CYRUSTEK CO.
¥
Features
Analog to digital converter.
Frequency counter.
Frequency counter, auto range from 2KHz to
20MHz
Low battery detector.
Description
The ES5108 is design for 3 1/2-Digit Digital Multi-
meter which combines an integrated A/D converter,
MAX/MIN, hold, short circuit beeper, low battery de-
tector, a frequency counter, and serial data output.
A ’HOLD’ input allows the ES5108 to hold the cur-
rent A/D readout or frequency readout. The frequency
counter is auto-ranging from 2KHz to 20MHz over a
five decade range with KHz and MHz annunciators.
Short circuit beeper will sound whenever the readout
is less than 30 after enabling the short circuit beeper.
This feature is useful in detecting short circuits without
watching the LCD.
The ES5108 provides 3 independent decimal point driv-
ing pins for the manufacturer to determine which deci-
mal point or unit is display, the 3 decimal point drivers
are built-in ES5108.
Display hold and Max/Min.
Triplex LCD display.
Full 3 1/2-Digit Display.
Annunciators—Hold, Max/Min,
MHz, Low-bat, Continuance.
KHz,
1 annunciator drive pin for unit display.
3 decimal point drivers with 3 independent
control pins.
Polarity driver.
Displays "OL" for input over range.
Provides serial data output.
Guaranteed zero reading with zero input.
True polarity indication for precision null detec-
tion.
Application
Digital panel meters, digital multimeters, thermome-
ters, capacitance meters, pH meters, photometers, etc.
Convenient 9V battery operation.
Low noise A/D converter:
1
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Short circuit beeper.
Low linearity error.
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Multi-function measurement system :
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ES5108
3 1/2 Digit
ADC with serial output
Differential inputs, 1pA bias current.
Differential reference for ratiometric ohms.
On-chip voltage reference,
drift.
C
July 4, 2002
CYRUSTEK CO.
Pin Description
Pin No.
1
2
3
4
5
6
7
8
Symbol
VREF-
VREF+
DGND
OSC3
OSC2
OSC1
INT
FREQ/VOLT
Type
-
-
-
-
-
-
O
I
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
V+
CONT/-/MHz
B4/C4/DP3
KHz/F3/E3
A3/G3/D3
B3/C3/DP2
HOLD/F2/E2
A2/G2/D2
B2/C2/DP1
MAX/F1/E1
A1/G1/D1
B1/C1/BAT
COM1
COM2
COM3
FREQ-in
DINT
ANNUNC
P
O
O
O
O
O
O
O
O
O
O
O
O
O
O
I
O
O
27
28
29
30
DP1
DP2
DP3
RESET
I
I
I
I
I
I
O
O
I
I
O
This table is for ES5108F
Y Y
Y
31
MAX
32
HOLD
33
LB
34
BZOUT
35
BZINS
36
CLK
37
SDO
continued on next page
£
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¢
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X
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ES5108
3 1/2 Digit
ADC with serial output
Description
Low differential reference input connection.
High differential reference input connection.
Pull high to V+ all LCD segments will be activated.
Crystal oscillator connection.(RC)
Crystal oscillator connection.(input)
Crystal oscillator connection.(output)
Integration status flag.
Frequency counter/voltage measurement select pin. Connecting to V+
will enable the frequency counter, connecting to TEST1 or open will ex-
ecute voltage measurement. This pin is internally pull down to TEST1.
Positive supply voltage.
LCD segment drive. (Continuity., polarity, MHz)
LCD segment drive. (B4, C4, decimal point3)
LCD segment drive. (KHz, F3, E3)
LCD segment drive. (A3, G3, D3)
LCD segment drive. (B3, C3, decimal point2)
LCD segment drive. (Data Hold, F2, E2)
LCD segment drive. (A2, G2, D2)
LCD segment drive. (B2, C2, decimal point 1)
LCD segment drive. (Max, F1, E1)
LCD segment drive. (A1, G1, D1)
LCD segment drive. (B1, C1, low battery)
LCD common drive#1.
LCD common drive#2.
LCD common drive#3.
Frequency counter input pin.
De-Integration status flag.
Square wave output at the LCD backplane frequency, synchronized to
COM1. Connecting an LCD segment to ANNUNC pin turns it on; con-
necting to backplane turns it off.
1st decimal point selection input for voltage measurement, internally
pulled-down to TEST1.
2nd decimal point selection input for voltage measurement, internally
pulled-down to TEST1.
3rd decimal point selection input for voltage measurement, internally
pulled-down to TEST1.
Reset input pin. Connecting to V+ will cancel both MAX/MIN and
Hold functions.
MAX input pin. Pulse to V+ to enable MAX function.
Hold input pin. Connecting to V+ for hold function.
Low battery flag. Pull high if low battery.
Piezo buzzer output. Driving a buzzer at 2.5KHz audio frequency.
Buzzer control slave input.
External clock input pin for serial data accessing.
Serial data output pin.
July 4, 2002
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