F9 Fetal & maternal Monitor Service Manual Principle Introduction
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EMS Memory
SDRAM: 64M byte
Flash: program 8M bytes + data 64M bytes
Serial Port Configure in 5 serial ports and 9 serial ports way
Headphone Interface Loudspeaker output
Touch Screen Interface 1 interface.
USB
1 standard USB HOST interface, 1 standard DEVICE interface (1.1
specification)
VGA 1 VGA output port, standard VGA outputting
LCD 1 TFT LCD interface, 1024*768 (highest resolution)
Keyboard 1 PS/2 keyboard interface
GPIO At least 10
Watchdog Timer 1.6s
Power Consumption 700mA @ +5V (max)
Size 142 mm×105 mm
Operating System Linux
7.2.2 Fetal Monitor Module
The main function of the fetal monitor module is to detect FHR, AFM and TOCO, a new function
of collecting and playing back audio signals is added. Refer figure 7-3 for its system structure
block diagram, power, simulating front circuit, ADC, audio processing circuit and digital circuit
are included. Signal detecting is divided into three branches: two fetal hearts and fetal movements
detecting and a TOCO (pressure on the pregnant woman’s abdomen) detecting.
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