VT5365_07 STMICROELECTRONICS [STMicroelectronics], VT5365_07 Datasheet - Page 13

• Manufacturer Part Number: VT5365_07
• Description: Single chip optical/laser mouse sensor for wireless applications
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

VT5365
3.5
3.6
3.7
3.8
3.9
Note:
SGPIO 1 - VGate
If required, (that is, if VLED > 1.8 V) SGPIO 1 can be used as a DCDC Controller output to
supply VLED. For more details please refer to STV-365-R0X user manuals.
CPI swap
The default CPI 'Counts Per Inch' of the VT5365 is 800 CPI. This can easily be toggled
between 800/1600 CPI by the user, by simply holding down the left and right buttons for 2
seconds. Once the CPI has changed, GPIO 0 will go low and turn on the Low Battery LED.
The LED turns off again as soon as one of the buttons is released.
If the batteries are removed from the mouse it will return to the default (800 CPI).
ST protocol
ST has designed their own 27 MHz RF protocol for wireless mouse applications. The coded
scheme used is the Manchester method, baud rate = 4.8 kbps.
There is support for 5 buttons, Z-wheel, 254 channel IDs + checksum.
RF ID - external EEPROM
The RF identification is stored in and read from an external EEPROM. If there is no
EEPROM fitted, then every time the mouse is powered off the user will have to reconnect
the mouse/receiver on power up.
Power management
The VT5365 is self contained, controlling everything on chip, including power management
and automatic sleep or wake-up.
The VT5365 includes several features that enable the user to choose the implementation to
maximize battery life. Typically, the MCU has the power to shut the complete chip down (with
the exception of the digital regulator, the POR and the on-chip low frequency timer). In this
mode all the clocks are OFF and the chip can wake up in two ways:
1.
2.
The user can program which GPIO has the ability to wake up, or not to wake up, the system.
Upon completion of a timer cycle (period is programmable and is set prior to going to
sleep).
Upon reception of an external event, such as a state change on one of the eight main
GPIOs.
ST default firmware
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