BU9796AFS-E2 Datasheet, PDF (2/32 Pages) Rohm – Standard LCD Segment Driver

BU9796Axxx Series MAX 80 segments (SEG20×COM4)
●Block Diagram / Pin Configuration / Pin Description
BU9796AFS
VDD
VLCD
OSCIN
VSS
LCD voltage generator
COM0……COM3
SEG0…… SEG19
Common
driver
Segment
driver
＋
－
LCD
BIAS
SELECTOR
＋
－
Common
counter
Blink timing
generator
DDRAM
OSCILLATOR
Power On Reset
Command
register
Command
Data Decoder
Serial interface
IF FILTER
SDA
SCL
Datasheet
Figure 2. Block Diagram
Figure 3. Pin Configuration (TOP VIEW)
Terminal
TEST1
TEST2
OSCIN
SDA
Terminal No.
26
27
28
30
Table 1 Pin Description
I/O
Function
I
Test input (ROHM use only)
Must be connect to VSS
Test input (ROHM use only)
I
TEST2=”L”: POR circuit enable
TEST2=”H”: POR circuit disenable,
refer to “Cautions in Power ON/OFF”
External clock input
I External clock and Internal clock can be selected by command.
Must be connect to VSS when use internal oscillation circuit.
I/O serial data in-out terminal
SCL
VSS
VDD
VLCD
SEG0-19
COM0-3
29
25
24
23
31,32
1-18
19-22
I serial data transfer clock
GND
Power supply
Power supply for LCD driving
O SEGMENT output for LCD driving
O COMMON output for LCD driving
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TSZ02201-0A2A0D300100-1-2
13.Jun.2014 Rev.003