AS7150 datasheet(31/159 Pages) AMSOSRAM

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AS7150

Functional description

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The LED input channel current settings can be configured with SEQ2_LED1_CURR,

SEQ2_LED2_CURR and SEQ2_LED3_CURR along with the LED assignments for each

subsample in LED_SEQ2_SUBx registers.

The integration time is also for both ADCs the same and is controlled via register

SEQ2_SEL_ORDER as well as decimation rates between 16, 32, 64, 128 and 256 via register

SEQ2_SINC_DEC. To maintain best dynamic range and noise behavior it is also important

that the current range for ADC1 and ADC2 is configured accordingly. Each ADC signal path

supports seven full-scale range settings of 1µA, 2µA, 4µA, 8µA, 16µA, 32µA, and 64µA which

can be configured in register MOD1_SEQ2_IREF and MOD2_SEQ2_IREF for sequencer 2.

Individual configurations for both ADCs are the photodiode assignments via register

PD_SEQ2_SUBx as well as the offset DAC currents for ambient light rejection which can be

configured via AOC_MOD1_SEQ2_SUBx registers.

Figure 21: Sequencer 2 sample structure and configuration options

Sequencer 2

e.g. Proximity

Force

Sample

Force

Sample

Force

Sample

Force

Sample

Sequencer 1 Sample Period

Sequencer 2 Sample Period

Prox

Sample

Prox

Sample

Base Period

Subsample

Current settings LED input channel 1 –

ADC 1 and ADC 2 integration time

SUB 1 LED

Selection

SUB 2 LED

Selection

SUB 3 LED

Selection

SUB 4 LED

Selection

ADC 1 input current range

SUB 1

ADC 1 PD

Selection

SUB 2

ADC 1 PD

Selection

SUB 3

ADC 1 PD

Selection

SUB 4

ADC 1 PD

Selection

ADC 2 input current range

SUB 1

ADC 2 PD

Selection

SUB 2

ADC 2 PD

Selection

SUB 3

ADC 2 PD

Selection

SUB 4

ADC 2 PD

Selection

Sequencer 2

Sample Structure and Configuration

SUB 1

ADC 1

DAC Offset

SUB 2

ADC 1

DAC Offset

SUB 3

ADC 1

DAC Offset

SUB 4

ADC 1

DAC Offset

Sequencer 1

e.g. Force Measurement

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