Usb Support; Power Sensor - Philips 221P3LPYES/00 Service Manual

112 Meridian 3
3.18.8 Monitor Audio Amplifier Input Impedance
The monitor audio amplifier shall have minimum 10K ohm AC input impedance.
3.19 USB HUB 2.0 Support
Connect the HUB port of the monitor to host PC's USB port via USB cable, then attach external device to the
downstream port of the monitor. Check if the device can work properly.

3.20 Power Sensor

Functional Requirement for the front detection
For the presence sensor functionality, the following requirements are defined.
Two IRs be used for user present detections, one IR is for transmission signals, the other one is for receiving
reflection IR signals.
User must be detected in the following range: 0 up to 100cm (+20 cm)
Detection angle: +/- 30 degree
Sensor key control: adjust detection distance (0~4 scales), default is 3
0: off, 1: 55 cm, 2: 70 cm, 3: 85 cm, 4: 100cm
Anti-interference between two monitors, monitors must have anti-interference methods (coding...etc) to
prevent monitors to talk to each other.
Power Sensor Functional Behavior
Time Period
Power Sensor
Power Saving
The following setup will be supported:
60sec 60sec ~ 180sec
Lower down backlight
No ACTION
brightness
0 50%
Monitors standing back to back
180sec ~
Backlight & LCD panel
shutdown
80%