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  4. ams OSRAM — AS7058 Analog Front End (AFE) For Multi-Vital Sign Monitoring

ams OSRAM — AS7058 Analog Front End (AFE) For Multi-Vital Sign Monitoring

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ams OSRAM AS7058 Analog Front End (AFE)

Geared for precise multi-vital sign monitoring

The AS7058 by ams OSRAM is an integrated multi-vital sign monitoring device, which provides a complete photoplethysmogram (PPG), electrocardiogram (ECG), body impedance (BioZ), and electrodermal activity (EDA).

The AS7058 has a DC and AC lead-off detection for the ECG, a flexible clock system, and a PLL. All three inbuilt ADCs are synchronized. The device is available in a 42-ball wafer-level chip scale package (WLCSP) with dimensions 2.82 x 2.55 mm and operates over the temperature range -40 °C to 85 °C.

The PPG acquisition system provides up to eight LEDs and eight photodiode inputs. The LEDs are powered by two high current 8-bit programmable LED drivers with four current ranges. Additionally, a special laser safety support system can be enabled, which offers the possibility to use VCSEL die as a light source. The photodiodes can be read out synchronously with two 20-bit ADCs. As the second product in the AS705x family, the AS7058 includes a new method of ambient light suppression method called advanced automatic offset control (AAOC). This method enables the system to adjust towards the ambient light situation before the actual measurement starts and minimizes the loss of data due to the saturation influence by ambient light.

The ECG channel has high-input impedance, low noise, high CMRR, programmable gain, an anti-aliasing low-pass filter, and a high-resolution 20-bit ADC. It is designed according to IEC 60601-2-47 Ambulatory ECG Systems monitoring compliance requirements. The BioZ channel has a low-pass filter and a calibration routine available. The channel also has high input impedance, low noise, programmable gain, low-pass and high-pass filter options, and shares the high-resolution ADC with the ECG system. Several ranges of excitation current and frequencies are also available.

Benefits

  • Highly flexible LED/photodiode configuration
  • Allows the smallest application size e.g. narrow HRM measurement band
  • Electrocardiogram (ECG) with dry electrodes
  • Enables blood pressure measurements
  • Outstanding HRM measurement quality
  • Measuring the body composition and the skin’s water content
  • Long operating time
  • Long power operating mode
  • Acquiring several bio signals in parallel
  • Improvements in ambient light suppression

Features

  • Up to 8 LED output pins and 8 photodiode input pins
  • Small Wafer-Level-Chip-Scale-Package (WLCSP)
  • Embedded low-noise analog front-end for ECG signal acquisition
  • Synchronized PPG and ECG acquisition
  • Low noise analog front end for PPG acquisition
  • An independent body impedance and an electrodermal activity system are included
  • A hardware sequencer to offload the processor with an adjustable LED driver with current control
  • Two PPG channels usable in parallel mode are available
  • Either ECG, BIOZ or EDA (GSR) and two PPG channels, separated and usable simultaneously
  • Includes a new type of offset cancelation for the PPG signal: Advanced Automatic Offset Control

Applications

  • Wearable vital sign monitors
  • Fitness band
  • Smart watch
  • Heart rate monitor
  • Hearables
  • ECG monitoring

 

  • Medical patches
  • Pulse-oximetry devices
  • Single- and multi-frequency body impedance devices
  • Pulse Arrival Time (PAT), Pulse Transit Time (PTT), Pulse Wave Velocity (PWV)
  • Assessments

 

Block Diagram

ams OSRAM AS7058 Block Diagram

Evaluation Kit
AS7058


User Guide

The AS7058 Eval Kit is designed to evaluate all functions of the AS7058 biosensor and test them in various applications. The AS7058 Eval Kit works with USB connection to the PC and comes with a GUI, which enables the user to change register settings and see measurement results. Any signals important for development can be probed easily at the pin headers.

 


ams OSRAM AS7058 AFE