BU91510KV-M Datasheet, PDF (23/32 Pages) Rohm – Multi- function LCD Segment Drivers

BU91510KV-M
Datasheet
Oscillation Stabilization Time of the Internal Oscillation Circuit
It must be noted that the oscillation of the internal oscillation circuit is unstable for a maximum of 100μs (oscillation stabilization
time) after oscillation has started.
Internal
oscillation
circuit
Oscillation stopped
Oscillation
stabilization time
(100 [us] max.)
Oscillation operation
(under normal conditions)
<Oscillation start>
1.If the INHb pin status is switched from "L" to "H"
when control data OC = "0" and BU ="0"
2.If the control data BU is set from "1" to "0"
when INHb = "H" and control data OC ="0"
Figure 17. Oscillation Stabilization Time
Voltage Detection Type Reset Circuit (VDET)
The Voltage Detection Type Reset Circuit generates an output signal and resets the system when power is applied for
the first time and when voltage drops (that is, for example, the power supply voltage is less than or equal to the power
down detection voltage (VDET = 1.8V typ.). To ensure that this reset function works properly, it is recommended that a
capacitor must be connected to the power supply line so that both the power supply voltage (VDD) rise time when power
is first applied and the power supply voltage (VDD) fall time when the voltage drops are at least 1ms.
t1
t2
VDD
Figure 18. VDET Detection Timing
Power supply voltage VDD rise time: t1 > 1ms
Power supply voltage VDD fall time: t2 > 1ms
Reset Condition
When BU91510KV-M is initialized, the internal status after power supply has been reset as the following table.
Table 1. control data reset condition
Instruction
At Reset Condition
S1/P1/G1 to S2/P2/G2 pin
[P0,P1,P2]=[0,0,0]:all segment output
LCD bias
DR=0:1/3-Bias
LCD duty
DT=0:1/4-Duty
DISPLAY frequency
[FC0,FC1,FC2]=[0,0,0]:fosc/6144
Display clock mode
OC=0:Internal oscillator
LCD display
SC=1:OFF
Power mode
PWM/GPO output
BU=1:Power saving mode
PGx=0:PWM output(x=1～6)
PWM frequency
[PF0,PF1,PF2,PF3]=[0,0,0,0]: fosc /2048
PWM duty
[Wn0～Wn5]=[0,0,0,0,0,0]
:(1/64)xTp(n=1～6,Tp=1/fp)
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111ï½¥15ï½¥001
23/28
TSZ02201-0P4P0D301130-1-2
8.July.2015 Rev.001