STV-366-R01 STMICROELECTRONICS [STMicroelectronics], STV-366-R01 Datasheet - Page 8

• Manufacturer Part Number: STV-366-R01
• Description: 1.8V optical mouse sensor
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Design notes
3.4
Note:
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Driving the navigation LED
The VT5366 provides an output (TRK_LED) to drive the LED that is used to illuminate the
mousing surface. This output is active HIGH but cannot be used to drive the navigation LED
directly. An external NPN bipolar transistor is recommended as shown in the reference
schematic (
on the Reference Schematic).
The navigation LED, controlled by the VT5366, is used in a non-continuous mode. The duty
cycle of the LED is varied by the exposure controller inside the VT5366 and has a maximum
value of 40 % (on very dark surfaces).
Figure 6
). The maximum current through the LED is controlled by a resistor (R1
VT5366