ADNS-7700 Datasheet, PDF (18/60 Pages) AVAGO TECHNOLOGIES LIMITED – One chip USB LaserStream Mouse Sensors Single 5.0 volts power supply

OTP Byte Read Operation
OTP read operation flow chart is shown in Figure 17.
1. Set OTP enable bit in OTP_CONFIG register, 0x4C:
OTP_EN = 1.
2. Write the OTP register address byte to OTP_ADDR
register, 0x4D.
3. Set read enable bit in OTP_CTRL register, 0x4F to enable
write command to OTP: RD = 1.
4. Read the read enable bit status in OTP_CTRL register,
0x4F. If RD = 1, repeat reading the bit status until it is
clear.
5. Read the OTP data byte from OTP_DATA register, 0x4E
to complete the OTP read operation.
6. Repeat Step 2 for more OTP read operations.
0x4F: OTP_CTRL [1] = 1
0x4F: OTP_CTRL [1]
0x4E: OTP_DATA [7:0]
Start
Write OTP enable bit
Write OTP addr byte
Write OTP read bit
Read OTP read bit
No
bit = 0?
Yes
Yes
Read OTP data
OTP read done
0x4C: OTP_CONFIG [0] = 1
0x4D: OTP_ADDR [7:0]
Figure 17. OTP Byte Read Flow Chart
More bytes?
No
Done
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