VT5365_07 STMICROELECTRONICS [STMicroelectronics], VT5365_07 Datasheet - Page 14

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

ST default firmware
3.9.1
Note:
14/26
Power management scheme
Figure 7.
The VT5365 has a four state power scheme - RUN, IDLE1, IDLE2, and SLEEP.
RUN mode is the mode where the whole system is up and running. This mode has three
submodes, dependant on the mouse velocity: 2.5 Kfps (for motion slower than 3 ips), 5 Kfps
(for motion between 3 and 6 ips) and 10 Kfps (for motion faster than 6 ips).
As long as there is some motion or any GPIO activity (e.g. Z-wheel, buttons) the mouse will
remain in this state.
After 50 ms of mouse inactivity, the mouse goes into the IDLE1 mode. In this mode the
system wakes up for 1 frame every 10 ms and checks for motion: if the mouse has not
moved, the system automatically goes back to its low power state, otherwise the system will
go into RUN mode.
As described in
the low power states. GPIO means - in this case - the CHANNEL_SYNC and the standard
GPIOs (e.g. buttons, Z-wheel).
After 25 seconds of IDLE1 mode, the system then goes into IDLE2 mode, where it wakes up
for 1 frame every 100 ms.
After 10 minutes of no activity, the system then falls into SLEEP mode, which is exactly the
same as the IDLE modes except that the system wakes up only every 500 ms to check
motion activity. As per the IDLE modes, any GPIO activity will send the system back to RUN
mode.
System wakes for 1 frame every
No motion and/or
GPIO activity for
200 ms
After 25 secs of
IDLE 1 mode
10 ms to check for motion
IDLE 1 MODE:
Power management modes
Figure 7
above, the system will wake up if any GPIO activity occurs during
System up and running (2 sub-modes):
- low frame rate (2.5 Kfps) for slow motion
- fast frame rate (10 Kfps) for fast motion
System wakes for 1 frame every
100 ms to check for motion
IDLE 2 MODE:
RUN MODE:
Motion detected and/or
GPIO activity
System wakes for 1 frame every
500 ms to check for motion
SLEEP MODE:
After 10 mins of
IDLE 2 mode
VT5365