ST default firmware

VT5365

14/26

3.9.1

Power management scheme

Figure 7.

Power management modes

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.

Note:

As described in Figure 7 above, the system will wake up if any GPIO activity occurs during

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.

RUN MODE:

System up and running (2 sub-modes):

- low frame rate (2.5 Kfps) for slow motion

- fast frame rate (10 Kfps) for fast motion

IDLE 1 MODE:

System wakes for 1 frame every

10 ms to check for motion

SLEEP MODE:

System wakes for 1 frame every

500 ms to check for motion

IDLE 2 MODE:

System wakes for 1 frame every

100 ms to check for motion

After 10 mins of

IDLE 2 mode

After 25 secs of

IDLE 1 mode

No motion and/or

GPIO activity for

200 ms

Motion detected and/or

GPIO activity