BU91797MUF-M Datasheet, PDF (2/27 Pages) Rohm – Low Duty LCD Segment Driver for Automotive application

BU91797MUF-M MAX 144 segments (SEG36×COM4)
Block Diagram / Pin Configuration / Pin Description
Datasheet
VDD
VLCD
OSCIN
VSS
LCD voltage generator
COM0……COM3 SEG0…… SEG35
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
TEST1
TEST2
SDA
SCL
Figure 2. Block Diagram
COM1 37
COM2 38
COM3 39
VLCD
40
VDD
41
VSS
42
TEST1 43
OSCIN 44
SCL
45
SDA
46
TEST2 47
SEG0
48
EXT-PAD
24
SEG24
23
SEG23
22
SEG22
21
SEG21
20
SEG20
19
SEG19
18
SEG18
17
SEG17
16
SEG16
15
SEG15
14
SEG14
13
SEG13
Figure 3. Pin Configuration (TOP VIEW)
Pin Name
TEST1
TEST2
OSCIN
SDA
Table 1. Pin Description
Pin No. I/O Function
43
I
Test input (ROHM use only)
Must be connected to VSS
POR enable setting
47
I
VDD: POR disenable ^(Note1)
VSS: POR enable
External clock input
44
I
External clock and Internal clock can be selected by command
Must be connected to VSS when using internal oscillator
46
I/O Serial data in-out terminal
Handling
when unused
VSS
VSS
VSS
-
SCL
45
I
Serial clock terminal
-
VSS
42
-
GND
-
VDD
41
-
Power supply
-
VLCD
SEG0 to 35
COM0 to 3
40
1-35,
48
36-39
-
Power supply for LCD driving
O SEGMENT output for LCD driving
O COMMON output for LCD driving
-
OPEN
OPEN
EXT-PAD
-^(Note2)
-
Substrate
OPEN/VSS
(Note1) This function is guaranteed by design, not tested in production process. Software Reset is necessary to initialize IC in case of TEST2=VDD.
(Note2) To radiate heat, Contact a board with the EXT-PAD which is located at the bottom side of VQFN48FV7070 package.
Supply VSS level or Open state as the input condition for this PAD.
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TSZ02201-0P4P0D301040-1-2
21.Dec.2015 Rev.001