3 1/2 CAP AUTO DMM
Features
•
2000 count display
•
Full automatic measurement
*Voltage measurement
*Current measurement
*Resistance measurement
•
Capacitance measurement (Auto range:
2n to 2mF)
(Taiwan
patent no: 453443)
•
20MHz Frequency counter
•
Range change function
•
Data hold function
•
Diode measurement
•
ADP mode with external reference
voltage
•
Serial data output (RS232 format)
•
Auto power off (10 mins) and re-power
on
•
Low battery detect (3V and 9V)
•
3V DC power supply
•
Back light function
ES51982
Description
ES51982 is an integrated analog-to-digital
converter (ADC) with 2000 counts LCD
display, automatic range selection, and 3V
DC power supply. Automatic range
selection is provided for voltage(AC/DC)
measurement, resistance measurement,
current
measurement,
capacitance
measurement,
frequency
counter.
Expensive and bulky mechanical range
switches are not required. Other features
include data holding, diode measurement,
temperature measurement, continuity
checking, low battery detection, auto-
power off, re-power on, and RS232 data
output.
Application
Digital Multimeter
1
11/01/05
3 1/2 CAP AUTO DMM
Pin Assignment
HOLD
RANGE
SLACDC
KEY
FC5
FC4
FC3
FC2
FC1
NC
C+
C-
NC
SDO
LBAT9
V-
V-
DGND
AGND
AGND
100
90
80
ES51982
NC
V+
V+
NC
CL+
CL-
CIL
CAZL
BUFL
IVSH
IVSL
OVX
OVH
OVSG
NC
OR1
VR5
VR4
VR3
VR2
TEST5
ACVL
ACVH
NC
ADI
NC
ADO
NC
VRH
VR
1
10
70
20
60
30
40
50
NC
BKOUT
NC
XTAL
NC
OSC1
OSC2
NC
BUZOUT
BUZIN
NC
ANNUNC
BP1
BP2
BP3
BP4
SEG01
SEG02
SEG03
SEG04
SEG05
SEG06
SEG05
SEG07
SEG08
SEG09
SEG10
SEG11
SEG12
NC
NC
SEG13
SEG14
SEG15
SEG16
BKLIT
RS232
NC
FREQ
SLEEP
CA+
CA-
R1K
R9K
VBAR
NC
VR1
SGND
ADP
VA-
VA+
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11/01/05
3 1/2 CAP AUTO DMM
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
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47~50
ES51982
Symbol
NC
V+
V+
NC
CL+
CL-
CIL
CAZL
BUFL
IVSH
IVSL
OVX
OVH
OVSG
NC
OR1
VR5
VR4
VR3
VR2
TEST 5
ACVL
ACVH
NC
ADI
NC
ADO
NC
VRH
VR
VA+
VA-
ADP
SGND
VR1
NC
VBAR
R9K
R1K
CA-
CA+
SLEEP
FREQ
NC
RS232
BKLIT
Type
P
P
IO
IO
O
O
O
I
I
I
I
I
O
O
O
O
O
I/O
O
O
I
O
O
I
I
Description
Positive supply voltage, output of on-chip DC-DC converter.
Positive supply voltage, output of on-chip DC-DC converter.
High resolution positive connection for reference capacitor.
High resolution negative connection for reference capacitor.
High resolution integrator output. Connected to integral capacitor
High resolution auto-zero capacitor connection.
Integral resistor connection for high resolution buffer output
High current measurement input.
Low current measurement input
Input high voltage for resistance measurement
Output connection for resistance measurement
Sense low voltage for resistance measurement
Reference resistor connection for 200.0Ω
range
Voltage measurement ÷10000 attenuator(2000V)
Voltage measurement ÷1000 attenuator(200.0V)
Voltage measurement ÷100 attenuator(20.00V)
Voltage measurement ÷10 attenuator(2.000V)
Test pin
Negative output of AC to DC converter
Positive output of AC to DC converter.
Negative input of internal AC to DC Opamp.
Output of internal AC to DC Opamp.
Output of band-gap voltage reference .Typically –1.2V
Reference input voltage connection. Typically –100mV
For ADP. Deintegrating voltage positive input. The input should
be higher than VA-.
For ADP. Deintegrating voltage negative input. The input should
be lower than VA+.
ADP input
Signal Ground
Measurement input
In capacitance mode, a compensation capacitance is connected
In temperature mode, it is used to control decimal point. See page
Connect
to a 9KΩ resister for capacitor measurement.
Connect to a 1KΩ resister for capacitor measurement.
Negative auto-zero capacitor connection for capacitor measurement
Positive auto-zero capacitor connection for capacitor measurement
Asserts low in the sleep mode. See page 9, function description
Frequency counter input, offset V-/2 internally by the chip.
Pulse low to enable serial data output.
Back light function. Pulse low to set BKOUT pin output
LCD segment line 16~13
3
11/01/05
I
G
I
I
O
O
IO
IO
O
I
I
I
O
SEG16~SEG13
3 1/2 CAP AUTO DMM
…continued from previous page
NC
51
NC
52
53~64
SEG12~SEG01
O
65
BP4
O
66
BP3
O
67
BP2
O
68
BP1
O
69
ANNUNC
O
LCD segment line 12~01
LCD backplane 4
LCD backplane 3
LCD backplane 2
LCD backplane 1
Square wave output at the backplane frequency, synchronized to
BP1. ANNUNC can be used to control display annunciator. Con-
nect an LCD segment to ANNUNC to turn it on; connect an LCD
segment to its backplane to turn it off.
Enables the buzzer. Low active.
Outputs an 2KHz audio frequency signal for driving piezoelectric
buzzer when BUZIN is low.
Crystal oscillator output connection
Crystal oscillator input connection
The chip uses internal RC oscillator if pin is connected to V-, and
uses external crystal oscillator if this pin is floating or connected to
DGND
If BKLIT function is enabled, this pin will change from –3V to +3V
for 60 sec, once press BKLIT pin again within 60 sec, this pin will
change back to –3V.
Pulse low to enable HOLD mode.
Pulse low to enable manual mode and manual range selection.
Select AC/DC initial state. This pin is pull low
Pulse low to change mode. In ADP mode, if this pin is connected to
V-, the buzzer output will be off when the ADP input overflows.
Switch 5 for function selection.
Switch 4 for function selection.
Switch 3 for function selection.
Switch 2 for function selection.
Switch 1 for function selection.
Positive capacitor connection for on-chip DC-DC converter.
Negative capacitor connection for on-chip DC-DC converter.
RS232 compliant serial data output.
Low battery configuration. If 3V battery is used, connect it to AGND.
The default low-battery threshold voltage is –2.3V. If 9V battery is
used, the low battery annunciator is displayed when the voltage of
this pin is less than VRH (-1.2V)
Negative supply voltage. Connecting to battery negative terminal.
Negative supply voltage. Connecting to battery negative terminal.
Digital ground, connected to battery positive terminal.
Analog ground.
Analog ground.
ES51982
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
NC
BUZIN
BUZOUT
NC
OSC2
OSC1
NC
XTAL
NC
BKOUT
NC
HOLD
RANGE
SLACDC
KEY
FC5
FC4
FC3
FC2
FC1
NC
C+
C-
NC
SDO
LBAT9
I
O
O
I
I
O
I
I
I
I
I
I
I
I
I
O
O
O
I
96
97
98
99
100
V-
V-
DGND
AGND
AGND
P
P
G
G
G
4
11/01/05
3 1/2 CAP AUTO DMM
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
ES51982
-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- = -3V
Parameter
Power supply
Operating supply current
In DCV mode
Voltage roll-over error
Voltage nonlinearity
Input Leakage
Low battery flag voltage
Zero input reading
Reference voltage and open
circuit voltage
for 200Ω
measurement
Peak to peak backplane
drive voltage
Counter time base period
Open circuit voltage for
Ω
measurement (except 200Ω)
Symbol
Test Condition
V-
I
DD
Normal operation
I
SS
In sleep mode
REV
NLV
10MΩ input resistance
Best case straight line
V- to AGND
10MΩ input resistance
100KΩ resistor
between VRH and
AGND
-3.5V
≤
V
≤
-2.2V
f
OSC
= 4MHZ
Ω
and Continuity
Mode
Between V- pin and
HOLD, RANGE,
KEY, FC1, FC2,
FC3, FC4, FC5,
XTAL, BKLIT
Between V- pin
and RS232
Between GND Pin and
SLACDC
±1%
±5%
Min.
-3.5
—
—
—
—
-10
-2.5
-000
-1.3
3.00
—
-0.54
Typ.
-3.0
0.9
2.5
—
—
1
-2.3
000
-1.2
3.2
1
-0.47
Max
-2.2
1.4
5
±0.1
±0.1
10
-2.1
+000
-1.1
3.40
—
-0.4
Units
V
mA
µA
%F.S
%F.S
PA
V
counts
V
V
sec
V
V
REF
Internal pull-high to 0V
current
—
1.2
—
µA
—
µA
—
—
HZ
—
11
1.5
Internal pull-low to V-
current
AC frequency response at
2.000V range
—
—
40-400
40-2000
5
11/01/05
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