DTM0660 Datasheet
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Note: Some non-essential portion of the document was intentially omitted or abbreviated.
Revision 1.0
Table of Contents
1. Introduction.................................................................................................................................................... 1
2. Main Features................................................................................................................................................ 1
3. Measurement Types...................................................................................................................................... 2
4. Applications.................................................................................................................................................... 2
5. Block Diagram............................................................................................................................................... 2
6. Pinout............................................................................................................................................................ 3
7. Pin Descriptions............................................................................................................................................. 3
8. Technical Specifications (VDD=3V, Ta=25°C)................................................................................................ 5
9. Key definition................................................................................................................................................. 7
10. Miscellaneous.............................................................................................................................................. 7
11. EEPROM Settings....................................................................................................................................... 8
12. Calibration procedure................................................................................................................................ 10
1. Introduction
DTM0660 has a built-in 14 bit noise free sigma delta ADC and can achieve 6600 counts in all measurement
ranges. It provides fast output, with rate up to 12.5 kHz. With its builtin DSP, It can measure true RMS up to
1kHz without any additional components.
It has built-in calibration routine with external EEPROM and can achieve high precision calibration and support
many user configurations.
2. Main Features
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Maximum display count: 4000/6000 (9999 for frequency and capacitance)
Conversion rate: 3/second
Ranging: manual/automatic
Polarity indication: automatic
Supply voltage: 2.4V ~ 3.6V
Current Consumption: <=1 mA (<= 2uA in sleep mode)
AC Rectification: built-in true RMS processor, no external components needed. 1 kHz bandwidth, error <
0.5%. Fast reacting.
Multifunction switching network, support fast autoranging.
Configuration and calibration stored in external EEPROM
Built-in 100ppm/C low drift 1.2V reference
Function Keys: SELECT, RANGE, REL, HZ/DUTY, HOLD (BACKLIGHT), MAX/MIN, BACKLIGHT
Support 4x15 LCD with symbols/units and backlights.
Built in temperature detector. It can be used for thermocouple's cold junction compensation without the
need for external components.
Can set 2. Main FeaturesOL value for current and voltage measurements as well as alarm threshold.
Min/Max data recording
Auto power off: 15 min or 30 min (configurable)
Low voltage detection: external or internal. Internal two-point voltage detection when using 3V supply,
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•
•
external single-point voltage detection when using 4.5V ~ 9V supply.
Beeper frequency: 1.95 kHz
Packaging: bare die or LQFP64
3. Measurement Types
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DC Voltage: 60.00mV/600.0mV, (600.0mV)/6.000V/60.00V/600.0V/1010V
AC Voltage: 60.00mV/600.0mV, (600.0mV)/6.000V/60.00V/600.0V/750V
DC Current: 600.0uA/6000uA, 60.00mA/600.0mA, 6.000A/60.0A
AC Current: 600.0uA/6000uA, 60.00mA/600.0mA, 6.000A/60.0A
Resistance: 600.0Ω/6.000kΩ/60.00kΩ/600.0kΩ/6.000MΩ/60.00MΩ
Capacitance: 9.999nF/99.99nF/999.9nF/9.999uF/99.99uF/999.9uF/9.999mF/99.99mF
Frequency: 9.999Hz/99.99Hz/999.9Hz/9.999kHz/99.99kHz/999.9kHz/9.999MHz
Duty cycle: 1% ~ 99%
Diode: 0.000V ~ 3.000V. OL when above 3.0V
Continuity: Beep when < 60Ω, OL when > 600Ω
Clamp current meter: user can set range, decimal. Single or dual automatic ranges.
Temperature: C/F
Transistor: 0 ~ 2000 (hFE)
Non-contact Voltage detection (NCV)
4. Applications
5. Block Diagram
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6. Pinout
7. Pin Descriptions
Pin
Symbol
Port
Description
1~12
SEG3~SEG14
O
Segment 3 ~ 14
13
PT2.3
TMCK1, LVDIN
I/O
I
Data input/output.
RC clock input, LVD external input
14
P2.2
PWM, PFD
I/O
I
Data input/output
PWM output, frequency output
15
PT2.1, XTI
I/O, I
Data input/output, external oscillator in
16
PT2.0, XTO
IO, O
Data input/output, external oscillator out
17
PT1.7, PSDO, BZ
I/O, O
Data input/output, beeper output, OTP read/write port (PSDO)
18
PT1.6, SCK
I/O
Data input/output, SPI communication port (SCK)
19
PT1.5, SDO
I/O, O
Data input/output, SPI communication port (SDO)
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20
PT1.4, TX
I/O, O
Data input/output, EUART port (TX)
21
PT1.3, RC, TST
I
Data input, EUART port (RC), mode test
22
PT1.2, SDI
I/O, I
Data input/output, SPI communication port (SDI)
23
PT1.1
SCE, PSDI, INIT
I/O
I
Data input/output
SPI communication port (SCE), OTP read/write port (PSDI), interrupt
source (INITI)
24
PT1.0
PSCK, INTO
I/O
I
Data input/output
OTP read/write port (PSCK), interrupt source (INTO)
25
PT3.6, CNT
I/O, I
Data input/output, frequency counter input
26
PT3.7, CMPO
I/O, O
Data input/output, comparator output
27
PT2.7
CMP3, INT27
I/O
I
Data input/output
comparator input, interrupt E27IF
28
PT2.6
CMP2, INT26
I/O
I
Data input/output
comparator input, interrupt E26IF
29
PT2.5
CMP1, INT25
I/O
I
Data input/output
comparator input, interrupt E25IF
30
PT2.4
CMP0, INT24
I/O
I
Data input/output
comparator input, interrupt E24IF
31
PT3.5, PB5
I/O, I
Data input/output A/D input
32
PB4
I
A/D input
33
PB3
I
A/D input
34
PB1/PB2
I
A/D input
35
PB0
I
A/D input
36
FTP
I/O
Front-end filter capacitor
37
FTN
I/O
Front-end filter capacitor
38
RLU
I/O
A/D switch network port
39
RLD
I/O
A/D switch network port
40-46
PA6-PA0
I/O
A/D switch network port
47
REFO
I/O
1.2V reference output
48
AGND
I/O
Analog ground (COM)
49
ACM
I/O
Reference voltage
50
VDDA
I/O
Voltage after doubling regulated
51
VGG
O
Voltage pump
52
CA
I/O
Voltage pump capacitor
53
CB
I/O
Voltage pump capacitor
54
VSS
P
IC ground
55
RST, VPP
I, P
IC reset, EEPROM read/write voltage
56
VDD
P
IC supply voltage
57
VLCD
I/O
LCD power
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58~61 COM0~COM3
O
Common cathod 0~3
62~64 SEG0~SEG2
O
Segment 0~2
8. Technical Specifications (VDD=3V, Ta=25°C)
Maximum ratings
Parameter
Symbol
Maximum value
Power supply voltage
VDD(VDDA) – VSS(VSSA)
-0.2V~4V
Voltage applied to any pin
-0.3V ~VDD+0.3V
Pin protection diode withstand
current
+-2mA
Storage temperature
Tstg
-50C~150C
Soldering temperature
Temp
300 C
Soldering time
Time
10 Second
Power dissipation
500 mW
Re commanded working condition
Symbol
Parameter
Measurement Condition
Min
VDD
Power supply
Peripherals and CPU
2.2
3.6
Analog peripherals
2.4
3.6
0
0
VSS
Power supply
Clock Crystal
Max
XTSP[0]=0
XTHSP[0]=0
32.768 kHz
Ceramic Osc
XTSP[0]=1
XTHSP[0]=0
400k
8M
Crystal Osc
XTSP[0]=01
XTHSP[0]=0
1M
8M
XT
VDD=2.2V
ENXT[0]=1
Typical
Unit
V
Hz
Internal RC Oscillator
Symbol
Parameter
Condition
Min
Typical
Max
Unit
HAO
High speed oscillator
ENHAO[0]=1
4
MHz
LPO
Low power oscillator
VDD LPO
32
kHz
Power draw
Symbol
Parameter
Test Condition
IAM1
Active mode 1
OSC_CY=8MHz, OSC_HAO=off
CPU_CK=8MHz
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Min
Typical
Max
Unit
1.34
2
mA
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IAM2
Active mode 2
OSC_CY=off, OSC_HAO=4MHz
CPU_CK=4MHz
0.36
0.55
mA
IAM3
Active mode 3
OSC_CY=off, OSC_HAO=4MHz
CPU_CK=2MHz
02.
0.3
mA
ILP1
Low Power 1
OSC_CY=32768Hz, OSC_HAO=off
CPU_CK=16384Hz
7
12
uA
ILP2
Low Power 2
OSC_CY=off, OSC_HAO=off
CPU_CK=LPO, Idle state
1.65
3
uA
ILP3
Low Power 3
OSC_CY=off, OSC_HAO=off
CPU_CK=off, Sleep mode
0.65
1.3
uA
Port 1~ Port 3
Symbol
Parameter
Condition
Min
Typical
Max
Unit
Input Voltage, Schmitt Trigger, Leak current, duration
VIH
Input HIGH
2.2
VIL
Input LOW
VHYS
Input hysteresis (VIH-VIL)
ILKG
Leakage current
RPU
Pull-up resistor
V
0.9
0.8
0.1
uA
180
kΩ
Output Voltage, Current
VOH
Output HI
IOH=10mA
VOL
Output LOW
IOL=10mA
Vdd-0.3
V
Vss+0.3
Reset (power loss, external reset, low voltage detection)
Symbol
BOR
Parameter
Condition
Min
Pulse width for internal reset, td-LVR
2
VDD reset transition voltage (L->H) VLVR
1.6
Hysteresis VHYS-VLVR
RST
LVD
Typical
Max
Unit
us
1.85
2.1
70
V
mV
Pulse width for reset (/VPP), td-RST
2
us
Input voltage for reset
0.9
V
Hysteresis, VHYS-RST
0.8
Current ILVD
10
Reference Voltage
1.2
V
100
ppm/C
2.4
V
2.2
V
Reference Temp Co
TA=-45C~85C
First LVD detection voltage
Second LVD detection voltage
BOR=Brownout Reset
LVR=Low Voltage Reset of BOR
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V
15
uA
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LVD=Low Voltage Detect
RST=Reset (External Reset Pin)
Parameters in DMM application
Parameter
Condition
Min
Typical
Max
Unit
0 input reading
VIN=0, Calibrated at 500mV
-1
0
+1
digit
0 input tempco
VIN=0, Calibrated at 500mV, TA=0~70C
-0.003
0
+0.003
digit/C
Linearity
Calibrated at 500mV
-1
0
+1
digit
Input leakage current
VIN=0V
1
10
pA
Comparator Bandwidth
(CMPH & CMPL)
VIN=600mVp-p (sine)
VIN=400mVp-p (sin)
6
2
MHz
MHz
Comparator Current
CMPH & CMPL
40
uA
Switch network resistance PS0~PS1
20
DS0~DS1
40
DS2~DS6, PS2~PS6
80
SS0~SS6, FS0~FS6
400
No input to reference buffer
90
uA
Low pass filter current
50
uA
True RMS converter
Current
210
uA
Current in Sleep mode
1
uA
ADI Operating Current
Ω
9. Key definition
10. Miscellaneous
•
Upon power up, all segments are lit for 2 seconds and then enter normal measuring mode. If there is an
EEPROM error, ErrE is displayed.
•
Auto power off. If there is no activity for 15 minutes (can be configured) meter enters sleep mode. If
Select function key is pressed while in sleep mode, the meter resumes to normal function. If Select is
pressed while turning on meter, auto power off is disabled. Auto power off is re-enabled if the meter is
power cycled.
•
Beeper. The beeper will beep once (~0.25 sec) whenever a valid key is pressed or the range is
changed. In current and voltage mode, the beeper will beep when the current or voltage exceeds the
preset maximum value (e.g. AC>600V, DC>1000V, Current>10A) as warning. The beeper will beep 5
times 1 minute prior to power down. Before power down, there will be a long beep. If auto power off is
disabled, every 15 minutes (or at the preset power off interval), the beeper will beep 5 times.
•
Low voltage detection: when using 3V as power supply the battery symbol will display if voltage drops
below 2.4V but the meter can still function normally. If the voltage drops below 2.2V, only the battery
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symbol will display upon power on.
•
When the supply voltage is 4.5V~9V, the design condition is such that when the supply voltage drops to
75% of the original value and the value at PT2.3/LVD should measure 1.2V. In practice, two resistances
can be connected in series between the positive and negative terminal of the battery, connect the divider
to PT2.3/LVD, adjust the divider so that the if PT2.3 is lower than 1.2V display the battery symbol. Meter
remains functional when the battery symbol is displayed.
•
PT1.2 outputs high when active and low when in sleep mode. It can be used to control pheripherals.
11. EEPROM Settings
EEPROM initialization data
addr 0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
00
FF
FF
FF
FF
FF
FF
FF
FF
FF
52
00
FA
00
00
BE
03
10
10
17
38
18
44
02
6E
4B
64
3C
3C
3C
0A
FF
40
FF
20
99
99
00
80
64
00
96
00
00
80
00
80
00
80
00
80
30
4E
02
09
4E
D2
09
77
FD
0A
9A
19
0A
00
00
0A
00
40
00
01
00
01
00
07
98
00
64
00
64
00
64
00
00
00
50
00
80
00
80
00
80
00
80
00
80
00
80
00
80
00
80
60
00
80
00
83
01
00
6D
2A
00
00
00
00
00
00
00
00
70
00
80
00
80
00
80
E0
7C
18
01
00
00
00
00
00
00
80
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
90
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
A0
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
B0
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
C0
0D
00
02
10
0D
00
03
20
20
00
03
20
20
00
03
10
D0
41
00
03
08
41
00
03
05
41
00
03
05
0D
00
02
20
E0
00
80
00
80
00
80
00
80
00
80
00
80
00
80
00
80
F0
00
80
FF
FF
FF
FF
FF
FF
5A
C7
CC
0F
0F
82
00
00
EEPROM Setting Description (do not change data that is reserved or unmentioned)
Address
Default
Description
F9H
Bit 7: 1
Reserved
Bit 6: 1
Reserved
Bit 54: 00
VDD, 00=3.6V, 01=3.2V, 10=2.8V, 11=2.4V
Bit 32: 01
VLCD, 00=3.3V, 01=3.0V, 10=2.8V, 11=2.5V
Bit 1: 1
PT1.2 state upon power on: 1: PT1.2=1, 0: PT1.2=0 (note, when PT1.2 used to
synchronize with NCV state, it can only be set to 1)
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Bit 0: 1
1 NCV (PT1.2 is synchronized with the beeper. 1 = beep, 0 = no beep)
Bit 7: 1
1: MV ranges are 60.00mV/600.0mV; 0: MV range is 600.0mV
Bit 6: 1
Reserved
Bit 43: 01
00: when backlight is on PT2.2=0; when off PT2.2=1
01: when backlight is on PT2.2=1; when off PT2.2=0
10: when backlight is on PT2.2=PWM, PT2.3=0; when off PT2.2=1, PT2.3=1
11: when backlight is on PT2.2=PWM, PT2.3=1; when off PT2.2=1, PT2.3=0
(when backlight is in on/off mode, PT2.3 is used for low voltage detection. When
backlight is in PWM mode, PT2.3 is used as the backlight switch)
Bit 2: 1
1: HOLD key can turn on backlight via long press; 0: Function unavailable
Bit 1: 0
1: REL key can turn on RS232 via long press; 0: Function unavailable
Bit 0: 0
1: clamp meter, 0: multimeter
FBH
0FH
Time before auto poweroff (1-255 minutes). Default: 15 minutes. 0: auto poweroff
disabled
FCH
0FH
Backlight on duration (1-255 seconds). Default: 15 seconds. 0: backlight stays on.
FDH
82H
Bit 7: 1 Frequency range switchable. Pt3.6 & RLD
: 0 Frequency range fixed Pt3.6
Bit 6: 1 UART format bit3~bit0 → com0~com3
: 0 UART format bit3~bit0 → com3~com0
Bit 5: 1 UART uses 14 bytes format (seg0~seg13)
: 0 UART uses 15 bytes format (seg0~seg14)
Bit 4: 1 PT1.2 used for NCV LED only
: 0 PT1.2 used for NCV LED and power LED
Bit 3~Bit 0: Low voltage power off delay (seconds), default 2s, max 15s
10H, 11H
1770H
Default full range 6000d (10H stores low byte 70H, 11H stores high byte 17H)
same low byte/high byte arrangement below
12H, 13H
1838H
Range switch upper limit 6200d (for full range of 4000d the upper limit is 4200d)
14H, 15H
0244H
Range switch lower limit 580d (for full range of 4000d the lower limit is 380d)
16H
6EH
DC Voltage OL value : 1100V (unit *10V)
17H
4BH
AC Voltage OL value: 750V (unit *10V)
18H
64H
DC Voltage warning voltage 1000V (unit *10V)
19H
3CH
AC Voltage warning voltage 600V (unit *10V)
1AH
3CH
uA range warning current 6000uA (unit *100uA)
1BH
3CH
mA range warning current 600mA (unit *100mA)
1CH
0AH
A range warning current 10A (unit A)
1EH
40H
NCV display symbol default is the G segment (bit0~6 corresponds to ABCDEFG
segment)
20H, 21H
9999H
Amplifier parameter
22H, 23H
8000H
500mV calibration adjustment ratio
24H, 25H
0064H
NCV base number (10.0 mV)
26H, 27H
0096H
NCV resolution (15.0 mV)
FAH
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28H, 29H
8000H
AC 6V range compensation ratio (frequency)
2AH, 2BH
8000H
500uA calibration adjustment ratio
2CH, 2DH
8000H
50mA calibration adjustment ratio
2EH, 2FH
8000H
5A calibration adjustment ratio
60H, 61H
8000H
50K resistor calibration adjustment ratio
62H, 63H
8000H
50M resistor calibration adjustment ratio
70H, 71H
8000H
500nF capacitor calibration adjustment ratio
74H, 75H
8000H
50uF capacitor calibration adjustment ratio
76H, 77H
8000H
50mF capacitor calibration adjustment ratio
0BH, 0CH
00FAH
Environment temperature (25 C)
0DH~0FH
03BE00H
Environment temperature default ADC value
50H, 51H
8000H
6A range calibration adjustment ratio
52H, 53H
8000H
60A range calibration adjustment ratio
54H, 55H
8000H
600A range calibration adjustment ratio
56H, 57H
8000H
6000A range calibration adjustment ratio
40H, 41H
0100H
AC60mV range noise to be subtracted (input signal is internally amplified)
42H, 43H
0100H
AC600mV range noise to be subtracted (input signal is not amplified)
44H, 45H
0700H
AC600mV range noise to be subtracted (10M/1.111M resistor divider, amplified)
46H, 47H
0098H
AC6V range noise to be subtracted (10M/1.111M resistor divider)
48H, 49H
0064H
AC60V range noise to be subtracted (10M/101K resistor divider)
4AH, 4BH
0064H
AC600V range noise to be subtracted (10M/10K resistor divider)
4CH, 4DH
0064H
AC1000V range noise to be subtracted (10M/1K resistor divider)
78H, 79H
0118H
Capacitor 9nF range base line to be subtracted (e.g. when no capacitor is connected,
unit 0.001 nF)
80H~BFH
Measurement functionality setting (shaded area)
E8H, E9H
8000H
DC 600mV range calibration adjustment ratio
EAH, EBH
8000H
DC 6V range calibration adjustment ratio
ECH, EDH
8000H
DC 60V range calibration adjustment ratio
EEH, EFH
8000H
DC 600V range calibration ratio
F0H, F1H
8000H
DC 1000V range calibration ratio
12. Calibration procedure
Key assignment in Calibration mode:
SELECT: skip/function select
HOLD: subtract (-)
Other keys: add (+)
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