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2.3.4.1 Analog Circuit
The SpO
2
module analog circuit adopts low power consumption design. The voltage of signal
amplifying part is ±2.5V. The first stage amplifying multiple is adjustable. The sensor's
driving voltage is 3.3V.
2.3.4.2 Digital Circuit
The digital circuit part mainly consists of microprocessor circuit and watchdog circuit.
The ADuC7024 microprocessor used on the SpO
2
module is AD’s 16/32-bit MCU. It has an
8kb SRAM and a 62kb Flash/EE memory, a 10-channel 12-bit ADC, a dual-channel 12-bit
DAC and a 12-bit data acquisition system. The processor kernel is ARM7TDMI which
supports 16/32-bit RISC command. The system frequency is up to 40MIPS. The ADuC7024
microprocessor supports downloading through UART and JTAG interfaces. The chip’s
operating voltage is 2.7 to 3.6V and operating temperature is -40 to 125℃.
The chip adopted in the watchdog circuit is TPS3823-30.
2.3.5 Charger stand
The DC terminal of the charger stand is a round male power plug which is used to connect
the pulse oximeter’s DC power supply connector. The AC terminal of the charger stand varies
to match AC power lines of different areas.
The charger stand meets the following specifications:
Input voltage 100 to 240V AC
Input frequency 50 to 60Hz
Output voltage 5V DC
Output current 1.2A
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