Atmel ATA6264 User Manual

Features
• Maximum Supply Voltage 40V
• One Programmable/Adjustable Boost Converter
• Two Programmable Buck Converters
• One Programmable Linear Regulator
• OTP Customer Mode
• 16-bit Serial Interface
• Two ISO9141 Interfaces (One Interface Programmable to LIN Functionality)
• Watchdog
• Various Diagnosis Functions
• 5 Voltage Sources Tailored to Resistor Measurement
• Charge Pump
• Small, 44-pin Package
• ESD Protection Against 2kV and 4kV
1. Description
With the introduction of the ATA6264, Atmel
®
introduces a new generation of airbag
power supplies for future airbag systems tailored to the needs of the automotive
industry. It is designed in Atmel’s 0.8 micron BCDMOS technology. ATA6264 contains
all the necessary blocks to supply the microcontroller, the firing capacitors, and
peripheral components of the airbag system. The power supply specifically fulfills the
power requirements of dual-voltage microcontrollers used in modern ECUs. The inte-
grated watchdog and diagnosis blocks additionally support the safety aspects. The
8-MHz 16-bit SPI enables a high communication speed. Despite the high-level func-
tionality, ATA6264 comes in a space-saving QFP44 package.
Airbag Power
Supply IC
ATA6264
Preliminary
4929B–AUTO–01/07

Atmel ATA6264 Specifications

General

Brand	Atmel
Model	ATA6264
Category	Accessories
Language	English

Summary

Description

Block Description

Integrated Buck Converter VSAT

Integrated Buck Converter VCORE

Linear Regulator VPERI

Pin Configuration

Pinning QFP44

Illustrates the pinout for the 44-pin QFP package with pin numbers and corresponding signal names.

Pin Description

Provides a detailed table mapping each pin symbol to its specific function and purpose.

Absolute Maximum Ratings

Stress Ratings and Device Reliability

Defines stress ratings beyond which permanent device damage may occur, impacting reliability.

Supply Currents

Initial Programming of the ATA6264

Describes the process of setting initial programming (IP) for output voltages and ISO9141 interface modes.

Start-up Procedure (5V/2.5V VCORE)

Power-down Procedure (Various Phases)

Start-up Procedure (1.88V VCORE)

Power-down Procedure (1.88V VCORE)

Power Supply Sequencing

Voltage Difference Monitoring

Charge Pump

Charge Pump Operation and Components

EVZ Step-up Regulator

Boost Converter Operation and Voltage Adjustment

Details the EVZ boost converter, its PWM switching, and voltage adjustment via external resistor divider.

VSAT Power Supply

Buck Converter Principle and Programming

Describes the VSAT buck converter, its feedback mechanisms, and voltage programming via serial interface.

VPERI Power Supply

Linear Regulator for Sensitive Components

Explains the VPERI linear regulator for precise voltage, high ripple rejection, and short-circuit protection.

VCORE Power Supply

Step-down Regulator with Feedback Control

Details the VCORE step-down regulator, its supply sources, and voltage programming options.

Reset Function (Pin RESQ and Pin RESQ2)

Digital Outputs for System Status

Explains RESQ and RESQ2 as low-active outputs indicating watchdog or voltage status to the system.

Watchdog Function

Microcontroller Function Verification

Details the integrated watchdog logic for verifying microcontroller function via serial interface commands.

LIN/ISO 9141 Interfaces

Dual Complete ISO 9141 Interfaces

Voltage/Current Sources (IASGx Sources)

Constant Voltage Sources for Resistance Measurement

AMUX (Analog Multiplexer for Voltage Measurements)

Measuring Voltages and Chip Temperature

Serial Interface Commands

Overview of Commands and Timing

Set Commands

Serial Interface Status Register

Test Mode

Enabling Test Mode for Testability

Describes the test mode activation via specific pins and serial commands for enhanced device testability.

Package Information

P-TQFP 44 Package Dimensions