Atmel ATA6286 User Manual

Atmel® offers highly integrated circuits for battery-powered sensor-gauge and base-station applications in

tire pressure monitoring systems (TPMS). The TPMS product portfolio includes a low-power Flash-micro-

controller RF-transmitter IC family to be used along with separate capacitive pressure or motion sensors,

plus a broad range of standalone RF-transmitter and LF-receiver ICs that can be combined with sepa-

rate microcontroller or smart sensor devices. These TPMS ICs are suitable for temperatures up to 125°C

(extended storage temperatures up to 175°C), and they provide outstanding low current consumption,

which helps the sensor gauges achieve 10-year longevity.

The TPMS portfolio also includes an innovative transparent RF receiver IC family with very fast switch-

ing times between RKE and TPMS signals. These ICs are capable of covering all physical functions

needed for combined TPMS/RKE systems. The polling mode and bit-check functions are carried out by

the fi rmware in a separate microcontroller device such as Atmel’s LIN multichip module ATA6612 with

integrated AVR

®

.

AUTOMOTIVE TPMS

ICs for Tire-pressure Monitoring Systems

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About TPMS

Pressure-on-Demand POD System Benefi ts

TPMS systems help to avoid accidents by warning
the driver about status of the tires. TPMS is a vehicle­embedded system, which detects the tire pressure by
analyzing the difference between the wheel speeds
(indirect method) or by measuring both temperature
and pressure (direct method).
The indirect method, in existence for over a decade, is
a very low cost method; however, it has many disad­vantages, in particular, that it is imprecise i.e., only one

tire defl ation is detectable, feasible only at 30 km/h.
Direct measuring systems, in contrast, precisely
monitor all four tires during parking and driving. The
detection of defl ated tires is possible within a short
learning time. The direct TPMS system consists of a
UHF receiver in the vehicle and four sensor gauges
mounted on the wheel rim/valve to sense data, cali­brate pressure versus temperature, and organize
data transmission to the car body.

A POD system includes a 125-kHz built-in chan­nel for waking up sensor modules in defi ned duty
cycles. Such systems remarkably increase the fl ex­ibility of wheel initialization when changing tires by
reprogramming the memory. POD systems also
enable autolocation functionality, i.e., they display the
precise location of a defl ated wheel. The driver can
toggle through different modes at the dashboard.

 Display Shows What Happened and Where
 Highest Flexibility During Wheel Change
 Several Measurement/Transmission Modes
 Adjustable Current Consumption
 Master/Slave System, i.e., the Sensor Communi-

cation is Controlled to Avoid Malfunction

 No Accelerometer in the Sensor Module

Necessary

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Ultra Low-Power Microcontroller Transmitter
ICs ATA6285/ATA6286 for Sensor Gauges

Transparent RF Receiver ICs ATA5745/ATA5746
for Combined RKE/TPMS Car Modules

Transmitter ICs ATA5756/ATA5757

LF Receiver IC ATA5283 LF Antenna Driver IC ATA5276

Highly Flexible RF Transmitter IC ATA5749
for Single Board Design

 Cutting Edge for Sleep Mode Current: 1.2 µA at

85ºC with Active Interval Timer

 ATA6285: 315 MHz, ATA6286: 433 MHz
 8 Kbytes In-system Self-programmable Flash

and 320 Bytes EEPROM

 Lowest Current Consumption (0.6 µA Sleep

Mode, 200 µA Measurement Mode)

 Integrates the Transmitter IC ATA5756/ATA5757

with a Dedicated 8-bit AVR Flash Microcontroller
Providing Capacitive Sensor Interface, LF Chan­nel, Temperature Sensor, and 90-kHz Slow-os­cillation Mode

 QFN32 Package (5 mm × 5 mm)

 ATA5745: 433 MHz, ATA5746: 315 MHz
 Extremely Fast Switching Rate Between RKE

and TPMS Signals: <1 ms (Typically)

 High System Sensitivity and Selectivity Can Be

Achieved Even with a Low Number of External
Components

 Polling Mode and Bit Check Carried Out by Exter-

nal Firmware

 ATA5756: 315 MHz (North America), ATA5757:

433 MHz (Europe) and 448 MHz (Korea)

 Settling Time <0.85 ms Typically and Reduced Ac-

tive Current Consumption for Extended Lifetime

 3-Wire Bus Interface

 World’s Smallest Standalone LF Receiver IC for

125ºC/257ºF Systems (TSSOP8 Package)

 Ultra Low Current Consumption (1.3 µA in Listen-

ing Mode with Sensitivity of 1 mV (Typically)

 Built-in Digital AGC to Amplify Input Signal from

the Coil

 1.5-A

PP

Antenna Driver for 125-kHz Operation

 Frequency Self-tuning to the LF Antenna Reso-

nance Frequency

 Built-in Diagnosis Function
 Operation Temp –40ºC/F to +105ºC/221ºF

 315/433 MHz Operation in ASK/FSK Modula-

tion with Single 13 MHz Crystal

 Fully Integrated Fractional –N PLL
 –0.5 dBm to 12.5 dBm Scalable Using Output

Power Programming

 Active Current Consumption 7.3 mA at 5.5 dBm

 RF Frequency Channelling
 Data Rate up to 40 Kb/s (Manchester)
 Very Fast Crystal Oscillation Start-up Time

(200 µm)

 Supply Voltage 1.9 to 3.6V
 TSSOP10

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products are not suitable for, and shall not be used in, automotive applications. Atmel’s products are not intended, authorized, or warranted for use as components in applications intended to support or sustain life.

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All rights reserved.

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of, AVR® and others are registered

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Rev.: 4616C-TPMS-04/08/02M

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Part Number

Frequency
Range [MHz]

Key Features Package

UHF Transmitter ICs

ATA5756
ATA5757

315
433

ASK/FSK UHF TPMS Transmitter ICs, From 2.0V TSSOP10

ATA5749 315/433 ASK/FSK UHF TPMS Transmitter IC, Fully Programmable by the

Microcontroller, Single-board Design for Both Frequencies with Single
13 MHz Crystal Type, From 1.9V

TSSOP10

UHF Receiver ICs

ATA5723 315 UHF Remote Control Receiver, 300 kHz Bandwidth RSSI

Pin Compatible to ATA5724, ATA5728

SSO20

ATA5724 433 UHF Remote Control Receiver, 300 kHz Bandwidth, RSSI

Pin Compatible to ATA5723, ATA5728

SSO20

ATA5728 868 UHF Remote Control Receiver, 600 kHz Bandwidth, RSSI

Pin Compatible to ATA5723, ATA5724

SSO20

ATA5745
ATA5746

433
315

Transparent UHF Receiver IC with Fast RKE/TPMS Switching Rate,
Suitable for 1 to 20 Kbits/s Manchester FSK with 4 Programmable
Bit-rate Ranges, High FSK Sensitivity (–114 dBm at 2.4 Kbits/s),
High Blocking Capability

QFN24

ATA5811
ATA5812

433
315

Fast Switching Rate between TPMS and RKE Receive Modes QFN48

LF Receiver ICs

ATA5283 125 kHz Industry-leading Ultra Low Power ASK Receiver IC with Minimum

Current Consumption and Maximum Sensitivity

TSSOP8

LF Antenna Driver ICs

ATA5276 125 kHz 1.5-APP Antenna Driver IC with Frequency Self-tuning to the LF

Antenna Resonance Frequency and Built-in Diagnosis Function

QFN20

Microcontroller Transmitter ICs

ATA6285
ATA6286

315
433

Single-package Microcontroller Transmitter Including 8-bit Flash AVR
Microcontroller with Capacitive Sensor Interface, 125-kHz Receiver
Channel, Temperature Sensor, 90-kHz Slow-oscillation Mode

QFN32

Microcontrollers

ATAM893 4 KB Flash-ROM/32 × 16-bit EEPROM SSO20

ATAR890 2 KB ROM/32 × 16-bit EEPROM SSO20

ATAR892 4 KB ROM/32 × 16-bit EEPROM SSO20

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TPMS System Status and Trends:
Battery-powered and Batteryless Systems

 Strong Trend Towards Low-cost TPMS Systems Forces Car

Manufacturers to Use Low-cost (Battery-powered) Sensor Gauges

 First Vehicle Platforms Equipped with Battery-powered Bi-directional

Channel LF/RF POD Systems (Autolocation Functionality, 100%
Confi dence Level of Pressure Monitoring)

 First Autolocation Platforms Evolve Based on Plausibility System Check Using

Double-axis Motion Sensors (Advanced Remote Systems)

 Further Trend Towards Higher Integration Level of Combined RKE/TPMS Modules
 Currently No Existing Platform with Batteryless Technology, Various Approaches

Still in Discussion