ST M24LR-DISCOVERY Manual de usuario

13 February 2015 DocID023883 Rev 3 1/19

UM1589

User manual

M24LR-DISCOVERY kit user guide

Introduction

The M24LR-DISCOVERY kit helps you evaluate the M24LRXX-E Dual Interface EEPROM that features

an energy harvesting analog output, as well as a user-configurable digital output.

The M24LR-DISCOVERY kit is delivered with a battery-less M24LR board that can be powered by RFID

readers or NFC phones supporting the ISO/IEC15693 protocol. It is based on an M24LR04E-R I²C -

ISO/IEC15693 Dual Interface EEPROM, an 8-bit STM8L152C6T6 ultralow power microcontroller, and

includes an STTS751 temperature sensor, a 24-segment LCD, and 2 push buttons.

The M24LR-DISCOVERY kit also comes with an USB RF transceiver demonstration board that includes

the CR95HF 13.56-MHz multi-protocol contactless transceiver. It is based on a 32-bit, STM32F103CBT6

performance line microcontroller and is connected to a computer host via its USB connector.

Figure 1. M24LR evaluation board

Figure 2. RF transceiver demonstration board

Table 1. Applicable tools

Type Applicable tool

Evaluation tools M24LR-DISCOVERY

www.st.com

Contents UM1589

2/19 DocID023883 Rev 3

Contents

1 Quick start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.1 Getting started with the M24LR04E Dual Interface EEPROM . . . . . . . . . . 5

1.2 Using the M24LR board with Android NFC phones . . . . . . . . . . . . . . . . . . 6

1.3 System requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.4 Development toolchain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3 Hardware and layout description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.1 M24LR board description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.2 M24LR board power selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.3 RF transceiver board description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

3.4 RF transceiver demonstration board powering and startup . . . . . . . . . . . .11

3.5 Program/debug the M24LR board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

3.6 Program/debug the RF transceiver demo board . . . . . . . . . . . . . . . . . . . 12

4 Federal Communications Commission (FCC) and Industry Canada (IC)

Compliance Statements 13

4.1 FCC Compliance Statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.1.1 Part 15.19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.1.2 Part 15.105 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.1.3 Part 15.21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.2 IC Compliance Statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.3 IC Déclaration de conformité . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5 Electrical schematic diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

6 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

DocID023883 Rev 3 3/19

UM1589 List of tables

List of tables

Table 1. Applicable tools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Table 2. Available user modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Table 3. M24LR board programming and debug connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Table 4. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

List of figures UM1589

4/19 DocID023883 Rev 3

List of figures

Figure 1. M24LR evaluation board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Figure 2. RF transceiver demonstration board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Figure 3. M24LR board layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Figure 4. Jumper JP1 set in RF power position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Figure 5. Jumper JP1 in “REG_3V3” position and external power connection . . . . . . . . . . . . . . . . . . 9

Figure 6. External antenna connection with voltage regulator bypass. . . . . . . . . . . . . . . . . . . . . . . . 10

Figure 7. External antenna connection using M24LR board voltage regulator . . . . . . . . . . . . . . . . . 10

Figure 8. RF transceiver board layout (top and bottom) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Figure 9. M24LR board schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Figure 10. RF transceiver demonstration board schematics (STM32 connections) . . . . . . . . . . . . . . 16

Figure 11. RF transceiver demonstration board schematics (CR95HF connections) . . . . . . . . . . . . . 17

DocID023883 Rev 3 5/19

UM1589 Quick start

1 Quick start

The M24LR-DISCOVERY kit is a low-cost and ready-to-use development kit used to

evaluate the functions and performance of the M24LR Dual Interface EEPROM family and

its energy harvesting capability.

For more information on the M24LR-DISCOVERY kit and associated demonstration

software, please visit www.st.com/m24lr04e-discovery.

1.1 Getting started with the M24LR04E Dual Interface EEPROM

1. On the M24LR board, ensure that a jumper is placed on connector JP1 in the RF power

position (jumper on the right side as shown in Figure 4).

2. Download and install the M24LR/CR95 application software setup file [STSW-

M24LR011] available at www.st.com/m24lr04e-discovery.

3. Connect the RF transceiver demo board to a PC with a USB cable.

4. Launch setup.exe, and select CR95HF Demo Kit. Then, open the Demo NDEF

messages menu and select Show Demo NDEF & Energy Harvesting.

5. Place the M24LR board antenna close to the RF transceiver demo board antenna.

6. The M24LR board starts in Message Display mode (The “M24LR04E-DISCOVERY”

message scrolls across the screen from right to left).

You can read the current NDEF message stored in the M24LR04E-R by clicking the

Read NDEF message button of the PC software.

You can also write an new NDEF message: it will be automatically displayed on the

M24LR board LCD screen after programming.

7. To change the user mode, press push button B2 (blue button on the left side of the

board). Table 2 lists the user modes available.

To study or modify the M24LR board application project related to this demo, please visit

dedicated webpages on www.st.com/m24lr04e-discovery.

Table 2. Available user modes

Mode Description

1 Displays the NDEF text message stored in the M24LR04E Dual Interface EEPROM.

2 Displays the voltage powering the M24LR board.

3 Displays the ambient temperature, measured using the temperature sensor.

Quick start UM1589

6/19 DocID023883 Rev 3

1.2 Using the M24LR board with Android NFC phones

1. Enable NFC communication on your phone (Settings >Wireless and Networks>NFC).

2. Download the NfcV-Reader Application from Google Play Store.

3. Launch the NfcV-Reader application.

4. Place the phone's NFC antenna close to the M24LR board antenna.

The phone powers the M24LR board.

The text message can be changed in the M24LR04E using the NFC phone (select NDEF

function in the NfcV-Reader application and open the Write NDEF message menu).

Please note that performance may vary depending on the NFC phone and its RF

management system.

1.3 System requirements

•Windows®PC (XP or Vista)

•Two USB cables

1.4 Development toolchain

•Cosmic CXSTM8 compiler

•STMicroelectronics ST Visual Develop (STVD) integrated development environment

•STMicroelectronics STLINK/V2 in-circuit debugger and programmer

DocID023883 Rev 3 7/19

UM1589 Features

2 Features

The M24LR-DISCOVERY kit includes M24LR board and the RF transceiver board

which offer the following features.

M24LR board

•M24LR04E-R, a 4-Kbit EEPROM with an I²C-ISO/IEC 15693 dual interface and an

energy harvesting analog output (Vout pin) and a user-configurable digital output (RF

Write-in-progress or Busy pin) in an SO8N package

•9-turn, 13.56-MHz etched antenna (20mm x 40mm) for RF powering and

communication

•STM8L152C6T6, 8-bit ultralow power microcontroller with up to 32 Kbytes of Flash

memory, 2 Kbytes of RAM, and 1 Kbyte of Data EEPROM in a 48-pin LQFP package

•STTS751 I²C low power temperature sensor

•28-pin LCD on DIP24 socket (24 segments, 4 commons)

•Two push buttons (User and Reset)

•HC-49S-C20SSA, a 4-MHz crystal oscillator (not used in demonstration firmware)

•4-pin connector (CN1) for STM8L programming and debug (SWIM)

•2-pin connector (CN2) for external power supply source (3 to 6V)

•5-pin connector (CN3) for M24LR04E-R and I²C bus probing

•3-pin switch (JP1) to select M24LR board power source (M24LR04E Vout pin or

external)

RF transceiver board

•CR95HF, a 13.56-MHz multi-protocol contactless transceiver IC with SPI and UART

serial access communication

•2-turn, 13.56-MHz etched loop antenna (47mm x 34 mm) with associated tuning circuit

and lowpass filter

•STM32F103CBT6, a 32-bit microcontroller with 128 Kbytes of Flash memory and USB

interface in a 48-pin LQFP package

•KF33BDT, a 3.3V low dropout (LDO) voltage regulator

•USB connector

•NX2520SA, a 27.12-MHz EXS00A-CS01206 crystal oscillator for CR95HF transceiver

•HC-49XA-C20QQA-8.000MHz for STM32

•20-pin JTAG connector for STM32 programming and debugging

•1 push button (Reset)

Hardware and layout description UM1589

8/19 DocID023883 Rev 3

3 Hardware and layout description

3.1 M24LR board description

Figure 3. M24LR board layout

STM8L152C6T6

SWIM connector

M24LR04E-R

4-MHz crystal

M24LR04E-R

9-turn,

Reset button (B1)

M24LR board

External

LDO voltage

STTS751 I²C

temperature

sensor (U2)

regulator for

external power

input (U5)

power supply

connector (CN2)

power selection

connector (JP1)

13.56-MHz

etched loop

antenna

Dual interface

EEPROM (U4)

oscillator (X1)

and I²C

connector (CN3)

(CN1)

microcontroller (U1)

24-segment

LCD (U3)

User button (B2)

DocID023883 Rev 3 9/19

UM1589 Hardware and layout description

3.2 M24LR board power selection

When jumper JP1 is set in the “RF power” position (Figure 4), the M24LR board is powered

by the M24LR04E-R energy harvesting analog output (Vout pin). In this configuration, the

M24LR board is powered by the magnetic field flowing into its 9-turn, etched loop antenna,

delivered from a 13.56-MHz RF source, such as an RFID reader or an NFC phone. The DC

voltage supply delivered by the M24LR04E-R Vout pin is filtered by an 10-nF capacitor

(C19) and stored in the 150-µF capacitor (C22). The low dropout (LDO) voltage regulator

(U5) is bypassed, so the M24LR04E-R voltage is filtered but not regulated.

Figure 4. Jumper JP1 set in RF power position

When jumperJP1 is set in the “REG 3.3" position (Figure 5), the M24LR board is powered

by the external power supply connected on connector CN2. The voltage applied on the

external power supply connector CN2 is regulated by the 3.3V voltage regulator (U5). The

external power supply voltage can be from 3.3 to 6V.

Using an external power supply is necessary when programming or debugging the STM8L

MCU using the SWIM connector (CN1).

Figure 5. Jumper JP1 in “REG_3V3” position and external power connection

It is also possible to connect an external antenna demonstration board featuring the energy

harvesting function (ANTX-M24LRXXE) to improve or simply evaluate the energy

harvesting function using a different antenna.

Hardware and layout description UM1589

10/19 DocID023883 Rev 3

Figure 6 and Figure 7 illustrate the use of an external antenna using the ANT1-M24LR16E

demonstration board.

•Figure 6 shows a possible direct connection of the Vout voltage coming from the ANT1-

M24LR16E antenna demo board on jumper JP1 to bypass the voltage regulator (U5).

•Figure 7 shows the connection of the Vout voltage coming from the ANT1-M24LR16E

antenna demo board on connector CN2 to use the voltage regulator (U5). Jumper JP1

must be set as shown in Figure 5.

Figure 6. External antenna connection with voltage regulator bypass

Figure 7. External antenna connection using M24LR board voltage regulator

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