BU97540KV-M Datasheet, PDF (18/70 Pages) Rohm – Multi-function Segment Drivers

BU97540KV-M
4. DR: 1/3 bias drive, 1/2 bias drive or 1/1 bias drive switching control data
This control data bit selects either 1/3 bias drive or 1/2 bias drive.
DR
Bias drive scheme
0
1/3 Bias
1
1/2 Bias
5. SS: Master Clock and Sync output port/Segment output port switching control data
This control data bit switches the functions of the CLKIO/S64 and SYNCIO/S65 output pins between master/slave output and
segment output.
SS
Output Pin State
CLKIO/S64
SYNCIO/S65
0
S64
S65
1
CLKIO
SYNCIO
In Slave Mode, it is automatically set to all segment output and cannot be controlled by Serial Interface.
6. DT: 1/5 duty drive, 1/4 duty drive, 1/3 duty drive or 1/1 duty switching control data
These control data bits select either 1/5 duty drive, 1/4 duty drive, 1/3 duty drive or 1/1 duty (static)
DT0
DT1
Duty drive scheme
0
0
1/1 duty (static) drive
0
0
1/3 duty drive
0
1
1/4 duty drive
1
1
1/5 duty drive
7. FC0, FC1, FC2 and FC3: Common/segment output waveform frame frequency setting control data
These control data bits set the frame frequency for common and segment output waveforms.
FC0
FC1
FC2
FC3
Frame Frequency fo(Hz)
0
0
0
0
fosc^(Note14) / 12288
0
0
0
1
fosc / 10752
0
0
1
0
fosc / 9216
0
0
1
1
fosc / 7680
0
1
0
0
fosc / 6144
0
1
0
1
fosc / 4608
0
1
1
0
fosc / 3840
0
1
1
1
fosc / 3072
1
0
0
0
fosc / 2880
1
0
0
1
fosc / 2688
1
0
1
0
fosc / 2496
1
0
1
1
fosc / 2304
1
1
0
0
fosc / 2112
1
1
0
1
fosc / 1920
1
1
1
0
fosc / 1728
1
1
1
1
fosc / 1536
(Note14)fosc: Internal Oscillation Frequency (600 [kHz] Typ)
8. OC: Internal oscillator operating mode/External clock operating mode switching control data
OC
Operating mode
In/Out pin(OSC_IN/S73) status
0
Internal oscillator
S73 (segment output)
1
External Clock
OSC_IN (clock input)
9. SC: Segment on/off control data
This control data bit controls the on/off state of the segments.
SC
Display state
0
ON
1
OFF
Note that when the segments are turned off by setting SC to “1”, the segments are turned off by outputting segment
off waveforms from the segment output pins.
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TSZ02201-0P4P0D300970-1-2
29.Jun.2015 Rev.002