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AN3985 Datasheet(PDF) 11 Page - STMicroelectronics

Part # AN3985
Description  Using the CR95HF library with STM8L microcontrollers
PDF  105 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3985 Datasheet(HTML) 11 Page - STMicroelectronics

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AN3985
Overview
Doc ID 022255 Rev 2
11/105
3
Overview
3.1
CR95HF overview
The CR95HF is a Radio Frequency (RF) transceiver Integrated Circuit (IC) for 13.56 MHz
contactless tags, which includes ISO/IEC 14443, ISO/IEC 15693 and ISO/IEC 18092
protocols. It manages the RF communication with Radio Frequency Identification (RFID) or
Near Field Communication (NFC) tags. It includes frame coding, RF modulation and
contactless tag response decoding.
The CR95HF is a slave device and must be controlled by a host (Microcontroller Unit). This
library is an interface between user application function and standard peripheral driver.
The library was written in compliance with ANSI C standards.
Figure 1 describes a typical application block diagram.
Figure 1.
Typical application block diagram
For more details concerning the CR95HF, please refer to CR95HF datasheet.
3.2
Library overview
The library described in this application note is composed of three layers:
●
A low level layer supporting the commands described in the CR95HF datasheet. This
level is fully supported by the CR95HF library.
●
An intermediate layer based on ISO/IEC 15693 specification
●
A product layer supporting the commands described in the LRIxK and M24LRxx
datasheets
3.2.1
Example of an application architecture
The library can be downloaded from http://www.st.com.
Figure 2 shows the interaction between a typical user application and the CR95HF library
layers.
MS19958V1
ISO15693 RF
MCU
CR95HF
Contactless tag
CR95HF
library
ISO15693 RF
Memory products
Dual IC M24LR*
products
RF communication



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