Datasheet GSM798E Datasheet (Syntek)

LCD Controller / Driver 1 / 10 Issue Date :

Syntek Semiconductor Co., Ltd.

GSM798E

Introduction:

GSM798E is a segment/common driver for dot matrix type LCD display. It
features 40 channels with 20 X 2 bits bi-directional shift registers, data latches,
LCD drivers and logic control circuits. It is fabricated by high voltage CMOS
process with low current consumption.

The GSM798E can convert serial data received from a LCD controller, such as
GSM7980, into parallel data and send out LCD driving waveforms to the LCD
panel. The GSM798E is designed for general-purpose LCD drivers. It can drive
both static and dynamic drive LCD. The LSI can be used as segment/common
driver.

The GSM798E has pin function compatibility with the KS0065B that allows the
user easily to replace it with a GSM798E.

Functions:

l Dot matrix LCD driver with two 20 channel outputs
l Selectable function to use common/segment drivers simultaneously
l Bias voltage (V1 ~ V6)
l input/output signals

n Input : Serial display data and control pulse from controller IC
n Output : 20 X 2 channels waveform for LCD driving

Features:

l Display driving bias : static to 1/5
l Power supply for logic : 2.7V ~ 5.5V
l Power supply for LCD voltage (VDD~VEE) : 3V ~ 11V

64 Pin QFP package and bare chip available

LCD Controller / Driver 2 / 10 Issue Date :

Syntek Semiconductor Co., Ltd.

GSM798E

PAD Arrangement

48

(0,0)

Size: 2310x1830 um

2

Coordinate: center
Min. PAD Pitch: 120um

G798E

“G798E” Marking: Easy to find the PAD

47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31

49

50

51

52

53

54

55

56

57

58

59

1

2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

30

29

28

27

26

25

24

23

22

21

20

SEGMENT DRIVER SEGMENT DRIVER

DATA LATCH(20BITs) DATA LATCH(20BITs)

BIDIRECTIONAL
SHIFTER(20BITs)

BIDIRECTIONAL
SHIFTER(20BITs)

CONTOL

V1
V2
V3
V4

M
CL1
CL2

DL1 SHL1 DR1 DL2 SHL2 DR2

S1 ...................S20 S21................S40

VDD
VSS
VEE

GSM798E FUNCTIONAL BLOCK DIAGRAM

V5
V6

FCS

LCD Controller / Driver 3 / 10 Issue Date :

Syntek Semiconductor Co., Ltd.

GSM798E

PAD NAMES AND COORDINATES

Pad No. Pad Name X Y

1 VEE -1045 -670
2 CL1 -1040 -805
3 CL2 -910 -805
4 VSS -780 -805
5 DL1 -660 -805
6 DR1 -540 -805
7 DL2 -420 -805
8 DR2 -300 -805

9 M -180 -805
10 SHL1 -60 -805
11 SHL2 60 -805
12 FCS 180 -805
13 V1 300 -805
14 V2 420 -805
15 V3 540 -805
16 V4 660 -805
17 V5 780 -805
18 V6 910 -805
19 S[40] 1040 -800
20 S[39] 1045 -623
21 S[38] 1045 -488
22 S[37] 1045 -358
23 S[36] 1045 -233
24 S[35] 1045 -108
25 S[30] 1045 20
26 S[31] 1045 145
27 S[32] 1045 270
28 S[33] 1045 395
29 S[34] 1045 525
30 S[29] 1045 655

Pad No. Pad Name X Y

31 S[28] 1040 800
32 S[27] 910 805
33 S[26] 780 805
34 S[25] 660 805
35 S[24] 540 805
36 S[23] 420 805
37 S[22] 300 805
38 S[21] 180 805
39 S[20] 60 805
40 S[19] -60 805
41 S[18] -180 805
42 S[17] -300 805
43 S[16] -420 805
44 S[15] -540 805
45 S[14] -660 805
46 S[13] -780 805
47 S[12] -910 805
48 S[9] -1040 800
49 S[10] -1045 670
50 S[11] -1045 540
51 S[8] -1045 420
52 S[7] -1045 300
53 VDD -1045 180
54 S[6] -1045 60
55 S[5] -1045 -60
56 S[4] -1045 -180
57 S[3] -1045 -300
58 S[2] -1045 -420
59 S[1] -1045 -540

LCD Controller / Driver 4 / 10 Issue Date :

Syntek Semiconductor Co., Ltd.

GSM798E

Pin Description:

PIN NAME PURPOSE DESCRIPTION I/O

VDD POWER for logic N/A
VSS GROUND for logic N/A

VEE LCD GND for LCD driving voltage N/A
V1 V2 LCD output used as select voltage level I
V3 V4 LCD output Used as non select voltage level for Part I I
V5 V6 LCD output Used as non select voltage level for Part II I

S[1]-S[20] segment LCD driver output for part 1 O

SHL1 direction direction control for part 1 segments I

DL1, DR1 data in /out If SHL1 = 1 then DL1=out, DR1=in

If SHL1 = 0 then DL1=in, DR1=out

I/O

S[21]-S[40] segment LCD driver output for part 2 O

SHL2 direction direction control for part 2 segments I

DL2, DR2 data in/out If SHL2 = 1 then DL2=out, DR2=in

If SHL2 = 0 then DL2=in, DR2=out

I/O

M alternation Alternate the LCD driving waveform I
CL1 latch clock latch the data after shift is completed I
CL2 shift clock shift the data into the segments I

FCS mode selection mode select signal for Part II I

LCD Controller / Driver 5 / 10 Issue Date :

Syntek Semiconductor Co., Ltd.

GSM798E

Functional Description:

Shift Registers and Data I/O

The GSM798E supplies two sets of shift register, which controls the shift direction by SHL1
& SHL2. The DL1, DR1, DL2 and DR2 are data input or output option function.

Shift Direction of Channel 1/2

SHL1/SHL2 Shift Direction DL1/DL2 DR1/DR2

0 S[1] à S[20] (S[21] à S[40]) IN OUT
1 S[20] à S[1] (S[40] à S[21]) OUT IN

Clock and Mode Selection

In channel 1 part, the CL1 is the clock to latch data on the falling edge. It latches the data
input from the bi-directional shift register at the falling edge of CL1 and transfers its outputs
to the LCD driver circuit. The CL2 is the clock to shift data on the falling edge. It shifts the
serial data at the falling of CL2 and transfers the output of each bit of the register to the latch
circuit.
In channel 2 part, the CL1 and CL2 is the clock to latch or shift data on the falling or rising
edge which is depend on FCS value. When FCS is low, the channel 2 function is the same
as channel 1 as a segment driver. When FCS is high, the channel 2 function will become a
common driver. Detail functions are show in the following table:

FCS Channel 1 Channel 2

Latch data Latch DataCL1

---- ----

Shift data Shift data

0

CL2

---- ----

Latch data ----CL1

---- Shift data

Shift data ----

1

CL2

---- Latch data

LCD Controller / Driver 6 / 10 Issue Date :

Syntek Semiconductor Co., Ltd.

GSM798E

LCD Output Waveforms

The output levels of channel1 and channel2 are decided by the combination of FCS, M, and
latched data. Refer to the following table:

FCS Latched Data M Channel 1 Channel 2

1 V1 V21
0 V2 V1
1 V3 V6

1

0

0 V4 V5
1 V1 V11
0 V2 V2
1 V3 V5

0

0

0 V4 V6

Note:

To use the same function of channel 1 and channel 2 as a segment driver, V3 and V5, V4 and V6 need
to short respectively.

Output of LATCH

DATA

M

Channel1 Output

(S[1] ~ S[20])

V1 V1

V2

V3

V4

V2

V3

V4

FCS

V2

V1

V6

V5

V1

V2

V5

V6

Channel2 Output
(S[21] ~ S[40])

LCD Controller / Driver 7 / 10 Issue Date :

Syntek Semiconductor Co., Ltd.

GSM798E

Channel 1 used as a segment driver and channel 2 as a common driver (FCS=1)

When channel 2 is used as a common driver, FCS is connected to VDD. Channel 2 will
shift data on the rising edge of CL1 and latch data on the rising edge of CL2.

Both Channels 1 and 2 used as segment drivers (FCS=0)

When both channels 1 and 2 of the GSM798E are used as segment drivers, they will shift
data on the falling edge of CL2 and latch data on the falling edge of CL1. V3&V5, V4&V6
are shorted in the application circuit as shown in the following figure.

V6

LCD

Controll

D

CL1
CL2

M

FLM

DL1
CL1

CL2

M

DL2

V1
V2
V3
V4
V5

V1 V2 V3 V4 V5 V6

S[1] – S[20] S[21] – S[40]

GSM798E

FCS
SHL1
SHL2

VDD

VSS

To LCD Segment To LCD Common

GSM7980

LCD Controller

D

CL1
CL2

M

DL1
CL1

CL2

M

V1
V2
V3
V4

V1 V2 V3 V4 V5 V6

S[1] – S[40]

GSM798E

FCS
SHL1
SHL2

VSS

To LCD Segment

DR1
DL1
DR2

LCD Controller / Driver 8 / 10 Issue Date :

Syntek Semiconductor Co., Ltd.

GSM798E

Both Channels 1 and 2 used as common drivers (FCS=0)

When both channels 1 and 2 of the GSM798E are used as common drivers, the FCS is set
low and the signals (CL1, CL2, M) from the controller are connected as shown in the
following figure.

Timing Characteristics

CL2

Data in
(DL1, DL2)
(DR1, DR2)

Data out
(DL1, DL2)
(DR1, DR2)

CL1

M

V

IH

V

IL

T

R

T

WCKH

T

F

T

WCKL

T

DH

T

SU

T

D

V

OH

V

OL

T

SL

T

LS

T

LS

T

WCKH

T

R

T

SU

V6

LCD

Controll

FLM

CL1
CL2

M

DL1
CL1

CL2

M

V1
V2

V5

V1 V2 V3 V4 V5 V6

S[1] – S[40]

GSM798E

FCS
SHL1
SHL2

VSS

To LCD Common

DR1
DL2
DR2

LCD Controller / Driver 9 / 10 Issue Date :

Syntek Semiconductor Co., Ltd.

GSM798E

D.C Characteristics:

Symbol Parameter Test Condition Min. Typ. Max. Unit Applicable pin

V

DD

Operating Voltage - 2.7 - 5.5 V -

V

LCD

Driver Supply Voltage VDD-V

EE

3 - 11 V -

V

IH

Input High Voltage - 0.7V

DD

- V

DD

V

V

IL

Input Low Voltage - 0 - 0.3V

DD

V

I

LKG

Input Leakage Current VIN = 0 ~ V

DD

-5 - 5 uA

CL1,CL2,M,SHL1,SHL2

DL1,DL2,DR1,DR2

V

OH

Output High Voltage IOH = -0.4mA VDD-0.4 - - V

V

OL

Output Low Voltage IOL = +0.4mA - - 0.4 V

DL1,DL2,DR1,DR2

V1~V6, S[1]~S[40]

I

DD

Operating Current F

CL2

= 400K

HZ

- 100 300 uA VDD,V

EE

I

V

Leakage Current VIN = VDD ~ V

EE

-10 - 10 uA V1 ~ V6

A.C Characteristics:

Symbol Parameter Test Condition Min. Max. Unit Applicable pin

F

CL

Data Shift Frequency - - 400 K

HZ

CL2

T

WCKH

Clock High Level Width - 800 - ns CL1,CL2

T

WCKL

Clock Low Level Width - 800 - ns CL2

T

SL

Clock Set-up Time CL2 à CL1 500 - ns CL1,CL2

T

LS

Clock Set-up Time CL1 à CL2 500 - ns CL1,CL2

TR/T

F

Clock Rise/Fall Time - - 200 ns CL1,CL2

T

SU

Data Set-up Time - 300 - ns DL1,DL2,DR1,DR2

T

DH

Data Hold Time - 300 - ns DL1,DL2,DR1,DR2

T

D

Data Delay Time CL = 15 PF - 500 ns DL1,DL2,DR1,DR2

Maximum Absolute Ratings:

Symbol Parameters Min. Max. Unit

V

DD

Supply Voltage -0.3 7 V

T

OPR

Operating Temperature -20 75

0

C

T

STG

Storage Temperature -55 125

0

C

LCD Controller / Driver 10 / 10 Issue Date :

Syntek Semiconductor Co., Ltd.

GSM798E

Application Circuit: (2Line x 24Word)

Dot Matrix LCD

Panel

GSM7980

COM1-

16

SEG1-

40

D

Vdd

GND

CL2

CL1

M

V1

V2

V3

V4

V5

S1-S40

DL1

VDD

SHL1

SHL2

GND

GSM798E

VEE

V1V3V4

V2

DR2

DL2

DR1

CL1

CL2

M

S1-S40

DL1

VDD

SHL1

SHL2

GND

GSM798E

VEE

V1V3V4

V2

DR2

DL2

DR1

CL1

CL2

M

DB0-DB7

To MPU

Reg. Reg. Reg. Reg. Reg. Reg.

Vdd(+5V/+3V

)

-V or

GND

Note: R= 2.2K ~ 10K, VR= 1K~30K

FCS

FCS

V5V6V5

V6