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ALS-PDIC17-57B-TR8_15 Datasheet, PDF (12/21 Pages) Everlight Electronics Co., Ltd – Digital Ambient Light Sensor
DATASHEET
SMD  I2C Digital Ambient Light Sensor
ALS-PDIC17-57B/TR8
Theory of Operation
The photocurrent, generated by the built-in photodiode while being illuminated, is proportionally converted to
frequency; the digital frequency signal is then integrated by a 15-bit counter for a predetermined period of time (Tint).
This period of time is called integration time which can be adjusted by changing the nominal value of the resistor
between the RINT and GND terminals. The converted data are read out through a two-wire, I2C Interface bus. Since the
photodiode has been specially processed to suppress the spectral response in infrared region, the readout is very close
to the photopic transfer function, v(λ), which is the mathematic expression of human-eye's response to ambient light.
Address Option for I2C
The device address is 0x29.
ADC Register
The ADC register contains 16 bits with a 15-bit wide data from D0 to D14 and a valid bit D15. The register is
divided into two groups; D[15..8] is the most significant (MS) byte and D[7..0] is the least significant (LS) byte. See Table
2 for details.
Valid Bit
Data Bits
D15
D14
D13 ~ D8
D7~D1
D0
MSB
LSB
Most Significant (MS) byte
Least Significant (LS) byte
Table 1 ADC Register Structure
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