ES51945(5000counts)
Dual Display/No Cap
Features
•
5000 counts dual LCD display
•
128L QFP package
•
3V DC power supply
•
ADC Conversion rate : 3.3 times/s
•
Full automatic measurement
*Voltage measurement: 500.0mV – 1000V
*Current measurement: 50.00A/500.0A,
500A/5000A
*Flame rod DCuA mode measurement:
500.0uA/5000uA both manual ranges
*Not contact AC electric field detection
*Frequency mode active on sub-display for ACA
500.0Hz ~ 5000Hz
*Resistance measurement: 500.0Ω – 50.00MΩ
*Frequency counter with duty cycle display:
500.0Hz – 50.00MHz
5% – 95% (< 10kHz)
•
ZERO function for DCA mode
•
Voltage high crest factor detection
(Taiwan
patent no.: 234661)
•
Voltage & Current measured simultaneously
ACV+ACA, DCV+DCA
•
Diode measurement & continuity check
•
Auto range temperature mode(500.0
0
C /5000
0
C)
•
Temperature mode with internal scale translation
circuit from
0
C to
0
F
•
Push functions:
*Single Select key operation:
Zero for DCA
Hz for ACA
*Range change function
*Data hold function
*Back light function
*Semi-auto Calibration Operation
(Taiwan
patent no.: 367334)
•
Low pass filter for ACA measurement
•
Band-gap reference voltage output
v2.3
1
10/06/25
•
CE selection (DC/AC 1010V, DC/AC 610V)
•
LCD segment check when power on
•
Auto power off (30min/15min)
•
Sleep state indicative signal output
•
Re-power on
•
On-chip buzzer driver
•
High Voltage (HV) danger indication
•
Low battery multi-level detection
Description
ES51945 is an integrated analog-to-digital
converter (ADC) with dual 5,000-count LCD
display, which 4-digit main-display (AC/DC
Voltage) and 4-digit sub-display (AC/DC
Current), automatic range selection, and 3V
DC power supply. ES51945 could be
designed for a clamp-meter with V & A
measurement simultaneously. Automatic
range selection is provided for voltage
(AC/DC)
measurement,
resistance
measurement, current measurement and
frequency counter. Other features include
offset removing feature for DCA clampmeter,
data holding, duty cycle measurement, diode
measurement, temperature measurement,
continuity checking, multi-level low battery
detection, auto power off, re-power on,
backlight driver, and buzzer output driver.
B
C
A
D
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
Application
Clamp meter
Pin Assignment
LQFP-128L
v2.3
1
2
CESEL
TSEL
ALARM
1
DIS
_LPF
DIS
DGB
DIS
DCA
NC
BKLIT
SEL
HOLD
RANGE
SAC
FC4
FC3
FC2
FC1
C-
C+
LB
AT9
V-
V-
V+
V+
DGND
AGND
AGND
1
2
ES51945
2
3
4
D
B
C
3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
NC
APOSEL
SVR
S50V
NC
NC
LCDCAP
OSC2
OSC1
BKOUT
BZOUT
ALARM
BP1
BP2
BP3
BP4
SEG01
SEG02
SEG03
SEG04
SEG05
SEG06
SEG07
SEG08
SEG09
SEG10
SEG11
NC
SEG12
SEG13
SEG14
SEG15
SEG16
SEG17
SEG18
SEG19
SEG20
SEG21
ADO_A
ADI_A
TEST5A
ACVLA
ACVHA
CSH+
CSH-
VA-
IVSL
IVSH
ADP
RAZ_A
BUF_A
CAZ_A
CINT_A
CLN_A
CLP_A
VRH
CLP_V
CLN_V
CINT_V
CAZ_V
BUF_V
RAZ
OHM C4
OHM C3
OHM C2
OHM C1
VR_A
DACAO
VR
DACVO
OR1
VR5
VR4
VR3
VR2
OVSG
102
101
100
99
98
97
96
95
94
93
92
91
90
89
88
87
86
85
84
83
82
81
80
79
78
77
76
75
74
73
72
71
70
69
68
67
66
65
SEG22
SEG23
SCL
SDA
CAL_EN
FREQ
BUZIN
SLEEP
LPFOUT
LPC3
LPC2
LPC1
OVH1
OVH
OVX
R1K
R9K
CA+
CA-
SGND
TEST5V
ADO_V
ADI_V
AC
VH_V
AC
VL_V
VR
1
4
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
ES51945(5000counts)
Dual Display/No Cap
10/06/25
A
ES51945(5000counts)
Dual Display/No Cap
Pin Description
Pin No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25-28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
v2.3
Symbol
ADO_A
ADI_A
TEST5_A
ACVL_A
ACVH_A
CSH+
CSH-
VA-
IVSL
IVSH
ADP
RAZ_A
BUF_A
CAZ_A
CINT_A
CLN_A
CLP_A
VRH
CLP_V
CLN_V
CINT_V
CAZ_V
BUF_V
RAZ
OHMC1-4
VR_A
DAC_AO
VR
DAC_VO
OR1
VR5
VR4
VR3
VR2
OVSG
VR1
ACVL_V
ACVH_V
ADI_V
ADO_V
TEST5_V
SGND
CA-
CA+
R9K
R1K
OVX
OVH
OVH1
Type
O
I
O
O
O
I/O
I/O
I
I
I
I
O
O
O
O
I/O
I/O
O
I/O
I/O
O
O
O
O
O
I
O
I
O
O
O
O
O
O
O
I
O
O
I
O
O
G
I/O
I/O
O
O
I
O
O
Description
Output of internal AC to DC OP Amp for ACA mode.
Negative input of internal AC to DC OP Amp for ACA mode.
Buffer output of SGND for ACA mode
DC signal low input in ACA mode. Connect to negative output
of external AC to DC converter.
DC signal high input in ACA mode. Connect to positive output of
external AC to DC converter.
Cap for duty-cycle mode
Cap for duty-cycle mode
For ADP mode. De-integrating voltage negative input
Current measurement input for higher range.
Current measurement input for lower range.
Measurement input in ADP mode. (Current/Temperature/NCV mode)
Buffer output pin in AZ and ZI phase for ADC_A.
Buffer output pin for ADC_A. Connect to integral resistor
Auto-zero capacitor connection for ADC_A.
Integrator output for ADC_A. Connect to integral capacitor.
Negative connection for reference capacitor of ADC_A.
Positive connection for reference capacitor of ADC_A.
Output of band-gap voltage reference. Typically –1.23V
Positive connection for reference capacitor of ADC_V.
Negative connection for reference capacitor of ADC_V.
Integrator output for ADC_V. Connect to integral capacitor.
Auto-zero capacitor connection for ADC_V.
Buffer output pin for ADC_V. Connect to integral resistor
Buffer output pin in AZ and ZI phase for ADC_V.
Filter capacitor connection1-4 for resistance mode.
Reference input voltage in current mode or ADP. Typically –400mV
DAC output for current mode or ADP input mode
Reference input voltage in voltage mode. Typically –400mV
DAC output for voltage mode
Reference resistor connection for 500.00Ω range
Voltage measurement ÷10000 attenuator(1000V)
Voltage measurement ÷1000 attenuator(500.0V)
Voltage measurement ÷100 attenuator(50.00V)
Voltage measurement ÷10 attenuator(5.000V)
Sense low voltage for resistance/voltage measurement
Measurement Input. Connect to a precise 10MΩ resistor.
DC signal low input in ACV mode. Connect to negative output
of external AC to DC converter.
DC signal high input in ACV mode. Connect to positive output of
external AC to DC converter.
Negative input of internal AC to DC OP Amp for ACV mode.
Output of internal AC to DC OP Amp for ACV mode.
Buffer output of OVSG for ACV mode
Signal Ground.
AC-coupled cap. for ACA Hz mode
AC-coupled cap. for ACA Hz mode
Connect to a 9KΩ resister for duty cycle measurement.
Connect to a 1KΩ resister for duty cycle measurement.
Sense input for resistance measurement
Output connection for resistance measurement
Output connection for resistance measurement (Optional)
3
10/06/25
ES51945(5000counts)
Dual Display/No Cap
53
54
55
56
57
58
59
60
61
62
63-86
87-90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115-118
119
120
121
122
123
124
125
126
127
128
LPFC1
LPFC2
LPFC3
LPFOUT
SLEEP
BUZIN
FREQ
CAL_EN
SDA
SCL
SEG24-SEG01
BP4-BP1
ALARM
BUZOUT
BKOUT
OSC1
OSC2
LCDCAP
NC
NC
S50V
SVR
APOSEL
NC
CESEL
TSEL
ALARM1
DIS_LPF
DIS_DGB
DIS_DCA
NC
BKLIT
SEL
HOLD
RANGE
SAC
FC4-FC1
C-
C+
LBAT9
V-
V-
V+
V+
DGND
AGND
AGND
O
O
O
O
O
I
I
I
I/O
O
O
O
O
O
O
I
O
I
-
-
I
I
I
-
I
I
O
I
I
I
-
I
I
I
I
I
I
O
O
I
P
P
O
O
P/G
P/G
P/G
Capacitor C1 connection for internal low-pass filter
Capacitor C2 connection for internal low-pass filter
Capacitor C3 connection for internal low-pass filter
Capacitor C1 connection for internal low-pass filter
Sleep mode indicator, asserts low in SLEEP mode.
Pull to V- to enable the BUZOUT.
Frequency counter input, offset V-/2 internally by the chip.
Pulled to V- to enable the semi-auto calibration scheme.
Input/Output from/to EEPROM 24C02 data
Output to EEPROM 24C02 clock
LCD segment output driver 01-24 (SEG signals)
LCD backplane 1-4 (COM signals)
LED control output driver for HV indication and NCV detection
Outputs a 2KHz audio frequency signal for driving piezoelectric
buzzer when BUZIN is low or functional key is active.
If BKLIT function is enabled, this pin will change from V- to V+
For 60 sec, once press BKLIT pin again within 60 sec, this pin will
Change back to V-.
Crystal oscillator input connection
Crystal oscillator output connection
LCD bias voltage bypass capacitor connection
Not connected
Not connected
Switch control for function selection
Switch control for function selection
Auto power off idle time selection
Not connected
OL selection feature control pin in Voltage mode.
Pulled to V- to cancel the 500
o
C auto range mode
LED control output driver for short-circuit detected in Cont. mode.
Pulled to V- to disable the low-pass-filter path in ACA mode
Pulled to V- to disable the buzzer beeper when HV danger appears.
Pulled to V- to disable DCA function in DCV mode.
Not connected
Back light function. Pulse to V- to set BKOUT pin output.
Pulse to V- to enable function selection
Pulse to V- to enable HOLD function.
Pulse to V- to enable manual mode and manual range selection.
Switch for AC/DC function selection.
Switches for function selection.
Negative capacitor connection for on-chip DC-DC converter.
Positive capacitor connection for on-chip DC-DC converter.
Multi-level low battery configuration input. Simple external resistor
divider is required.
Negative supply voltage.
Negative supply voltage.
Output of on-chip DC-DC converter and positive supply voltage.
Output of on-chip DC-DC converter and positive supply voltage.
Digital ground.
Analog ground.
Analog ground.
v2.3
4
10/06/25
ES51945(5000counts)
Dual Display/No Cap
Absolute Maximum Ratings
Characteristic
Supply Voltage (V- to AGND)
Analog Input Voltage
V+
AGND/DGND
Digital Input
Power Dissipation. Flat Package
Operating Temperature
Storage Temperature
Rating
-4V
V- -0.6 to V+ +0.6
V+
≥
(AGND/DGND+0.5V)
AGND/DGND
≥
(V- -0.5V)
V- -0.6 to DGND +0.6
500mW
0℃ to 70℃
-25℃ to 125℃
Electrical Characteristics
TA=25℃, V- = -3.0V
Parameter
Power supply
Operating supply current
In DCV+DCA mode
Voltage roll-over error
Voltage nonlinearity
Input Leakage
Zero input reading
Band-gap reference voltage
V
REF
Open circuit voltage for 500Ω
measurement
Open circuit voltage for other
Ω
measurement
Peak to peak backplane
drive voltage
Internal pull-high to 0V
current
AC frequency response at 5.000V
range
Multi-level low battery detector
3dB Bandwidth for ACA mode
Reference voltage temperature
coefficient
Note:
1. Full Scale
v2.3
5
10/06/25
V
t1
V
t2
f
3dB
TC
RF
I
pull-up
±1%
±5%
LBAT9 vs. V-
Low-pass-filter ON
100KΩ resister
between VRH/GND
0℃<TA<70℃
—
Symbol
Test Condition
V-
Normal operation
I
DD
In sleep mode
I
SS
REV 10MΩ input resistor
Best case straight
NLV
line
10MΩ input resistor
100KΩ resistor
between VRH and
AGND
Min.
-2.5
—
—
—
—
-10
-000
-1.29
—
-1.19
-3.5V
≤
V-
≤
-2.5V
Pin97-118 inputs
—
1.2
40-400
400-2000
2.15
1.82
4
100
—
—
µA
2.9
Typ.
-3.0
1.9
5
—
—
1
000
-1.23
-3.0
-1.08
3.1
Max
-3.5
2.2
10
±0.1
±0.1
10
+000
-1.17
—
-0.97
3.3
Units
V
mA
µA
%F.S
1
%F.S
1
PA
counts
V
V
V
V
—
—
—
—
—
—
—
—
HZ
V
kHz
ppm/℃
京公网安备 11010802033920号
EEWORLD
