BU97981KV-E2 Datasheet, PDF (4/50 Pages) Rohm – Multi-function LCD Segment Drivers

BU97981xxx Series MAX 196 segments (SEG49xCOM4)
Block Diagram / Pin Arrangement / Pin Description
Datasheet
BU97981GU
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
Command register
Data Decoder
serial inter face
IF FILTER
CSB
SD
SCL
Figure 6. Block Diagram
Output
Controller
PWMOUT
12345678
H SEG4 SEG5 SEG9 SEG11 SEG14 SEG16 SEG18 SEG20
G SEG2 SEG3 SEG7 SEG8 SEG12 SEG17 SEG19 SEG21
F SEG0 SEG1 SEG6 SEG10 SEG13 SEG22 SEG23 SEG25
E COM2 COM0 COM1 COM3 SEG15 SEG26 SEG24 SEG27
D VLCD VDD INHB SEG47 SEG31 SEG29 SEG28 SEG30
C VSS1 SDA SCL SEG45 SEG42 SEG38 SEG33 SEG32
B (NC) CLKIN VSS2 SEG44 SEG40 SEG39 SEG35 SEG34
A
PWM
CSB
SEG48 SEG46 SEG43 SEG41 SEG37 SEG36
OUT
Figure 7. Pin Configuration (TOP VIEW)
Terminal
I/O
CSB
I
SCL
I
SD
I
VDD
-
CLKIN
I
VSS1
-
VLCD
-
INHb
I
PWMOUT
O
COM0 to 3
O
SEG0 to 14
O
SEG15 to 45 O
SEG46 to 48 O
VSS2
-
Table 3. Pin Description
Unused case
-
-
-
-
OPEN / VSS
-
-
VDD
OPEN
OPEN
OPEN
OPEN
OPEN
GND
Function
Chip select: "L" active
Serial data transfer clock
Input serial data
Power supply for LOGIC
External clock input terminal (for display/PWM using selectable)
Support Hi-Z input mode at internal clock mode
GND
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
COMMON output for LCD
SEGMENT output for LCD
SEGMENT output for LCD/GPO
SEGMENT output for LCD/LED driver
GND (for SEG46-48 / LED driver)
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10.Apr.2015 Rev.006