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SR-MU921B Function Description

1. RFID fundamentals

Radio Frequency Identification (RFID) is a wireless

communication technology. It can identify the object under test

through radio signals, and the system does not need to contact

with the object under test.

By inductively coupled electromagnetic fields, radio signals

transmit information from electronic tags placed on the object

under test, thereby automatically identifying it. The tag, which

can be identified within a few meters, contains electronically

stored information. Unlike bar codes, RFID tags do not have to

be seen from the human eye, but can be identified from the

object being identified.

SR-MU921B Overview

General Description

：

SR-MU921B is a high performance UHF RFID Reader

Module, which is designed with lower dissipation, high

integrated RFID chip design, cost effective and small size. It can

be widely applied in many RFID application systems such as

logistics, access control, attendance system, anti-counterfeit

and industrial production process control system etc.

Summary of content (9 pages)

PAGE 1
SR-MU921B Function Description 1. RFID fundamentals Radio Frequency Identification (RFID) is a wireless communication technology. It can identify the object under test through radio signals, and the system does not need to contact with the object under test. By inductively coupled electromagnetic fields, radio signals transmit information from electronic tags placed on the object under test, thereby automatically identifying it.
PAGE 2
Features： *Designed based on low dissipation (single +5V power supply) and high integration RF transceiver chip * Support EU 866~868MHz, US 902~928MHz working frequency (or Customized). *Support EPC global UHF class 1 gen2 / ISO18000-6C protocol RFID tags. *Support temperature sensor RFID tag, moisture Sensor RFID tag and some other sensor RFID tags.
PAGE 3
. SR-MU921B principle description SR-MU921B is a high performance UHF RFID Reader Module, which is designed base on a high integrated RFID Reader chip, with low cost effective and small size. It meets EPC Gen2/ISO18000-6C tag protocol which is an international RFID standard. The follow diagram shows the principle of the SR-MU921B.
PAGE 4
serial port, the other is General Purpose Input/Output port (GPIO). For the UART serial port, the reader module receives control commands from the host through the UART serial port; at the same time, it return back the data of the electronic tag that read by the reader module to host and so on. For the GPIO port, the host control the reader module power up or power down, also reset the reader module by the GPIO port.
PAGE 5
 MCU unit MCU unit base on a High-performant Cortex-M3 microcontroller, which run some software module to support the function of Reader Module, including Communication process, Tag protocol flow process, Tag receive data process, RF power control and Antenna control and so on. Communication process are communication with two side unit, one is communication with Host outside of Reader Module, and the other is communication with the Reader Chip unit.
PAGE 6
LNA, PLL circuit, embedded MCU circuit and UART port. The RFID Reader Chip is in charge of generating the based Tag instruction that was modulated into a Transmit Path unit and demodulate the tag response data from these electronic tags. MCU unit send a tag operation command to the embedded MCU of Reader Chip, then the modulation circuit and PLL of Reader Chip generate the RF Tag instruction for the Transmit Path unit to send a RF modulate wave to an electronic tag.
PAGE 7
 Receive Path unit Receive Path unit receive the response RF signal from electronic tag. There are receive filter, impedance transformer circuit and so on.  Coupler unit The main function of couplers unit is to separate RF signals between transmit and receive signal. On the one hand, it pass the transmit RF signal to RF Antenna unit, on the other hand, it pass the receive RF signal to Receive Path unit.
PAGE 8
FCC Statement This device complies with part 15 of the FCC rules. Operation is subject to the following two conditions: (1) thi s device may not cause harmful interference, and (2) this device must accept any interference received, incl uding interference that may cause undesired operation. Changes or modifications not expressly approved by the party responsible for compliance could void the user’ s authority to operate the equipment.
PAGE 9
Integration instructions for host product manufacturers according to KDB 996369 D03 OEM Manual v01 2.2 List of applicable FCC rules CFR 47 FCC PART 15 SUBPART C has been investigated. It is applicable to the modular transmitter 2.3 Specific operational use conditions This module is stand-alone modular.