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BD6088GUL
(3) Gain control
? Sensor gain switching function is built in to extend the dynamic range.
? It is controlled by register setup.
? When automatic gain control is off, the gain status can be set upin the manual.
Register : GAIN(1:0)
? GC1 and GC2 are outputted corresponding to each gain status.
Technical Note
High Gain mode
Low Gain mode
Ambient
Auto Gain mode
Ambient
Example 1 (Use BH1600FVC)
SBIAS
Example 2
SBIAS
Example 3
SBIAS
Applicationexample
VCC IOUT
BH1600
GC1
SSENS
GC1
SSENS
GC1
SSENS
GC1
GND
GC2
GC2
SGND
GC2
SGND
GC2
SGND
Resister values are relative
Operating mode
GAIN(1:0) setting
Gain status
GC1 output
GC2 output
Auto
00
High Low
L
L
Manual
High Low
01 10
High Low
L
L
Auto
00
High Low
L
L
Manual
High Low
01 10
High Low
L
L
Fixed
11
-
L
: This means that it becomes High with A/D measurement cycle synchronously.
(*1)
: Set up the relative ratio of the resistance in the difference in the brightness change of the High Gain mode and the Low Gain mode carefully.
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? 2011 ROHM Co., Ltd. All rights reserved.
35/51
2011.04 - Rev.A
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