BU97930MUV Datasheet, PDF (12/24 Pages) Rohm – Multifunction Segment Drivers

BU97930MUV,BU97931FV,BU9798KV,BU9798GUW,BU97500KV
Technical Note
●Block diagrams / Pin arrangement / Terminal description
<BU97930MUV>
●Block diagrams
VLCD
LCD voltage
Generator
COM0……COM3 SEG0 …...22、SEG23...26
LED
common
driver
Segment Segment
driver driver/GPO
LED
driver
LCD
BIAS
SELECTOR
common blink timing
counter generator
GPO
Controller
DDRAM
GPO data latch
PW M
Generator
INHb
CLKIN
VDD
VSS
VSS
CR Oscillator
(typ=40.96kHz)
clock
divider
(Div.2)
OSC block
Power On
Reset
Command register
Data Decoder
serial inter face
IF FILTER
CSB
SD
SCL
●Pin arrangement
VSS ⁴⁰
LED ³⁹
SEG26 ³⁸
SEG25 ³⁷
SEG24 ³⁶
SEG23 ³⁵
SEG22 ³⁴
SEG21 ³³
SEG20 ³²
SEG19 ³¹
EXT-PAD
11 _COM3
12 _SEG0
13 _SEG1
14 _SEG2
15 _SEG3
16 _SEG4
17 _SEG5
18 _SEG6
19 _SEG7
20 _SEG8
Fig.5 Block Diagram (BU97930MUV)
Fig.6 Pin Arrangement (BU97930MUV)
●Terminal description
Terminal
Terminal
number
I/O
unused case
CSB
1
I
VDD
Chip select: "L" active
Function
SCL
2
I
VSS
Serial data transfer clock
SD
3
I
VSS
Input serial data
VDD
CLKIN
VSS
4
-
-
Power supply for LOGIC
6
I
OPEN / VSS
External clock input terminal (for display/PWM using selectable)
Support Hi-Z input mode at internal clock mode
40
-
-
GND
VLCD
7
-
INHb
5
I
COM0 ~ 3
8-11
O
-
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
COMMON output for LCD
SEG0 ~ 22
12-34
O
OPEN
SEGMENT output for LCD
SEG23 ~ 26 35-38
O
OPEN
SEGMENT output for LCD/GPO
LED
39
O
OPEN
LED driver output
EXT-PAD
-
-
VSS
substrate
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© 2010 ROHM Co., Ltd. All rights reserved.
12/23
2010.04 - Rev.A