VT5376 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'VT5376' PDF : 24 Pages View PDF
General features
7
General features
VT5376
7.1
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. Excluding the capacitor accuracy, the
frequency will be accurate within 10% range.
Figure 9. VT5376 RC_OSC signal
166 ns (6 MHz) typ.
RC_OSC
500mV
typ.
1V
typ.
GND
7.2
7.3
Note:
7.4
Battery level monitoring
The device includes an 8-bit ADC that translates the VBAT voltage into an 8-bit value that
can be read using I2C. The external MCU can upload this value and take any action
required.
Resolution setting (counts/inch)
Due to an accurate on-chip interpolation process, the device operates below the pixel
resolution. This enables the user to easily select any desired resolution with 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.
RESET_OUT pin
This pin can be used in a system where the VT5376 generates the overall application power
supply, including the MCU (for example, a wireless mouse with VBat supplied by a 1 x AA
battery, see Section 3.3 on page 8).
RESET_OUT goes high once the VT5376 supply (that is, internal regulators and DCDC) is
up and running. In automatic power management mode (see Section 1.2 on page 4), the
RESET_OUT pin can be used to tell the MCU to come out of reset. Alternatively, it could be
replaced by a simple wait routine in the MCU firmware, before any I2C commands are
written to the VT5376.
20/31
Doc ID 13939 Rev 4
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