AS7056

General description

Short Datasheet

• PUBLIC • Document Feedback

DS001052

• v5-00 • 2024-Sep-12

3 / 13

/

AS7056 Biosignal converting unit

1

General description

The AS7056 Biosignal Sensor Analog Frontend (AFE) is the next generation Vital Sign Sensor

in the ams OSRAM product family. 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 AS7056. The AS7056 is a size and performances optimized Analog Frontend to

support space-limited applications such as in-ear vital sign monitoring as well as ring

applications.

The AS7056 provides two LEDs and one VCSEL 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 AS7056 Biosignal Sensor Analog Frontend provides

two ADC channels for simultaneous PPG measurements and an automatic photodiode offset

control.

The AS7056

’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 AS7056 suitable for height-

constrained solutions like earbuds.

1.1

Key benefits & features

The benefits and features of AS7056, Biosignal converting unit are listed below:

Table 1: Added value of using AS7056

Benefits

Features

Flexible LED/photodiode configuration.

2 LED + 1 VCSEL driver and 3 photodiode input pins.

Allows smallest application size, e.g. in-ear vital sign

monitoring

Small Wafer-Level-Chip-Scale-Package (WLCSP).

Enables optical blood pressure measurements.

Two synchronized PPG acquisition channels.