Advertisement
2.2
CIRCUIT DESCRIPTION (KCH-20R)
2.2.1 Overview
KCH-20R is a remote control panel with 2.75" LCD and extended keys. KCH-20R has built-in Bluetooth and micro SD card slot. The
Bluetooth supports HSP. KCH-20R has two circuit units. XC3-010 is Sub unit and XC3-011 is Interface unit. There consist of a power
supply circuit, audio circuit, control circuit and the Bluetooth circuit.
2.2.2 Power supply circuit
SB is provided from Mobile Deck (NX-5700 or NX-5800) when Mobile DECK turns on. SB is connected to modular jack , IC1 and IC2.
IC1 regulates SB voltage to 5.36V(53DC) and IC2 regulates SB voltage to 3.9V(39DC). Both ICs operate whenever SB is supplied.
53DC is the power supply for Class-D Audio Amplifier, CAN transceiver, IC8(50D) and each LED.
39DC is the power supply for all DC/DC and regulators except for IC1(53DC), IC2(39DC).
A1 regulates 39DC to 1.2V(12D) and 12D provides the power to MPU core.
IC5 outputs 1.8V(18D) while 12D is operating. 18D provides the power to MPU I/O, DDR, Codec DSP and enables each regula-
tor(IC3, IC4, IC6). 18D_Flash is the power supply for Flash memory. After 33D turns on, IC10(switch IC) operates and 18D_Flash
starts working.
IC8 regulates 5.36V(53DC) to 5.0V(50D) and provides the power to Level shift circuit and Audio circuit. 50D is enabled while 18D is
operating.
IC3, IC4 and IC6 is provided 3.9V(39DC) and while 18D is operating, each IC outputs 3.0V(30LCD), 3.3V(33A) and 3.3V(33D).
30LCD is the power for LCD module. 33A is the power for Audio circuit and Codec analog section. 33D is the power for MPU I/O,
Codec I/O, CAN transceiver and Flash memory.
IC9 regulates 3.9V(39DC) to 3.3V(33SD). 33SD is the power for SD Circuit. When SD Card is used, MPU outputs 33SDC High signal
and IC9 starts working.
Power supply diagram is described Fig. 1.
1-6 (No.RA027<Rev.001>)
Hide quick links:
Advertisement
