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BD6088GUL
Technical Note
(4) A/D conversion
? The detection of ambient data is done periodically for the low power.
? SBIAS and ADC are turned off except for the ambient measurement.
? The sensor current may be shut in this function, it can possible to decrease the current consumption.
? SBIAS pin and SSENS pin are pull-down in internal when there are OFF.
? SBIAS circuit has the two modes. (Usually ON mode or intermittent mode)
Register : ADCYC(1:0)
Register : SBIASON
16 times
ALCEN
ADCYC(1:0)
ADC Cycle
SBIAS Output
ADC Movement
T wait= 64ms(typ)
(Wait time)
When SBIASON=1
GC1, GC2
T AD= 16.4ms(typ)
(A/D conversion time)
GC1, GC2=00
AD start signal
T ADone= 1.024ms(typ)
AMB(3:0)
AMB(3:0)
16 times measurement
T oprt= 80.4ms(typ)
(Operate time)
(5) ADC data Gain / offset adjustment
? To correct the characteristic dispersion of the sensor,
Gain and offset adjustment to ADC output data is possible.
? They are controlled by register setup.
Register : SGAIN(3:0)
Register : SOFS(3:0)
< Gain Adjustment >
Gain adjustment
SGAIN(3:0)
Ambient
Ambient
Ambient
< Offset Adjustment >
Offset adjustment
SOFS(3:0)
Ambient
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? 2011 ROHM Co., Ltd. All rights reserved.
Ambient
36/51
Ambient
2011.04 - Rev.A
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