|
BU97931FV-LB Datasheet, PDF (17/32 Pages) Rohm – Multifunction LCD Segment Driver | |||
|
◁ |
BU97931FV-LB MAX 112 segments (SEG28ÃCOM4)
Datasheet
14. OSC external input command (OSCSET)
MSB
LSB
D/C D6 D5 D4 D3 D2 D1 D0 Hex
1st byte Command
1
0
0
1
1
0
0
0 98h
2nd byte Command
0
0
0
0
0 P2 P1 P0
-
Reset
-
00h
Sets the type of clock mode. There are 4 selectable modes including external clock input mode.
Details of this command function are as follows.
Condition
Internal CLK (PWM generation OFF)
External CLK input for PWM (PWM generation OFF)
Internal CLK (PWM generation ONï¼
External CLK input for PWM (PWM generation ON)
External CLK input for Display (ROHM use only)
(*: Donât care)
P2 P1 P0
0
0
0
0
0
1
0
1
0
0
1
1
1
*
*
Reset state
â
(P2, P1, P0) = (0, 0, 1): External PWM input mode
CLKINï¼external PWM input available.
PWMOUT: âLâ Output
(Note) under the (P2, P1, P0) = (0, 0, 0) condition PWMOUT into same state
(P2, P1, P0) = (0, 1, 0): PWM is generated from an internal oscillating frequency
(P2, P1, P0) = (0, 1, 1): PWM is generated from an External CLK input from CLKIN
PWM width is set up by PWMSET and PWMSET command.
In case LED is used as back light of LCD panel and PWM is generated from internal clock, display flickering will
occur. In this case, please use under the PWM width ALLâLâ or ALL âHâ setting only.
The relation of OSC function control by each command is as follows:
CLKIN terminal
External clock
External PWM
Integrated OSC
PWM
generation
OSCSET
command
PWMSET
command
Figure 10. OSC External Input
LED
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111ï½¥15ï½¥001
17/29
TSZ02201-0P4P0D300490-1-2
26.Feb.2014 Rev.002
|
▷ |