BU91799KV-M Datasheet, PDF (2/29 Pages) Rohm – Low Duty LCD Segment Driver for Automotive Application

BU91799KV-M MAX 200 segments (SEG50×COM4)
Block Diagram / Pin Configuration / Pin Description
COM0 …… COM 3 SEG0 … SEG 49
VLCD
LCD voltage generator
Common
Driver
Segment
Driver
＋
－
＋
LCD
－
BIAS
SELECTOR
Common
Counter
Blink Timing
Generator
DDRAM
＋
－
INHb
OSCIN
VDD
VSS
VSS
OSCILLATOR
Power On Reset
Command
Register
Command
Data Decoder
Serial Interface
IF FILTER
49
SEG38
SEG39
SEG40
SEG41
SEG42
SEG43
SEG44
SEG45
SEG46
SEG47
SEG48
SEG49
COM0
COM1
COM2
COM3
64
32
SEG21
SEG20
SEG19
SEG18
SEG17
SEG16
SEG15
SEG14
SEG13
SEG12
SEG11
SEG10
SEG9
SEG8
SEG7
SEG6
17
Pin Name
INHb
TEST1
NC
TEST 1
SDA
SCL
Figure 2. Block Diagram
Figure 3. Pin Configuration (TOP VIEW)
Table 1 Pin Description
Pin No.
8
9
I/O
Function
Input terminal for display control
I VDD: Display enable
VSS: Display disenable
POR enable setting
I VDD: POR disenable ^(Note)
VSS: POR enable
Handling
when unused
VDD
VSS
10
- Non connection
OPEN
NC
OSCIN
SDA
5
- Non connection
OPEN
External clock input
4
I External clock and Internal clock modes can be selected by command
VSS
Must be connected to VSS when using internal oscillator.
7
I/O Serial data in-out terminal
-
SCL
6
I Serial clock terminal
-
VSS
3
GND
-
VDD
2
Power supply
-
VLCD
1
Power supply for LCD driving
-
SEG0-49
11-60
O SEGMENT output for LCD driving
OPEN
COM0-3
61-64
O COMMON output for LCD driving
OPEN
(Note) This function is guaranteed by design, not tested in production process. Software Reset is necessary to initialize IC in case of TEST1=VDD.
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TSZ02201-0P4P0D301050-1-2
8. Feb. 2016 Rev.001