Mindray DPM 1 Manual de servicio descargar pdf (Pagina 13)

Circuit Principle

2-1 Pulse oximeter Service Manual

Chapter 2 Circuit Principle

2.1 Overview

The DPM1 pulse oximeter collects SpO2 data from the sensor and sends to mainboard.

The maniboard processes the data and displays the results (SpO2 values) on the LCD

screen. Pulse-strength bar, battery remained capacity and data export indication are also

shown on the screen. DPM1 can be connected with PC through serial port for data

transportation and the data can be printed out from PC.

2.1.1 Hardware Theory

DPM1’s mainboard consists of power circuit, main logic circuit, display circuit and control

input circuit. The SpO2 value can be displayed on the LCD or be exported to PC through

serial port. The data also can be saved in the EEPROM on the main board as history

record. Watchdog circuit is used to reduce interference. Low-power design is adapted to

the main board in order to saving energy.

s1c133209

Power Monitor circuit

Keyboard Interface

LCD

PC Comunication port

Debug port

Switch Circuit

Infrade drive circuit

WDT data Memory

Flash

A/D Convert

Fig 2-1 DPM1 Pulse oximeter Block Diagram

2.1.1.1 CPU Power System

S1C33209 uses two voltages. VDD is used to supply the CPU and VDDE is the power

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Mindray DPM 1 Manual de servicio Pagina 13