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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
Airbag Power Supply IC ATA6264 Preliminary
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 integrated watchdog and diagnosis blocks additionally support the safety aspects. The 8-MHz 16-bit SPI enables a high communication speed. Despite the high-level functionality, ATA6264 comes in a space-saving QFP44 package.
4929A–AUTO–10/06
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Figure 1-1.
Block Diagram
SVSAT VBATT VSAT
CP_OUT
SCLK
MOSI
MISO
SSQ
RESQ RESQ2 GNDD
K15
CP
Serial Interface Watchdog Reset
CP Logic
GKEYLogic
K30
GEVZ TxD1 RxD1 TxD2 RxD2 K1 K2 ISO9141 COMEVZO SVSAT COMSATO IASG1 IASG2 IASG3 IASG4 IASG5 ISENS SVPERI VPERIRegulator VPERI IASG VSAT VSATRegulator EVZ FBEVZ EVZRegulator OCEVZ GNDB
VEVZ
COMSATI
VVSAT
VVPERI
SVCORE UZP UZP AMUX VCORE
VVCORE
GNDA USP Internal Supply Reference VCORERegulator COMCOI
VINT
IREF
VBATT
2
ATA6264 [Preliminary]
4929A–AUTO–10/06
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USP
COMCOO
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ATA6264 [Preliminary]
1.1
1.1.1
Block Description
Integrated Boost Converter EVZ With an external n-channel FET, the integrated boost converter EVZ provides 3 different voltages adjustable via the serial interface for the energy reserve and firing capacitors. Two voltages are fixed values; one voltage can be adjusted using an external resistive divider. Integrated Buck Converter VSAT The integrated buck converter VSAT is a fully integrated step-down converter supplied by the boost converter, EVZ, and providing 7.8V, 9.1V, or 10.4V. The user can program the voltage via an OTP system. Integrated Buck Converter VCORE The integrated buck converter VCORE is a fully integrated step-down converter supplied either by the boost converter, EVZ, or by the battery, and providing 1.88V, 2.5V, or 5V. The user can program the voltage via an OTP system. Linear Regulator VPERI The linear regulator, VPERI, is supplied from the buck converter VSAT and provides an accurate voltage of 3.3V ±3% or 5V ±4% as a supply for sensitive elements such as sensors and ADC references with the current capability of 100 mA. The u.