Katalogový list obvodu TC620/621 (14 stran - 462kB)

Katalogový list obvodu TC620/621 (14 stran - 462kB)
TC620/TC621
5V, Dual Trip Point Temperature Sensors
Features
Package Type
• User Programmable Hysteresis and
Temperature Set Point
• Easily Programs with 2 External Resistors
• Wide Temperature Detection Range:
-0°C to 70°C: (TC620/TC621CCX)
-40°C to +125°C: (TC620/TC621CVX)
-40°C to +85°C: (TC620/TC621CEX)
-55°C to +125°C: (TC620/TC621CMX)
• Onboard Temperature Sensing Applications
(TC620X)
• External NTC Thermistor for Remote Sensing
Applications (TC621X)
• Available in 8-Pin PDIP and SOIC Packages
Applications
•
•
•
•
Power Supply Over Temperature Detection
Consumer Equipment
Temperature Regulators
CPU Thermal Protection
8-PDIP
NC 1
LOW SET 2
HIGH SET 3
TC620XCPA
TC620XEPA
8-PDIP
THERMISTOR 1
HIGH SET 2
LOW SET 3
TC621XCPA
TC621XEPA
Package
TC620X*COA
8-Pin SOIC
0°C to +70°C
TC620X*CPA
8-Pin PDIP
0°C to +70°C
TC620X*EOA
8-Pin SOIC
-40°C to +85°C
TC620X*EPA
8-Pin PDIP
-40°C to +85°C
TC620C*VOA
8-Pin SOIC
-40°C to +125°C
TC621X*COA
8-Pin SOIC
0°C to +70°C
TC621X*CPA
8-Pin PDIP
0°C to +70°C
TC621X*EOA
8-Pin SOIC
-40°C to +85°C
TC621X*EPA
8-Pin PDIP
-40°C to +85°C
NOTE: *The part code will be C or H.
(See Functional Block Diagrams).
6 LOW LIMIT
5 CONTROL
8-SOIC
NC 1
8
VDD
LOW SET 2
7
LOW LIMIT
HIGH SET 3
GND 4
TC620XCOA
TC620XEOA
TC620CVOA
6
HIGH LIMIT
5
CONTROL
8-SOIC
LOW SET 3
Part Number
VDD
7 HIGH LIMIT
8
GND 4
HIGH SET 2
Temperature
Range
6 LOW LIMIT
5 CONTROL
GND 4
THERMISTOR 1
Device Selection Table
VDD
7 HIGH LIMIT
8
VDD
7 HIGH LIMIT
8
TC621XCOA
TC621XEOA
GND 4
6 LOW LIMIT
5 CONTROL
General Description
The TC620 and TC621 are programmable logic output
temperature detectors designed for use in thermal
management applications. The TC620 features an
onboard temperature sensor, while the TC621
connects to an external NTC thermistor for remote
sensing applications.
Both devices feature dual thermal interrupt outputs
(HIGH LIMIT and LOW LIMIT), each of which is programmed with a single external resistor. On the TC620,
these outputs are driven active (high) when measured
temperature equals the user programmed limits. The
CONTROL (hysteresis) output is driven high when temperature equals the high limit setting and returns low
when temperature falls below the low limit setting. This
output can be used to provide ON/OFF control to a
cooling fan or heater. The TC621 provides the same
output functions except that the logical states are
inverted.
The TC620/TC621 are usable over operating
temperature ranges of 0°C to 70°C, -40°C to +125°C
and -55°C to 125°C.
 2002 Microchip Technology Inc.
DS21439B-page 1
TC620/TC621
Functional Block Diagrams
VDD
8
Temp. to
Voltage
Converter
4
TC620
+
2
LOW SET
VREF
GEN
7
LOW LIMIT
–
VREF
+
HIGH SET
3
VREF
GEN
6
HIGH LIMIT
–
R
S
Q
Q
5
CONTROL*
VDD
8
1
THERMISTOR
Thermistor
Interface
Circuit
4
TC621
+
HIGH SET
2
VREF
GEN
7
HIGH LIMIT
–
VREF
+
LOW SET
3
VREF
GEN
6
LOW LIMIT
–
R
S
Q
Q
5
CONTROL*
*Suffix code "C" denotes cooling option (High true CONTROL output).
Suffix code "H" denotes heating option (Low true CONTROL output).
DS21439B-page 2
 2002 Microchip Technology Inc.
TC620/TC621
1.0
ELECTRICAL
CHARACTERISTICS
*Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are
stress ratings only and functional operation of the device at
these or any other conditions above those indicated in the
operation sections of the specifications is not implied. Exposure to Absolute Maximum Rating conditions for extended
periods may affect device reliability.
Absolute Maximum Ratings*
Supply Voltage ....................................................... 20V
Input Voltage Any Input .. (GND – 0.3V) to (VDD +0.3V)
Package Power Dissipation (TA ≤ 70°C)
PDIP .............................................. 730mW
SOIC .............................................. 470mW
Derating Factors:
Plastic ........................................... 8mW/°C
Operating Temperature:
M Version......................... -55°C to +125°C
V Version ......................... -40°C to +125°C
E Version ........................... -40°C to +85°C
C Version .............................. 0°C to +70°C
Storage Temperature ......................... -65°C to +150°C
TC620/TC621 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: TA = 25°C, unless otherwise specified.
Symbol
Parameter
Min
Typ
Max
Unit
VDD
Supply Voltage Range
4.5
—
18
V
IDD
Supply Current
—
270
400
µA
Test Conditions
5V ≤ VDD ≤ 18V
ROUT
Output Resistance
—
400
1000
W
Output High or Low, 5V ≤ VDD ≤ 18V
IOUT
Output Current
—
—
1
mA
Temp Sensed
Source/Sink
IOUT
Output Current
—
—
1
mA
Cool/Heat
Source/Sink
TERR
Absolute Accuracy
T-3
T
T+3
°C
T = Programmed Temperature
 2002 Microchip Technology Inc.
DS21439B-page 3
TC620/TC621
2.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
PIN FUNCTION TABLE
Pin No.
(8-Pin PDIP)
(8-Pin SOIC)
0°C to +70°C
-40°C to +85°C
-40°C to +125°C
Symbol
1
NC
2
LOW SET
Low temperature set point. Connect an external 1% resistor from LOW SET to VDD
to set trip point.
3
HIGH SET
High temperature set point. Connect an external 1% resistor from HIGH SET to
VDD to set trip point.
4
GND
Description
No Internal Connection.
Ground Terminal.
5
CONTROL
Control output.
6
HIGH LIMIT
High temperature push/pull output.
7
LOW LIMIT
Low temperature push/pull output.
8
VDD
Power supply input.
Pin No.
(8-Pin PDIP)
(8-Pin SOIC)
0°C to +70°C
-40°C to +85°C
Symbol
1
THERMISTOR
2
HIGH SET
High temperature set point. Connect an external 1% resistor from HIGH SET to
VDD to set trip point.
3
LOW SET
Low temperature set point. Connect an external 1% resistor from LOW SET to
VDD to set trip point.
4
GND
Description
Thermistor input.
Ground Terminal.
5
CONTROL
Control output.
6
LOW LIMIT
Low temperature push/pull output.
7
HIGH LIMIT
8
VDD
DS21439B-page 4
High temperature push/pull output.
Power supply input.
 2002 Microchip Technology Inc.
TC620/TC621
DETAILED DESCRIPTION
The TC620 has a positive temperature coefficient temperature sensor and a dual threshold detector. Temperature set point programming is accomplished with
external resistors from the HIGH SET and LOW SET
inputs to VDD. The HIGH LIMIT and LOW LIMIT outputs
remain low as long as measured temperature is below
set point values. As measured temperature increases,
the LOW LIMIT output is driven high when temperature
equals the LOW SET set point (±3°C max). If temperature continues to climb, the HIGH LIMIT output is driven
high when temperature equals the HIGH SET set point
(Figure 3-1). The CONTROL (hysteresis) output is
latched in its active state at the temperature specified
by the HIGH SET resistor. CONTROL is maintained
active until temperature falls to the value specified by
the LOW SET resistor.
FIGURE 3-1:
TC620/TC621 INPUT VS.
OUTPUT LOGIC
Care must also be taken to ensure the LOW SET
temperature setting is at least 5°C lower than the HIGH
SET temperature setting.
Figure 3-2 can help the user obtain an estimate of the
external resistor values required for the desired LOW
SET and HIGH SET trip points.
FIGURE 3-2:
200
150
100
50
-55
-35
-15
5
25
45
65
85
105
125
TEMPERATURE (˚C)
High Set Point
Temperature
Low Set Point
Low Limit Output
High Limit Output
Control Output (Cool Option
Control Output (Heat Option)
3.1
TC620 SENSE
RESISTORS VS. TRIP
TEMPERATURE
250
RESISTANCE, RTRIP (kΩ)
3.0
Programming the TC620
3.2
Built-in Hysteresis
To prevent output "chattering" when measured
temperature is at (or near) the programmed trip point
values, the LOW SET and HIGH SET inputs each have
built-in hysteresis of -2°C below the programmed
settings (Figure 3-3).
FIGURE 3-3:
The resistor values to achieve the desired trip point
temperatures on HIGH SET and LOW SET are
calculated using Equation 3-1:
EQUATION 3-1:
BUILT-IN HYSTERESIS ON
LOW LIMIT AND HIGH
LIMIT OUTPUTS
Set Point
(Set Point 2˚C)
RTRIP = 0.5997 x T 2.1312
Where:
RTRIP = Programming resistor in Ohms
T = The desired trip point temperature in degrees
Kelvin.
For example, a 50°C setting on either the HIGH SET
or LOW SET input is calculated using Equation 3-2 as
follows:
High Limit
or Low Limit
Output
As shown, the outputs remain in their active state
(hysteresis) until temperature falls an additional 2°C
below the user's setting.
EQUATION 3-2:
RSET = 0.5997 x ((50 + 273.15)2.1312) = 133.6kΩ
Care must be taken to ensure the LOW SET programming resistor is a smaller value than the HIGH SET
programming resistor. Failure to do this will result in
erroneous operation of the CONTROL output.
 2002 Microchip Technology Inc.
DS21439B-page 5
TC620/TC621
Using the TC621
The TC621 operation is similar to that of the TC620, but
requires an external NTC thermistor. Use the resistance versus temperature curve of the thermistor to
determine the values of the programming resistors.
Note that the pin numbers for the HIGH SET and LOW
SET programming resistors for the TC621 are reversed
versus that of the TC620 (i.e., the resistor value on
HIGH SET [Pin 2] should always be lower than the one
connected to LOW SET [Pin 3]). Also note that the
outputs of the TC621 are LOW TRUE when used with
an NTC thermistor.
3.4
TC621 Thermistor Selection
FIGURE 3-4:
300
250
200
150
100
50
0
0
The TC621 uses an external thermistor to monitor the
controlling temperature. A thermistor with a resistance
value of approximately 100kΩ at 25°C is
recommended.
A temperature set point is selected by picking a resistor whose value is equal to the resistance of the thermistor at the desired temperature. For example, using
the data shown in Figure 3-4, a 30kΩ resistor between
HIGH TEMP (Pin 2) and VDD (Pin 8) sets the high
temperature trip point at +51°C and a 49kΩ resistor on
LOW TEMP (Pin 3) sets the low temperature trip point
to +41°C.
DS21439B-page 6
TYPICAL NTC
THERMISTOR
350
THERMISTOR RESISTANCE (kΩ)
3.3
10
20
30
40
50
60
70
TEMPERATURE (˚C)
3.5
TC620/TC621 Outputs
Both devices have complimentary output stages. They
are rated at a source or sink current of 1mA maximum.
 2002 Microchip Technology Inc.
TC620/TC621
4.0
TYPICAL APPLICATIONS
4.2
4.1
Dual Speed Temperature Control
In the application in Figure 4-2, a high and a low temperature is selected by two RL and RH. The TC620
monitors the ambient temperature and turns the FET
switch on when the temperature exceeds the HIGH
TEMP set point. The fan remains on until the temperature decreases to the LOW TEMP set point. This
provides the hysteresis. In this application, the fan
turns on only when required.
In Figure 4-1, the Dual Speed Temperature Control
uses a TC620 and a TC4469 quad driver. Two of the
drivers of the TC4469 are configured in a simple oscillator. When the temperature is below the LOW TEMP
set point, the output of the driver is OFF. When the temperature exceeds the LOW TEMP set point, the
TC4469 gates the oscillator signal to the outputs of the
driver. This square wave signal modulates the remaining outputs and drives the motor at a low speed. If this
speed cannot keep the temperature below the HIGH
TEMP set point, then the driver turns on continuously
which increases the fan speed to high. The TC620 will
monitor the temperature and only allow the fan to operate when needed and at the required speed to maintain
the desired temperature. A higher power option can be
designed by adding a resistor and a power MOSFET.
FIGURE 4-1:
Temperature Controlled Fan
The TC621 uses an external thermistor to monitor the
ambient temperature. This adds one part, but allows
more flexibility with the location of the temperature
sensor.
DUAL SPEED TEMPERATURE CONTROL
+12V
0.1µF
2
3
High Temp. 1
5
50˚C
High 6 1N4148
Limit
TC620
Low 7
Limit
Temperature Scale
1M
1N4148
1µF
Fan Motor
14
2
1
3
5
8
TC4469
4
0˚C – 30˚ C (Fan Off)
30˚C – 50˚ C (Fan Low)
50˚C – UP (Fan High)
FIGURE 4-2:
10µF
8
Low Temp
30˚C
VMOTOR
10k
13
4
6
9
10
11
12
100k
50 Ω
MOSFET
50pF
Higher Power Option
7
Fan Motor
TEMPERATURE CONTROLLED FAN
+12V
+12V
Thermistor
(NTC)
Low Temp. 1
RL
2
3
RH
4
High Temp.
8
TC620
 2002 Microchip Technology Inc.
Fan Motor
7
6
5
MTP3055E
High
Temp.
1
2
RH
3
Low Temp. RL
4
8
TC621
Fan Motor
7
6
5
MTP3055E
DS21439B-page 7
TC620/TC621
FIGURE 4-3:
HEATING AND COOLING APPLICATION
4.5V to 18V
High
Temp.
Low
Temp.
1
2
3
4
TC620
8
7
6
5
1
2
3
4
5
6
7
TC4469
14
13
12
11
10
9
8
1k
1k
High
Temp.
Warning
Low
Temp.
Warning
Heating/Cooling
Equipment
DS21439B-page 8
 2002 Microchip Technology Inc.
TC620/TC621
5.0
PACKAGING INFORMATION
5.1
Package Marking Information
Package marking data not available at this time.
5.2
Taping Form
Component Taping Orientation for 8-Pin SOIC (Narrow) Devices
User Direction of Feed
PIN 1
W
P
Standard Reel Component Orientation
for TR Suffix Device
Carrier Tape, Number of Components Per Reel and Reel Size
Package
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
12 mm
8 mm
2500
13 in
8-Pin SOIC (N)
5.3
Package Dimensions
8-Pin Plastic DIP
PIN 1
.260 (6.60)
.240 (6.10)
.045 (1.14)
.030 (0.76)
.070 (1.78)
.040 (1.02)
.310 (7.87)
.290 (7.37)
.400 (10.16)
.348 (8.84)
.200 (5.08)
.140 (3.56)
.040 (1.02)
.020 (0.51)
.150 (3.81)
.115 (2.92)
.110 (2.79)
.090 (2.29)
.022 (0.56)
.015 (0.38)
.015 (0.38)
.008 (0.20)
3° MIN.
.400 (10.16)
.310 (7.87)
Dimensions: inches (mm)
 2002 Microchip Technology Inc.
DS21439B-page 9
TC620/TC621
Package Dimensions (Continued)
8-Pin SOIC
PIN 1
.157 (3.99)
.150 (3.81)
.244 (6.20)
.228 (5.79)
.050 (1.27) TYP.
.197 (5.00)
.189 (4.80)
.069 (1.75)
.053 (1.35)
.020 (0.51) .010 (0.25)
.013 (0.33) .004 (0.10)
.010 (0.25)
.007 (0.18)
8° MAX..
.050 (1.27)
.016 (0.40)
Dimensions: inches (mm)
DS21439B-page 10
 2002 Microchip Technology Inc.
TC620/TC621
SALES AND SUPPORT
Data Sheets
Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recommended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following:
1.
2.
3.
Your local Microchip sales office
The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277
The Microchip Worldwide Site (www.microchip.com)
Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using.
New Customer Notification System
Register on our web site (www.microchip.com/cn) to receive the most current information on our products.
 2002 Microchip Technology Inc.
DS21439B-page 11
TC620/TC621
NOTES:
DS21439B-page 12
 2002 Microchip Technology Inc.
TC620/TC621
Information contained in this publication regarding device
applications and the like is intended through suggestion only
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
No representation or warranty is given and no liability is
assumed by Microchip Technology Incorporated with respect
to the accuracy or use of such information, or infringement of
patents or other intellectual property rights arising from such
use or otherwise. Use of Microchip’s products as critical components in life support systems is not authorized except with
express written approval by Microchip. No licenses are conveyed, implicitly or otherwise, under any intellectual property
rights.
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© 2002, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
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 2002 Microchip Technology Inc.
DS21439B-page 13
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03/01/02
*DS21439B*
DS21439B-page 14
 2002 Microchip Technology Inc.
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