D11 D10 D9
MSB
ACK
from
Slave
NACK
from
Master
Stop
by
Master
Assumes the Pointer Register was previously set to point to the Configuration Register.
Atmel AT30TS75 [DATASHEET]
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6.4
TLOW and THIGH Limit Registers
The 16-bit TLOW and THIGH Limit Registers store the user-programmable lower and upper temperature limits for the
temperature alarm. Like the Temperature Register, the temperature data values of the TLOW and THIGH Limit Registers
are stored in the twos complement format with the MSB (bit 15) of the registers containing the sign bit (zero indicates a
positive number and a one indicates a negative number).
As with the Temperature Register, the resolution selected by the R1 and R0 bits of the Configuration Register will
determine how many bits of the TLOW and THIGH Limit Registers will be used. Therefore, when writing to the TLOW and
THIGH Limit Registers, up to 12 bits of data will be recognized by the device with the remaining LSBs being internally fixed
to the Logic 0 state. Similarly, when reading from the registers, up to 12 bits of data will be output from the device with
the remaining LSBs fixed in the Logic 0 state.
Table 6-8.
TLOW Limit Register and THIGH Limit Register Format
Upper Byte
Lower Byte
Resolution
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
Bit 8
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
12 bits
Sign
TD
TD
TD
TD
TD
TD
TD
TD
TD
TD
TD
0
0
0
0
11 bits
Sign
TD
TD
TD
TD
TD
TD
TD
TD
TD
TD
0
0
0
0
0
10 bits
Sign
TD
TD
TD
TD
TD
TD
TD
TD
TD
0
0
0
0
0
0
9 bits
Sign
TD
TD
TD
TD
TD
TD
TD
TD
0
0
0
0
0
0
0
Note:
TD = Temperature Data
To set the value of either the TLOW or THIGH Limit Register, the Master must first initiate a Start condition followed by the
AT30TS75 device address byte (1001AAA0 where "AAA" corresponds to the hard-wired A2-0 address pins). After the
AT30TS75 has received the proper address byte, the device will send an ACK to the Master. The Master must then send
the appropriate Pointer Register byte of 02h to select the TLOW Limit Register or 03h to select the THIGH Limit Register.
After the Pointer Register byte has been sent, the AT30TS75 will send another ACK to the Master. After receiving the
ACK from the AT30TS75, the Master must then send two data bytes to the AT30TS75 to set the value of the TLOW or
THIGH Limit Register. Any subsequent bytes sent to the AT30TS75 will simply be ignored by the device. If the Master
does not send two complete bytes of data prior to issuing a Stop or repeated Start condition, then the AT30TS75 will
ignore the data and the contents of the register will not be changed.
In order to read the TLOW or THIGH Limit Register, the Pointer Register must be set or have been previously set to 02h to
select the TLOW Limit Register or 03h to select the THIGH Limit Register (if the previous operation was a Write to one of the
registers, then the Pointer Register will already be set for that particular limit register). If the Pointer Register has already
been set appropriately, the TLOW or THIGH Limit Register can be read by having the Master first initiate a Start condition
followed by the AT30TS75 device address byte (1001AAA1 where "AAA" corresponds to the hard-wired A2-0 address
pins). After the AT30TS75 has received the proper address byte, the device will send an ACK to the Master. The Master
can then read the upper byte of the TLOW or THIGH Limit Register. After the upper byte of the register has been clocked
out of the AT30TS75, the Master must send an ACK to indicate that it is ready for the lower byte of data. The AT30TS75
will then clock out the lower byte of the register, after which the Master must send a NACK to end the operation. When
the AT30TS75 receives the NACK, it will release the SDA line so that the Master can send a Stop or repeated Start
condition. If the Master does not send a NACK but instead sends an ACK after the lower byte of the register has been
clocked out, then the device will repeat the sequence by outputting the data again starting with the upper byte of the
register.
Atmel AT30TS75 [DATASHEET]
8748B–DTS–4/12
21
The TLOW Limit Register defaults to 4B00h (+75°C) and the THIGH Limit Register defaults to 5000h (+80°C) after the
device powers up or resets; therefore, both registers will need to be modified after power-up/reset if these default
temperature limits are not satisfactory for the application. The value of the high temperature limit stored in the THIGH Limit
Register must be greater than the value of the low temperature limit stored in the TLOW Limit Register in order for the
ALERT function to work properly; otherwise, the ALERT pin will output erroneous results and will falsely signal
temperature alarms. In addition, changing either value of the THIGH or TLOW Limit Register will cause the internal fault
counter to reset back to zero.
Figure 6-6. Write to TLOW or THIGH Limit Register
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
P1
P0
0
SCK
Address Byte
SDA
1
0
0
1
A
Pointer Register Byte
A
A
0
0
MSB
0
0
0
0
0
0
MSB
Start
by
Master
ACK
from
Slave
ACK
from
Slave
1
2
3
4
5
6
7
8
9
1
TLOW or THIGH Limit Register
Upper Byte
D15 D14 D13 D12 D11 D10
D9
2
3
4
5
6
7
8
9
D0
0
TLOW or THIGH Limit Register
Lower Byte
D8
0
D7
MSB
D6
D5
D4
D3
D2
D1
MSB
ACK
from
Slave
Stop
by
Master
ACK
from
Slave
Figure 6-7. Read from TLOW or THIGH Limit Register
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
D0
1
SCK
TLOW or THIGH Limit Register
Upper Byte
Address Byte
SDA
1
0
0
1
A
A
A
1
0
MSB
Start
by
Master
Note:
D15 D14 D13 D12 D11 D10 D9
TLOW or THIGH Limit Register
Lower Byte
D8
0
MSB
ACK
from
Slave
D7
D6
D5
D4
D3
D2
D1
MSB
ACK
from
Master
NACK
from
Master
Stop
by
Master
Assumes the Pointer Register was previously set to point to the TLOW or THIGH Limit Register.
Atmel AT30TS75 [DATASHEET]
8748B–DTS–4/12
22
7.
SMBus Features and I2C General Call
7.1
SMBus Alert
The AT30TS75 utilizes the ALERT pin to support the SMBus Alert function when the Alarm Thermostat mode is set to the
Interrupt mode (the CMP/INT bit of the Configuration Register is set to one) and the ALERT pin polarity is set to active
low (the POL bit of the Configuration Register is set to zero). The AT30TS75 is a slave-only device, and normally, slave
devices on the SMBus cannot signal to the Master that they want to communicate. However, the AT30TS75 uses the
SMBus Alert function (the ALERT pin) to signal to the Master that it wants to communicate.
Several SMBus Alert pins from different slave devices can be connected to a common SMBus Alert input on the Master.
When the SMBus Alert input on the Master is pulled low by one of the slave devices, the Master can perform a
specialized Read operation from the slave devices to determine which device sent the SMBus Alert signal.
The specialized Read operation is known as an SMBus ARA and requires that the Master first initiate a Start condition
followed by the SMBus ARA code of 00011001. The slave device that generated the SMBus Alert signal will respond to
the Master with an ACK. After sending the ACK, the slave device will then output its own device address (1001AAA for
the AT30TS75 where "AAA" corresponds to the hard-wired A2-0 address pins) on the bus. Since the device address is
seven bits long, the remaining eighth bit (the LSB) is used as an indicator to notify the Master which temperature limit
caused the alarm (the LSB will be a Logic 1 if the THIGH limit was met or exceeded, and the LSB will be a Logic 0 if the
TLOW limit was exceeded).
The SMBus ARA can activate several slave devices at the same time; therefore, if more than one slave responds,
standard SMBus arbitration rules apply and the device with the lowest address wins the arbitration. The device winning
the arbitration will clear its SMBus Alert output after it has responded to the SMBus ARA and provided its device address.
All other devices with higher addresses do not generate an ACK and continue to hold their SMBus Alert outputs low until
cleared. The Master will continue to issue SMBus ARA sequences until all slave devices that generated an SMBus Alert
signal have responded and cleared their SMBus Alert outputs.
Figure 7-1. SMBus Alert
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
SCK
SMBus ARA Code
SDA
0
0
0
1
1
0
AT30TS75 Device Address Byte
0
1
0
MSB
Start
by
Master
Note:
1
0
0
1
A2
A1
A0 Limit
1
MSB
ACK
from
Slave
NACK
from
Master
Stop
by
Master
The "Limit" bit (the LSB) of the device address byte will be "1" or "0" depending on if the THIGH or TLOW limit
was exceeded.
Atmel AT30TS75 [DATASHEET]
8748B–DTS–4/12
23
7.2
SMBus Timeout
The AT30TS75 supports the SMBus Timeout feature in which the AT30TS75 will reset its serial interface and release the
SMBus (stop driving the bus and let SDA float high) if the SCL pin is held low for more than the minimum tTIMEOUT
specification. The AT30TS75 will be ready to accept a new Start condition before tTIMEOUT maximum has elapsed.
Figure 7-2. SMBus Timeout
tTIMEOUT (MAX)
tTIMEOUT (MIN)
SCL
Device will release Bus and
be ready to accept a new
Start Condition within this Time
7.3
General Call
The AT30TS75 will respond to an I2C general call address (0000000) from the Master only if the eighth bit (the LSB) of
the general call address byte is zero. If the general call address byte is 00000000, then the device will send an ACK to
the Master and await a command byte from the Master.
If the Master sends a command byte of 04h, then the AT30TS75 will re-latch the status of its address pins in case the
system has assigned a new address to the device. If the Master sends a command byte of 06h (General Call Reset),
then the AT30TS75 will re-latch the status of its address pins and perform a reset sequence. The reset sequence will
reset all registers to their power-up defaults, and the device will be busy for a maximum time of tPOR during the Reset
operation.
Atmel AT30TS75 [DATASHEET]
8748B–DTS–4/12
24
8.
Electrical Specifications
8.1
Absolute Maximum Ratings*
Temperature under Bias . . . . . . . . . . . . . -55°C to +125°C
Storage Temperature . . . . . . . . . . . . . . . -65°C to +150°C
Supply voltage
with respect to ground . . . . . . . . . . . . . . . . -0.5V to +7.0V
All other input voltages (including NC pins)
with respect to ground . . . . . . . . . . . . -0.5V to VCC + 0.5V
All output voltages
with respect to ground . . . . . . . . . . . . -0.5V to VCC + 0.5V
8.2
*Notice: Stresses beyond those listed under "Absolute
Maximum Ratings" may cause permanent damage
to the device. Functional operation of the device at
these ratings or any other conditions beyond those
indicated in the operational sections of this
specification is not implied. Exposure to absolute
maximum rating conditions for extended periods
may affect device reliability. Voltage extremes
referenced in the "Absolute Maximum Ratings" are
intended to accommodate short duration
undershoot/overshoot conditions and does not
imply or guarantee functional device operation at
these levels for any extended period of time.
DC and AC Operating Range
Atmel AT30TS75
Operating Temperature (Case)
Industrial High Temperature
-55C to +125C(1)(2)
VCC Power Supply
Notes: 1.
2.
2.7V to 5.5V
Device operation is guaranteed from -40°C to +125°C.
Device operation is not guaranteed at -55°C but ensured by characterization.
Atmel AT30TS75 [DATASHEET]
8748B–DTS–4/12
25
8.3
DC Characteristics
Symbol
ICC
Parameter
Active Current
ISD
Shutdown Mode Current
Typ(1)
Max
Active Temperature Conversions,
Bus Inactive, VCC = 3.3V
75
100
Active Temperature Conversions,
Bus Inactive, VCC = Max
100
150
Active Temperature Conversions,
fSCL = 400KHz, VCC = 3.3V
125
175
Active Temperature Conversions,
fSCL = 400KHz, VCC = Max
180
230
Active Temperature Conversions,
fSCL = 3.4MHz, VCC = 3.3V
350
650
Active Temperature Conversions,
fSCL = 3.4MHz, VCC = Max
400
750
Bus Inactive, VCC = 3.3V
0.6
1.5
Bus Inactive, VCC = Max
1.1
3.0
fSCL = 400KHz, VCC = 3.3V
115
165
fSCL = 400KHz, VCC = Max
170
220
fSCL = 3.4MHz, VCC = 3.3V
310
600
fSCL = 3.4MHz, VCC = Max
360
700
Condition
Min
Unit
s
μA
μA
ILI
Input Leakage Current
VIN = CMOS Levels
±1
μA
ILO
Output Leakage Current
VOUT = CMOS Levels
±1
μA
VIL
Input Low Voltage
0.3 x VCC
V
VIH
Input High Voltage
VOL1
Output Low Voltage
IOL = 3mA
0.4
V
VOL2
Output Low Voltage, ALERT Pin
IOL = 4mA
0.4
V
VOH
Output High Voltage
IOH = -100μA
Note:
1.
0.7 x VCC
V
VCC - 0.2
V
Typical values characterized at TA = +25°C unless otherwise noted.
Atmel AT30TS75 [DATASHEET]
8748B–DTS–4/12
26
8.4
Temperature Sensor Accuracy and Conversion Characteristics
Symbol
TACC
Sensor Accuracy
TRES
Conversion Resolution
tCONV
Conversion Time
Notes: 1.
2.
8.5
Parameter
Typ(1)
Max
TA = 0°C to +85°C
±0.5
±1.0
TA = -20°C to +105°C
±1.0
±2.0
TA = -40°C to +125°C
±2.0
±3.0
TA = -55°C to +125°C(2)
±3.0
Condition
Selectable 9 to 12 bits
Min
0.5 (9 bits)
Units
C
0.0625 (12 bits)
9-bit Resolution
25
37.5
10-bit Resolution
50
75
11-bit Resolution
100
150
12-bit Resolution
200
300
C
ms
Typical values characterized at VCC = 3.3V, TA = +25°C unless otherwise noted.
Sensor accuracy characterized to this range but not tested or guaranteed.
AC Characteristics
Fast Mode
High-Speed Mode
Symbol
Parameter
Min
Max
Min
Max
Units
fSCL
Serial Clock Frequency
1(1)
400
1(1)
3400
KHz
tSCLH
Clock High Time
600
ns
tSCLL
Clock Low Time
1300
ns
tR
Clock/Data Input Rise Time
300
100
ns
tF
Clock/Data Input Fall Time
300
100
ns
tSUDAT
Data In Setup Time
50
10
ns
tHDDAT
Data In Hold Time
0
0
ns
tV
Output Valid Time
tOH
Output Hold Time
tBUF
450
50
ns
0
0
ns
Bus Free Time Between Stop and Start Condition
600
160
ns
tSUSTA
Repeated Start Condition Setup Time (SCL High to SDA Low)
50
50
ns
tHDSTA
Start Condition Hold Time (SDA Low to SCL Low)
50
50
ns
tSUSTO
Stop Condition Setup Time (SCL High to SDA High)
50
50
ns
tNS
Noise Suppression Input Filter Time
tTIMEOUT
SMBus Timeout Time
CLOAD
Capacitive Load for SCL and SDA Lines
Note:
1.
50
25
75
400
25
10
ns
75
ms
100
pF
Minimum clock frequency must be at least 1KHz to avoid activating the SMBus Timeout feature.
Atmel AT30TS75 [DATASHEET]
8748B–DTS–4/12
27
Figure 8-1. SMBus/I2C Timing Diagram
tSCKH
tR
tSCKL
tF
SCL
tOH
tSUDAT
tSUSTO
tSUSTA
tBUF
tV
SDA
IN
IN
OUT
OUT
IN
Start
Condition
8.6
tHDSTA
tHDDAT
Stop
Condition
IN
Start
Condition
Repeated Start
Condition
Power-up Conditions
Symbol
Parameter
tPOR
Power-on Reset Time
VPOR
Power-on Reset Voltage Range
Min
1.7
Max
Units
500
μs
2.3
V
Figure 8-2. Power-up Timing
VCC
Device Access Permitted
VCC (min)
tPOR
VPOR (max)
VPOR (min)
Do Not Attempt
Device Access
During this Time
Time
Atmel AT30TS75 [DATASHEET]
8748B–DTS–4/12
28
8.7
Pin Capacitance
Symbol
Parameter
CI/O(1)
(1)
CIN
Note:
8.8
1.
Min
Max
Units
Input/Output Capacitance (SDA and ALERT pins)
VI/O = 0V
8
pF
Input Capacitance (A2-0 and SCL pins)
VIN= 0V
6
pF
Not 100% tested (value guaranteed by design and characterization).
Input Test Waveforms and Measurement Levels
AC
Input
Levels
0.9VCC
VCC
2
AC
Measurement
Level
0.1VCC
tR, tF < 5ns (10% to 90%)
8.9
Output Test Load
Device
Under
Test
100pF
Atmel AT30TS75 [DATASHEET]
8748B–DTS–4/12
29
9.
Ordering Information
9.1
Atmel Ordering Code Detail
AT 3 0 T S 7 5 - S S 8 - B
Atmel Designator
Shipping Carrier Option
B = Bulk (tubes)
T = Tape and reel
Product Family
Device Grade
30TS = Digital Temperature Sensor
8 = Green, NiPdAu lead finish,
Industrial high temperature range
(–40°C to +125°C) Accuracy guaranteed
Device Type
Package Option
SS = 8-lead, 0.150" wide SOIC
XM = 8-lead, 3 x 3mm MSOP
MA = 8-pad, 2 x 3 x 0.6mm
9.2
Green Package Options (Pb/Halide-free/RoHS Compliant)
Atmel Ordering Code
AT30TS75-SS8-B
AT30TS75-SS8-T
AT30TS75-XM8-B
AT30TS75-XM8-T
AT30TS75-MA8-T
Note:
Package
Lead (Pad)
Finish
Operating
Voltage
Max. Freq.
(KHz)
NiPdAu
2.7V to 5.5V
3400
Operation Range
8S1
8XM
Industrial High Temperature
(-55°C to +125°C)
8MA2
The shipping carrier option code is not marked on the devices.
Package Type
8S1
8-lead, 0.150" wide, Plastic Gull Wing Small Outline (JEDEC SOIC)
8XM
8-lead, 3 x 3 mm, Plastic Miniature Small Outline (MSOP)
8MA2
8-pad, 2 x 3 x 0.6 mm, Thermally Enhanced Plastic Ultra Thin Dual Flat No Lead (UDFN)
Atmel AT30TS75 [DATASHEET]
8748B–DTS–4/12
30
10.
Part Marking Detail
Atmel AT30TS75 [DATASHEET]
8748B–DTS–4/12
31
11.
Packaging Information
11.1
8S1 - JEDEC SOIC
C
1
E
E1
L
N
Ø
TOP VIEW
END VIEW
e
b
COMMON DIMENSIONS
(Unit of Measure = mm)
A
A1
D
SIDE VIEW
Notes: This drawing is for general information only.
Refer to JEDEC Drawing MS-012, Variation AA
for proper dimensions, tolerances, datums, etc.
SYMBOL MIN
A
1.35
NOM
MAX
–
1.75
A1
0.10
–
0.25
b
0.31
–
0.51
C
0.17
–
0.25
D
4.80
–
5.05
E1
3.81
–
3.99
E
5.79
–
6.20
e
NOTE
1.27 BSC
L
0.40
–
1.27
Ø
0°
–
8°
6/22/11
TITLE
Package Drawing Contact:
8S1, 8-lead (0.150” Wide Body), Plastic Gull
[email protected] Wing Small Outline (JEDEC SOIC)
GPC
SWB
DRAWING NO.
REV.
8S1
G
Atmel AT30TS75 [DATASHEET]
8748B–DTS–4/12
32
8XM - MSOP
3
2
Pin 1
1
E
0.20 C B A
1
-B-
E1
CL
N
N
A2
3
2X
(N/2 TIPS)
TOP VIEW
SEE
DETAIL "A"
2
3
1
0.05 S
11.2
b
BOTTOM VIEW
END VIEW
e
0.25
BSC
A
0.07 R. MIN
2 PLACES
0.10 C
A1
-H-
D
1
SEATING PLANE
4
L 2
C
OC
SEATING
PLANE
DETAIL 'A'
-A-
COMMON DIMENSIONS
(Unit of Measure = mm)
SIDE VIEW
SYMBOL
NOTES:
1. DIMENSIONS "D" & "E1" DO NOT INCLUDE MOLD
FLASH OR PROTRUSIONS, AND ARE MEASURED
AT DATUM PLANE -H- , MOLD FLASH OR
PROTRUSIONS SHALL NOT EXCEED 0.15mm PER SIDE.
2. DIMENSION IS THE LENGTH OF TERMINAL
FOR SOLDERING TO A SUBSTRATE.
3. TERMINAL POSITIONS ARE SHOWN FOR REFERENCE ONLY.
4. FORMED LEADS SHALL BE PLANAR WITH RESPECT TO
ONE ANOTHER WITHIN 0.10mm AT SEATING PLANE.
5. DATUMS -A- AND -B- TO BE DETERMINED BY DATUM
PLANE -H- .
MIN
NOM
MAX
NOTE
A
-
-
1.10
A1
0.05
0.10
0.15
A2
0.75
0.85
0.95
b
0.22
-
0.38
D
2.90
3.00
3.10
1
3.10
1
2
E
E1
4.90 BSC
2.90
e
L
C
OC
Package Drawing Contact:
[email protected]
-C-
TITLE
8XM, 8-lead, 3.0x3.0mm Body, Plastic Thin
Shrink Small Outline Package (TSSOP/MSOP)
3.00
0.65 BSC
0.40
0.55
0.80
0°
4°
8°
GPC
TZD
3/1/11
DRAWING NO. REV.
8XM
Atmel AT30TS75 [DATASHEET]
8748B–DTS–4/12
A
33
11.3
8MA2 - UDFN
E
1
8
Pin 1 ID
2
7
3
6
4
5
D
C
A2
A
A1
E2
COMMON DIMENSIONS
(Unit of Measure = mm)
b (8x)
SYMBOL
8
1
MIN
D
2
Pin#1 ID
6
D2
3
5
4
e (6x)
L (8x)
K
D2
3.00 BSC
1.40
1.50
1.60
E2
1.20
1.30
1.40
A
0.50
0.55
0.60
A1
0.0
0.02
0.05
A2
–
–
0.55
C
L
NOTE
2.00 BSC
E
7
MAX
NOM
0.152 REF
0.30
0.35
e
0.40
0.50 BSC
b
0.18
0.25
0.30
K
0.20
–
–
3
7/15/11
Package Drawing Contact:
[email protected]
TITLE
8MA2, 8-pad, 2 x 3 x 0.6 mm Body, Thermally
Enhanced Plastic Ultra Thin Dual Flat No
Lead Package (UDFN)
GPC
YNZ
DRAWING NO.
8MA2
Atmel AT30TS75 [DATASHEET]
8748B–DTS–4/12
REV.
B
34
12.
Errata
12.1
DC Characteristics
Issue:
Devices currently do not meet the Active Current and Shutdown Mode Current
specifications. The current version of the devices will consume slightly elevated levels
current as indicated in the table below.
Datasheet
Specification
Symbol
Active
Current
ICC
Shutdown
Mode
Current
ISD
Note:
Parameter
1.
Errata Specification
Typ(1)
Max
Typ(1)
Max
Active Temperature Conversions,
Bus Inactive, VCC = 3.3V
75
100
95
125
Active Temperature Conversions,
Bus Inactive, VCC = Max
100
150
120
175
Active Temperature Conversion,
fSCL = 400KHz, VCC = 3.3V
125
175
No Change
No Change
Active Temperature Conversions,
fSCL = 400KHz, VCC = Max
180
230
200
250
Active Temperature Conversions,
fSCL = 3.4MHz, VCC = 3.3V
350
650
No Change
No Change
Active Temperature Conversions,
fSCL = 3.4MHz, VCC = Max
400
750
No Change
No Change
Bus Inactive, VCC = 3.3V
0.6
1.5
0.6
1.6
Bus Inactive, VCC = Max
1.1
3.0
1.1
3.5
fSCL = 400KHz, VCC = 3.3V
115
165
125
No Change
fSCL = 400KHz, VCC = Max
170
220
185
No Change
fSCL = 3.4MHz, VCC = 3.3V
310
600
No Change
No Change
fSCL = 3.4MHz, VCC = Max
360
700
No Change
No Change
Condition
Units
μA
μA
Typical values characterized at TA = +25°C unless otherwise noted.
Workaround: None. Devices will consume higher levels of current as specified above.
Resolution:
The Active Current and Shutdown Mode Current consumption will be reduced with a new revision
of the device. Please contact Atmel for the estimated availability of the new revision and the
method for distinguishing between device versions.
Atmel AT30TS75 [DATASHEET]
8748B–DTS–4/12
35
12.2
Temperature Sensor Accuracy Characteristics
Issue:
Devices currently do not meet the temperature sensor accuracy specification. The current
version of the devices may have some slight deviation in accuracy over the VCC and
temperature range as indicated in the table below.
Symbol
Parameter
Datasheet
Condition
TA = 0C to +85C
VCC = 2.7V to 5.5V
TA = -20C to +105C
VCC = 2.7V to 5.5V
TA = -40C to +125C
Sensor
Accuracy
TACC
VCC = 2.7V to 5.5V
TA = -55C to +125C
VCC = 2.7V to 5.5V(2)
Datasheet
Specification
Typ(1)
Max
±0.5
±1.0
±1.0
±2.0
±2.0
±3.0
±3.0
Errata
Condition
TA = 0C to +55C
VCC = 2.7V to 3.6V
TA = -5C to +90C
VCC = 2.7V to 3.6V
TA = -20C to +125C
VCC = 2.7V to 3.6V
TA = -40C to +125C
VCC = 2.7V to 5.5V
TA = 0C to +55C
VCC = 3.6V to 5.5V
TA = -20C to +105C
VCC = 3.6V to 5.5V
Notes: 1.
2.
Errata
Specification
Typ(1)
Max
±1.0
±1.5
±1.0
±2.0
±2.0
±3.0
Units
C
±3.0
±1.0
±2.0
±2.0
±3.0
Typical values characterized at VCC = 3.3V, TA = +25°C unless otherwise noted.
Sensor accuracy characterized to this range but not tested or guaranteed.
Workaround: None. Devices may not meet the original accuracy conditions as specified above.
Resolution:
The temperature sensor accuracy issues will be improved with a new revision of the device with
the goal to meet the original specified accuracy conditions. Please contact Atmel for the estimated
availability of the new revision and the method for distinguishing between device versions.
Atmel AT30TS75 [DATASHEET]
8748B–DTS–4/12
36
12.3
Fault Counter
Issue:
The internal fault counter will be reset when updating the Configuration Register, the THIGH Limit
Register, or the TLOW Limit Register.
Workaround: None. The current version of the device was intentionally designed to operate this way. However,
it has been discovered that resetting of the fault counter when updating the registers is not
preferred.
Resolution:
12.4
The operation of the device will be changed with a new revision of the device so that updating the
Configuration Register, the THIGH Limit Register, or the TLOW Limit Register will not affect the
internal fault counter. Please contact Atmel for the estimated availability of the new revision and
the method for distinguishing between device versions.
ALERT pin
Issue:
Depending on Power supply Ramp time, the ALERT pin may not be configured in the
proper state to be a true open drain.
Workaround: The ALERT pin must be pulled-high using an external pull-up resistor even when it is not used.
Care must also be taken to prevent this pin from being shorted directly to ground without a resistor
at any time whether during testing or normal operation.
Resolution:
13.
The operation of the ALERT Pin will be changed with a new revision of the device so that it is a
true open drain.
Revision History
Doc. Rev.
Date
Comments
Update alert pin’s function description and errata.
Update Power-up Timing figure.
Add device operation temperatures (–40°C to +125°C) accuracy guaranteed.
Add sensor accuracy typical ±3.0 and remove value from max.
8748B
04/2012
Correct Clock High Time max value from 40KHz to 400KHz.
Change 45μA to 75μA for low power dissipation typical active current.
Change 0.1μA to 1μA for Shutdown mode typical active current.
Change 200 to 500 for POR Time max value.
Remove preliminary status.
Update template.
8748A
03/2011
Inital document release.
Atmel AT30TS75 [DATASHEET]
8748B–DTS–4/12
37
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