AS7058 datasheet(38/199 Pages) AMSOSRAM

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AS7058

Functional description

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DS001077 • v2-00 • 2025-Sep-24

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7.5.2.2

Tripple measurement

The Tripple Measurement function measures three different values within a subsample. The

first measurement is an ambient light measurement with the LED disabled. The result of this

sampling is stored temporarily to the device. The ambient light measurement is followed then

by a measurement where the LED is enabled with the predefined LED current. Its

measurement results is again stored temporarily to the device memory. The last part of a

Tripple Measurement is again an ambient light measurement where the LEDs are disabled. Its

result is also stored temporarily to the device memory and used for the calculation for the final

measurement value which is stored to the FIFO memory. The calculation of the value stored to

the FIFO memory is shown in Equation 2.

Equation 2: Tripple measurement result calculation

�� = ��

�� −

��

��1

−

��

��2

�� … ��

��

�� … �� ℎ��

��

��1 … �� ℎ��

��

��2 … �� ℎ��

The assignment of the photodiodes is for all three measurements the same. The programmed

DAC offset current is used for the second measurement but can also be used for the first and

third measurement (DIS_LEDOFF = 1). Alternatively, it is possible to use also a different value

during the LED off measurement phases which is stored to IOS_LEDOFF register if register

DIS_LEDOFF bit is cleared.

AS7058 Datasheet(PDF) 38 Page - ams-OSRAM AG