Read Panasonic KX-DT301X Service Manual online
6
KX-DT301X / KX-DT301X-B
4.2.
Circuit Operations
4.2.1.
Reset and Power Supply Circuit
Function:
Voltage regulator (IC4) makes 3.3V from VBUS (+5V) of USB bus, and supplies it to USB controller(IC3), photo-couplers (IC5,
IC6, IC12) and isolators(IC7), reset IC(IC14).
IC14 the reset signal to IC3.
IC6, IC12) and isolators(IC7), reset IC(IC14).
IC14 the reset signal to IC3.
Circuit Operation:
Connection of USB cable inputs VBUS (+5V) into the pin 1 of IC4.
IC4 outputs 3.3V into its pin 5 and supplies 3.3V to IC3 and IC5- IC7 and IC12, IC14.
If IC14 acts as the monitor of 3.3V by the pin 2 and becomes less than 3.0V, it will input a reset signal into the pin 16 of IC1.
IC4 outputs 3.3V into its pin 5 and supplies 3.3V to IC3 and IC5- IC7 and IC12, IC14.
If IC14 acts as the monitor of 3.3V by the pin 2 and becomes less than 3.0V, it will input a reset signal into the pin 16 of IC1.
4.2.2.
USB Interface Circuit
Function:
USB controller (IC3) is controlled by MPU (IC1) and performs USB communication.
Circuit Operation:
IC3 controls USB signal D+ and D-, and communicates with PC.
IC3 is controlled by four signals (CS, SK, SI, SO) from IC1, and transmits and receives a command and data.
IC3 is controlled by four signals (CS, SK, SI, SO) from IC1, and transmits and receives a command and data.
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