11,000 Counts Auto DMM
Features
•
11,000 counts LCD display
•
Conversion rate : 4 times/s
•
Full automatic measurement
*Voltage measurement:
110.00mV – 1000.0V
*Current measurement:
μA/mA/A
*Resistance measurement:
110.00Ω
–
110.0MΩ
*Capacitance measurement:
11.000nF – 110.00mF(12.5sec)
(Taiwan
patent no.: 453443)
*Frequency counter:
1.1000KHz – 110.00MHz
•
Current modes for clamp meter
•
Diode measurement
•
Continuity check
•
ADP mode with independent reference
voltage
•
Temperature mode with internal scale
conversion circuit from
0
C to
0
F
•
VAHZ function
(Taiwan
patent no.: 510502)
•
Relative function
•
Zero function in manual DCA mode
•
Data hold function
•
MAX/MIN function
•
SHIFT function
v1.2
ES51911
•
Band-gap reference voltage output
•
High crest factor signal detection
(Taiwan
patent no.: 234661)
•
CE selection
•
On-chip independent OPAMP
•
Serial data output (RS232 format)
•
LCD segment check when power on
•
Auto power off with idle time selection
•
Sleep output
•
Re-power on
•
On-chip buzzer driver
•
3V DC power supply
•
Low battery detection for 3V or 9V battery
•
Back light function
Description
ES51911 is an integrated analog-to-digital
converter (ADC) with 11,000 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, and frequency
counter. Expensive and bulky mechanical
range switches are not required. Other features
include relative value display, zero-offset
removing feature in manual DCA mode for
clampmeter, data holding, maximum and
minimum holding, diode measurement,
temperature measurement, continuity checking,
low battery detection, auto power off, re-power
on, and RS232 data output.
1
11/09/06
5
75
10
70
15
65
OSC1
OSC2
APOSEL
CESEL
BKLIT
KEY
SLACDC
FC5
FC4
FC3
FC2
FC1
LBAT9
SDO
C+
C-
V-
DGND
AGND
AGND
v1.2
95
90
85
80
Pin Assignment
Application
Digital multimeter
Clamp meter
Thermometer
100
ES51911
Cyrustek.
com.tw
2
60
55
35
40
45
50
20
V+
V+
CREF+
CREF-
CINT
CAZ
BUFF
RAZ
IVSH
IVSL
OVX
OVH
OVSG
OR1
VR5
VR4
VR3
VR2
TEST5
ACVL
ACVH
ADI
ADO
ADOHZ
OPO
OPIN+
OPIN-
PWD
VRH
VR
25
RANGE
HOLD
REL_ZERO
NC
VAHZ
MAX/MIN
BKOUT
BUZOUT
BUZIN
ANNUNC
BP1
BP2
BP3
BP4
SEG01
SEG02
SEG03
SEG04
SEG05
SEG06
SEG07
SEG08
SEG09
SEG10
SEG11
SEG12
SEG13
SEG14
SEG15
SEG16
NC
SEG17
OHMC3
OHMC2
RS232
FREQ
SLEEP
OHMC1
CA+
CA-
R1K
R9K
NC
NC
VBAR
VR1
SGND
ADP
VA-
VA+
11/09/06
Pin Description
Pin No
1
2
3
4
5
6
7
8
Symbol
V+
V+
CREF+
CREF-
CINT
CAZ
BUFF
RAZ
Type
O
O
I/O
I/O
O
I
O
O
I
I
I
I
I
O
O
O
O
O
I/O
O
O
I
O
I
O
I
I
I
O
I
I
I
I
G
I
I
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
v1.2
IVSH
IVSL
OVX
OVH
OVSG
OR1
VR5
VR4
VR3
VR2
TEST 5
ACVL
ACVH
ADI
ADO
ADOHZ
OPO
OPIN+
OPIN-
PWD
VRH
VR
VA+
VA-
ADP
SGND
VR1
VBAR
NC
NC
R9K
R1K
CA-
CA+
OHMC1
Output of on-chip DC-DC converter.
Output of on-chip DC-DC converter.
Positive connection for reference capacitor.
Negative connection for reference capacitor.
Integrator output. Connect to integral capacitor
Auto-zero capacitor connection.
Buffer output pin. Connect to integral resistor
Buffer output pin in high-speed mode. Connect to high-speed integral
resistor.
Current measurement input for 1100μA,
110mA and 11A modes.
Current measurement input for 110μA,
11mA.
Input high voltage for resistance measurement
Output connection for resistance measurement
Sense low voltage for resistance measurement
Reference resistor connection for 110.00Ω range
Voltage measurement ÷10000 attenuator(1000.0V)
Voltage measurement ÷1000 attenuator(110.00V)
Voltage measurement ÷100 attenuator(11.000V)
Voltage measurement ÷10 attenuator(1.1000V)
Test pin
DC signal low input in ACV/ACA mode. Connect to negative output
of external AC to DC converter.
DC signal high input in ACV/ACA mode. Connect to positive output o
external AC to DC converter.
Negative input of internal AC to DC OP Amp.
Output of internal AC to DC OP Amp.
Frequency input under voltage/current mode, offset to AGND.
Output of internal independent OP Amp.
Positive input terminal of on-chip independent OP Amp.
Negative input terminal of on-chip independent OP Amp.
Power-down enable for on-chip independent OP Amp.
Output of band-gap voltage reference. Typically –1.23V
Reference input voltage connection. Typically –100mV
For ADP mode. De-integrating voltage positive input. The input
should be higher than VA-.
For ADP mode. De-integrating voltage negative input. The input
should be lower than VA+.
Measurement input in ADP mode.
Signal Ground.
Measurement input.
In capacitance mode, a compensation capacitor is connected.
In temperature mode, it is used to control decimal point.
In µA or mA modes, it is used to control the ‘µ’ or ‘m’ sign.
Connect to a precise
9KΩ resister for capacitor measurement.
Connect to a precise 1KΩ resister for capacitor measurement.
Negative auto-zero capacitor connection for capacitor measurement
Positive auto-zero capacitor connection for capacitor measurement
Filter capacitor connection for resistance mode.
3
11/09/06
Description
O
O
I/O
I/O
O
44
SLEEP
45
FREQ
46
RS232
47
OHMC2
48
OHMC3
49
SEG17
50
NC
51 - 66 SEG16 – SEG01
67
BP4
68
BP3
69
BP2
70
BP1
71
ANNUNC
O
I
I
O
O
O
O
O
O
O
O
O
Sleep mode indicator, asserts low in SLEEP mode.
Frequency counter input, offset V-/2 internally by the chip.
Assert low to enable serial data output.
Filter capacitor connection for resistance mode.
Filter capacitor connection for resistance mode.
LCD segment line 17
LCD segment line 01 – 16
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. Connect a
LCD segment to ANNUNC to turn it on; connect an LCD segment to
its backplane to turn it off.
Pull to V- to enable the BUZOUT.
Outputs a 2KHz audio frequency signal for driving piezoelectric buzze
when BUZIN is low.
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 to V- to enable MAX/MIN function.
Pulse to V- to enable VAHZ mode.
Pulse to V- to enable Relative function or Zero function.
Pulse to V- to enable HOLD function.
Pulse to V- to enable manual mode and manual range selection.
Crystal oscillator input connection
Crystal oscillator output connection
Idle time selection for auto power off feature.
CE selection feature control pin.
Back light function. Pulse low to set BKOUT pin output.
Pulse to V- to change mode. In ADP mode, if this pin is connected to
V-, the buzzer output will be off when the ADP input overflows.
Select initial state. Please refer to page 13
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.
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)
RS232 compliant serial data output.
Positive capacitor connection for on-chip DC-DC converter.
Negative capacitor connection for on-chip DC-DC converter.
Negative supply voltage. Connecting to 3V battery negative terminal.
Digital ground. Connecting to 3V battery positive terminal.
Analog ground.
Analog ground.
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
BUZIN
BUZOUT
BKOUT
MAXMIN
VAHZ
NC
REL_ZERO
HOLD
RANGE
OSC1
OSC2
APOSEL
CESEL
BKLIT
KEY
SLACDC
FC5
FC4
FC3
FC2
FC1
LBAT9
I
O
O
I
I
I
I
I
I
O
I
I
I
I
I
I
I
I
I
I
I
94
95
96
97
98
99
100
SDO
C+
C-
V-
DGND
AGND
AGND
O
O
O
P
P/G
P/G
P/G
v1.2
4
11/09/06
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- = -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
Peak to peak backplane
drive voltage
Counter time base period
Open circuit voltage for 110Ω range
Open circuit voltage for
Ω
measurement (except 110Ω)
Internal pull-high to 0V
current
Internal pull-low to V-
current
AC frequency response at 1.1000V
range
Sensitivity in VAHZ mode
v1.2
V
REF
Symbol
Test Condition
V-
I
DD
Normal operation
I
SS
In sleep mode
REV 10MΩ
input resistor
NLV
Best case straight
line
V- to AGND
10MΩ input resistor
100KΩ resistor
between VRH and
AGND
-3.5V
≤
V
≤
-2.2V
f
OSC
= 4MHZ
Ω
and Continuity
Mode
Min.
-3.5
—
—
—
—
-10
-2.4
-000
-1.33
3.1
—
—
-0.38
Between V- pin and
HOLD, RANGE,
KEY, FC1~FC5,
BKLIT,MAXMIN
Between V- pin
and RS232
Between GND Pin
and PWN
±1%
±5%
Input from ADOHZ
Duty cycle=50%
5
Typ.
-3.0
1.8
2.5
—
—
1
-2.3
000
-1.23
3.2
1
-3.0
-0.34
1.2
11
1.5
—
—
600
40-400
400-2000
—
—
Max
-2.2
2.0
5
±0.05
±0.05
10
-2.2
+000
-1.13
3.3
—
—
-0.30
Units
V
mA
µA
%F.S
1
%F.S
pA
V
counts
V
V
sec
V
V
—
—
µA
—
µA
HZ
mV(Vpp)
11/09/06
—
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