Handset Circuit; Outline; Power Supply System; Cpu - Raymarine RAY230E Owner's Handbook Manual

Technical Description

4.2 Handset Circuit

4.2 4.2 Handset Circuit Handset Circuit Handset Circuit
4.2 4.2 Handset Circuit

4.2.1 Outline

4.2.1 Outline
4.2.1 Outline 4.2.1 Outline 4.2.1 Outline
The handset is connected to the cradle to communicate control data for
various functions, such as transmission/reception of voice signals on the
handset, all key operations, LCD display, lighting by LED, monitor control
of the cradle, etc.
4.2.2 Circuit Makeup 4.2.2 Circuit Makeup
4.2.2 Circuit Makeup 4.2.2 Circuit Makeup 4.2.2 Circuit Makeup
The circuit consists of the following components:
• Power supply system circuit
Digital system +5V Voltage Regulator (IC701)
Analog system +5V Voltage Regulator (IC702)
Analog system +9V Voltage Regulator (IC714)
• Single Chip CPU (IC706)
• LCD Display Controller/Driver (IC709)
• LED Driver Circuit (IC710)
• Electronically-controlled Volume (IC716)

4.2.3 Power Supply System

4.2.3 Power Supply System 4.2.3 Power Supply System
4.2.3 Power Supply System 4.2.3 Power Supply System
The input voltage of the main supply power is +13.6V. The internal operation
voltages for the respective applications are as follows:
• +9V by the voltage regulator (IC714) for LCD lighting
• +5V by the voltage regulator (D5V, IC701) for a digital voltage
• +5V by the voltage regulator (A5V, IC702) for an analog voltage
• +5V (VTH) from emitter follower (Q703) for working bias voltage for the
voice signals

4.2.4 CPU

4.2.4 CPU 4.2.4 CPU
4.2.4 CPU 4.2.4 CPU
The CPU is an 8-bit, single-chip microcomputer µPD789026 (IC706).
4.2.5 Controller Driver for LCD display 4.2.5 Controller Driver for LCD display 4.2.5 Controller Driver for LCD display
4.2.5 Controller Driver for LCD display 4.2.5 Controller Driver for LCD display
The PCF2113DH/F4 (IC709) is a LCD controller driver used to indicate
alphanumeric characters and symbols.

4.2.6 LED Driver Circuit

4.2.6 LED Driver Circuit
4.2.6 LED Driver Circuit 4.2.6 LED Driver Circuit 4.2.6 LED Driver Circuit
The TB62715 FN (IC710) makes a 4-stage dimming control for the LEDs
(D704–D707) and the LCD backlight, and also turns on/off the keypad
LEDs (D708–D720).
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