ADBS-A320 Datasheet, PDF (41/55 Pages) AVAGO TECHNOLOGIES LIMITED – Optical Finger Navigation

Self_Test
Access: Write
Address: 0x10
Reset Value: 0x00
Bit
7
6
5
4
3
2
1
0
Field
Reserved Reserved Reserved Reserved Reserved Reserved Reserved TESTEN
Data Type: Bit field
USAGE: Set the TESTEN bit in register 0x10 to start the system self-test. The test takes 250ms. During this time, do not
write or read through the SPI port. Results are available in the CRC0-3 registers. After self-test, reset the chip to
start normal operation.
The procedure to start self test is as follows:-
1. Write 0x5a to register 0x3a to initiate soft reset. Do not load OFN registers.
2. Write data 0xF6 to register 0x60.
3. Write data 0xAA to register 0x73.
4. Write data 0xC4 to register 0x63.
5. Write 0x01 to register 0x10 to initiate self test.
6. Wait 250ms.
7. Read from CRC0 from address 0x0c, CRC1 from address 0x0d, CRC2 from address 0x0e, CRC3 from address
0x0f.
The results are as follows.
CRC#
CRC0
CRC1
CRC2
CRC3
Orient = 1
0x36
0x72
0x7F
0xD6
Orient = 0
0x33
0x8E
0x24
0x6C
Field Name
TESTEN
Description
Enable System Self Test
0 = Disable
1 = Enable
Configuration_bits
Access: Read/Write
Address: 0x11
Reset Value: 0x00
Bit
7
6
5
4
3
2
1
0
Field
RES
Reserved Reserved Reserved Reserved Reserved Reserved Reserved
Data Type: Bit field
USAGE: Register 0x11 allows the user to change the configuration of the sensor. The RES bit allows selection between
500 and 1000 cpi resolution.
Field Name
RES
Description
Sets resolution
0 = 500
1 = 1000
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