21

Power Up

The ADNS-9500 Sensor does not perform an internal

power up self-reset; the Power_Up_Reset register must

be written every time power is applied. The appropriate

sequence is as follows:

1. Apply power to VDD5/VDD3 and VDDIO in any order

2. Drive NCS high, and then low to reset the SPI port.

3. Write 0x5a to Power_Up_Reset register (address 0x3a).

4. Wait for at least 50ms time.

5. Read from registers 0x02, 0x03, 0x04, 0x05 and 0x06

(or read these same 5 bytes from burst motion register)

one time regardless of the motion pin state.

6. SROM download.

7. Enable laser by setting Forced_Disable bit (bit-0) of

LASER_CTRL0 register (address 0x20) to 0.

During power-up there will be a period of time after the

power supply is high but before any clocks are available.

The table below shows the state of the various pins during

power-up and reset.

State of Signal Pins After VDD is Valid

Pin

On Power-Up

NCS High before Reset

NCS Low before Reset

After Reset

NCS

Functional

Hi

Low

Functional

MISO

Undefined

Undefined

Functional

Depends on NCS

SCLK

Ignored

Ignored

Functional

Depends on NCS

MOSI

Ignored

Ignored

Functional

Depends on NCS

MOTION

Undefined

Undefined

Undefined

Functional

LASER_NEN

Undefined

Undefined

Undefined

Functional

Shutdown

The ADNS-9500 can be set in Shutdown mode by writing

0xb6 to register 0x3b. The SPI port should not be accessed

when Shutdown mode is asserted, except the power-up

command (writing 0x5a to register 0x3a). (Other ICs on

the same SPI bus can be accessed, as long as the sensor’s

NCS pin is not asserted.) The table below shows the state

of various pins during shutdown. To deassert Shutdown

mode:

1. Drive NCS high, then low to reset the SPI port.

2. Write 0x5a to Power_Up_Reset register (address 0x3a).

3. Wait for at least 50ms time.

4. Clear observation register.

5. Wait at least one frame and check observation register,

Bit[5:0] must be set.

6. Read from registers 0x02, 0x03, 0x04, 0x05 and 0x06

(or read these same 5 bytes from burst motion register)

one time regardless of the motion pin state.

7. SROM download.

8. Enable laser by setting Forced_Disable bit (bit-0) of

LASER_CTRL0 register to 0.

9. Any register setting must then be reloaded.

Pin

Status when Shutdown Mode

NCS

MISO

SCLK

MOSI

LASER_NEN

High (off )

MOTION

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

devices. It is recommended to hold to 1 (high) during Power Down

unless powering up the Sensor. It must be held to 0 (low) if the sensor

is to be re-powered up from shutdown (writing 0x5a to register

0x3a).

*2 Depends on last state. MISO should be configured to drive LOW

during shutdown to meet the low current consumption as specified

in the datasheet. This can be achieved by reading Inverse_Product_

ID register (address 0x3f ) since the return value (0xcc) on MISO line

ends in a 0 (low state).

*3 SCLK is ignored, if NCS is 1 (high). It is functional if NCS is 0 (low).

*4 MOSI is ignored, if NCS is 1 (high). If NCS is 0 (low), any command

present on the MOSI pin will be ignored except power-up command

(writing 0x5a to register 0x3a).

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.

ADNS-9500 Laser Gaming Sensor

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PixArt Imaging Inc.