ADNS-3080 Avago Technologies US Inc., ADNS-3080 Datasheet - Page 19

• Manufacturer Part Number: ADNS-3080
• Description: Optical Mouse Sensor,DIP
• Manufacturer: Avago Technologies US Inc.

Specifications of ADNS-3080

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

SROM Download
This function is used to load the Avago Technologies-
supplied firmware file contents into the ADNS-3080. The
firmware file is an ASCII text file with each 2-character
byte (hexadecimal representation) on a single line.
This mode is activated by the following steps:
1. Perform hardware reset by toggling the RESET pin
2. Write 0x44 to register 0x20
3. Write 0x07 to register 0x23
4. Write 0x88 to register 0x24
5. Wait at least 1 frame period
6. Write 0x18 to register 0x14 (SROM_Enable register)
7. Begin burst mode write of data file to register 0x60
After the first data byte is complete, the SROM or micro-
controller must write subsequent bytes by presenting
the data on the MOSI line and driving SCLK at the normal
rate. A delay of at least t
Figure 23. SROM download burst mode
19
MOSI
SCLK
NCS
(SROM_Load register)
3 reg writes, see text
t
NCS-SCLK
>120ns
≥
period
1 frame
LOAD
SROM_Enable reg write
address
must exist between data
key data
≥
40μs
SROM_Load reg write
address
bytes as shown. After the download is complete, the
micro-controller must raise the NCS line for at least t
to terminate burst mode. The serial port is not available
for use until it is reset with NCS, even for a second burst
transmission.
Avago Technologies recommends reading the SROM_ID
register to verify that the download was successful. In
addition, a self-test may be executed, which performs a
CRC on the SROM contents and reports the results in a
register. The test is initiated by writing a particular value
to the SROM_Enable register; the result is placed in the
Data_Out register. See those register descriptions for
more details.
Avago Technologies provides the data file for download;
the file size is 1986 data bytes. The chip will ignore any
additional bytes written to the SROM_Load register after
the SROM file.
SROM file is now available for download at Avago Tech-
nologies’ website.
≥
t
LOAD
10μs
enter burst
mode
byte 0
t
≥
LOAD
soonest to read SROM_ID
10μs
byte 1
≥
byte 1985
10μs
exit burst mode
t
BEXIT
≥
4μs
address
≥
100μs
BEXIT