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Part: ST7921
Category:
Optoelectronics
-> Drivers/Controllers
-> LCDs
-> LCD Driver
Description: Type = Character ;; Resolution (COM X SEG) = 96 Seg ;; Compatible = For ST7920 Extension ;; Package = Cob ;; Interface = /
Company: Sitronix
Datasheet: Download ST7921 datasheet File size : 736 kB
Request For quote: Find where to buy ST7921
Datasheet text preview:
ST
Sitronix
Features :
Display driving bias : static to 1/5 Power supply for logic : 2.7V ~ 5.5V Power supply for LCD voltage (V0~VSS) : 3V ~ 7V Dot matrix LCD driver with two 48 channel outputs Bias voltage (V0 ~ V4) Input/Output signals
Input : Serial display data and control pulse from controller IC Output : 48 X 2 channels waveform for LCD driving
ST7921
96CH Segment Driver For Dot Matrix LCD
General Description :
ST7921 is a segment driver for dot matrix type LCD display. It features 96 channels with 48 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 ST7921 can convert serial data received from an LCD controller, such as ST7920, into parallel data and send out LCD driving waveforms to the LCD panel. The ST7921 is designed for general purpose LCD drivers. It can drive both static and dynamic drive LCD. The LSI can be used as segment driver.
Ver 1.5
1/10
2003-09-26
ST7921
ST7921 Functional Block
S1.......S48
S49...........S.9.6 ...
V1 V2 V3 V4
SEGMENT DRIVER
SEGMENT DRIVER VDD VSS V0
DATA LATCH(48bits)
DATA LATCH(48bits)
BIDIRECTIONAL SHIFTER(48bits)
BIDIRECTIONAL SHIFTER(48bits)
M CL1 CL2
CONTOL
DL1 SHL1 DR1
DL2 SHL2 DR2
Ver 1.5
2/10
2003-09-26
ST7921
Pin Description :
Pin Name
VDD VSS
Purpose
POWER GROUND
Description
for logic for logic
I/O
N/A N/A
V0 V2 V3
LCD Power
for LCD driving voltage
I
S1-S48 SHL1
segment direction
LCD driver output for part 1 direction control for part 1 segments If SHL1 = 1 then DL1=out, DR1=in If SHL1 = 0 then DL1=in, DR1=out LCD driver output for part 2 direction control for part 2 segments If SHL2 = 1 then DL2=out, DR2=in If SHL2 = 0 then DL2=in, DR2=out Alternate the LCD driving waveform latch the data after shift is completed shift the data into the segments
O I
DL1, DR1
data in /out
I/O
S49-S96 SHL2
segment direction
O I
DL2, DR2
data in/out
I/O
M CL1 CL2
alternation latch clock shift clock
I I I
Ver 1.5
3/10
2003-09-26
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