vt5376 STMicroelectronics, vt5376 Datasheet - Page 17

• Manufacturer Part Number: vt5376
• Description: Ultra-low Power Laser Motion Sensor For Laser Mouse Applications
• Manufacturer: STMicroelectronics

VT5376
7
7.1
7.2
7.3
Note:
7.4
7.5
General features
Device clocking
The device integrates its own oscillator. It does not require an external Xtal or resonator,
instead it requires only an external capacitor of 33 pF. The accuracy of this cap will
determine the accuracy of the internal clock. Ignoring the capacitor accuracy, the frequency
will be accurate within10 % range.
Battery level monitoring
The device includes an 8-bit ADC that translates the VBAT voltage into an 8-bit value that
can be read via I2C. The external MCU can upload this value and take any action required.
Resolution setting (counts/inch)
Due to accurate an on-chip interpolation process, the device operates below the pixel
resolution. This enables the user to easily select any desired resolution via a simple register
write.
Different resolutions can be applied to X and Y, this could be useful in case of optical non-
symmetry or distortion.
Image monitoring
It is possible to capture an image and download it via simple I2C write/read sequence. This
is useful to calibrate optics during development or to perform basic tests.
Optical centre
The optical centre of the VT5376 is NOT in the centre of the package, it is offset by -
0.243 mm in the X-axis and 0.215 mm in the Y axis with respect to the centre of the
package as shown in
out the PCB.
Figure 10
. The PCB designer must take this into account when laying
General features
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