ams AS7057 Medical and Health Sensor - Analog Frontend

Description

The AS7057 Biosignal Sensor Analog Frontend (AFE) is the next generation Vital Sign Sensor. It enables the user to detect biosignals such as photoplethysmogram (PPG) and pulse transit time (PTT), as well as proximity. PPG is the most used HRM method. It measures the pulse rate - by sampling light modulated by the blood vessels, which expand and contract as blood pulses through them. Apart from HRM/HRV, optical Blood Pressure and SpO2 are also enabled by the two independent working photodiode inputs of the AS7057. The AS7057 is a size and performance optimized analog frontend to support space-limited applications such as in-ear vital sign monitoring.
The AS7057 provides three LED driver outputs, samples up to three photodiode inputs, and supports proximity detection integrated into one of the PPG signal channels. This enables high flexibility for several LED and photodiode arrangements in different applications. Furthermore, the AS7057 Biosignal Sensor Analog Frontend provides two ADC channels for simultaneous PPG measurements and an automatic photodiode offset control.
The AS7057’s low-power design and small form factor are particularly well-suited for application in earbuds, fitness bands, smartwatches, sports watches, and smart patches. In these cases, board space is limited, and users look for extended, multi-day intervals between battery recharges. A thin package dimension makes the AS7057 suitable for height-constrained solutions like earbuds.

Details

Features

  • 3 LED drivers and 3 photodiode input pins
  • Smallest wafer level chip scale package on the market
  • Two synchronized PPG acquisition channels
  • Two independent, programmable sequence blocks inside PPG signal acquisition
  • Several power reducing functionalities

Benefits

  • Flexible system design possible
  • Small size application possible, eg hearables
  • Enables optical blood pressure measurement
  • Enables proximity detection for additional energy savings
  • Prolonging the operating time

Parameters

Channels
input
3 detector
output
3
Supported algorithms
Heart rate
Heart rate variability
SpO2
Package
WLCSP
Package dimension
l
1.68 mm
w
1.68 mm
h
0.4 mm
Supply voltage
max.
1.98 V
Interface
input
I²C slave
output
I²C slave
Operating ambient temperature
min.
-30 °C
max.
85 °C
SNR
107 dB

Ordering codes

Product Type Description Order No. Availability
AS7057-BWLM Q65114A1332
AS7057A-BWLM With ams OSRAM Algorithm Q65114A2981
AS7057A-BWLT With ams OSRAM Algorithm Q65114A2985
AS7057-BWLT Q65114A1334

Downloads

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Datasheets

AS7057 DS001053

Short datasheet

User guides

Application note

Technical documents

Images