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AS7038RB

Functional Description

Datasheet

• PUBLIC

DS000726

• v2-00 • 2021-Jun-02

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│ 45

Information

The integration time tINT is defined either by the sequencer (man_mode=0) of manually

through the bit sw_itg if man_mode=1. For the synchronous demodulator only use the

resistive feedback.

7.1.8

Optical Front End Operating Modes

Once the photodiode amplifier is configured the measurement can be done in two different ways.

Either the LED-outputs, the photodiode amplifier and the ADC are controlled manually by means of

Manual Operation of the Optical Frontend:

The optical front end can be manually controlled via the register man_mode=1

Figure 39:

Optical Frontend

(1)

Applies only if man_mode=1

For manual operation of the LEDs and its current sinks see 7.1.1 LED-Driver

7.1.9

Sequencer

In order to synchronize the LED-currents, the integration time and the ADC-sampling time, a built in

sampling sequencers can be used. The sequencer generates the 8-bit-timings based on a 1 µs clock

pd_ampcap

pd_ampres

pd_amp_en

man_sw_itg

pd1

pd2

pd3

pd4

pdi_1

pdi_0

ADC

adc_channel_mask_tia

is set?

Start conversion:

seq_en=1

End of conversion: seq_en returns to 0

pdoffx

pdoffx_ledon

any LED on?

GPIO0

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