VT5365_07 STMICROELECTRONICS [STMicroelectronics], VT5365_07 Datasheet - Page 11

• Manufacturer Part Number: VT5365_07
• Description: Single chip optical/laser mouse sensor for wireless applications
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

VT5365
2.7
Note:
Driving the navigation LED
The VT5365 provides an output (NAV_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
resistor (R9 on the reference schematic).
The navigation LED is used in a non-continuous mode. The duty cycle of the LED is varied
by the exposure controller inside the VT5365 and has a maximum value of 40% (on very
dark surfaces).
(Figure 4 on page
8). The maximum current through the LED is controlled by a
Design notes
11/26