15

Notes on Shutdown and Forced Rest

The ADNS-3530 can be set in Rest mode through the

Configuration_Bits register (0x11). This is to allow for

further power savings in applications where the sensor

does not need to operate all the time.

The ADNS-3530 can be set in Shutdown mode by as-

serting the SHTDWN pin. For proper operation, SHTD-

widths may cause the chip to enter an undefined state.

In addition, the SPI port should not be accessed when

SHTDWN is asserted. (Other ICs on the same SPI bus can

be accessed, as long as the sensor’s NCS pin is not as-

serted.) The table below shows the state of various pins

during shutdown. After deasserting SHTDWN, a full reset

port, then write 0x5A to the POWER_UP_RESET register.

Any register settings must then be reloaded.

Pin

SHTDWN active

NCS

Functional*

MISO

Undefined

SCLK

Undefined

MOSI

Undefined

XY_LED

Low Current

MOTION

Undefined

*NCS pin must be held to 1 (high) if SPI bus is shared with other de-

vices. It can be in either state if the sensor is the only device in addition

to the microcontroller.

Note: There are long wakeup times from shutdown and forced Rest.

These features should not be used for power management during

normal mouse motion.

PixArt Imaging Inc.

Low Power LED Integrated Slim Mouse Sensor

All rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms without permission.

PixArt Imaging Inc.