vt5376 STMicroelectronics, vt5376 Datasheet - Page 16

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

Laser
6.2
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Laser fault detection and safety feature
The sensor includes a set of self-diagnostics features at power-up. At power-up, it will
successively perform the following tests:
If any of the above conditions is not respected, the sensor will switch the LASER_OUT pad
off, and assert LASER_NEN pin high, disconnecting the VCSEL from its supply.
Measure Rbin, and check it’s not shorted to GND (>0.4 V)
Set LASER_OUT on (10 mA), and check LASER_OUT is not shorted to VDD (<1.2 V)
Set LASER_OUT to VDD via internal resistor, and check LASER_OUT is not shorted to
GND (>0.4V)
VT5376