BU9796AFS-E2 Datasheet, PDF (3/32 Pages) Rohm – Standard LCD Segment Driver

BU9796Axxx Series MAX 80 segments (SEG20×COM4)
●Block Diagram / Pin Configuration / Pin Description- continued
BU9796AMUV
Datasheet
VDD
VLCD
OSCIN
VSS
LCD voltage generator
COM0 ……COM3 SEG0…… SEG11
Common
driver
Segment
driver
＋
－
LCD
BIAS
SELECTOR
＋
－
Common Blink timing
counter generator
DDRAM
OSCILLATOR
Power On Reset
Command
register
Command
Data Decoder
Serial interface
IF FILTER
SDA
SCL
TEST2 ²⁴
TEST1 ²³
VSS ²²
VDD ²¹
VLCD ²⁰
COM3 ¹⁹
EXT-PAD
7 _SEG3
8 _SEG4
9 _SEG5
10 _SEG6
11 _SEG7
12 _SEG8
Figure 4. Block Diagram
Figure 5. Pin Configuration (BOTTOM VIEW)
Terminal
TEST1
TEST2
OSCIN
SDA
Terminal No.
23
24
1
3
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
2
I serial data transfer clock
VSS
22
GND
VDD
21
Power supply
VLCD
20
Power supply for LCD driving
SEG0-11
4-15
O SEGMENT output for LCD driving
COM0-3
16-19
O COMMON output for LCD driving
EXT-PAD
-(*1)
- Substrate
*1: To radiate heat, please contact a board with the EXT-PAD which is located at the bottom side of
VQFN024V4044 package.
Please supply VSS level or Open state as the input condition for this PAD.
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TSZ02201-0A2A0D300100-1-2
13.Jun.2014 Rev.003