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IC4 controls KEY, LED.
A reset signal from the VoIP(IC1) starts either reset or normal operating.(L:RESET)
The SUB-CPU and VoIP are connected by a serial communication.

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The key data is under the matrix control by IC4.
The key information outputted from KEYOUT is inputted into KEYIN, when the key is pressed.
The HOOK key is independent from Key Scan Matrix and taken into the port singularly.

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KEY INPUT CONTROL TIMING CHART

The lighting of the LED is controlled by IC4.
The LED lights up in a dynamic lighting system.
The duty ratio is 1/8(ON time 1.5ms).

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LED DYNAMIC LIGHTING

This Power Supply Circuit supports the power supply through an Ethernet line called PoE(Power over Ethernet) as well as the
input from a regular AC adapter.

 

The power supply is as follows;