ES51969
6,600 Counts Auto DMM
• Auto power off (30min/15min)
Features
• Sleep state indicative signal output
• 6,600 counts LCD display
• Re-power on
• 100L QFP package
• On-chip buzzer driver
• 3V DC power supply
• Low battery detection for 3V or 9V battery
• Conversion rate : 3 times/s
• Full automatic measurement
Description
*Voltage measurement: 660.0mV – 1000V
ES51969 is an integrated analog-to-digital
converter (ADC) with 6,600 counts LCD
*Resistance measurement: 660.0Ω – 66.00MΩ
display, automatic range selection, and 3V DC
*Capacitance measurement: 6.600nF –
66.00mF(6.6sec) (Taiwan patent no.: 453443)
power supply. Automatic range selection is
*Frequency counter: 660.0Hz – 66.00MHz
provided for voltage (AC/DC) measurement,
Current modes for clamp meter with ZERO
resistance measurement, current measurement,
function
capacitance measurement, and frequency
Duty cycle measurement: 10.0% – 94.9% (0.66sec)
counter. Expensive and bulky mechanical
Diode measurement
range switches are not required. Other features
Continuity check
include inrush function, relative value display,
4 ADP modes with external reference voltage and
zero feature for DCA clampmeter, VAHZ
independent “ADP” segment on LCD panel
data holding, maximum and
Temperature mode with internal scale translation function,
circuit from 0C to 0F
minimum value holding, duty cycle
Push functions:
measurement, diode measurement, temperature
*KEY function
measurement, continuity checking, low battery
*Range change function
detection, auto power off, re-power on,
*Inrush function: ACA for clampmeter only
backlight driver, buzzer driver and RS232 data
*Relative function
output.
*Current measurement: μA/mA/A
•
•
•
•
•
•
•
*Zero function: DCA for clampmeter only
*VAHz function (Taiwan patent no.: 510502)
*Data hold function
*MAX/MIN function
*Back light function
• High crest factor signal detection
(Taiwan patent no. 234661)
• Band-gap reference voltage output
• OL/UL state indicator in ADP modes.
• CE selection (DC/AC 1010V, DC/AC 610V)
• Serial data output (RS232 format)
• LCD segment check when power on
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1
10/09/27
Application
Digital multimeter
Clamp meter
Thermometer
55
Cyrustek.
com.tw
40
35
25
20
15
5
10
ES51969
95
45
30
90
100
60
65
70
75
85
50
SEG14
SEG15
SEG16
SEG17
APOSEL
BKLIT
DSHIFT
RS232
FREQ
SLEEP
OHMC2
CSHCSH+
CA+
CAR1K
R9K
VBAR
VR1
OHMC1
V+
CREF+
CREFCINT
CAZ
BUFF
RAZ
IVSH
IVSL
OVX
OHMC
OVH
OVSG
OR1
VR5
VR4
VR3
VR2
TEST5
ACVL
ACVH
ADI
ADO
ADOHZ
VRH
VR
VA+
VAADP
SGND
REL
HOLD
RANGE
CESEL
BKSET
KEY
SLACDC
FC5
FC4
FC3
FC2
FC1
LBAT9
SDO
CC+
VDGND
AGND
AGND
80
VAHZ
MAX/MIN
VST
OSC2
OSC1
BKOUT
R_OVH
ENIR
ZERO
BUZIN
OR
BUZOUT
ANNUNC
BP1
BP2
BP3
BP4
SEG01
SEG02
SEG03
SEG04
SEG05
SEG06
SEG07
SEG08
SEG09
SEG10
SEG11
SEG12
SEG13
Pin Assignment
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10/09/27
Pin Description
Pin No
Symbol
Type
8
9
10
11
12
13
14
15
16
17
18
19
20
IVSH
IVSL
OVX
OHMC
OVH
OVSG
OR1
VR5
VR4
VR3
VR2
TEST5
ACVL
I
I
I
O
I
I
O
O
O
O
O
I/O
O
21
ACVH
O
22
23
24
25
26
27
ADI
ADO
ADOHZ
VRH
VR
VA+
I
O
I
O
I
I
28
VA-
I
29
30
31
32
33
ADP
SGND
OHMC1
VR1
VBAR
I
G
O
I
I
34
35
36
37
38
39
40
41
42
43
44
R9K
R1K
CACA+
CSH+
CSHOHMC2
SLEEP
FREQ
RS232
DSHIFT
O
O
I/O
I/O
O
O
O
O
I
I
I
45
BKLIT
I
1
2
3
4
5
6
7
v2.61
V+
CREF+
CREFCINT
CAZ
BUFF
RAZ
O
I/O
I/O
O
I
O
O
Description
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.
High current measurement input.
Low current measurement input
Input high voltage for resistance measurement
Filter capacitor connection for resistance mode below 6.600MΩ range.
Output connection for resistance measurement
Sense low voltage for resistance measurement
Reference resistor connection for 660.0Ω range
Voltage measurement ÷10000 attenuator(1000V)
Voltage measurement ÷1000 attenuator(660.0V)
Voltage measurement ÷100 attenuator(66.00V)
Voltage measurement ÷10 attenuator(6.600V)
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 of
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 band-gap voltage reference. Typically –1.2V
Reference input voltage connection. Typically –400mV
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.
Filter capacitor connection for resistance mode under 660.0KΩ range.
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, pull to V- to disable the ‘µ2’ or ‘m2’ sign on LCD.
Connect to a precise 9KΩ resister.
Connect to a precise 1KΩ resister.
Negative auto-zero capacitor connection for capacitor measurement
Positive auto-zero capacitor connection for capacitor measurement
Positive connection to external capacitor.
Negative connection to external capacitor.
Filter capacitor connection for 6.600MΩ range in resistance mode.
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.
Pull to V- to have 0.01MΩ resolution in 66.00MΩ.
Pull to DGND or keep it float will change the resolution to 0.1MΩ.
Back light function. Pulse low to set BKOUT pin output.
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10/09/27
46
APOSEL
47 - 63 SEG17 – SEG01
64
BP4
65
BP3
66
BP2
67
BP1
68
ANNUNC
69
BUZOUT
70
OR
71
72
73
74
75
BUZIN
ZERO
ENIR
R_OVH
BKOUT
76
77
78
OSC1
OSC2
VST
79
80
81
82
83
84
85
86
MAXMIN
VAHZ
REL
HOLD
RANGE
CESEL
BKSET
KEY
87
88
89
90
91
92
93
SLACDC
FC5
FC4
FC3
FC2
FC1
LBAT9
94
95
96
97
98
99 - 100
SDO
C+
CVDGND
AGND
v2.61
I
O
O
O
O
O
O
Auto power off idle time selection.
LCD segment line 01 – 17
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.
O Outputs a 2KHz audio frequency signal for driving piezoelectric buzzer
when BUZIN is low.
O OL/UL state indicator in ADP modes. Origin state is low(V-), it goes to
high(DGND) only when the reading is over 6,600 counts. It comes
back to low only when the reading is less than 600 counts. It will keep
the state when the reading is between 600 and 6600 counts.
I
Pull to V- to enable the BUZOUT.
I
Pulse to V- to enable ZERO function.
I
Pull to V- to enable the INRUSH function.
I
Pull to V- to allow protection resistance increasing at OVH path
O 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.
I
Crystal oscillator input connection
O Crystal oscillator output connection
I
Set to V- to enable the auto range voltage mode to start from 660.0V
range.
I
Pulse to V- to enable MAX/MIN function.
I
Pulse to V- to enable VAHZ mode.
I
Pulse to V- to enable Relative function.
I
Pulse to V- to enable HOLD function.
I
Pulse to V- to enable manual mode and manual range selection.
I
CE selection feature control pin.
I
Set to V- to change the backligh idle time from 60 sec. to 180 sec.
I
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.
In ACA modes for Clampmeter (FC5=low), pulse low to V- could
enable Inrush function.
I
Select initial state. Please refer to page 14
I
Switch 5 for function selection.
I
Switch 4 for function selection.
I
Switch 3 for function selection.
I
Switch 2 for function selection.
I
Switch 1 for function selection.
I
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)
O RS232 compliant serial data output.
O Positive capacitor connection for on-chip DC-DC converter.
O Negative capacitor connection for on-chip DC-DC converter.
P
Negative supply voltage. Connecting to battery negative terminal.
P/G Digital ground. Connecting to battery positive terminal.
P/G Analog ground.
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10/09/27
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 and open circuit
voltage for 660Ω measurement
Symbol
Test Condition
VIDD
Normal operation
ISS
In sleep mode
REV 10MΩ input resistor
NLV
Best case straight
line
VREF
V- to AGND
10MΩ input resistor
100KΩ resistor
between VRH and
AGND
-3.5V≤ V ≤-2.2V
Peak to peak backplane
drive voltage
Counter time base period
Open circuit voltage for Ω
measurement (except 660Ω)
Internal pull-high to 0V
current
Internal pull-low to Vcurrent
AC frequency response at 6.600V
range
Reference voltage temperature
coefficient
v2.61
TCRF
fOSC = 4MHZ
Ω and Continuity
Mode
Between V- pin and
HOLD, RANGE,
KEY, FC1, FC2,
FC3, FC4, FC5,
BKLIT,MAXMIN
Between V- pin
and RS232
Between GND Pin
and SLACDC
±1%
±5%
100KΩ
resister
Between
VRH
0℃<TA<70℃
5
Min.
-3.5
—
—
—
Typ.
-3.0
1.9
2.5
—
Max
-2.2
2.2
5
±0.1
Units
V
mA
µA
%F.S1
—
—
±0.1
%F.S
-10
-2.4
-000
1
-2.3
000
10
-2.2
+000
PA
V
counts
-1.3
-1.2
-1.1
V
3.1
3.2
3.3
V
—
1
—
sec
-0.86
-0.78
-0.70
V
—
1.2
—
—
11
—
1.5
µA
µA
—
—
40-400
400-2000
—
—
HZ
—
50
—
ppm/℃
10/09/27
-1.5
—
1.5
%F.S
-3
—
3
digits
2
Capacitance measurement
accuracy
6.6nF – 66mF
Note:
1.Full Scale
2.Above specification from 6.6nF to 6.6uF ranges are specified under REL mode.
Function Description
1. Operating Modes
1.1 Voltage Measurement
A re-configurable voltage divider automatically provides a suitable range in voltage
measurement mode. The following table summarizes the full-scale ranges in each
configuration.
Configuration
VR1
VR2
VR3
VR4
VR5
Full Scale Range
660.0mV1
6.600V
66.00V
660.0V2
1000V
Divider Ratio
1
1/10
1/100
1/1000
1/10000
Resister Connection
VR1 (10MΩ)
VR2 (1.111MΩ)
VR3 (101KΩ)
VR4 (10KΩ)
VR5 (1KΩ)
Note:
1.
660.0mV range only exists in manual mode
2.
If VST is set to V- level, the auto range mode will start from 660.0V range. 660.0mV – 66.00V
ranges only exist in manual mode.
1.1.2 CE selection
ES51969 has a CE selection feature archived by configuring a CESEL pin. If pin
CESEL is connected to V-, ES51969 will have a 610.0V overflow level in DC and AC
660.0V ranges. And the 1000V range will not occur anymore. If pin CESEL is
connected to DGND or floating, the ES51969 will have a 1010V overflow level in DC
1000V range and have a 1010V overflow level in AC 1000V range. The meter will
Show OL when the measuring signal reaches the overflow level. The configuration of
CESEL is listed below.
CESEL
DGND or floating
Vv2.61
DCV
1010V
610.0V
6
ACV
1010V
610.0V
10/09/27
1.1.3 HCF signal detection
ES51969 provides detection of high-crest-factor (HCF) signal in ACV mode. ES51969
senses the signal and determines it as HCF if the Vpp is large enough. Once the signal
is determined as HCF, ES51969 will jump up one measuring range regardless of current
measurement value. It takes 60ms to jump one range up. The jumping up process will
continue until the maximum range is reached. With HCF detection, a more accurate
result could be obtained. For example, when a input signal with Vpp=300V,
Vrms=60V(CF=5) was applied, traditional DMMs might stay at 66V range but shows
counts with the amount of error up to 10% or even bigger. The error rises from limited
input/output swing at internal ADC. With HCF detection, DMM will stay at 660V range
and exhibits more accurate results.
In addition to accuracy improvement, HCF will speed up the measuring process for
high voltage signals. For example, a 1000Vrms is applied, ES51969 will take about
180ms (3 HCF jumps) to enter 1000V range. And it takes 1 or 2 measuring processes to
obtain the stable result. Thus a stable LCD reading could be obtained within 1 sec.
In determining whether the input signal is HCF, ES51969 senses the signal at VR1 for
fast response. However if a signal consists of a small ac part and a large enough dc part,
ES51969 might incorrectly treat it as HCF. This could incur range-looping phenomenon,
i.e., the measurement could not settle to a specific range. When this phenomenon
happens and keeps over 5 seconds, ES51969 will change the UL level to 460 or lower
counts (the default UL level is 500 counts in ACV mode). The measurement range will
stay at the higher one mostly, so the range-looping phenomenon will not occur again.
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1.1.4 The true RMS-to-DC conversion with ES636
If ES636 is used for true RMS-to-DC measurement, the test circuit is shown in Figure 1.
Make ADO and ADI pin short, and keep TEST5 pin float. Connect OVSG pin to
AGND through a switch in ACV measurement mode.
10K
10K
ES636
-Vs
4
4.7u
+
1
2
3
4
5
6
7
ES51969
-Vs +Vs
5K
4.7u
OVSG
OR1
VR5
VR4
VR3
VR2
TEST5
ACVL
99.5
1K
10K
101K
1.111M
ACV
10K
2
+Vs
14
13
12
11
10 100
9
8
1K +Vs
3
7
TL061
6
1 100K
N2
N1
1.5K
-Vs
+Vs
1M
100K
500K
3.3u
+
-Vs
ACVH
5
0.47u
ADOHZ
-Vs
ADI
ADO
AGND
Figure 1. The true RMS-to-DC conversion with ES636
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1.2 Resistance Measurement
A re-configurable divider automatically provides a suitable full-scale range in resistance
measurement mode. The following table summarizes the full-scale ranges and the
reference resistors in each configuration. In 66MΩ range, the resolution is 0.1MΩ, if
SHIFT is floating or connected to DGND. It will be changed to 0.01MΩ, if DSHIFT is
pulled to V-.
Configuration
OR1
OR2
OR3
OR4
OR5
OR6
Full Scale Range
660.0Ω
6.600KΩ
66.00KΩ
660.0KΩ
6.600MΩ
66.00MΩ
Relative Resistor
OR1
VR5
VR4
VR3‖VR1
VR2‖VR1
VR1
Equivalent value
100Ω
1KΩ
10KΩ
100KΩ
1MΩ
10MΩ
1.3 Current measurement for multimeter
ES51969 has 2 automatic and 1 manual current measurement modes for multimeter.
The following table summarizes the full-scale range of each mode. When ES51969
operates in the current measurement modes for multimeter, It takes high input from pin
IVSH or IVSL, low input from pin SGND and reference voltage from pin VR.
2
VBAR
Mode
FC1~4
Full Scale
Input Terminal
Automatic1
1,1,0,1
1
660.0µA / 6600µA 3IVSL/IVSH V.S. SGND
Automatic2
1,1,1,1
1
66.00mA / 660.0mA 3IVSL/IVSH V.S. SGND
Manual
0,0,0,0
X
66.00A
IVSH V.S. SGND
Note:
1. Connect VBAR to V- will disable the “µ2” / ”m2” symbol on LCD panel, so in the mV range of voltage
measurement, this pin must keep floating.
2. The typical connection of input terminal is as the schematic below:
Vin*
9R
100K
R
100K
IVSL
IVSH
*The voltage results from the current flows through resistors R and 9R. Its input range is up to 3.3Vrms.
1.4 Current measurement for clampmeter
ES51969 has 2 automatic and 4 manual current measurement modes for Clampmeter.
The following table summarizes the full-scale range of each mode. When ES51969
operate in the automatic mode1&2, it takes high input from IVSH/IVSL (higher
range/lower range), low input from SGND and reference voltage from VR. When
ES51969 operate in the manual mode1~4, It takes high input from ADP, low input from
SGND and reference voltage from VA+ and VA-.
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2
VBAR
Mode
FC1~4
Full Scale
Input Terminal
Automatic1
1,1,0,1
0
660.0A / 6600A
IVSL/IVSH V.S. SGND
Automatic2
1,1,1,1
0
66.00A / 660.0A
IVSL/IVSH V.S. SGND
Manual1
1,1,0,0
X
6.600A
ADP V.S. SGND
Manual2
1,0,0,0
X
66.00A
ADP V.S. SGND
Manual3
1,0,1,0
X
660.0A
ADP V.S. SGND
Manual4
1,0,0,1
X
6600A
ADP V.S. SGND
Note:
1. Connect VBAR to V- will disable the “µ2” / ”m2” symbol on LCD panel, so in the mV range of voltage
measurement, this pin must keep floating.
2. In DC current modes for clampmeter, ES51969 provides Zero function for offset removing.
3. In AC current modes for clampmeter and FC5 is set to low, ES51969 provides an Inrush function to
measure the inrush current of a motor when it’s starting up.
4. The typical connection of input terminal is as the schematic below:
Vin*
IVSL
9R
RL
R
IVSH
*The voltage results from induced current flows through a load resistor. Its input range is up to 3.3Vrms.
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1.5 Capacitance Measurement
The following table summarizes the eight ranges of capacitance measurement mode.
Configuration
C1
C2
C3
C4
C5
C6
C7
C8
Full Scale Range
6.600nF
66.00nF
660.0nF
6.600uF
66.00uF
660.0uF
6.600mF
66.00mF
Relative Resistor
VR1
VR2
VR3
VR4
R9K / R1K
R9K / R1K
R9K / R1K
R9K / R1K
Measurement Period
0.33 sec
0.33 sec
0.33 sec
0.33 sec
0.66 sec
1.32 sec
1.32 sec
6.60 sec
Note:
1. In order to obtain an accurate reading, a capacitor must be discharged before measurement begins. The
chip has a built-in discharge mode to automatically discharge the capacitor. In discharge mode, the
LCD displays dIS.C
2. Discharging through the chip is quite slow. We recommend users to discharge the capacitor with some
other apparatus.
3. In capacitance mode for clamp-meter (FC1~4={0,1,1,0}, SLACDC=1), the C1~C3 ranges will not
occur whatever in the automatic or manual operation. When R_OVH (pin74) is pulled to V- in this
mode, the charging current for 660uF-6.6mF is reduced. The 66.00mF range will be omitted.
OVH path resistance is allowed to be increased. (For better high voltage protection)
.
1.6 Continuity Check
Continuity check shares the same configuration with 660.0Ω manual resistance
measurement mode and has buzzer output to indicate continuity. The buzzer generates
2KHz beep whenever the reading is less than 30Ω. When R_OVH (pin74) is pulled to
V- in this mode, the buzzer generates 2kHz beep when ever the reading is less than
50Ω.
1.7 Diode Measurement
Diode measurement mode shares the same configuration with 6.600V manual voltage
measurement mode and has buzzer output to indicate continuity. The buzzer generates a
2KHz sound whenever the reading is less than 30mV. If the test circuit is open or the
voltage drop between the two ports of the device(diode) under test is larger than 2V, the
LCD panel will show “OL”.
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11
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1.8 Frequency counter
The time base of the frequency counter is derived from an external crystal oscillator by
Tcounter =
4,000,000
Fosc
where Fosc is the frequency of the crystal oscillator. Thus, the counter has a 1-second
time base when a 4MHz oscillator is used. The frequency counter can select the proper
range automatically or manually. Auto-range operation extends over six decades, from
660.0Hz to 66.00MHz. The following table summarizes the full-scale range of the
frequency counter.
Range
FR1*
FR2
FR3
FR4
FR5
FR6
Full Scale
660.0Hz
6.600KHz
66.00KHz
660.0KHz
6.600MHz
66.00MHz
*If input frequency is less than 10.0Hz, ES51969 will show 00.0Hz.
1.9 Duty cycle measurement
In frequency mode, press the VAHZ bottom will force ES51969 enter duty cycle
measurement mode. The duty cycle measurement mode takes high input from FREQ
pin, and low input from SGND pin. The annunciator “%” on LCD panel indicates
whether the duty cycle measurement mode is activated. When the duty cycle is less
than 10.0%, the LCD panel shows UL and the UL bit of RS232 data becomes high.
When the duty cycle is more than 94.9%, the LCD panel shows OL and the OL bit of
RS232 data becomes high. If the frequency of input signal is less than 10.0Hz, the LCD
panel also shows UL and the UL bit of RS232 data becomes high. ES51969 also
provides a single duty cycle mode, which FC1~FC4 = {1,1,1,0}, as an independent
rotary switch for the meters without a frequency mode configured.
1.10 Temperature measurement mode
Temperature measurement mode takes input signal from ADP pin and reference voltage
from (VA+ - VA-). ES51969 has a built-in ºC-to-ºF scale translation circuit, and only
needs an external ºC scale application circuit. The application circuit for ºF scale is not
required. In temperature measurement mode, the default range is 6600 ºC or ºF. The
VBAR pin is used to control the first decimal point (DP1) on the LCD panel. When
VBAR is pulled to V-, DP1 will be turned on and the full scale becomes 660.0 ºC or ºF.
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1.11 Auto power off and Idle Time selection
ES51969 has a default auto power off function. If the meter is idle for more than the
given Idle Time, the chip automatically turns the power off. The idle time to trigger the
auto power off function is determined by pin ‘APOSEL’. If pin APOSEL is connected
to V-, the Idle Time will be set to 15 minutes. If pin APOSEL is connected to DGND or
floating, the Idle Time will be set to 30 minutes. When APO happens, the state of the
meter is saved. The APO sign on the LCD panel indicates whether the auto power off is
enabled or not. In some cases, user might want to disable Auto power off. There are two
ways to disable this feature as following:
1. Power on the meter when any of the push functions, except for HOLD, is pressed
down.
2. In addition, when RS232 output is active, the auto power off function is also
disabled.
Note: Powering on the meter while pressing HOLD and lasts 2 seconds turns on all
LCD segments until HOLD is pressed again.
1.12 Sleep
The meter enters sleep mode after auto power off. The SLEEP pin asserts low (-3V) in
the sleep mode, and asserts high (+3V, not 0V) after re-power on.
1.13 Re-power on
After auto power-off, pushing any of the push function or changing the rotary mode can
turn on the meter again. If the meter is re-powered on by changing the rotary mode, the
saved state is cleared. If the meter is re-powered on by push functions, the chip restores
the saved state and enters HOLD mode. The LCD displays the saved value.
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2. Measurement Mode Switching
Measurement mode depends on the logic level of SLACDC, FC1, FC2, FC3, FC4, FC5,
and KEY. When FC5 is high, the measurement mode list is below.
SLACDC
0
0
0
0
X
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
X
FC1
1
1
1
0
1
1
1
1
1
0
0
0
0
0
0
1
1
1
0
1
1
1
1
0
0
0
0
0
0
0
FC2
0
1
1
0
1
1
0
0
0
0
0
1
0
1
1
0
1
1
0
1
0
0
0
0
0
1
0
1
1
1
FC3
1
0
1
0
1
0
0
1
0
1
0
1
1
1
0
1
0
1
0
0
0
1
0
1
0
1
1
1
0
0
FC4
1
1
1
0
0
0
0
0
1
1
1
1
0
0
0
1
1
1
0
0
0
0
1
1
1
1
0
0
0
1
Mode
Voltage Measurement
123
Auto DC Current Measurement(µA)
123
Auto DC Current Measurement(mA)
1
66A DC Current Measurement(A)
Duty Cycle Measurement
2
Manual DC 6.600A
2
Manual DC 66.00A
2
Manual DC 660.0A
2
Manual DC 6600A
Resistance Measurement
Continuity Check
Resistance Measurement
Frequency Measurement
Capacitance Measurement
Temperature Measurement
Voltage Measurement
123
Auto AC Current Measurement(µA)
123
Auto AC Current Measurement(mA)
1
66A AC Current Measurement(A)
2
Manual AC 6.600A
2
Manual AC 66.00A
2
Manual AC 660.0A
2
Manual AC 6600A
*ADP0
*ADP1
*ADP2
*ADP3
Capacitance Measurement (Clamp)
Temperature Measurement
Resistance Measurement
X means “don’t care”.
Function of KEY
DCV ↔ ACV
DCA ↔ ACA
DCA ↔ ACA
DCA ↔ ACA
—
DCA ↔ ACA
DCA ↔ ACA
DCA ↔ ACA
DCA ↔ ACA
Ω ↔ Continuity
Continuity ↔ Diode
Ω ↔ Continuity ↔ Diode
—
—
℃ ↔ ℉
ACV ↔ DCV
ACµA ↔ DCµA
ACmA ↔ DCmA
ACA ↔ DCA
ACA ↔ DCA
ACA ↔ DCA
ACA ↔ DCA
ACA ↔ DCA
—
—
—
—
—
℉ ↔ ℃
Ω ↔ Diode
*When FC5 is high, the ADP0, ADP1, ADP2 and ADP3 modes can display minus sign.
1
These modes could be designed for multimeter current modes, please refer to section 1.3.
2
These modes could be designed for clampmeter current modes, please refer to section 1.4.
3
These modes could be designed for clampmeter 2-range automatic voltage modes, please refer to
section 1.5.
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When FC5 is low, the KEY bottom is used to enable Inrush function in ACA modes for
clampmeter. The measurement mode list is below.
SLACDC
0
0
0
0
X
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
X
FC1
1
1
1
0
1
1
1
1
1
0
0
0
0
0
0
1
1
1
0
1
1
1
1
0
0
0
0
0
0
0
FC2
0
1
1
0
1
1
0
0
0
0
0
1
0
1
1
0
1
1
0
1
0
0
0
0
0
1
0
1
1
1
FC3
1
0
1
0
1
0
0
1
0
1
0
1
1
1
0
1
0
1
0
0
0
1
0
1
0
1
1
1
0
0
FC4
1
1
1
0
0
0
0
0
1
1
1
1
0
0
0
1
1
1
0
0
0
0
1
1
1
1
0
0
0
1
Mode
DC Voltage Measurement
123
Auto DC Current Measurement(µA)
123
Auto DC Current Measurement(mA)
1
66A DC Current Measurement(A)
Duty Cycle Measurement
2
Manual DC 6.600A
2
Manual DC 66.00A
2
Manual DC 660.0A
2
Manual DC 6600A
Resistance Measurement
Continuity Check
Diode Measurement
Frequency Measurement
Capacitance Measurement
Temperature Measurement (℃)
AC Voltage Measurement
123
Auto AC Current Measurement(µA)
123
Auto AC Current Measurement(mA)
1
66A AC Current Measurement(A)
2
Manual AC 6.600A
2
Manual AC 66.00A
2
Manual AC 660.0A
2
Manual AC 6600A
*ADP0
*ADP1
*ADP2
*ADP3
Capacitance Measurement (Clamp)
Temperature Measurement (℉)
Resistance Measurement
KEY
－
－
－
－
－
－
－
－
－
－
－
－
－
－
－
－
4
Inrush function
4
Inrush function
－
Inrush function
Inrush function
Inrush function
Inrush function
－
－
－
－
－
－
－
X means “don’t care”.
*When FC5 is low, ADP0, ADP1, ADP2 and ADP3 modes can NOT display minus sign.
1
These modes could be designed for multimeter current modes, please refer to section 1.3.
2
These modes could be designed for clampmeter current modes, please refer to section 1.4.
3
These modes could be designed for clampmeter 2-range automatic voltage modes, please refer to
section 1.5.
4
In these modes, inrush function is available only when VBAR is pulled to V-.
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3. Push function
All the enabled push functions will be reset when the measurement mode is changed by
rotary switch. Change measurement mode by KEY function will reset enabled Range,
Hold, Max/Min, REL and Zero functions. The following table lists the available
function versus every measurement mode.
Function
Range
Hold
Max/Min
REL
Zero
VAHz
Inrush
O
O
O
O
X
O
X
O
O
O
O
X
O
X
O
O
O
O
X
O
X
O
O
O
AC
DC
AC
AC
Resistance
O
O
O
O
X
X
X
Frequency
O
O
O
O
X
X
X
Duty cycle
X
O
O
O
X
X
X
Capacitance
O
O
O
O
X
X
X
Continuity
X
O
O
O
X
X
X
Diode
X
O
O
O
X
X
X
Temperature
X
O
O
O
X
X
X
Mode
Voltage
1
2-Range Auto
Voltage mode
2
Current Mode
for Multimeter
3
Current Mode
for Clampmeter
Note:
1
Include auto 66.00V/660.0V and auto 660.0V/1000V modes, please refer to section 1.5.
2
Include automatic μA, automatic mA and manual 66A modes, please refer to section 1.3.
3
Include 2 automatic modes and 4 manual modes, please refer to section 1.4.
3.1 HOLD
HOLD mode makes the meter stop updating the LCD panel. This mode can be nested in
most of the special modes. Enabling HOLD function in automatic mode makes the
meter switch to manual mode, but the full-scale range remains the same. HOLD
function can be cancelled by changing the measurement mode, pressing RANGE, or
push HOLD again.
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3.2 Range
RANGE pin switches to and from automatic and manual mode, and while in manual
mode, changes the full-scale range. The following figure shows the state transition.
Automatic
Mode
1 push < 1 sec
Manual
Mode
1 push > 1 sec
Range up
1 push < 1 sec
Measurement Mode
Auto
V(DC/AC)
VR2 – VR5
Auto 66V/660V
(DC/AC)
R1 – R2
Auto 660V/1000V
(DC/AC)
R1 – R2
Auto µA(DC/AC)
R1 – R2
Auto mA(AC/DC)
R1－R2
66 A(DC/AC)
Auto 66A/660A
(DC/AC)
fixed
R1－R2
Auto 660A/6600A
(DC/AC)
R1－R2
Capacitance
C1 – C8
Clamp Capacitance
(When R_OVH is
floating)
Clamp Capacitance
(When R_OVH is
pulled to V-)
Manual
VRi → VRi + 1,
VR5 → VR1
R1 → R2,
R2 → R1
R1 → R2,
R2 → R1
R1 → R2,
R2 → R1
R1 → R2
R2 → R1
fixed
R1 → R2
R2 → R1
R1 → R2
R2 → R1
Ci → Ci + 1,
C8 → C1
Control Range
Initial Range
660.0mV – 1000V
6.600V
66.00V – 660.0V
66.00V
660.0V – 1000V
660.0V
660.0µA – 6600µA
660.0µA
66.00mA – 660.0mA
66.00mA
66.00A
66.00A
66.00A – 660.0A
66.00A
660.0A – 6600A
660.0A
6.600nF– 66.00mF
6.600nF
C4 – C8
Ci → Ci + 1,
C8 → C4
6.600µF – 66.00mF
6.600µF
C4 – C7
Ci → Ci + 1,
C7 → C4
6.600µF – 6.600mF
6.600µF
660.0Ω – 66.00MΩ
660.0Ω
660.0Ω
6.600V
660.0Ω
6.600V
660.0Hz – 66.00MHz
660.0Hz
Ω
OR1 – OR6
Continuity
Diode
fixed
fixed
Frequency
FR1 – FR6
ORi → ORi + 1,
OR6 → OR1
fixed
fixed
FRi → FRi + 1
FR6 → FR1
Note: Pushing RANGE resets all existing special modes.
3.3 KEY
See Section “Measurement Mode Switching” for the function of this pin.
In ACA modes for clampmeter, pulse low to V- could enable Inrush Function.
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REL + HOLD
In REL mode, the LCD panel displays DN+K - DN, where N = 1, 2, 3, … , DN is the last
value before REL is pushed, and DN+K is the current value. The meter returns to normal
operation if REL is pressed again. Pressing HOLD in REL mode makes the meter stop
updating the LCD panel.
push REL
Original State
(Auto/Manual)
push REL
push HOLD
〝REL〞active.
〝REL〞and〝H〞active.
The relative value
Hold the relative value
push HOLD
Note: It’s possible that the relative value exceeds 6,600 or –6,600 counts, but never
exceeds 9,999 or –9,999 counts. Such relative values are displayed. The LCD shows
OL in REL mode only if DN or DN+K is more than 6,600 counts or the relative value is
more than 9,999.
3.4 Max/Min + HOLD
The meter displays the maximum or minimum value of the input in Max/Min mode.
When Max/Min is pressed for the first time, the meter displays the maximum value.
The meter displays the minimum value, when it is pressed again. When Max/Min is
pressed for the third time, the meter displays current value. The meter returns to normal
operation if Max/Min is pressed and held for longer than one second. Pressing HOLD
in Max/Min mode makes the meter stop updating the maximum or the minimum value.
1 push<1s
Original state
(Automatic/manual)
1 push>1s
1 push>1 sec
1 push>1 sec
“MAX” active 1push<1s “MIN” active 1push<1s “Max” “MIN” blink
min value
current value
max value
Push HOLD
1push<1s
Push HOLD
Push HOLD
“MAX”“MIN” “H” blink
“MIN” “H” active
“MAX” “H” active
hold max value. 1push<1s hold min value. 1push<1s hold current value.
1push<1s
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3.5 Relative + Max/Min + HOLD
Max/Min mode can be nested in REL mode. The meter displays the maximum or
minimum value relative to the reference when Max/Min is pressed in REL mode.
Pressing HOLD under REL + Max/Min makes the meter stop updating the LCD panel.
Original State
(Auto/Manual)
Push REL
Push REL
〝REL〞active.
The relative value
Push Max/Min > 1s
Push Max/Min
〝REL〞and〝Max〞active.
〝REL〞and〝Min〞active.
〝REL〞〝Max〞〝Min〞
Maximum rel. value
Minimum rel. value
blink. Current rel. value
Push Max/Min
Push Max/Min
Push HOLD
〝REL〞,〝Max〞,
〝H〞active. Hold
max. rel. value
Push HOLD
Push HOLD
〝REL〞,
Push Max/Min
〝Min〞,
〝H〞active. Hold
min. rel. value
Push Max/Min
〝REL〞
〝Max〞
,
〝Min〞
,
,
〝H〞blink. Hold the
current rel. value
Push Max/Min
3.6 INRUSH function
ES51969 provides a INRUSH function for AC current measurement for
clampmeter to dectect the starting-up current of a motor. Connect pin ENIR to V-, or
the INRUSH function will be not available. In ACA modes for clampmeter and the FC5
is set to low, press KEY buttom will force meter to enter INRUSH mode. Then LCD
displays “- - - -“ until the motor starting up and being detected. The detection will be
done only one time and the output reading will be hold. When it done, press KEY could
enter INRUSH mode again.To exit INRUSH mode, press KEY buttom more than one
second. Enter INRUSH mode in automatic ACA modes will force the range be locked
in higher one. The test circuit and flow chart for inrush function is located at next pages.
Any change of the component value may have influence on the INRUSH characteristic.
So it’s not recommended to have any change on these component value. For INRUSH
function, an external true RMS-to-DC ES636 IC must be required.
v2.61
19
10/09/27
Press KEY>1sec
Normal
State
Press KEY
Inrush Mode Detected
Inrush Mode
”Wait for signal”
”LCD shows Reading”
Press KEY
Flow chart of Inruch function
100K
Vin
-400mV
-Vs +Vs
10K
10K
ES636
-Vs
1
2
3
4
5
6
7
2
3
+Vs
14
13
12
11
10 100
9
8
1K +Vs
7
TL061
6
ACVH
5
1 100K
N2
N1
1.5K
-Vs
+Vs
1M
100K
500K
3.3u
+
ES51969
4.7u
TEST5
ACVL
4
10K
VAVA+
5K
4.7u
+
ADP
0.47u
-Vs
ADOHZ
-Vs
ADI
ADO
AGND
Inrush function test circuit for manual current mode of clampmeter.
v2.61
20
10/09/27
Vin*
ES636
200
-Vs
IVSH
TEST5
ACVL
ACVH
+Vs
14
13
12
11
10 100
9
8
1K +Vs
+Vs
1M
100K
500K
2.2u
+
IVSL
ES51969
R
4.7u
+
1
2
3
4
5
6
7
9R
0.47u
-Vs
4.7u
ADOHZ
-Vs
ADI
ADO
AGND
*Input full-scale range is up to 3.3V rms.
Inrush function test circuit for 2-range automatic current mode of clampmeter
3.7 ZERO function
In manual DC 6.600A, 66.00A, 660.0A and 6600A, auto DC 66.00A/660.0A and auto
DC 660.0A/6600A mesurement modes, ES51969 provides Zero function to remove the
residual current value. Push ZERO bottom less than one second to enter Zero mode. In
Zero mode, the LCD panel displays DN+K - DN, where N = 1, 2, 3, … , DN is the last
conversion value before Zero is pushed, and DN+K is the current conversion value. If
Zero is pushed again in Zero mode, the meter will refresh the DN value and displays the
DN+K - DN again. The meter returns to normal operation if Zero is pressed and held for
longer than one second. Pressing HOLD in Zero mode makes the meter stop updating
the LCD panel. In 2-range auto DCA modes for clampmeter (660.0A/6600A or
66.00A/660.0A), the system will stay in automatic mode, even if the Zero function is
activated. In other words, It could achieve real automatic operation. In automatic mode,
Zero function could not be entered from higher range, but it could be still activated if
current range is lower one. This is because most residual current value is so small that
the range could not be higher one in automatic mode. When enter Zero mode from
v2.61
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lower range, the system will store the nonzero counts (residual current value). If the
range goes up to higher one automatically, the nonzero counts will be divided by ten.
So this function will still work well in automatic modes.
State diagram for Zero mode:
Original State
Press Zero
Press Zero > 1s
‘Zero’ Active
Press Zero < 1s
Show DN+K - DN
State diagram for Zero + HOLD mode:
Original State
Press Zero
Press Zero > 1s
‘Zero’ Active
Press Zero < 1s
Show DN+K - DN
Press Hold
‘Zero’ ‘Hold’ Active
Stop LCD upgrading
State diagram for Zero + Max/Min + HOLD mode:
Original State
(Auto/Manual)
Push Zero
Push Zero > 1s
‘Zero’ Active
Push Zero < 1s
Show DN+K - DN
Push Max/Min > 1s
Push Max/Min
‘Zero’ ‘Max’ Active
‘Zero’ ‘Min’ Active
〝Zero〞〝Max〞〝Min〞
Show Max. DN+K - DN
Show Min. DN+K - DN
blink. Current DN+K - DN
Push Max/Min
Push Max/Min
Push HOLD
Push HOLD
Push HOLD
〝Zero〞
〝Max〞
,
〝Min〞
,
,
‘Zero’ ‘Max’ ‘Hold’
‘Zero’ ‘Min’ ‘Hold’
〝H〞blink. Hold the
active Hold Max.
active Hold Min.
Push Max/Min
Push Max/Min
DN+K - DN Value
DN+K - DN Value
current DN+K - DN
Push Max/Min
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4. Serial Data Output
The RS232 function will be activated if the RS232 pin is pulled to and asserts at V-.
The serial data sent to SDO pin once every A/D conversion cycle. The data format
complies with JIS 7Bits transmission code with a baud rate of 19230. The host can use
RS232 interface to read the data. A single data packet includes a start bit (always 0), 7
data bits, an odd parity check bit, and a stop bit (always 1). The high and low voltage
levels correspond to DGND and V- respectively. SDO remains at 1 (high) when it is
inactive. Hence the start bit (0) could be used as the triggering signal to begin the
reading process. The following figure shows the data format of a single packet. The
LSB is sent first and the MSB is sent last.
single package
0V
-3V
0
D0 ~D6
LSB
p 1
P
MSB
One data block consists of 11 packets, or 110 bits. The following figure shows the
format of a data block. The range packet indicates the full scale range of the meter.
Digit 3 through digit 0 are just the digits on the LCD panel. The function packet
indicates the measurement mode of the meter. Status, option 1 and option 2 give the
status of the meter. CR and LF are delimiters used to separate the blocks.
all package
range
digit3
digit1
option2
p 1
p 1 0
0
p 1
p 1 0
option1
status
p 1
function
digit0
p 1 0
0
digit2
p 1 0
p 1 0
0
p 1
p 1 0
p 1 0
0
CR
LF
The meter always outputs the current input value to the serial port in spite of HOLD
v2.61
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mode. Each block is repeated twice in one conversion cycle. The detailed data format of
each packet is listed below.
4.1 FUNCTUON
This packet indicates the measurement mode of the meter. The following table
summarizes the transmitted code for each mode. Note that the encoding of this packet is
different from the encoding of FC1-FC5 switch.
Code
0111011
3
0111101
3
0111111
0110000
0111001
0110011
0110101
0110001
0110010
0110110
0110100
0111110
Measurement Mode
Voltage
Auto µA Current
Auto mA Current
66 A current
Manual A Current
Ω
Continuity
Diode
Frequency
Capacitance
2
Temperature
1
ADP/Duty
VBAR=0
Auto µA Current
Auto mA Current
Don’t care
VBAR=1
Auto 660.0A/6600A
Auto 66.00A/660.0A
Don’t care
1
When the function code = 0111110, the measurement mode is determined by judge bit of Status packet.
If judge bit is 1, it means duty cycle mode. If judge bit is 0, it means ADP mode.
2
When the function code = 0110100, the judge bit in the Status packet determines whether the unit is
Celsius or Fahrenheit.
3
When the function code = 0111101 or 0111111, the measurement mode is determined by VBAR bit of
OPTION1 packet.
4.2 RANGE
This packet indicates the full-scale range of the meter. When the meter operates in
continuity mode or diode mode, this packet is always 0110000 since the full-scale
ranges in these modes are fixed. The following table lists the code for each range in
each measurement mode.
Ω
Code
V
*2-range auto V/A
66 A Manual A ADP
Frequency Capacitor
0110000 6.600V Lower Range(IVSL) 66.00 A 6.600A ADP3 660.0Ω
660.0Hz
6.600nF
0110001 66.00V Higher Range(IVSH)
66.00A ADP2 6.600KΩ
66.00nF
0110010 660.0V
660.0A ADP1 66.00KΩ 6.600KHz 660.0nF
0110011 1000V
6600A ADP0 660.0KΩ 66.00KHz 6.600µF
0110100 660.0mV
6.600MΩ 660.0KHz 66.00µF
0110101
66.00MΩ 6.600MHz 660.0µF
0110110
66.00MHz 6.600mF
0110111
66.00mF
*It includes auto µA, mA, 66.00V/660.0V, 660.0V/1000V, 66.00A/660.0A, 660.0A/6000A.
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4.3 DIGIT 3 – DIGIT 0
Digit 3 is the most significant digit on the LCD panel, and digit 0 is the least significant
digit.
Digit
0
1
2
3
4
5
6
7
8
9
Code
0110000
0110001
0110010
0110011
0110100
0110101
0110110
0110111
0111000
0111001
Note: Because the cycle time of measurement for continuity/diode mode is only 82.5ms,
the least significant digit may not be accurate
4.4 STATUS
The format of this package shown below. In Temperature mode, judge is 1 if the unit is
°C and is 0 if the unit is °F. In ACA modes for clampmeter, the judge bit is 1 when the
INRUSH function is activated. Sign field indicates whether the minus sign on the LCD
panel is on or off. BATT field is one when battery low condition is true. OL indicates
input overflow. In VAHz mode, the judge is 1 if the duty cycle mode is active.
0
BIT6
1
BIT 5
1
BIT 4
Judge
BIT 3
Sign
BIT 2
BATT
BIT1
OL
BIT 0
1
BIT 5
1
BIT 4
UL
BIT 3
0
BIT 2
VBAR
BIT1
0
BIT 0
4.5 OPTION 1
0
BIT 6
The UL bit will be 1 only in following conditions:
1. The reading is less than 10.0Hz(LCD shows UL) in FR1 range of frequency mode.
2. The input frequency is less than 10.0Hz or the duty cycle value is less than 10.0% in
duty cycle measurement mode.
The VBAR bit will be 1, when the VBAR pin is connected to V-.
v2.61
25
10/09/27
4.6 OPTION 2
This packet contains information on the operation mode of the meter. The format is
shown below. The DC field indicates that the meter operates in DC measurement mode,
either voltage or current. The AC field indicates that the meter operates in AC
measurement mode, either voltage or current. The AUTO field is set to one if the meter
operates in automatic mode, and is set to zero when the meter operates in manual mode.
0
BIT 6
1
BIT 5
1
BIT 4
DC
BIT 3
AC
BIT 2
AUTO
BIT 1
VAHZ
BIT 0
4.7 CR
Carriage return. The transmitted code is 0001101.
4.8 LF
Line feed. The transmitted code is 0001010.
5. Miscellaneous
The conditions, which the meter turns on the buzzer, include:
(1) Changing measurement mode generates one beep.
(2) Pressing any of the push functions generates one beep, if the function is valid.
(3) Power on and re-power on generate one beep.
(4) Input overflow in voltage and current mode generates one beep every 0.3 seconds
(or 3.33 beeps per second.)
(5) Continuity(diode) check generates a continuous 2KHz beep whenever the
measurement is less then 30Ω(30mV)
(6) Auto power off generates a 2KHz beep which lasts for 1.5 seconds.
The following figures show the output waveform from the BUZOUT pin.
0.5 mS
(a) Continuous 2KHz beep
0.15 sec
0.3 sec
(b) 3.33 beep/sec
v2.61
26
10/09/27
5.1 LCD Panel
S17 S1
S2 S3
S4
S5
S6
S9
S7 S8 S15
S16
S13 S14
S10 S11 S12
%
AUTO MANU HOLD INRUSH REL MAX MIN ZERO
BP1 ADP0 APO
AC
BP2 ADP1
DC
BP3 ADP2 BATT
BP4 ADP3 RS232
℃℉
µ2 m2 V A
n µ1 m1 F
M K Ω Hz
SEG01 SEG02 SEG03 SEG04 SEG05 SEG06 SEG07 SEG08 SEG09
BP1 APO AUTO
A4 MANU A3
HOLD INRUSH
BP2
BP3 BATT
BP4 RS232
AC
DC
DP3
F4
E4
D4
B4
G4
C4
F3
E3
D3
B3
G3
C3
F2
E2
DP2
A2
G2
D2
B2
C2
DP1
SEG10 SEG11 SEG12 SEG13 SEG14 SEG15 SEG16 SEG17
BP1
A1
µ2
M
REL
n
ADP0
BP2
F1
B1
℃
m2
K
MAX
µ1
ADP1
BP3
E1
G1
℉
V
Ω
MIN
m1
ADP2
BP4
D1
C1
%
A
Hz
ZERO
F
ADP3
LCD Backplane Waveform
V- +3.2
V- +3.1
V-
V-
V- +3.2
V- +3.1
V-
V-
V- +3.2
V- +3.1
VV- +3.2
VV- +3.2
V-
v2.61
27
10/09/27
5.2 LCD display on condition
LCD Annunciator
V
A
Ω
F
%
Hz
ADP1
ADP2
ADP3
ADP4
DC
AC
AUTO
MANU
HOLD
REL
Max / Min
ZERO
INRUSH
m1
µ1
n
m2
µ2
M
K
℃
℉
APO
RS232
Condition
In voltage measurement mode, and diode measurement mode.
In current measurement mode.
In resistance measurement mode, and continuity mode.
In capacitance measurement mode.
In continuity check mode.
In diode mode.
In duty cycle measurement.
In frequency mode.
In ADP1 mode
In ADP2 mode
In ADP3 mode
In ADP4 mode
In DC voltage or DC current mode.
In AC voltage or AC current mode.
When automatic full scale range selection is enabled.
In manual mode.
When HOLD function is enabled.
When Relative function is enabled.
When Max or Min function is enabled.
When ZERO function is enabled.
When INRUSH function is enabled.
In capacitor measurement mode and the full scale range is in the order of mF.
In capacitor measurement mode and the full scale range is in the order of uF.
In capacitor measurement mode and the full scale range is in the order of nF.
In voltage or current measurement mode and the full scale range is in the order of 10-3.
In current measurement mode and the full scale range id in the order of uA.
In resistance measurement mode and the full scale range is in the order of MΩ
In resistance measurement mode and the full scale range is in the order of KΩ
In temperature measurement mode and when the unit is ℃
In temperature measurement mode and when the unit is ℉
When auto power off function is enabled.
When RS232 output is enabled.
5.3 Operating Timing
ES51969 incorporates a dual slope ADC with four phases: ZI, AZ, INT and DINT.
The timing of each phase are listed below.
*Voltage / Ohm /ADP / Manual Current (for clampmeter) measurement:
Phase
ZI
AZ
INT
DINT
Time
40ms
25ms
100ms
165ms
P.S. In the DC voltage and ohm measurement with auto mode, if the range is
changed, the internal clock rate will increase four times and the new measurement
cycle becomes 1/4 times of the original cycle until the range is stable.
*Current mode for multimeter / Auto Current mode for clampmeter / 2-range auto
v2.61
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10/09/27
voltage mode
Phase
ZI
AZ
INT
DINT
Time
40ms
25ms
100ms
82.5ms
*Continuity/Diode measurement
Phase
ZI
AZ
INT
DINT
Time
10ms
6.25ms
25ms
41.25ms
*Capacitance measurement:
Range
6.600nF
66.00nF
660.0nF
6.600μF
66.00μF
660.0μF
6.600mF
66.00mF
Total Measurement Time
0.33sec
0.33sec
0.33sec
0.33sec
0.66sec
1.32sec
1.32sec
6.6sec
*Duty cycle measurement
Every conversion takes 0.66 second.
*Frequency measurement
In 660.0Hz range, the measurement cycle = 0.25 ~ 0.5 sec
In range 6.6KHz~66MHz, the measurement cycle = 1.05 sec
P.S. In the frequency measurement with auto mode, if the range is changed, the
internal clock rate will increase ten times and the new measurement cycle
becomes 1/10 times of the original cycle until the range is stable.
v2.61
29
10/09/27
6. Test Circuit
1. Voltage test
4. Current test
AGND
OVSG
99.5
1K
10K
101K
1.111M
D2
D1 1.0u
0.47u
1.0u
OR1
VR5
VR4
VR3
VR2
ADO
88M
10K
15K
mA
4.5
A
uA
V
R
1
10K
V
R
mA
45
mA
AGND
SGND
10A
0.495
ADI
ACVL
ACVH
TEST5
0.1u
15K
0.005
100K
uA
uA
IVSL
5. Diode test
10M
AGND
-400mV
Voltage input
PTC
1.5K
OVH
100
Z1
6V
Z2
2. Resistor test
PTC
1.5K
VR1
10M
47n
300p
330n
220n
100
Z1
6V
Z2
99.5
1K
10K
101K
1.111M
IVSH
100K
450
OVX
OHMC
1.111M
OHMC1
VR2
OVSG
OHMC2
OVH
OVSG
OR1
VR5
VR4
VR3
VR2
6. Low battery
9V
BA
SGND
AGND
680K
TT
270K
LBAT9
0.1u AGND
V-
0V
3. Current test for clamp meter
8. Frequency test
7. ADP test
F
R
E
Q
VA+
VA-
-400mV
RL
VR
100K
R
+
Vref
v2.61
ADP
SGND
AGND
ADPin+
ADPin-
ADP
100K
SGND
AGND
VA+
200
2.2u
PTC
1.5K
Fin
VA30
10/09/27
7. Application Circuit
7.5V ZI
+ 10μ
0.1μ
D1
ADI
ADO
D2 0.47μ
ADOHZ
55K
+
27K
VR
VA+
VAADP
SGND (30)
VBAR
VR1
OHMC1
1μ
VRH (25)
10M
220n
100K Cp
330n
4M
V-
(50) SEG14
SEG15
SEG16
SEG17
APOSEL
(45) BKLIT
DSHIFT
RS232
FREQ
SLEEP
(40) OHMC2
CSH- 22n
CSH+
CA+ 470n
CA(35) R1K
R9K
10K
(80) VAHZ
MAX/MIN
VST
OSC2
OSC1
(75) BKOUT
R_OVH
ENIR
ZERO
BUZIN
(70) OR
BUZOUT
ANNUNC
BP1
BP2
(65) BP3
BP4
SEG01
SEG02
SEG03
(60) SEG04
SEG05
SEG06
SEG07
SEG08
(55) SEG09
SEG10
SEG11
SEG12
SEG13
LCD display
15K
15K 1μ
+ 88M
CREFCINT
CAZ (5)
BUFF
RAZ
IVSH
IVSL
OVX (10)
OHMC
OVH
OVSG
OR1
VR5 (15)
VR4
VR3
VR2
TEST5
ACVL (20)
ACVH
...
0.1μ
1μ +
CREF+
5.6V
10K
0.47μ
ES51969
R
C
220n
220n
mA
450k
4.5
150k
0.495 10A
100K
100K
0.005
100K
47n
300p
1.5K
100
PTC
99.5
1K
10K
101K
10K
1.111M
10μ
0.1μ
REL
HOLD
RANGE
CESEL
BKSET (85)
KEY
SLACDC
FC5
FC4
FC3 (90)
FC2
FC1
LBAT9
SDO
C- (95)
45
10A
0.1μ
mA
+
C+
V-
μA
450
mA
V+
V-
3V
DGND
AGND
AGND (100)
μA
μA
5.6V ZI
+
C
9K
200
220n
1K
2.2μ
1.5K
PTC
V1815
Notes:
Fin
1. Most of pins are protected by the ESD protection circuits. However pins, V+, V-, AGND, DGND and
VR1 are not protected enough because the parasitic effect must be decrease. Therefore enough external
protection is needed for assembling, carrying and keeping. In addition, components connecting to these
unprotected pins have to be soldered on board before the chip is soldered.
2. All the zener diodes above are used for IC protection. These protection are needed and these zener
diodes must be soldered on PCB first before soldering ES51969 on.
3. Cp is the compensation capacitor for measuring capacitance. Its value depends on the parasitic
capacitor on the PCB. (The recommended value is not less than the filter capacitor applied at OVX)
4. The capacitance value marked in red means that these capacitors must have good stability and low
leakage current, for example, the MKT type or even better quality ones.
v2.61
31
10/09/27
8. Package
1
100 Pin QFP Package
Title:
topview.eps
Creator:
fig2dev Version 3.2 Patchlevel 1
預覽:
此EPS圖片尚未將其
縮圖資料一併儲存。
註解:
此EPS圖片將列印至一
PostScript印表機， 而非
其他類型的印表機。
Title:
sideview.eps
Creator:
fig2dev Version 3.2 Patchlevel 1
預覽:
此EPS圖片尚未將其
縮圖資料一併儲存。
註解:
此EPS圖片將列印至一
PostScript印表機， 而非
其他類型的印表機。
2
Dimension Paramenters
Symbol
W
L
A
B
C
d
a
D
θ
v2.61
Min.
Milimeter
Typ. Max.
Min.
19.90 20.00 20.10 783.5
13.90 14.00 14.10 547.2
0.425
0.20 0.30 0.40
7.9
0.65
1.05 1.20 1.35 41.3
2.57 2.72 2.87 101.2
2.50
o
0
10o
32
Mill
Typ.
787.4
551.2
16.7
11.8
25.6
47.2
107.1
98.4
Max.
791.3
551.2
11.8
47.2
107.1
10/09/27