Atmel ATA6264 24. Application Circuits

77

4929B–AUTO–01/07

ATA6264 [Preliminary]

24. Application Circuits

Figure 24-1. Overview of a Typical Airbag System

COMSATO

SVSAT

COMEVZ

FBEVZ

VPERIFB

VPERI

VSAT

COMSATI

EVZ

GNDB

OCEVZ

GEVZ

K30

K15

K15 K1

CP-OUTCP

K2 RESQ2

UZP

RxD2

IASG1 to 5USP IREF

TxD2

RxD1

RESQ

GNDD

ISENS

GNDA

TxD1

COMCOO

Serial

interface

Sensor Safety-

system

monitoring

D, L, C

net

Firing ASIC

Enable

Enable

Firing loops

Micro-

controller

COMCOI

VCORE

SVCORE

K1K30 K2 IASG1 to 5

Contents

Main Features 1. Description Airbag Power Supply IC ATA6264 Preliminary ATA6264 [Preliminary] Figure 1-1. Block Diagram V VSAT V 1.1 Block Description ATA6264 [Preliminary] 2. Pin Configuration Figure 2-1. Pinning QFP44 Table 2-1. Pin Description ATA6264 [Preliminary] 3. Absolute Maximum Ratings 3. Absolute Maximum Ratings (Continued) 4. Functional Range 4.1 Protection Against Substrate Currents 5. Supply Currents 5.1 Discharger Circuit 5.2 Initial Programming of the ATA6264 Page Page 4929BAUTO01/07 5.3 Start-up and Power-down Procedure V V V V Page Page Page 6. Power Supply Sequencing Figure 6-2. Block Diagram Power Supply Sequencing V V V VCORE - Regulator V 7. Charge Pump VEVZ = 5.5V to 40V or VK30 = 5.5V to 40V, VK15 > 3V, VVINT = 3.7V to 5.47V VVSAT, VVPERI and VVCORE are within functional range limits, Tj = 40C to 150C Table 7-1. Electrical Characteristics Charge Pump 8. GKEY Function Figure 8-2. Application With High Current Switch (GKEY Function Not Used) VK15 = 3V to 40V, VK30 = 3.85V to 40V VEVZ, VSAT, VPERI and VCORE are within functional range limits, Tj = 40C to 150C Table 8-2. Electrical Characteristics GKEY Function 9. EVZ Step-up Regulator Page ATA6264 [Preliminary] VK15 = 3V to 40V, VK30 = 5V to 40V, CGEVZ = 200 pF to 2 nF, VINT = 3.7V to 5.47V VSAT, VPERI and VCORE are within functional range limits, Tj = 40C to 150C Table 9-1. Electrical Characteristics EVZ Step-up Regulator Table 9-1. Electrical Characteristics (Continued) EVZ Step-up Regulator Table 9-1. Electrical Characteristics (Continued)EVZ Step-up Regulator 10. VSAT Power Supply VEVZ = 5.5V to 40V, VCP > VEVZ + 7V, VINT = 3.7V to 5.45V VK30, VPERI and VCORE are within functional range limits, Tj = 40C to +150C Table 10-1. Electrical Characteristics VSAT Power Supply Table 10-1. Electrical Characteristics (Continued) VSAT Power Supply 11. VPERI Power Supply VSAT > 7.5V, VINT = 3.7V to 5.47V, VCORE < VPERI + 0.3V VK30, VEVZ and VCORE are within functional range limits, Tj = 40C to 150C Table 11-1. Electrical Characteristics VPERI Power Supply 12. VCORE Power Supply VEVZ = 5.5V to 40V or VK30 = 5.5V to 40V, VCP > VEVZ + 7V or VCP > VK30 + 7V, VPERI >V VSAT is within functional range limits, Tj = 40C to 150C Table 12-1. Electrical Characteristics VCORE Power Supply Page Table 12-1. Electrical Characteristics (Continued) VCORE Power Supply 13. USP Comparator for General Purpose 14. Reference Voltage and Reference Current Generation 15. Reset Function (Pin RESQ and Pin RESQ2) Figure 15-2. Functional Principle of RESQ, RESQ2 Page Figure 15-4. Application Example VEVZ = 5.5V to 40V, VPERI = 1V to 5.5V, VINT = 3.7V to 5.47V VK30, VSAT, and VCORE are within functional range limits, Tj = 40C to 150C Table 15-1. Reset Truth Table Table 15-2. Electrical Characteristics Reset Function (Pin RESQ and Pin RESQ2) Table 15-2. Electrical Characteristics (Continued) Reset Function (Pin RESQ and Pin RESQ2) 16. Watchdog Function Page Page Figure 16-4. Watchdog Trigger Functional Principle (Unsuccessful Watchdog Trigger) Page VPERI > Reset threshold, VCORE > Reset threshold VK30, VEVZ and VVSAT are within functional range limits, Tj = 40C to 150C Table 16-2. Electrical Characteristics Watchdog Function Figure 16-5. Watchdog Trigger 17. LIN/ISO 9141 Interfaces Table 17-1. Electrical Characteristics LIN/ISO 9141 Interfaces Table 17-1. Electrical Characteristics (Continued)LIN/ISO 9141 Interfaces Figure 17-2. Timing LIN/ISO 9141 Interface Table 17-1. Electrical Characteristics (Continued)LIN/ISO 9141 Interfaces 18. Voltage/Current Sources (IASGx Sources) Figure 18-1. Functional Principle of the IASG Interface - VK30 and VVSAT are within functional range limits, Tj = 40C to 150C As defined in Section 4. Functional Range on page 8, CIASGx 10 nF and 825RISENS 5k + Table 18-1. Electrical Characteristics Voltage/Current Sources (IASGx Sources) Table 18-1. Electrical Characteristics (Continued)Voltage/Current Sources (IASGx Sources) ATA6264 [Preliminary] 19. AMUX (Analog Multiplexer for Voltage Measurements) Table 19-1. Electrical Characteristics AMUX (Analog Multiplexer for Voltage Measurements) ATA6264 [Preliminary] 20. UZP Buffer Table 20-1. Electrical Characteristics UZP Buffer 21. Chip Temperature Measurement 22. Serial Interface Commands 22.1 Overview Table 22-1. Electrical Characteristics (Continued) SerialInterface Commands Figure 22-1. Timing Serial Interface 22.2 Set Commands #16#1 Table 22-2. Set of Serial Interface Commands Table 22-3. Key Latch Commands Table 22-4. Watchdog Commands Table 22-5. Switch Commands Table 22-6. Initial Programming (IP Command) Table 22-7. Diagnosis Commands Page 22.3 Serial Interface Status Register Table 22-11. Information Provided by the Itemized Bits of the Status Register Page 23. Test Mode 24. Application Circuits Figure 24-1. Overview of a Typical Airbag System 4929BAUTO01/07 Figure 24-2. Typical Application Circuit ATA6264 26. Package Information 25. Ordering Information Page 28. Table of Contents Page Atmel Corporation Atmel Operations Regional Headquarters Europe Asia Japan