17

Figure 16. Frame Capture Burst Mode

frame capture

NCS

address

data

address

address

MOSI

SCLK

P1

P2

P484

MISO

>120ns

2 reg write to enter

frame capture mode

pixel dump reg read

exit burst mode

enter burst

mode

Wait for 2

frames

μs

soonest to begin

again

μs

μs

Figure 15. SROM Download Burst Mode

NCS

address key data

address

byte 1

MOSI

SCLK

SROM_Enable reg write

SROM_Load reg

exit burst mod

enter burst

mode

5

μs

μs

5

μs

byte 2

byte 3070

0

μs

>120ns

μs

address

Soonest to read

SROM_ID

0

μs

SROM_Enable reg write

frame

period

SROM Download

This function is used to load the Avago supplied firmware

file contents into the sensor after sensor power up se-

quence. The firmware file is an ASCII text file.

SROM download procedure:

PixArt Imaging Inc.

Track-on-Glass Laser 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.

This function is used to load the PixArt supplied firmware file contents into the sensor after sensor power up

sequence. The firmware file is an ASCII text file.

SROM download procedure:

1. Write 0x05 to Power_Up_Reset register

2. Wait for at least 50 ms.

3. Write 0x1d to SROM_Enable register for initializing

4. Wait for 10 ms.

5. Write 0x18 to SROM_Enable register again to start SROM download

6. Write SROM file into SROM_Load_Burst register, 1st data must be download before SROM starts running.