1
* This specification are subject to be changed without notice.
EM32100
8/10 DIGIT LCD DRIVER
2.10.1999
GENERAL DESCRIPTION
The EM32100 is a CMOS LCD display driver which can receive dialing data from dialer IC and display on
the LCD panel. The EM32100 can also display real time clock, conversation time (stopwatch).
FEATURES
Drive 8/10 digits LCD panel.
Display dialing number.
Display real time clock (RTC) in 12 hour or 24 hour format selectable.
Stopwatch function for counting conversation time up to 59 minutes 59 seconds.
Operating voltage: 1.5 VDC ( typical )
Operating current : 3 A (max.)
LCD driver method : 1/3 duty , 1/2 bias.
Internal voltage doubler circuit for drive LCD.
Internal dialer interface.
Use single colck 32768Hz crystal.
Package in QFP 48 pins or chip form .
APPLICATION FIELD
Telephone and Digital display system.
EM32100
8/10 DIGIT LCD DRIVER
PIN ASSIGNMENTS
NC
VP
VN
V
EE
SEG24
SEG23
SEG22
SEG21
SEG20
SEG19
SEG18
SEG17
13
14
15
16
17
18
19
20
21
22
23
24
12
11
10
9
8
7
6
5
4
3
2
1
SEG16
SEG15
SEG14
SEG13
SEG12
SEG11
SEG10
NC
SEG9
SEG8
SEG7
SEG6
EM32100
48
47
46
45
44
43
42
41
40
39
38
37
25
26
27
28
29
30
31
32
33
34
35
36
NC
F32H
TESTI
TEST2
COM3
COM2
COM1
SEG1
SEG2
SEG3
SEG4
SEG5
NC
ENRTC
24/12
VSS
XOUT
NC
XIN
V
DD
HKS
SDI
MS2
MS1
* This specification are subject to be changed without notice.
EM32100
8/10 DIGIT LCD DRIVER
2
2.10.1999
FUNCTION BLOCK DIAGRAM
Serial
Data
Samplin
&
Decoding
RTC/STW
Counter
COM1~3
OSC.
SEG1~24
1/3 Duty 1/2 Bias LCD Driver
Timing
&
Control
Circuit
Sampling
Signal
Generator
Power
Supply
Circuit
SDI
XIN
XOUT
VDD
VSS
VP
VEE
VN
F32HZ
HKS*
24/12
*
ENRTC*
MS1
MS2
TESTI*
Serial
Data
Display Buffer
PIN DESCRIPTIONS
Symbol
Function
MS1
RTC (Real Time Clock ) manual setting pin 1 (internal pull up resistor typ. 150k
,debounce
time=15.6ms)
MS2
RTC ( Real Time Clock ) manual setting pin 2 ; internal pull up resistor : idle ( On-Hook ) =
5M
, normal ( Off- Hook ) = 150k
; at idle and normal state , debounce time=15.6ms ,
at test mode state , no debounce time )
SDI
Serial data input pin ( internal pull up resistor = 5 M
)
HKS
Hook switch status input pin. ( This pin "High",On-Hook ; "Low",Off-Hook )
V
DD
Power supply pin
XIN,XOUT
Crystal input and output pins(crystal=32768Hz)
V
SS
Power supply pin
24/12
RTC display 24 or 12 hours format select pin.(This pin "high",24 hours form;"low",12
hours form,input pin)
ENRTC
RTC enable or disable detect pin. ( This pin detect "high", RTC disable; "low" , RTC
enable , input pin )
VEE,VP,VN
Voltage doubler circuit for LCD driver ( DC-DC frequency conversion=1024Hz )
SEG1~SEG24
LCD panel driver segment output pins
COM1~COM3
LCD panel driver common output pins ( Frame Frequency= 34.13 Hz).
TEST2
No connection , reserve for testing
TESTI
Enter test mode detect pin
F32H
Signal 32 Hz output for testing ,NMOS open drain structure
* This specification are subject to be changed without notice.
EM32100
8/10 DIGIT LCD DRIVER
4
2.10.1999
<Note>:
If SEG20~23 are not used, then it can be used as an 8 digits LCD display driver.
Serial Data Interface
When the EM32100 senses the falling edge of the Start bit, it will sample subsequent bits in the middle of
each bit. The received bit will then be assembled and decoded, and corresponding pattern will be displayed
on LCD panel. The serial data format is as follows:
The frequence of every bit is 256Hz ( about 3.9 ms)
There are two categories of dialing data, and representation of serial data is as the following:
0
1
Bit0
Bit1
Bit2
Bit3
Bit4
Bit5
0
1
Start bit
Stop bit
Data bits
5
* This specification are subject to be changed without notice.
EM32100
8/10 DIGIT LCD DRIVER
2.10.1999
(b5b4 = 00) Digit key
Key
1
2
3
4
5
6
7
8
9
0
*
#
P
P
T
b3b2b1b0
0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110
Display
1
2
3
4
5
6
7
8
9
0
P
(b5b4 = 10 ) function key
Key
F
b3b2b1b0
1111
Display
Note:
1. Flash key will be treated as "clear LCD panel" command.
2. Any invalid data will be ignored by the EM32100.
FUNCTION DESCRIPTION
Dialing dispaly
The serial data received by SDI pin of EM32100 will be decoded and shown on LCD panel. Display format
is as follows:
Off-Hook state mode:
F
F
T
F
F
T
F
T
F
T
F
F
T
T
T
F
F
F
T
T
T
T
F
F
T
T
T
T
F
Data Valid?
27
RTC Mode
24
6 Sec. Expire?
21
Data V alid?
20
Data In?
19
6 Sec. E xpire?
18
HKS = 1?
17
Start T imer
16
Display Dialing
No.
15
Data V alid?
14
H K S = 0
13
Start Tim er
12
MS1 = 0?
11
Data in?
10
HKS = 1?
9
Display RTC
8
MS1 = 0
7
MS2 = 0?
6
Data In?
5
HKS = 1?
4
STW Display
3
Reset STW
2
Start
1
T
F
MS2 = 0 ?
F
T
M S 1= 0 ?
M S 2 = 0 ?
T
F
F
T
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