A111 Pulsed Coherent Radar (PCR)

Datasheet, v2.8

Page 21 of 35

2022-06-22

© 2022 Copyright by Acconeer

After power up is complete, the sensor is loaded with a program. Up until the point where the sensor’s

program is started, the INTERRUPT is high impedance. However, after the sensor’s program has

started the INTERRUPT is configured to a push-pull CMOS output. It is therefore required that the

host I/O is configured as input before any programs are started on the sensor.

The power down sequence is described in Figure 8.5.

The power down sequence is initiated by setting “ENABLE” low. The crystal oscillator will be

disabled when ENABLE is set low.

After that, VIO_1-2a,b can be turned off. Time constant t3 (refer to Figure 8.5) later, VIO_3a,b can be

disabled. The constant t3 >=0. The I/O inputs on A111 (including CTRL if it is being used) must be set

to 0V before or simultaneously with VIO_3a,b going low, otherwise the internal ESD protection

diodes will draw current from the I/O source.

Time

VIO_3a,b

ENABLE

XIN

VIO_1-2a,b

t3

CTRL

Figure 8.5. The power down sequence.