An Evaluation System for the TSL2560/61 Ambient Light Sensor
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currents to digital outputs. Channel 1 digital output is used to compensate for the effect of the
infrared component of light on the channel 0 digital output. The ADC digital outputs from the two
channels are used in the formula below to obtain a value that approximates the human eye response
in the commonly used illuminance unit of Lux:
Chipscale Package
For 0 < CH1/CH0 <= 0.52
Lux = 0.0315 X CH0
−
0.0593 X CH0 X ((CH1/CH0)
1.4
)
For 0.52 < CH1/CH0 <= 0.65
Lux = 0.0229 X CH0
−
0.0291 X CH1
For 0.65 < CH1/CH0 <= 0.80
Lux = 0.0157 X CH0
−
0.0180 X CH1
For 0.80 < CH1/CH0 <= 1.30
Lux = 0.00338 X CH0
−
0.00260 X CH1
For CH1/CH0 > 1.30
Lux = 0
TMB Package
For 0 < CH1/CH0 <= 0.50
Lux = 0.0304 X CH0
−
0.062 X CH0 X ((CH1/CH0)
1.4
)
For 0.50 < CH1/CH0 <= 0.61
Lux = 0.0224 X CH0
−
0.031 X CH1
For 0.61 < CH1/CH0 <= 0.80
Lux = 0.0128 X CH0
−
0.0153 X CH1
For 0.80 < CH1/CH0 <= 1.30
Lux = 0.00146 X CH0
−
0.00112 X CH1
For CH1/CH0 > 1.30
Lux = 0
