AS7058 datasheet(23/199 Pages) AMSOSRAM

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AS7058

Functional description

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DS001077 • v2-00 • 2025-Sep-24

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Functional description

The AS7058 is an integrated data acquisition system ideal for several applications, including

optical heart rate measurement and pulse oximetry, ECG, respiration rate calculation, body

impedance analysis (BIA), and numerous other applications. It is designed to fulfill the

requirements of the consumer healthcare market and the medical industry.

The PPG data acquisition system supports up to eight LEDs and eight photodiode inputs and

includes two high-resolution optical readout channels with a new ambient light cancelation

feature and two high-current LED drivers to complete the system.

The ECG channel has high input impedance, low noise, high CMRR, programmable gain,

right-leg drive, lead-off detection, and a high-resolution channel.

The BioZ channel has an independent circuit to inject current into the body and to measure

voltage in return. The system contains four pins, which can be freely combined for two-

electrode current injection and two-electrode voltage measurement. The injected current is

programmable and available over a wide frequency range (1 kHz to 1 MHz) and a wide range

of current magnitudes (200 nA up to 100 µA). These ranges support GSR (galvanic skin

response), electrodermal activity (EDA) measurements, and BIA applications.

The BioZ Channel also has high input impedance, low noise, high CMRR, programmable gain,

various low-pass and high-pass filter options, a high-resolution ADC, and I and Q

measurement capability to provide magnitude and phase measurements for BIA applications.

A calibration routine to lower the external components needed is also available.

The AS7058 is fully programmable by the registers, and the digital output data is stored in a

512-word FIFO. The FIFO allows the device to be connected to a microcontroller or processor

on a shared I²C or SPI bus. They both operate in fully autonomous mode for low-power battery

applications.

The device works on a 1.8 V main supply voltage and up to 5.5 V at the LED pins. They both

have flexible timing and shutdown configurations, as well as control of individual blocks to

minimize the total power consumption during downtime to optimize the measurement with

securing a high accuracy.

AS7058 Datasheet(PDF) 23 Page - ams-OSRAM AG