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PDF uPD16431AGC-7ET Data sheet ( Hoja de datos )
| Número de pieza | uPD16431AGC-7ET | |
| Descripción | 1/2/ 1/3/ 1/4-DUTY LCD CONTROLLER/DRIVER | |
| Fabricantes | NEC | |
| Logotipo |  |
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DATA SHEET
MOS INTEGRATED CIRCUIT
µPD16431A
1/2, 1/3, 1/4-DUTY LCD CONTROLLER/DRIVER
The µPD16431A is an LCD controller/driver that enables display of segment type LCDs of 1/2, 1/3, or 1/4 duty
cycle. This controller/driver has 56 segment output lines of which eight can also be used as LED output lines.
Because the LCD driver contained in the µPD16431A has separate logic and power supply, up to 6.5 V of LCD
drive voltage can be set. In addition, key source output lines for key scanning and key input data lines are
also provided, so that the µPD16431A is ideal for applications in the front panel of an automobile stereo system.
FEATURES
• Various display modes
1/2 duty: 112 segment outputs or 96 segment outputs + 8 LED outputs
1/3 duty: 168 segment outputs or 144 segment outputs + 8 LED outputs
1/4 duty: 224 segment outputs or 192 segment outputs + 8 LED outputs
• Key scan circuit (key source outputs are shared with LCD driver outputs)
• Independent LCD driver power supply VLCD (can be set to VDD to 6.5 V)
• Serial data input/output (SCK, STB, DATA)
• On-chip oscillator incorporated
• Power-ON reset circuit
ORDERING INFORMATION
Part Number
µPD16431AGC-7ET
Package
80-pin plastic QFP (0.65 pitch, 14 × 14)
Document No. IC-3414
(O.D. No. IC-8885)
Date Published January 1995 P
Printed in Japan
© 1995
1 page  
µPD16431A
CONFIGURATION OF SHIFT REGISTER
Two shift registers, an 8-bit command register and a 56-bit display register, are provided. The first 8 bits
of input data are recognized as a command and are sent to the command register, and the 9th bit and those
that follow are recognized as display data and are sent to the display register.
8-bit shift register
MSB
LSB
MSB
56-bit shift register
b7 b0
Command
LSB
SEG56/LED8
Display data (LCD, LED)
SEG1
Transfer direction
The meaning of the display data is as follows:
LCD: 0 → off, 1 → on
LED: 0 → on, 1 → off
Be sure to transfer 56 bits of display data.
CONFIGURATION OF OUTPUT LATCH
MSB
SEG56/LED8
SEG56/LED8
SEG56/LED8
SEG56/LED8
LSB
SEG1 COM1 (latch addressNote: 00)
SEG1 COM2 (latch addressNote: 01)
SEG1 COM3 (latch addressNote: 10)
SEG1 COM4 (latch addressNote: 11)
Note Bits b3 and b4 of status command (Refer to page 8.)
5
5 Page 
µPD16431A
OUTPUT SELECT VOLTAGE
1. COM
When selected
When not selected
When key scanned
When selected
When not selected
When key scanned
+
VLCD
VLCD
1/2 VLCD
VLC2
1/2 VLCD
VLC2
VLCD
VLCD
1/3 VLCD
VLC3
1/2 VLCD
VLC2
–
GND
GND
1/2 VLCD
VLC2
1/2 VLCD
VLC2
GND
GND
2/3 VLCD
VLC1
1/2 VLCD
VLC2
Bias
1/2 bias
1/3 bias
Top : with internal power supply
Bottom: with external power supply
2. SEG
When selected
When not selected
When key scanned
When key not
scanned
When selected
When not selected
When key scanned
When key not
scanned
+
GND
GND
VLCD
VLCD
GND
GND
VLCD
VLCD
GND
GND
2/3 VLCD
VLC1
GND
GND
VLCD
VLCD
–
VLCD
VLCD
GND
GND
VLCD
VLCD
GND
GND
VLCD
VLCD
1/3 VLCD
VLC3
VLCD
VLCD
GND
GND
Bias
1/2 bias
1/3 bias
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet uPD16431AGC-7ET.PDF ] | |
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