VT5365_07 STMICROELECTRONICS [STMicroelectronics], VT5365_07 Datasheet - Page 16

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

Customizable firmware
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4.4
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Customizable firmware
The VT5365 features 4 kBytes of code space that is held in RAM. The RAM can be
uploaded at power-up from an external EEPROM (via the on-chip I2C master module) which
can be programmed with customer specific firmware. Please contact ST for more details.
The EEPROM must be connected to the SDA and SCL pins of the VT5365. The EEPROM
cannot be programmed by the VT5365 itself and must be pre-programmed before being
fitted to the final PCB. This sequence is only performed once at power-up, (for example,
when the batteries are replaced).
GPIO management
There are up to 9 GPIOs available for customization: GPIO 0 - 7 and SGPIO 1 (SGPIO 1 -
output only, if not being used as a DCDC controller output to supply VLED, see
SGPIO 1 -
SGPIO 0 is not available for customization as it is used as the Power Supply Select (see
Section 3.4: SGPIO 0 - power supply
Battery level monitoring
In the default firmware, the low battery level is set at 0.8 V with 200 mV hysteresis. This level
can be customized to be set from 0.6 V to 1.6 V in steps of 3.9 mV (1 V / 256).
Power mode time constants
The following power management time constants are also available for customization:
1.
2.
3.
4.
RF protocol
If required, the ST 27 MHz RF protocol can be replaced by the customer’s own protocol.
Please contact ST for more details.
The time before the mouse goes from one mode to the next i.e. from RUN to IDLE1 or
from IDLE 1 to IDLE 2. Minimum time between modes is 50 ms.
RUN mode frame rate, up to a maximum of 10 Kfps.
Speed at which the frame rate changes occur: low / medium / high frame rate.
IDLE and SLEEP times, for example increase or decrease IDLE 2 off time from 100 ms.
Minimum ‘off time’ = 10 ms.
VGate).
select).
Section 3.5:
VT5365