A111 Pulsed Coherent Radar (PCR)

Datasheet, v2.8

Page 17 of 35

2022-06-22

© 2022 Copyright by Acconeer

8

Functional Description

The below figure shows the A111 system integration with Host MCU:

Host MCU

A111

Sensor

XTAL

ENABLE x1

SPI x4

INTERRUPT x1

1.8V single power supply

CLK ref. 24MHz

CTRL x1 (optional)

Figure 8.1. System integration.

The Acconeer software is executed on Host MCU that handles sensor initiation, configuration, sweep

acquisition and signal processing.

The Serial Peripheral Interface (SPI) is a 4-wire serial bus, used for configuration and reading output

from the A111 radar sensor. The A111 radar sensor is an SPI slave device, connected to the SPI

master (Host MCU), and allows several devices to be connected on same SPI bus, with a dedicated

slave-select signal. Daisy-chain is not supported.

The sensor provides support for ENABLE and INTERRUPT as interrupt signal, always output, that is

used as an interrupt in the Host MCU. The sensor supports an optional control signal: CTRL, which is

configured through software, e.g. for controlling the operating state of the sensor to idle in Hibernate.