LM3537_13 Datasheet, PDF (14/33 Pages) Texas Instruments – 8-Channel WLED Driver with Four Integrated LDOs

LM3537
SNVS634B – JUNE 2011 – REVISED MAY 2013
r_als[4]
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
r_als[3]
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
Table 1. ALS Resistor Values
r_als[2]
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
r_als[1]
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
r_als[0]
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
R_ALS (typ) Value
0.651
0.672
0.695
0.720
0.747
0.776
0.806
0.840
0.876
0.916
0.960
1.01
1.06
1.12
1.19
1.26
1.34
1.44
1.55
1.68
1.83
2.02
2.24
2.52
2.88
3.36
4.03
5.00
6.72
10.1
20.2
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Unit
kΩ
kΩ
kΩ
kΩ
kΩ
kΩ
kΩ
kΩ
kΩ
kΩ
kΩ
kΩ
kΩ
kΩ
kΩ
kΩ
kΩ
kΩ
kΩ
kΩ
kΩ
kΩ
kΩ
kΩ
kΩ
kΩ
kΩ
kΩ
kΩ
kΩ
kΩ
--
Automatic Gain Change
GPO pins of the LM3537 can be configured to serve as a gain control interface for sensors with HW controlled
gain, like ROHM BH1600-series. Please see Table 2. LM3537 changes sensor gain automatically based on
ambient light intensity changes.
REGISTER SETTING
autogain_en = "0"
autogain_en = "1" (enables autogain
functionality) LOW GAIN
autogain_en = "1" (enables autogain
functionality) HIGH GAIN
Table 2. Sensor Gain Control
OUTPUT PIN STATUS
GPO1
GPO2
Can be set to "1" or "0" with REG 52H, bit
gpo1
Can be set to "1" or "0" with REG 52H, bit
gpo2
0
1
1
0
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