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ISL29125EVAL1Z Datasheet(PDF) 10 Page - Intersil Corporation

Part # ISL29125EVAL1Z
Description  Digital Red, Green and Blue Color Light Sensor with IR Blocking Filter
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL29125EVAL1Z Datasheet(HTML) 10 Page - Intersil Corporation

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ISL29125
10
FN8424.2
January 24, 2014
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RGB Operating Modes [B2:B0]
This device has various RGB operating modes. These modes are
selected by setting B2:B0 bits in Table 4. The device powers up on
a disable mode. All operating modes are in continuous ADC
conversion. The following bits are used to enable the operating
mode
RGB Data Sensing Range [B3]
The Full Scale RGB Range has two different selectable ranges at
bit 3. The range determines the ADC resolution (12 bits and
16 bits). Each range has a maximum allowable lux value. Higher
range values offer better resolution and wider lux value.
ADC Resolution [B4]
ADC’s resolution and the number of clock cycles per conversion is
determined by this bit in Table 6. Changing the resolution of the
ADC, changes the number of clock cycles of the ADC which in turn
changes the integration time. Integration time is the period the
ADC samples the photodiode current signal for a measurement
RGB Start Synced at INT Pin
SYNC has two different selectable modes at bit 5. B5 sets to 0
then the INT pin gets asserted whenever the sensor interrupts. B5
sets to 1 then the INT pin becomes input pin. On the rising edge
at INT pin, SYNC starts ADC conversion. The INT pin sets to
interrupt mode by default. More information about SYNC at
“Principles of Operation” on page 6.
Configuration-2 Register (Address: 0x02)
ACTIVE INFRARED (IR) COMPENSATION
The device is designed for operation under dark glass cover which significantly attenuates visible light and pass the infrared light
without much attenuation. The device has an on chip passive optical filter designed to block (reject) most of the incident Infra Red. In
addition, the device provides a programmable active IR compensation which allows fine tuning of residual infrared components from
the output which allows optimizing the measurement variation between differing IR-content light sources. B7 is “IR Comp Offset” and
B[5:0] is “IR Comp Adjust” which provides means for adjusting IR compensation. B7=‘0’ + B[5:0] is the effective IR compensation from
0 to 63 codes and B7set to ‘1’+B[5:0] the effective IR compensation is from 106 to 169. Table 9 shows lightweight for each IR
compensation bit and Figure 12 is a typical system measure for both IR Comp Adjust and IR Comp Offset. More detail about how to IR
compensation, see IR compensation in “Applications Information” on page 13.
Recommended to set BF at register 0x02 to max out IR compensation value. It make High range reach more than 10,000lux.
TABLE 4. OPERATION MODES
B2:B0
OPERATION
000
Power Down (ADC conversion)
001
GREEN Only
010
RED Only
011
BLUE Only
100
Stand by (No ADC conversion)
101
GREEN/RED/BLUE
110
GREEN/RED
111
GREEN/BLUE
TABLE 5. SENSING RANGES
B3
RANGES
0
375 lux
1
10,000 lux
TABLE 6. ADC RESOLUTIONS
B4
RESOLUTION
016 bits
112 bits
TABLE 7. SYNCED AT INT
B5
OPERATION
0
ADC start at I2C write 0x01
1
ADC start at rising INT
TABLE 8. CONFIGURATION-2
NAME
REGISTER ADDRESS
REGISTER BITS
DEFAULT ACCESS
DEC
HEX
B7
B6
B5
B4
B3
B2
B1
B0
Configuration-2
2
0x02
IR-COM RESERVED ALSCC[5] ALSCC[4] ALSCC[3] ALSCC[2] ALSCC[1] ALSCC[0]
0x00
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