AS7058 datasheet(56/199 Pages) AMSOSRAM

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AS7058

Functional description

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DS001077 • v2-00 • 2025-Sep-24

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7.9

FIFO description

The AS7058 contains a 1.5 kB FIFO register for buffering the measurement data output to an

external microcontroller via the I²C or SPI interface. The FIFO buffering allows the external

MCU to stay in idle mode during energy-saving measurements.

The measurement data of the three channels and possible status information from the AAOC

will be collected in a common data stream and written to the FIFO. The coding of the data

stream is described below in Figure 49.

Figure 49: FIFO data format

Table 12: FIFO data marker bit description

Data marker bits <2:0>

Description

‘b’000

First ADC value of modulator 1 (PPG1)

‘b’001

Other ADC value of modulator 1 (PPG1)

‘b’010

First ADC value of modulator 2 (PPG2)

‘b’011

Other ADC value of modulator 2 (PPG2)

‘b’100

ADC data sequence 1/Sub 1 MOD3 (ECG)

‘b’101

ADC data sequence 1/Sub 2 MOD3 (ECG)

‘b’110

ADC data sequence 2 ECG channel

‘b’111

Status information

Block frame

1 Bit

Data marker

3 Bit

ADC data

20 Bit

ADC data / Status information

FIFO Data Format

AS7058 Datasheet(PDF) 56 Page - ams-OSRAM AG