Analysis of Portable Medical Equipment

At the same time, portable medical equipment can monitor vital signs before sending patients to the hospital, make the heart pacing again, and use ultrasound to check the internal situation of the body. Its goal is to contribute to the development of easy-to-use and interoperable home medical devices, and provide diagnostic data so that patients can obtain insurance compensation, etc

Let's analyze the mechanism and characteristics of portable medical devices, peel them layer by layer, and slowly "sting" our eyes

Block diagram of portable medical equipment:

Jn5148 - ultra low power consumption, high performance 32-bit MCU combined with IEEE802.15.4 compliant transceiver, supporting ZigBee & Jennet

For low-power wireless network applications, it has an enhanced 32-bit RISC processor to achieve high coding efficiency through variable width instructions; A multi-level instruction pipeline realizes low-power operation through programmable clock speed and various sleep modes. The device includes 128 KB ROM, 128 KB ram and various combinations of analog and digital peripherals. At the same time, the working current is less than 18 Ma, allowing it to work directly through the button battery... It is also extremely suitable for ZigBee Pro Network and intelligent metering

Advantages and features:

1. First class radio current consumption and a wide range of user peripherals

2. Adopt multi-functional 32-bit RISC CPU to realize high performance and low power consumption, and can run applications and ZigBee pro at the same time

3. The system BOM has few components, low cost and very low current, which can realize the solution of ultra long battery life

It can compensate for various changes, such as the change of humidity or pollution degree on the electrode. At the same time, it can detect the change of capacitance on the remote sensing board, so as to realize close operation without contact.

Pca8885ts - 8-channel capacitive touch and proximity sensor with automatic calibration and very low power consumption.

An 8-channel capacitive touch and proximity sensor detects capacitance changes on the remote sensing panel using the patented (edisen) method. The change of static capacitance is automatically compensated by continuous automatic calibration. The remote sensing panel can be connected to the IC through coaxial cable. 8 input channels work independently of each other. The sensors can also be arranged in a matrix through built-in options: interruption occurs only when two channels are activated at the same time, so as to prevent redundant channel output when both channels have been activated

Advantages and features:

1. Support matrix array sensor and remote connection of sensing plate

2. Adjustable response time and sensitivity (continuous automatic calibration, digital processing method, can be used with plexiglass with a maximum thickness of 6 mm)

3. Direct and latch switch mode, I C ultra fast mode (FM ) compatible interface

Pcf85063a - micro encapsulated real-time clock / calendar with alarm function and SPI bus

A CMOS real-time clock (RTC) and calendar, most suitable for low-power applications. The offset register allows fine adjustment of the clock. All addresses and data can be bi-directional I through two lines C bus serial transmission. The maximum data rate is 400 kbit / s. The register address will be automatically incremented after each write or read of data bytes... It is also suitable for various digital products and mobile devices

Advantages and features:

1. 400 kHz double line I Programmable clock output of C bus interface and peripheral devices

2. Alarm function, countdown timer, minute and half minute interrupt

3. Internal power on reset (POR), programmable offset register for frequency adjustment

Accurate and reliable, long-term stability, positive temperature coefficient and fault protection characteristics

PCT2075-I C bus FM , accuracy 1 , digital temperature sensor and temperature monitor

The accuracy is 1 C in the temperature range of 25 C to 100 C. Provide over temperature detection output and integrate a series of data registers: configuration register for memory device setting; A temperature register for storing digital temperature readings; Set point register for storing programmable over temperature shutdown and hysteresis limits and programmable temperature sensor sampling time tidle, which can be accessed through two-wire serial I The bus ultra fast mode (FM ) interface communicates with the controller

Advantages and features:

1. 1 MHz ultra fast mode (FM ) 30 Ma SDA driver can connect more devices on one bus, and is downward compatible with fast mode and standard mode

2. It has programmable temperature threshold and hysteresis set point during operation, and the power supply current is less than 1.0 in off mode A. It can save electric energy

3. When powered on, it can be used alone as a thermostat, an 11 bit ADC with a temperature resolution of 0.125 C

Pca6408a - low voltage, 8-bit I with interrupt output, reset and configuration registers C bus and SMBus I / O extender

Pass I C bus interface provides remote I / O expansion for most microcontroller series. When additional I / O is required while minimizing interconnection, NXP I / O expander provides a simple solution and has built-in level switching function, which makes these devices extremely flexible in a mixed signal environment where incompatible I / O voltages need to communicate

Advantages and features:

1. The latch output has a maximum driving capacity of 25 mA, which is used to directly drive the LED

2. Schmidt trigger operation allows slow input transition on SCL and SDA inputs and brings better switching noise immunity

3. When powered on, make all channels configured as input without pulse interference

Tfa9881uk - 3.4 w PDM input class D audio amplifier

Using 9 bumps WLCSP (wafer level chip package), with 400 M to receive audio and control settings through this interface. The dedicated silent mode is used to configure the control settings of the device, turn off the transition to the working mode, and trigger when the clock signal is detected... It is also extremely suitable for portable navigation devices, mobile phones and computers

Advantages and features:

1. The second-order closed-loop structure provides excellent audio performance and high supply voltage ripple suppression

2. It can completely prevent short circuit at both ends of the load and short circuit with the power line

3. Current limit that can avoid sound leakage, thermal protection function, undervoltage and overvoltage protection

2n7002bk - 60 V, 350 Ma n-channel trench MOSFET

N-channel enhanced field effect transistor (FET) is packaged with small SOT23 (to-236ab) surface mount device (SMD) with MOSFET technology. It has ESD protection up to 2 kV, compatible logic level and very fast switching. At the same time, it is especially suitable for: high-speed line driver and on-off circuit

Discrete semiconductor, DC / DC converter, LDOS

Ip3319cx6 - single channel common mode filter with integrated ESD protection network

Logic gate, data selector, GPIO, analog switch, LED controller, LCD driver, LED diode

Bza408b - Quadruple bidirectional ESD transient voltage suppressor

Today, many consumer medical devices simply display health monitoring results, leaving interpretation and recording to end users and their doctors. The new equipment can automatically record and transmit results through network connection.

At the same time, medical devices that help consumers have the following characteristics: simple and easy to use, highly reliable, safe, convenient connection, low power consumption (long battery life), support for a variety of voltages (especially low voltage), high measurement accuracy, small size, high cost performance

With so many advantages, so broad prospects and so practical performance, I believe no one can resist the naked Temptation

Do not forget the original heart, we can always... If you have thoughts, there will be repercussions