Datasheet ES51988 Datasheet (CYRTK)

ES51988

3 3/4 AUTO REL/MAX/MIN

Features:

•Full Automatic measurement

•3 3/4 digits display

•Frequency measurement (40M HZ)

•Rotary or push setting mode

•Auto-power-off then hold the final data

•Rotary or push re-power on function

•Data hold, MAX/MIN hold, Relative
data when this function is pressed

•Low battery detect (3V & 9V)

•On chip buzzer driver

•3V DC power supply

•Internal AC to DC conversion OP AMP
If non_AC mode , OP will become unit

gain buffer.

•Serial Data Output (RS232 format)

•LCD segment check

•100 Pin flat-package

Description:

The ES51988 is an integrated analog­to-digital converter (ADC)with 3 3/4 digits
and 42-segment bargraph LCD display,
automatic range, and 3V battery power
supply.
Automatic range selection is provided
for voltage (AC/DC) measurement, ohm
measurement, current(uA and mA)
measurement,and frequency counter. The
ES51988 also provides serial data output
function.
Expensive and bulky mechanical range
switches are not required. The other
functions are provided for MAX and MIN
holding and current value display, data
holding, Relative data and reference value
display, low battery detection, auto-power­off, diode measurement, continuity
checking.

Absolute Maximum Ratings

Characteristics Ratings
Supply Voltage (V- to AGND) -4V
Analog Input Voltage V+ to V­Digital Input V- to DGND
Power Dissipation Flat Package 500mW
Operating Temperature

Storage Temperature

0℃ to 70℃

-25℃ to 125℃

1 91年11月28日

ES51988

3 3/4 AUTO REL/MAX/MIN

Electrical Characteristics

TA=25℃,V- = -3V

Symbol Parameter Test Condition Min. Typ. Max. Count
V- Power Supply -3.5 -3.0 -2.2 Volt
Idd
Iss
REV

REB

NLV

NLB

VREF

Operating Supply Current Normal Power On

Auto-power-off
Rollover Error
(Voltage)
Rollover Error
(Bargraph)
Nonlinearity
(Voltage)
Nonlinearity
(Bargraph)
Input Leakage - 1 10 pA
Low Battery Flag Voltage V- to AGND -2.5 -2.3 -2.1 V
Zero Input Reading

Reference Voltage and 400Ω
measurement
Peak to Peak Backplane Drive

Voltage
Counter Time Base Period fosc=4MHz - 1 - Sec
Open Circuit Voltage for Ω

Measurement(except 400Ω)
Pull High to 0V Resistance FC1,FC2,FC3,FC4

Pull High to 0V Resistance KEY, SET - 250 ­AC Frequency Response

(4V range)

10M input

Resistor

Best Case

Straight Line

10MΩInput Resistor

100KΩ Between

VRH and AGND

-3.2≦V-≦-2.2

Ω and Continuity

Function

FC5,RANGE,HOLD,

MAX/MIN,REL

± 0.5﹪Error

± 2.5﹪Error

-

1.0

-

0.1

-

-

-

-

-000 000 +000 Count

-1.3 -1.2 -1.1 V

2.85 3.0 3.15 V

-0.5 -0.45 -0.4 V

- 2.5 -

--40 to
500

40 to
2000

-

-

-

-

1.55mA

± 0.1

± 0.5

± 0.1

± 0.5

﹪F.S.

﹪F.S.

﹪F.S.

﹪F.S.

-

-

uA

MΩ

KΩ

HZ

TCRF Reference Voltage

Temperature Coefficient

2 91年11月28日

100KΩBetween VRH
and AGND

0℃＜TA＜70℃

-50-

ppm/℃

ES51988

3 3/4 AUTO REL/MAX/MIN

Pin Description

Pin No. Symbol Description
1 V+ Positive supply voltage,output of on-chip DC-DC converter.
2 V+ Positive supply voltage,output of on-chip DC-DC converter.
3 CH+ High speed positive connection for reference capacitor.
4 CH- High speed negative connection for reference capacitor.
5 CIH High speed integrator output. Connected to integration capacitor.
6 BUFH Integration resistor connection for high speed buffer output.
7 CAZH High speed auto-zero capacitor connection
8 CL+ High resolution positive connection for reference capacitor.
9 CL- High resolution negative connection for reference capacitor.
10 CIL High resolution integrator output. Connected to integration capacitor.
11 CAZL High resolution auto-zero capacitor connection.
12 BUFL Integration resistor connection for high resolution buffer output.
13 IVSH High level current measurement input.
14 IVSL Low level current measurement input
15 OVX Input high voltage for resistance measurement.
16 OVH Output connection for resistance measurement.
17 OVSG Sense low voltage for resistance measurement.
18 OR1

19 VR5
20 VR4
21 VR3
22 VR2
23 TEST5 Test pin 5.

24 ACVL Negative output of AC to DC converter.
25 ACVH Positive output of AC to DC converter.
26 ADI Negative input of internal AC to DC OP AMP.
27 ADO Output of internal AC to DC OP AMP.
28 NC
29 NC
30 NC
31 SGND Signal ground.
32 VR1 Unknown voltage input .
33 NC
34 VR Reference input voltage connection. Typically -100 mV.
35 VRH Output of band-gap voltage reference. Typically -1.2 V.
36 ACVR Optional pin. When connected to -3V,ACV without 400mV range.
37 NC

Reference resistor connection for 399.9Ωrange.
Voltage measurement ÷ 10000 attenuator (3999V).
Voltage measurement ÷ 1000 attenuator (399.9V).
Voltage measurement ÷ 100 attenuator (39.99V).
Voltage measurement ÷ 10 attenuator (3.999V).

3 91年11月28日

ES51988

3 3/4 AUTO REL/MAX/MIN

Pin. No Symbol. Description
38 SLEEP When auto-power-off happen, this pin output will change from +3V

to –3V. When re-power on happens, this pin output will change back to

+3V.
39 TEST1 Test pin 1.
40 NC
41 FREQ Frequency counter input, offset to 1/2(V-).
42 SET Input to set serial data output. Pulse low to make this function active.
43 F100 100 HZ square wave output.
44 SEG24 LCD Segment line 24.
45 SEG23 LCD Segment line 23.
46 SEG22 LCD Segment line 22.
47 SEG21 LCD Segment line 21
48 SEG20 LCD Segment line 20.
49 SEG19 LCD Segment line 19.
50 SEG18 LCD Segment line 18.
51 SEG17 LCD Segment line 17.
52 SEG16 LCD Segment line 16.
53 SEG15 LCD Segment line 15.
54 SEG14 LCD Segment line 14.
55 SEG13 LCD Segment line 13.
56 SEG12 LCD Segment line 12.
57 SEG11 LCD Segment line 11.
58 SEG10 LCD Segment line 10.
59 SEG9 LCD Segment line 9.
60 SEG8 LCD Segment line 8.
61 SEG7 LCD Segment line 7.
62 SEG6 LCD Segment line 6.
63 SEG5 LCD Segment line 5.
64 SEG4 LCD Segment line 4.
65 SEG3 LCD Segment line 3.
66 SEG2 LCD Segment line 2.
67 SEG1 LCD Segment line 1.
68 ANNUNC Square-wave output at the backplane frequency, synchronized to BP1.

ANNUNC can be used to control display annunciator. Connecting an

LCD segment to ANNUNC and turns it on; connecting an LCD

segment to its backplane and turns it off.
69 BP4 LCD Backplane 4.
70 BP3 LCD Backplane 3.
71 BP2 LCD Backplane 2.
72 BP1 LCD Backplane 1.

4 91年11月28日

ES51988

3 3/4 AUTO REL/MAX/MIN

Pin. No Symbol. Description.
73 NC
74 BUZOUT Buzzer output. Audio frequency (2.0KHz) output which drives a

piezoelectric buzzer.
75 NC
76 NC
77 NC
78 NC
79 OSC1 Crystal oscillator (input) connection.
80 OSC2 Crystal oscillator (output) connection.
81 NC
82 KEY Mode change pin.
83 REL Input to get relative display. Pulse low to make this function active.
84 MAX/MIN Input to set MAX/MIN display. Pulse low to make this function active.
85 HOLD Input to hold display. Pulse low to make this function active.
86 RANGE Input to set automatic/manual mode and manual range selection. Pulse

low to make this function active.
87 FC5 Switch 5 for function selection.
88 FC4 Switch 4 for function selection.
89 FC3 Switch 3 for function selection.
90 FC2 Switch 2 for function selection.
91 FC1 Switch 1 for function selection.
92 LBAT9 Low battery voltage setting. If used 3V battery, connected this pin to

AGND, the default low battery voltage will be –2.3V. If used 9V

battery, when the input voltage is small than VRH(-1.2V), the low

battery annunciator will be display.
93 SDO Serial data output.
94 C+ Positive capacitor connection for on-chip DC-DC converter.
95 C- Negative capacitor connection for on-chip DC-DC converter.
96 V- Negative supply voltage.Connecting to battery negative terminal.
97 V- Negative supply voltage.Connecting to battery negative terminal.
98 DGND Digital ground,connected to battery positive terminal.
99 AGND Analog ground.
100 AGND Analog ground.

5 91年11月28日

Pin Configuration

A

D

A

G

G

G

N

N

N

D

D

D

ES51988

3 3/4 AUTO REL/MAX/MIN

M

L
B
A

S

F

F

T

D

C

V

V

-

C

C

-

O

+

-

C

9

1

2

F

F

F

C

C

C

3

4

5

A

R

X

A

H

/

N

O

G

L

E

D

K

M

R

E

I

E

N

Y

N

L

C

CH+

CH­CIH

BUFH

CAZH

CL+
CL-

CIL

CZAL

BUFL

IVSH

IVSL
OVX
OVH

OVSG

OR1
VR5
VR4
VR3

VR2

TEST5

ACVL

ACVH

ADI

ADO

NC

V+
V+

NC

NC

5

10

15

20

25

30

100

35

95

90

40 45

85

50

55

75

60

80

65

70

OSC2
OSC1
NC
NC

NC
NC
BUZOUT

NC

BP1
BP2
BP3

BP4

ANNUNC

SEG1
SEG2
SEG3

SEG4
SEG5
SEG6
SEG7
SEG8

SEG9
SEG10
SEG11
SEG12
SEG13
SEG14
SEG15

SEG16
SEG17

S

N

V

G

C

R

N

1

D

VRV

A
C

R

V

H

R

S

N
C

L
E
E
P

F

T

N

R

E

C

E

S

Q

T
1

S

S

F

E

1

E

G

0

T

2

0

4

S

S

S

E

E

E

G

G

G

2

2

2

1

2

3

S

S

S

E

E

E

G

G

G

1

1

2

8

9

0

6 91年11月28日

ES51988

3 3/4 AUTO REL/MAX/MIN

Operation Mode

(1) Measurement Description

Voltage Measurement

Resistive divider is automatically changed to provide in range reading
for 399.9mV to 3999V full scale reading. The following table shows
the various full scale range.

Range Full scale Resistive Ratio
VR1
VR2
VR3
VR4
VR5

399.9 mV

3.999 V

39.99 V

399.9 V
3999 V

1 , 1/1
R2/(R1+R2) , 1/10
R3/(R1+R3) , 1/100
R4/(R1+R4) , 1/1000
R5/(R1+R5) , 1/10000

Resistance Measurement

Resistive divider is automatically changed to provide the proper range.
The following table shows the various full scale range.

Range Full Scale Reference Resistor
OR1 399.9 Ω
OR2 3.999 KΩ
OR3 39.99 KΩ
OR4 399.9 KΩ
OR5 3.999 MΩ
OR6 39.99 MΩ

Current Measurement

In the current measurement mode , there are three range selections :

Mode Range Selection Full Scale
Automatic Mode 1 uA 399.9 uA

Automatic Mode 2 mA 39.99 mA

Manual Mode A 39.99 A
When the mode changes among (uA, mA, A), the original AC/DC
state will keep.

R6(100Ω)
R5(1KΩ)
R4(10KΩ)
R1||R3(=100KΩ)
R1||R2(=1MΩ)
R1(10MΩ)

3999 uA

399.9 mA

7 91年11月28日

ES51988

3 3/4 AUTO REL/MAX/MIN

Continuity Check

The continuity check is the same as the 399.9Ω range of the resistance
measurement mode (manual mode). If the bargraph number <=3 ,there will

2.0 KHz signal comes out from BUZOUT pin, if the bargraph number >=4,
there will be no beep exist.

Diode Measurement

Use the DCV 3.999V range of voltage measurement mode (manual mode ).
If the test circuit is open or the device (diode) under test is larger than 2V,
the LCD display will show "OL", but the bargraph will show the real
detected voltage.

Frequency Counter

The timebase of ES51988 is derived by a clock oscillator.
The timebase of counter is :

T

counter

4,000,000

=

F

osc

Thus , the counter will operate with a 1 second timebase when a
4MHz oscillator is used. For accurate frequency measurement,a
crystal oscillator is recommended. The frequency counter can
automatically or manually select the proper range. Autorange
operation extends over five decades from 1 Hz to 39.99MHz.

Range Full Scale
FR1
FR2
FR3
FR4
FR5

3.999 KHZ

39.99 KHZ

399.9 KHZ

3.999 MHZ

39.99 MHZ

8 91年11月28日

10A

10A

AGND

uA

mA

450

45

4.5

0.495

0.005

R

uA

uA

mA

mA

10A

1.5K

PTC

100K

100K

100K

100

IVSL

IVSH

AGND

OVX

OVH

OVSG

ES51988

3 3/4 AUTO REL/MAX/MIN

14

13

100

15

16

17

V.A.R

D1 D2

2.2u

15K

10K

5K

15K

2.2u

Z1
6V

Z2

0.22u

0.1u

R6

100

R5
R4

10K

R3

101K

R2

1.11M
10M

R1

66M

Analog Switch Selection

1K

OR1

VR5
VR4
VR3
VR2
VR1

SGND

ADO

ADI

ACVH

ACVL

TEST5

Note : Light shielding for Z1, Z2, D1, D2.

18
19
20
21
22
32
31

27

26

25

24
23

ES51988

INH

INL

OVSG

9 91年11月28日

3 3/4 AUTO REL/MAX/MIN

(2) Switch Description

Rotary mode : FC1,FC2,FC3,FC4,FC5

Measurement mode are depend on the logic levels of FC1,
FC2, FC3,FC4 FC5 and KEY :

When FC5=1

FC1 FC2 FC3 FC4 Mode Push mode(KEY)

1100DC V DC V — AC V
1110DC uA DC uA — AC uA
1101DC mA DC mA — AC mA
1111DC A DC A — AC A
0111

0110Continuity Continuity — Diode
1011

1010Frequency

When FC5=0, KEY is disabled.

ΩΩ— Continuity

ΩΩ— Continuity — Diode

ES51988

FC1 FC2 FC3 FC4 Mode

1100ACV
1110AC uA
1101AC mA
1111ACA
0111

0110Continuity
1011Diode
1010Frequency

Ω

10 91年11月28日

3 3/4 AUTO REL/MAX/MIN

Push mode

RANGE

The mode selection of Auto-mode and Manual-mode is determined
by RANGE pin. The following is the operating flow chart of Auto-mode
and Manual-mode.

1 push < 1 sec
Automatic
Mode

Manual
Mode

ES51988

1 push > 1 sec

* If HOLD, MAX/MIN, REL function is enabled，when RANGE
function is pressed，the enabled function will be clear.
* The bargraph is not affected by HOLD, MAX/MIN, REL function.

Function Auto Manual Control Range Initial Range

Voltage

(AC/DC)

uA(AC/DC)

mA(AC/DC)

A(AC/DC) Fix Fix 39.99A 39.99A

Ω R1－R6 Ri → Ri+1

Continuity Fix Fix

Diode Fix Fix 3.999V "OL"

Frequency

R1－R5 Ri → Ri+1

(R5→R1)

R1－R2 R1 → R2

R2 → R1

R1－R2 R1 → R2

R2 → R1

(R6→R1)

FR1－FR5 FRi→FRi+1

(FR5→FR1)

1 push < 1 sec

399.9mV

｜

3999V

399.9uA

｜

3999uA

39.99mA

｜

399.9mA

399.9Ω

｜

39.99MΩ

399.9Ω

3.999KHZ

｜

39.99MHZ

Range up

399.9mV(DC)

3.999V (AC)

3.999KHZ

399.9uA

39.99mA

"OL"

399.9Ω

"OL"

399.9Ω

3.999V

11 91年11月28日

ES51988

3 3/4 AUTO REL/MAX/MIN

HOLD :

1 push

RESET
(Automatic)

(1) Under auto mode, press the HOLD function, the mode will change to
manual mode and stay at the same scale range.
(2) If HOLD function is enabled, MAX/MIN, REL function is disabled. But if
MAX/MIN, REL function is pressed first, the HOLD function still can active.

(3) If continue to press the HOLD pin(logic low)then power on the
ES51988 , all the segments will blight until release the HOLD pin.

MAX/MIN :

1 push < 1 sec

RESET
(AUTOMATIC)

Data
Hold

1 push > 1 sec

"MAX" active
max value

1 push > 1 sec

"Min" active
min value

1 push <1 sec

1 push > 1 sec

"MAX MIN" blink
current value

(1) If MAX/MIN function is enaled, REL function is disabled, or if
REL function is enabled，MAX/MIN function is disabled.

(2) The sequent order is MAX value, MIN value, Current value.

REL :

RESET
(AUTOMATIC)

1 push >1 sec1 push <1 sec

"REL" active
the relative value

1 push<1 sec

"REL" blink
the Di(N) value

1 push >1 sec

* When REL function is enabled :

Display = Di(N+K) - Di(N) , K = 0,1,2,3, ...
Di(N) : Input reading when REL function active.
Di(N+K) : Next K step input reading.
* If the input value Di(N) or Di(N+K) ≧ (± 4000), the relative value will

display “OL”.

12 91年11月28日

ES51988

3 3/4 AUTO REL/MAX/MIN

Auto-Power-off function:

Once power on the ES51988, the auto-power-off function will be enabled
and if the functions are not changed in 30 minutes, the auto-power-off condition

will be happened and SLEEP pin output will change from +3V to –3V. When power-off
happens, the final data is saved. If continue to press anyone of the pushed function
(except HOLD pin)then power on the ES51988, the auto-power -off function will be
disabled , and LCD segment "APO" will be turned off.

(3) Buzzer

The BUZZER turns on in the following condition :

•1 beep : Measurement function changed ,power and re-power on ,
RANGE, HOLD, MAX/MIN, REL, SET or KEY are pushed.

• 3.3 beeps : Input reading overrange. (except diode,ohm,continuity,
frequency function used)

• 2.0 KHZ continue: Continue check (Bargraph number<=3).

• 2.0 KHZ continue 1.5 sec : Auto-power-off.

BUZZER output waveform :

2.0 KHz ( continued )

beeps (3.33 beeps/sec)

0.5 mS

0.15 sec

0.3 sec

13 91年11月28日

ES51988

3 3/4 AUTO REL/MAX/MIN

(4) Serial Data Output

The serial data is output two times from SDO pin on each A/D conversion cycle.The data
format satisfy JIS 7BIT transmission code and the baud rate is 2400,it means the receiver
terminal can use RS-232 interface to read data .

single package

0V

-3V

0

D0 ~D6

p

1P

LSB MSB

A single package include a start bit(0),D0~D6(7 bit), a parity check bit(odd) and a
stop bit(1).All the data stream is consist of 110× 2 bits. The high and low voltage levels

correspond to DGND and V- respectively. SDO remains at 1 (high) when it is inacetive.
Hence the start bit(0) could be used as the triggering signal to begin the reading process.

all package

0

range

0

0

p

1

0

p

1 0

digit0digit1

p

1 0

p

1 0

digit2digit3

p

1 0

function

p

1 0

p

1

p

1

p

1

status

0

CR LF

Digit0 ~ 3 data is exactly the receiver display number,but the status, function,range,
option1,option2 data all need written program to judge what the data mean.
Note : LSB bit is sent first,then MSB bit.
The meter always outputs the current input value to the serial port in spite of HOLD
mode. Each block is repeated twice in one conversion cycle. The detailed data format of each
packet is listed below.

14 91年11月28日

p

1 0

option1

p

1

option2

3 3/4 AUTO REL/MAX/MIN

RANGE :

Range V mA UA Ohm Frequency

0110000 400mV 40mA 400uA 400 Ohm 4K HZ
0110001 4V 400mA 4000uA 4K Ohm 40K HZ
0110010 40V 40K Ohm 400K HZ
0110011 400V 400K Ohm 4M HZ
0110100 4000V 4M Ohm 40M HZ
0110101 40M Ohm

Because Continuity,Diode, and Current(A) measurement range
are all fixed,so they are all the first code 0110000.

DIGIT0 ~ 3 :

Digit Display data
0110000 0
0110001 1
0110010 2
0110011 3
0110100 4
0110101 5
0110110 6
0110111 7
0111000 8
0111001 9

ES51988

If the input value is over-range(OL),the reading data DIGIT3=4,DIGIT2=0,
DIGIT1=0,DIGIT0=0,but under the frequency mode,DIGIT0~3 output the
measured value.

FUNCTION : The definition code is not the same as FC1 ~ FC4.

Function Measurement mode
0111111 A
0111110 uA
0111101 mA
0111100 Voltage
0110111

0110110 Continuity
0111011 Diode
0111010 Frequency

Ω

15 91年11月28日

3 3/4 AUTO REL/MAX/MIN

STATUS :

011-BATT0OL

BIT7 BIT6 BIT5 BIT4 BIT3 BIT2 BIT1

－ : "1" is for the negative(-).
BATT : "1" is for the battery voltage is less than 2.3V± 0.2V.
OL : "1" is for the input voltage over-range.

OPTION1 :

0110000

BIT7 BIT6 BIT5 BIT4 BIT3 BIT2 BIT1

OPTION2 :

ES51988

0 1 1 DC/AC AUTO MAN APO

BIT7 BIT6 BIT5 BIT4 BIT3 BIT2 BIT1

DC/AC : "1" is for the DC mode and Ω, Diode, Continuity, ADP, Frequency
Function, "0" is for the AC mode.

AUTO : "1" is for auto range.
MAN : "1" is for the manual range.
APO : "1" is for the auto-power-off function enabled.

CR(BACK) : Transmission code "0001101".
LF(LINE FEED) : Transmission code "0001010".

16 91年11月28日

TEST CIRCUIT

ES51988

3 3/4 AUTO REL/MAX/MIN

1 Voltage

D2

D1

15K

10K

5K

2 Resistor

15K

4 Current

AGND

100

1K
10K

101K

1.11M

0.47u

1.0u1.0u

88M

0.1u

OVSG

OR1
VR5
VR4
VR3

VR2

ADO

ADI
ACVH
ACVL
TEST5

Voltage

AGND
SGND

mA

0.005

0.495

4.5

uA

45

450

10A

V

V

R

R

1

10M

-100mV

10A

mA

mA

uA

uA

100K

100K

IVSH

IVSL

5 Frequency

F

V-

200

2.2u

PTC

R
E
Q

1.5K

Fin

PTC

1.5K

Z1
6V

Z2

100

1K
10K

101K

1.11M

100

OVX

OVH
OVSG

OR1
VR5
VR4
VR3

VR2

SGND

AGND

3 Diode

Z2

Z1
6V

PTC

1.5K

100

10M

1.11M

AGND

OVH

VR1

VR2

OVSG

6 Low battery

9V

BA
TT
ER
Y

0V

680K

0.1u

270K

17 91年11月28日

ES51988

LBAT9

AGND
V-

APPLICATION CIRCUIT

7.5V ZI

5.6V ZI

ES51988

3 3/4 AUTO REL/MAX/MIN

10A

mA

AGND

0.005

0.495

4.5

uA

D1

22K

45

10K

450

R

D2

5K

1.5K

PTC

Z1
6V

22K

10A

mA

mA

uA

uA

1.0u1.0u

0.47u

0.022u

200K

0.047u

100

1K
10K

101K

1.11M

0.1u

0.01u

0.1u

0.22u

0.47u
200K

100K

100K

100K

100

88M

+

10u

0.1u

0.1u

V+
V+

CH+
CH­CIH

BUFH

CAZH

CL+
CL-

CIL

CZAL

BUFL

IV S H

IV S L

OVX

OVH

OVSG

OR1
VR5
VR4
VR3
VR2

ADO

ADI

ACVH

ACVL

TEST5

A
G
N
D

10u

0.1u

A
G
N
D

3V

+

D
G
N
D

0.1u

S

F

V

C

C

V

-

D

-

-

+

O

F

L

C

C

B

1

2

A
T
9

F

F

F

C

C

C

5

3

4

M

R

H

A

A

O

X

N

L

/

G

D

M

E

I
N

R

K

E

E

L

Y

BUZOUT

-3 V

4 M HZ

OSC2

OSC1

-3 V

5.6V ZI

BP1

BP2

L
C
D

D
I
S
P
L
A
Y

S

-3 V

S

E

E

S

G

G

E

2

2

T

3

4

V
R

1u

C 1815
NPN

V
R
H

91k

S

F

L

R

E

E

E

Q

P

200

2.2u

PTC

4.7n

1.5K

S

V

G

R

N

1

D

10M

10k

+

Fin

-3 V

18 91年11月28日

3 3/4 AUTO REL/MAX/MIN

The Other

(1) LCD pin assignment

SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7
BP1 RS232 bar2 bar4 bar6 bar8 bar9 bar11
BP2 bar0 bar1 bar3 bar5 bar7 d3 bar10
BP3 bar-

BP4 DC BATT f3 AC AP0 a3 b3

SEG8 SEG9 SEG10 SEG11 SEG12 SEG13 SEG14
BP1 bar13 bar15 bar16 bar18 bar20 bar22 bar24
BP2 bar12 bar14 d2 bar17 bar19 bar21 bar23
BP3p3e2g2c2pxp2e1
BP4 REL f2 a2 b2 HOLD MAX f1

－

AUTO MANU e3 g3 c3

ES51988

SEG15 SEG16 SEG17 SEG18 SEG19 SEG20 SEG21
BP1 bar25 bar27 bar29 bar31 bar32 bar34 bar36
BP2 d1 bar26 bar28 bar30 d0 bar33 bar35
BP3g1c1p1e0g0c0M
BP4 a1 b1 MIN f0 a0 b0 u

SEG22 SEG23 SEG24
BP1 bar38 bar40 HZ
BP2 bar37 bar39

BP3 K V A
BP4 m

NOTE : 1 : "bar0" is normally ON.
2 : "px" is always OFF(not used).

Ω

19 91年11月28日

3 3/4 AUTO REL/MAX/MIN

BATT APO REL HOLD MAX MIN

RS232

DC AC

AUTO

MANU

LCD Display Panel

ES51988

umVA

Ω

MK

HZ

Backplane Waveform (Frequency = 62.5 HZ)

ANNUNC

BP1

BP2

BP3

(V-)+3V

V-

(V-)+3V

V-

(V-)+3V

V-

(V-)+3V

V-

(V-)+3V

BP4

V-

20 91年11月28日

ES51988

3 3/4 AUTO REL/MAX/MIN

(2) LCD Display ON Condition

LCD Annunciator
"BATT" Low battery is detected.
"DC" DC voltage and DC current functions are

used.

"AC" AC voltage and AC current functions are

used.
"-" DC voltage and current function.
"AUTO" Automatic mode is used.
"MANU" Manual mode is used.
"REL" REL function is used.
"HOLD" HOLD function is used.
"MAX" MAX function is used.
"MIN" MIN function is used.

" "＆"Ω"
" "＆"V"
"mV" AC/DC voltage function is used.

"umA" AC/DC current function is used.
"MKΩ" Ω measurement function is used.

"MKHZ" Frequency counter is used.
"APO" Auto-power-off function is used.
"RS232" Serial data output is used.
Bargraph Bargraph annunciator is only depend on input

Continuity-check is used.

Diode measurement is used.

reading .

(3) .High Resolution and High Speed(Bargraph) time

High Resolution High Speed

Mode Current(I)

Measurement

ZI

AZ

INT 100m sec 100m sec 10m sec 10m sec

DEINT 200m sec 400m sec 20m sec 40m sec

21 91年11月28日

100m sec
150m sec

Other Measurement

(V,R)
100m sec
150m sec

Current(I)

Measurement

10m sec
15m sec

Other Measurement

(V,R)
10m sec
15m sec

Package

1 100 Pin QFP Package

W

L

ES51988

3 3/4 AUTO REL/MAX/MIN

A

BC

2 Dimension Paramenters

Symbol

W 19.90 20.00 20.10 783.5 787.4 791.3

L 13.90 14.00 14.10 547.2 551.2 551.2

A 0.425 16.7

B 0.20 0.30 0.40 7.9 11.8 11.8
C 0.65 25.6

d 1.05 1.20 1.35 41.3 47.2 47.2
a 2.57 2.72 2.87 101.2 107.1 107.1

D 2.50 98.4

θ

b

θ

D

d

Milimeter Mill

Min. Typ. Max. Min. Typ. Max.

o

0

10

o

a

22 91年11月28日