Atmel ATAK5276-83 Istruzioni per l'installazione e il funzionamento

LF Wake-up Demonstrator ATAK5276-83

1. General Description

ATAK5276-83 is intended to demonstrate the performance of an LF wake-up channel

needed for battery-driven systems. Typical wake-up applications can be found in

vehicles for Tire Pressure Monitoring (TPM).

The demonstrator hardware (HW) consists of the LF transmitter board (ATAB5276)

patched onto a microcontroller base board and an LF receiver board (ATAB5283).

The high antenna driver ability of the transmitter, combined with the sensitive receiver,

enables a wake-up distance of up to 2.5 meters.

For the general functionality of the ATA5276 and the ATA5283 please refer to the

related datasheets.

2. System Configuration

Figure 2-1. LF Wake-up Demonstration System

ATAK5276-83

LF Wake-up

Demonstrator

ApplicationNote

4857C–AUTO–07/06

ATAK5276-83

2.1 Components Included

• ATAB5276 demonstrator board patched onto a microcontroller base board

• ATAB5283 receiver board, inclusive Li battery (optionally, the ATAB5282 receiver board)

• Antenna module

• Serial RS232 interface cable

• Two cables for DC power supply

• CD-ROM installation software and documentation

2.2 Equipment Needed

• Host PC with Windows®95 or higher

• Power supply 8V to 24V DC 2A (alternative 8V to 24V DC 1A with capacitor 2000 µF/20V at

output)

3. Host Software Controlling the ATAB5276 Transmitter Board

Host software is needed to control the transmitter board via the microcontroller on the base

board. The software is installed by executing a self-extracting setup file contained on the

included CD-ROM (see Section 5. ”Demonstrator: Getting Started” on page 11).

Upon execution of the demonstration software, the setup menu is displayed (see Figure 3-1 on

page 3). Clicking send causes serial data patterns to be sent via the DIO line to the transmitter.

Depending on the mode selection, patterns can be sent in single-operation or loop-operation

mode. Pattern data to be sent can either be loaded by clicking on load pattern, or by directly edit-

ing the table. The index box to the left of the table shows the index number of the OFF/ON timing

step located in the top row of the table. A maximum of 100 OFF/ON timing steps can be speci-

fied and saved to the AVR®microcontroller. Specially composed patterns may be saved into a

new data file.

To demonstrate ATA5276 with ATA5283, an appropriate data file ATA5283.dat is loaded by

default. That file includes the preamble protocol for waking up the receiver; followed by modula-

tion data, switching on the LED indicator on the receiver board. With the continuous carrier

mode selection, the field can be switched on steadily (this feature is useful for antenna evalua-

tion or field strength measurements).

4857C–AUTO–07/06

ATAK5276-83

Figure 3-1. Command Settings on the Host Screen

4. Hardware Components

4.1 Transmitter Board ATAB5276_V1 with External Antenna Module

Figure 4-1. Transmitter Board ATAB5276_V1

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ATAK5276-83

Figure 4-2. Antenna Module

The transmitter board (see Figure 4-1 on page 3) is patched onto a microcontroller base board

communicating with a host PC. Operation software must be installed on the host via the

enclosed CD-ROM. A power source of typically 12V/2A is used to supply the microcontroller

base board and the transmitter board in parallel with separate connectors as seen in Figure 2-1

on page 1. The antenna driver frequency is tracked according to the resonant condition of the

antenna in use. An external antenna module (see Figure 4-2 on page 4) is used, with the high

voltage capacitor and resistor matching the resonant frequency and Q-factor. The capacitor

CANT (C1) is used to match the resonant frequency to fres = 125 kHz ±3 kHz, and the resistor

RANT (R1) sets the Q-factor to about 25. With the default module adjustment, a current flow of

around 0.6 Ap at VBATT = 12V can be achieved. Therefore, jumper J3 has to be closed

(RCR =R

CR1//RCR2 =25kΩ). If Jumper J3 is open (RCR =R

CR1 = 100 kΩ) the current set point is

decreased leading to a regulation level of typically 0.37 Ap.

To reach the maximum antenna current (1.5 Ap), the series resistor RANT (R1) on the antenna

module has to be shorted and the current regulation set point has to be set to maximum

RCR =R

CR1//RCR2 = 25 (J3 closed).

Optionally, RANT and CANT can be placed on the board if a customized pure antenna coil will

be used. Then, Jumpers J1 and J2 have to be opened.

Note: The power dissipation of shunt resistor RSEN and module resistor RANT must be considered if a

high antenna current in continuous operation mode will be programmed.

4.2 Typical Parameters of Antenna Module

Coil Inductance: L125 = 345 [µH] ±5%

Coil Resistance: R125 = 2.5 [Ω]

Impedance: Z125 = 271 [Ω]

Module Series Resistor: RANT (R1) = 10 [Ω]

Series Capacitor: 4.7 nF/1400V

Total Q-Factor: Q125 = 22

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ATAK5276-83

Figure 4-3. Schematic of the Transmitter Board ATAB5276_V1

Duty

Cycle

Regu-

lator

VCO

Reg.

Refer-

ence

State

Machine

K-

Line

Gate Driver Control

Half Bridge

Driver

BOOST

DVCC3

VCC

DIO

VDIO

DVSS2

DVSS3

DVSS1

SENSE

VSS

DRV3

DRV2

DRV1

DVCC1

DVCC2

TM3

RCR

REXT

TM2

TM1

Ref.

ext.

BUS

Current

Sense

OFF

CLK

DRV

X3_1

X3_2

VBATT

8 ... 24V

GND

X4_1

X4_2

C5 C4

RSEN

RANT REXT

RCR1

X2_5

X1_11

DRV

LD1

RCR2

X1_7

VCC

DIO

DVCC

DRV

IANT

DRV

CANT

(C1)

RANT

(R1)

LANT

Ext. Antenna Module

CANT

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ATAK5276-83

Table 4-1. Parts List of the Transmitter Board ATAB5276_V1

Part No. Designation Value Type Manufacturer

U1 Transmitter IC - ATA5276 Atmel®

T1 NPN transistor Standard BC847 -

D3 Schottky diode 50V/1.1A/(40V/1.1A)

5.5A SL04 for example, Vishay®

D2 Schottky diode 30V/0.2A BAT42W for example, Vishay

D1 LED Red TLMT3100 for example, Vishay

R1 Resistor 47 kΩSMD 0805 for example, Vishay

R2 Resistor 100 kΩSMD 0805 for example, Vishay

R3 Resistor 10 kΩSMD 0805 for example, Vishay

R4 Resistor 1.8 kΩSMD 0805 for example, Vishay

REXT Resistor 100 kΩSMD 0805 for example, Vishay

RCR1 Resistor 100 kΩSMD 0805 for example, Vishay

RCR2 Resistor 33 kΩSMD 0805 for example, Vishay

RSEN Resistor 0.56Ω/1W SMD2512 for example, Vishay

RANT Resistor Optional n.c. -

C1 Capacitor Electrolytic 120 µF/50V EEUFC1H121 Panasonic®

C2 Capacitor Ceramic 100 nF SMD 0805 Standard

C3 Tantalum 10 µF/10V SMD -

C4 Capacitor Ceramic 100 nF SMD 0805 Standard

C5 Capacitor Ceramic 1 nF SMD 0805 Standard

CANT Capacitor Optional n.c. -

DIO, IANT,

DRV1, TP1 PCB test terminal Yellow - -

GND PCB test terminal Black - -

DVCC, VCC PCB test terminal Red - -

X1–X2 Connector 18 pin - - -

X3 Antenna plug - PN 175781-1 Tyco Electronics®

X4 Power plug (2.1 mm) - Cliff Electronics®

J1-J3 Header 2 pole - - -

(J1-J3) Jumper 2.54 mm - -

PCB Board ATAB5276 V1.0/1.5 mm - Atmel

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ATAK5276-83

4.3 Receiver Board ATAB5283

The receiver IC ATA5283 is equipped with a 1D LF antenna on-board.

Received data is indicated by an LED display. Once data is received, the IC can be returned to

STANDBY mode by pressing the RESET button. Test pins allow the measurement of all relevant

signals. A 3V lithium battery is used, supplying the receiver with LED indication.

Figure 4-4. Receiver Board ATAB5283_V3

Figure 4-5. Schematic of Receiver Board ATAB5283_V3

L1 C1

Lith

LF Receiver

NDATA

NWAKE

C14

C15

LED red

GND

Reset

NWAKEUP

RESET

VDD

COIL1

VSS

TST1

NDATA

TSSOP8

ATA5283

NWAKE

GND

RESET

NDATA

654

321

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ATAK5276-83

4.4 Receiver Board ATAB5282

An LF wake-up demonstration can alternatively be performed with the 3D receiver ATA5282.

Due to the header detection, the Q-factor of the antenna module has to be reduced to Q < 20

(for example, RANT = 15).

The board is equipped with a 3D LF antenna. It offers the possibility of an optional assembly by

separate antenna coils for x, y, and z field detection. Additionally, an LED is used to indicate the

received data protocol. Test points and a pin socket allow the measurement of all relevant sig-

nals. A 3V lithium battery is used, supplying the receiver with LED indication.

Table 4-2. Parts List of Receiver Board ATAB5283_V3

Part No. Designation Value Type Manufacturer

U1 Wake-up IC - ATA5283 Atmel

T1 Transistor PNP BC857 -

T2 Transistor NPN BC847 -

D1 LED Red TLMT3100 Vishay

L1 Antenna coil 7.2 mH/Q = 28 SDTR1103-0720 Predan

C1 Capacitor 220 pF ±5%/50V SMD Ceramic for example, Vishay

C1b Capacitor Optional - for example, Vishay

C14 Capacitor 100 nF ±10%/50V SMD Ceramic for example, Vishay

C15 Capacitor 10 µF/10V Tantalum for example, Vishay

R1 Resistor Optional - -

R2 Resistor 100 kΩStandard -

R3 Resistor 100ΩStandard -

R4 Resistor 47 kΩStandard- -

R5 Resistor 100 kΩStandard- -

R6 Resistor 100ΩStandard- -

R7 Resistor 10 kΩStandard- -

R8 Resistor 100 kΩStandard- -

Vbatt1 Battery holder - - -

Li-Cell - 3V/220 mAh CR2032 -

S1 Push button - - ITT-Cannon®

6 pcs Test pins - - -

4857C–AUTO–07/06

ATAK5276-83

Figure 4-6. Receiver Board ATAB5282_V4

Figure 4-7. Schematic of Receiver Board ATAB5282_V4

Lith

NWAKE

LD1

GND

R4/1+ R4/2

NWAKE/

DATA

VDD

COIL1

VSS

NSCL

TSSOP8

ATA5282

C2b

C1b

C3b

COIL2

COIL3 NSCL

COIL3

COIL2

COIL1

C2a

C1a

C3a

NWAKE

GND

NSCL

654

321

4857C–AUTO–07/06

ATAK5276-83

Table 4-3. Parts List of the Receiver Board ATAB5282_V4

Part No. Designation Value Type Manufacturer

U1 Wake-up IC - ATA5282 Atmel

T1 Transistor PNP BC857 -

LD1 LED Red TLMT3100 Vishay

L1-L3 3D Antenna Coil 4.77 mH/5.89 mH/Q = 37/35 3DC1515S-0477X Predan

C1 Capacitor 330 pF ±5%/50V SMD Ceramic for example, Vishay

C2 Capacitor 330 pF ±5%/50V SMD Ceramic for example, Vishay

C3 Capacitor 270 pF ±5%/50V SMD Ceramic for example, Vishay

C4 Capacitor 1 µF/10V Tantalum for example, Vishay

C6 Capacitor 10 µF/10V Tantalum for example, Vishay

R1 Resistor 180 kΩSMD 0805 -

R2 Resistor 180 kΩSMD 0805 -

R3 Resistor 390 kΩSMD 0805 -

R4/1 Resistor 1 MΩSMD 0805 -

R4/2 Resistor 1 MΩSMD 0805 -

R5 Resistor 47 kΩSMD 0805 -

R6 Resistor 100 kΩSMD 0805 -

R7 Resistor 100ΩSMD 0805 -

R8 Resistor 100ΩSMD 0805 -

R9 Bridge 10 kΩSMD 0805 -

Vbatt1 Battery holder - - -

Li-Cell - 3V/ 220 mAh CR2032 -

7 pcs Test Pins - - -

1 pcs Test Socket 2 x 3 pole - -

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