14

One-Time-Programmable (OTP) Memory

The on chip OTP memory allows device configuration flex-

ibility to override the default setting of sensors without

any external software driver. Once the OTP operation

is enabled, all OTP registers must be programmed

accordingly as the default values of un-program OTP

registers are always zero when L1_USE_OTP register

setting is not zero value. Tips: OTP write to the OTP register

can be skipped if the setting is zero value (0x00) in order

to save the OTP programming time.

OTP address space is from 0xDF to 0xE8. OTP can be pro-

grammed via USB interface using Set Vendor Test and Get

Vendor Test commands.

Figure 16. OTP Byte Write Flow Chart

Yes

Yes

Yes

No

No

No

No

0x51: REGA_OTP_CONFIG[0]=1

0x52: REGA_OTP_ADDR[7:0]

0x53: REGA_OTP_DATA[7:0]

0x54: REGA_OTP_CTRL[0]=1

0x54: REGA_OTP_CTRL[0]

0x58: REGA_OTP_CTRLSTAT[0]

bit = 0?

bit = 1?

more

bytes?

Done

Read OTP program bit

read otp status bit

OTP write pass

repeat = 1

Write OTP address byte

Write OTP data byte

Write OTP program bit

Start

Write OTP enable bit

repeat = repeat + 1

repeat = 10?

OTP write fail

Bad Chip

OTP Byte Write Operation

OTP write operation flow chart is shown in Figure 16.

1. Set OTP Clock enable bit in OTP_CLOCK register, 0x42:

OTP_CLOCK_EN = 1.

2. Set OTP enable bit in OTP_CONFIG register, 0x51: OTP_

EN = 1.

3. Write the OTP register address byte to OTP_ADDR

register, 0x52.

4. Write the OTP data byte to OTP_DATA register, 0x53.

5. Set write enable bit in OTP_CTRL register, 0x54 to

enable write command to OTP: WR = 1.

6. Read the write enable bit status in OTP_CTRL register,

0x54. If WR = 1, repeat reading the bit status until it is

clear.

7. Read the write status bit in OTP_CTRLSTAT register,

0x58.

a. If WR_OK = 1, OTP write operation is completed.

Repeat Step 2 for more OTP byte write operations.

b. If WR_OK = 0, repeat Step 4.

8. If Step 6b is repeated up to 10 times, OTP write operation

is failed and the chip is confirmed as defective unit.

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.

PixArt Imaging Inc.

ADNS-2710 Single Chip USB Optical Mouse Sensor