Program introduction:
The oximeter is a portable non-invasive finger-type device for measuring the SaO2 value of human arterial blood oxygen saturation. The principle is that by sequentially driving a red LED (660nm) and a red LED (940nm), when the hemoglobin does not carry oxygen molecules, the absorption of 660nm red light is relatively strong, while the absorption length of 940nm red light is relatively weak . The red blood cells with oxygen molecules in hemoglobin have relatively weak absorption of 660nm red light and relatively strong absorption of 940nm red light. In blood oxygen measurement, the difference between reduced hemoglobin and oxyhemoglobin by detecting the light absorption of different wavelengths, the measured data difference is the most basic data for measuring blood oxygen saturation, and then calculated by algorithm Human blood oxygen data is displayed on the display.
1. Function introduction of the oximeter solution
The oximeter solution uses the SIC8833 chip, the package model is QFN32, and the peripheral auxiliary execution circuit is developed and designed through the single-chip microcomputer program. Finally, the oximeter can realize the following functions:
(1) One-key operation, immediately display the test result
(2) Automatic launch, automatic shutdown without fingers
(3) Data storage, automatically store data after measurement and produce data table records
(4) TFT/LCD display, the measurement results are clearly visible
2. Introduction of the SIC8833 chip for the oximeter solution
SIC8833 is an 8-bit RISC MCU with 24-bit ADC, built-in 8k×16-bit OTP program memory.
High-performance RISC CPU:
8-bit MCU
Built-in 8k×16-bit program memory OTP
488 bytes data memory (SRAM)
Only 43 word instructions
8-level storage stack
Five instruction cycles are optional
2MHz/1MHz/500KHz/250KHZ/125KHz, the default is 500kHz.
wai design features:
24-bit bidirectional I/O port
1 way buzzer, PT2.7 or PT2.3 output can be selected
6 internal interrupts (ADC, UART, TIMER0,
TIMER2, RTC, LVD), 2 external interrupts
5 input ports with wake-up function
4×16 LCD, 7×8 LED
1-channel input fully differential 24bit Sigma-Delta ADC
Built-in 1/2/4/8/16/32/64/128/256 times PGA
Built-in temperature sensor
Low Voltage Detect (LVD) Pin
1 way UART
built-in comparator
Low Power Features:
MCU working current
—Normal mode 1.5mA 16MHz (operating voltage 3V,
instruction cycle 500kHz)
— Less than 1.5µA current in sleep mode
Package:
QFN32
Performance parameters:
Industry Category : Security Monitoring
Delivery Form : PCBA
Performance parameter: Solution provider: Shenzhen
Application Scenario: Home