BU91520KV-M Datasheet, PDF (34/45 Pages) Rohm – Low Duty LCD Segment Driver

BU91520KV-M
INHb Pin and Display Control
Since the IC internal data (1/4-Duty: the display data D1 to D276 and the control data, 1/3-Duty: the display data D1 to D207
and the control data) is undefined when power is first applied, applications should set the INHb pin low at the same time as
power is applied to turn off the display (This sets the S1/P1/G1 to S6/P6/G6, S7 to S69, COM1 to COM4 to the VSS level.) and
during this period send serial data from the controller. The controller should then set the INHb pin high after the data transfer
has completed. This procedure prevents meaningless displays at power on.
1. 1/4-Duty
(Note22) t1≥0, tc: min 10us
2. 1/3-Duty
Figure 28. Power ON/OFF and INHb Control Sequence (1/4-Duty)
(Note23) t1≥0, tc: min 10us
Figure 29. Power ON/OFF and INHb Control Sequence (1/3-Duty)
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TSZ22111・15・001
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TSZ02201-0P4P0D301340-1-2
22.Jan.2016 Rev.001