BU97930MUV Datasheet, PDF (13/24 Pages) Rohm – Multifunction Segment Drivers

BU97930MUV,BU97931FV,BU9798KV,BU9798GUW,BU97500KV
Technical Note
<BU97931FV>
●Block diagrams
VLCD
LCD voltage
Generator
COM0……COM3 SEG0…..22, SEG23…27
LED
common
driver
Segment Segment
driver driver/GPO
LED
Driver
CLKIN
VDD
VSS
VSS
OSCILLATOR
LCD
BIAS
SELECTOR
common bli nk timing
counter generator
GPO
Controller
DDRAM
GPO data latch
PWM
Generator
P ower On Reset
Command register
Data Decoder
serial inter face
IF FILTER
CSB
SD
SCL
Fig.7 Block Diagram (BU97931FV)
●Pin arrangement
40
21
1
20
Fig.8 Pin Arrangement (BU97931FV)
●Terminal description
Terminal
Terminal
number
I/O
unused case
CSB
26
I
VDD
Chip select: "L" active
Function
SCL
27
I
VSS
Serial data transfer clock
SD
28
I
VSS
Input serial data
VDD
CLKIN
VSS
29
-
-
Power supply for LOGIC
30
I
OPEN / VSS
External clock input terminal (for display/PWM using selectable)
Support Hi-Z input mode at internal clock mode
25
-
-
GND
VLCD
31
-
-
Power supply for LCD
COM0 ~ 3
32-35
O
SEG0 ~ 22
36-40
1-18
O
SEG23 ~ 27
19-23
O
OPEN
OPEN
OPEN
COMMON output for LCD
SEGMENT output for LCD
SEGMENT output for LCD/GPO
LED
24
O
OPEN
LED driver output
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© 2010 ROHM Co., Ltd. All rights reserved.
13/23
2010.04 - Rev.A