WPAN technology based and JN512 chip wireless medical monitoring system design (1)

1 preamble

Wireless medical care is the use of wireless communication technology aided medical monitoring of abbreviation.

Wireless medical care is the use of wireless communication technology aided medical monitoring of abbreviation. In recent years, with the miniaturization of bio-medical sensors, information processing and wireless data transmission technology for rapid development and popularization, makes wireless medical monitoring become hot.

Zigbee is a year to the rise of the wireless network communication technology standards, low cost, low power consumption is the highlight of their advantages.

Its network capacity, data exchange, focusing on low-rate signal wear transmission. Fully compatible with the basic physiological signal transmission requirements.

This article introduces the key WPAN-based medical monitoring of wireless technology, and then describes JN5121 chip based technologies, as well as test validation.

Finally on wireless medical monitoring network of the prospects and issues do exist.

2 based on WPAN technology wireless medical monitoring

WPAN is a small area of the device to establish a wireless connection and the development of wireless transmission technology, the IEEE Standards Association have developed IEEE802.15.x standards. This article deals with the transmission technology designed for low speed of IEEE802.15.4 WPAN (Zigbee) standards.

Figure 1 wireless medical monitoring system chart

The paper presents a framework that is based on the WPAN, distinguished from the wireless remote medical care.

This article concerns focused on physiological signal acquisition to physiological signal transfer section of wirelessly. Wireless medical monitoring method is used primarily by sensor nodes, wireless data transfer modules, and accept the node. Accept the node can access the control center, or Ethernet, wireless wide area networks, and other ways to access the control center, constitute the complete medical monitoring network. In this framework, the medical sensor nodes can be configured according to specific conditions, which constitute local or family of wireless medical monitoring network, this framework has great flexibility and extensibility. In this framework, our wireless communication method to Zigbee Protocol as the basis for adopting JN5121 module as a wireless transceiver node. Figure l describes wireless medical monitoring system map.

3 JN5121 chip based sensor design

3.1 JN5121 module introduction

JN5121 is Jennic company launched by a IEEE802.15.4 compatible low-power, low cost wireless micro-controller.

The module built-in 32-bit RISC processor, configured with 2.4GHz band EEE802.15.4 standard wireless transceivers, 64 KB RAM, ROM.96kB wireless sensor network application provides a wide range of solutions, colleagues highly integrated design simplifies the overall system cost, JN5121 built-in ROM memory integrates point-to-point communication and mesh network communications complete protocol stack, and its built-in RAM memory, can support the network routing and controller functionality without requiring external extensions any storage space, built-in hardware MAC address and highly secure AES encryption Accelerator, reduces the power consumption of the system and processor load. It also supports Crystal energy saving hibernation and system engineering. At the same time, provides for a large number of analog and digital peripherals interop support you can easily connect to a user's external application systems.

3.2 sensor node design

Wireless physiological sensors has two parts: the physiological signal acquisition and transmission parts.

Physiological signal acquisition, we can take what we need a variety of physiological ECG electrodes on the human body, the blood concentration of breeding saturation, pulse, and more-volume measurement. Wireless modules we use set the microprocessor and RF chip integrates JN5121 S0C chip, chip can control the entire node handling operations, routing protocols, synchronous positioning, power management and task management. Use the chip relative to past Zigbee RF chip, no valid external MCU, save-on-chip peripheral circuits with on-chip solutions can further conserve some volume, easy to carry a person under guardianship. Figure 2 is a physiological wireless sensor solutions.

Figure 2 physiological wireless sensor solution