BU97930MUV Datasheet, PDF (15/24 Pages) Rohm – Multifunction Segment Drivers

BU97930MUV,BU97931FV,BU9798KV,BU9798GUW,BU97500KV
Technical Note
<BU9798GUW>
●Block diagrams
VLCD
LCD voltage
Generator
Ref Voltage
Circuit
Vreg
VSS2
COM0……COM3 SEG0 ……………………………… SEG48
common
driver
Segment Segment Segment
driver driver/GPO driver/LED
LCD
BIAS
SELECTOR
common blink timing
counter generator
GPO/LED
Controller
DDRAM
GPO data latch
PWM
Generator
INHb
CLKIN
VDD
VSS
VSS
OSCILLATOR
Power On Reset
Command register
Data Decoder
serial inter face
IF FILTER
CSB
SD
SCL
Output
Controller
PWMOUT
●Pin arrangement
1
2
3
4
5
6
7
8
H
SEG
4
SEG
5
SEG
9
SEG
11
SEG
14
SEG
16
SEG
18
SEG
20
G
SEG
2
SEG
3
SEG
7
SEG
8
SEG
12
SEG
17
SE
G19
SEG
21
F
SEG
0
SEG
1
SEG
6
SEG
10
SEG
13
SEG
22
SEG
23
SEG
25
E
COM COM COM COM
2
0
1
3
SEG
15
SEG
26
SEG
24
SEG
27
D VLCD VDD
INHB
SEG
47
SEG
31
SEG
29
SEG
28
SEG
30
C VSS1 SDA
SCL
SEG
45
SEG
42
SEG
38
SEG
33
SEG
32
B
(NC)
CLK
IN
VSS2
SEG
44
SEG
40
SEG
39
SEG
35
SEG
34
A
CSB
PWM
OUT
SEG
48
SEG
46
SEG
43
SEG
41
SEG
37
SEG
36
Fig.11 Block Diagram (BU9798GUW)
Fig.12 Pin Arrangement (BU9798GUW)
●Terminal description
Terminal
I/O
CSB
I
SCL
I
SD
I
VDD
-
CLKIN
I
VSS1
-
VLCD
-
INHb
I
PWMOUT
O
COM0 ~ 3
O
SEG0 ~ 14
O
SEG15 ~ 45
O
SEG46 ~ 48
O
VSS2
-
Unused
case
VDD
Chip select: "L" active
Function
VSS
Serial data transfer clock
VSS
Input serial data
-
Power supply for LOGIC
OPEN / VSS
External clock input terminal (for display/PWM using selectable)
Support Hi-Z input mode at internal clock mode
-
GND
-
VDD
OPEN
Power supply for LCD
Display turning on/off select terminal
H: turning on display, L: turning off display
INHb = “L”: All SEG/COM terminal : output VSS level
GPO terminal : output VSS level
LED drive terminal : output Hi-Z
PWM output for LED2 group
OPEN
COMMON output for LCD
OPEN
SEGMENT output for LCD
OPEN
SEGMENT output for LCD/GPO
OPEN
SEGMENT output for LCD/LED driver
GND
GND (for SEG46-48 / LED driver)
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15/23
2010.04 - Rev.A