STV-366-R01 STMICROELECTRONICS [STMicroelectronics], STV-366-R01 Datasheet - Page 16

• Manufacturer Part Number: STV-366-R01
• Description: 1.8V optical mouse sensor
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Operation
5.3
5.4
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Initialization
It is recommended that the VT5366 autoclear function is activated during a read. To do this
the processor should write the value 0x02 to register 0x20 after enabling the VT5366 (by
setting PowerDown LOW). This only needs to be done once after the power supply has
been applied.
Reading the X any Y motion vectors
It is recommended that the processor reads the motion data at a rate of around every 2ms.
The X and Y motion information is read using a single I2C ‘multiple read’ transaction. The
sequence is as follows;
(1) Read I2C registers 0x21 (contains X-motion) and 0x22 (contains Y-motion).
Note that these two registers MUST be read with a single I2C ‘multiple read’ transaction.
See
As shown above X and Y motion vectors can be read from registers 0x21 and 0x22. The
values are in 2’s complement notation to allow positive and negative motion to be
represented. The values read represent the accumulated motion since the last time the
registers were read. As soon as the registers have been read they will automatically be reset
to 0 and the Motion Detect output (pin 24) will go LOW.
Chapter 6
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VT5366