VT5365

Customizable firmware

17/26

4.5

RF channels

The chip features a digital programmable frequency synthesizer using a 108 MHz clock as

an input, creating fractionally divided signals with frequencies around 27 MHz.

The different frequencies available are listed below:

●

F = 26.995 MHz,

●

F = 27.045 MHz, (default)

●

F = 27.095 MHz,

●

F = 27.145 MHz,

●

F = 27.195 MHz,

●

F = 27.245 MHz

The ST firmware enables all the frequencies, with the default (at power up) being

27.045 MHz. Depending on particular requirements, the customer can choose to have up to

all six frequencies available, selecting their own default channel.

Note:

As the output is digital, it will feature some unwanted frequency components, that will

require additional filtering circuitry to remove.

4.6

CPI

The customer can choose their own default CPI, although increasing the CPI will decrease

the maximum speed (due to the RF protocol). For example:

●

400 CPI : max. speed = 32 ips

●

800 CPI : max. speed = 16 ips

●

1600 CPI : max. speed = 8 ips

●

3200 CPI : max. speed = 4 ips

4.7

Motion sensitivity tuning

The motion engine has the ability to force no motion detection, if the features reported to it

are less than the minimum feature threshold. As at this point the mouse is either on a very

low contrast surface or is raised, the motion detection is stopped as noise could create false

wake-ups.

Depending on the typical surfaces to be used, the customer can decide on the threshold

value to enable the best balance between the mouse working on low contrast surfaces and

being able to go into it’s non-run (idle/sleep) modes.