BU97981KV-E2 Datasheet, PDF (2/50 Pages) Rohm – Multi-function LCD Segment Drivers

BU97981xxx Series MAX 196 segments (SEG49xCOM4)
Block Diagram / Pin Arrangement / Pin Description
BU97981KV
VLCD
VSS2
COM0……COM3 SEG0 ……………………………… SEG48
LCD voltage
Generator
Ref Voltage
Circuit
Vreg
LCD
BIAS
SELECTOR
common
driver
Segment Segment Segment
driver driver/GPO driver/LED
GPO/LED
Controller
common blink timing
counter generator
DDRAM
GPO data latch
PWM
Generator
INHb
CLKIN
VDD
VSS
VSS
OSCILLATOR
Power On Reset
TEST1
Command register
Data Decoder
serial inter face
IF FILTER
CSB
SD
SCL
Output
Controller
PWMOUT
49
SEG36
SEG37
SEG38
SEG39
SEG40
SEG41
SEG42
SEG43
SEG44
SEG45
SEG46
SEG47
SEG48
VSS2
PWMOUT
CLKIN
64
Datasheet
32
SEG19
SEG18
SEG17
SEG16
SEG15
SEG14
SEG13
SEG12
SEG11
SEG10
SEG9
SEG8
SEG7
SEG6
SEG5
SEG4
17
Figure 2. Block Diagram
Figure 3. Pin Configuration (TOP VIEW)
Table 1. Pin Description
Terminal
CSB
Terminal
number
I/O
Unused case
1
I
-
Chip select: "L" active
Function
SCL
2
I
-
Serial data transfer clock
SD
3
I
-
Input serial data
VDD
CLKIN
TEST1
4
-
-
Power supply for LOGIC
64
I
OPEN / VSS
External clock input terminal (for display/PWM using selectable)
Support Hi-Z input mode at internal clock mode
5
I
-
TEST terminal (Please connect VSS terminal)
VSS1
6
-
-
GND
VLCD
8
-
-
Power supply for LCD
Display turning on/off select terminal
H: turning on display, L: turning off display
INHb
7
I
VDD
INHb = “L”: All SEG/COM terminal : output VSS level
GPO terminal : output VSS level
LED drive terminal : output Hi-Z
PWMOUT
63
O
OPEN
PWM output for LED2 group
COM0 to 3
9 to 12
O
OPEN
COMMON output for LCD
SEG0 to 14 13 to 27
O
OPEN
SEGMENT output for LCD
SEG15 to 45 28 to 58
O
OPEN
SEGMENT output for LCD/GPO
SEG46 to 48 59 to 61
O
OPEN
SEGMENT output for LCD/LED driver
VSS2
62
-
GND
GND (for SEG46-48 / LED driver)
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111ï½¥15ï½¥001
2/46
TSZ02201-0A2A0D300110-1-2
10.Apr.2015 Rev.006