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PDF ATA6264 Data sheet ( Hoja de datos )
| Número de pieza | ATA6264 | |
| Descripción | Airbag Power Supply IC | |
| Fabricantes | ATMEL Corporation | |
| Logotipo |  |
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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
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
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4929A–AUTO–10/06
1 page  
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ATA6264 [Preliminary]
Table 2-1.
Pin
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
Pin Description
Symbol Function
VPERI Input for the VPERI regulator, internally used VPERI supply
SVPERI Output of VPERI regulator power transistor
GNDA Analog GND
VCORE Input for VCORE regulator
COMSATI Input of the VSAT externally compensated error amplifier
VINT Output of internal supply voltage
GNDD Digital GND
VSAT Input for VSAT regulator, internally used VSAT supply
SVSAT Output of VSAT regulator power transistor
EVZ Input for EVZ regulator, internally used EVZ supply
K15 Connection to car battery via the ignition key
COMSATO Output of the VSAT externally compensated error amplifier
COMCOI Input of the VCORE externally compensated error amplifier
COMCOO Output of the VCORE externally compensated error amplifier
CP-OUT Switchable output of charge pump voltage
SVCORE Output of VCORE regulator power transistor
CP Charge pump output
FBEVZ Input for external resistor divider to adjust EVZ voltage
OCEVZ Input for overcurrent measurement of the EVZ regulator
GEVZ Gate driver output for the external FET of the EVZ regulator
GNDB GND connection of all power stages
COMEVZO Output of the EVZ externally compensated error amplifier
4929A–AUTO–10/06
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ATA6264 [Preliminary]
5.1 Discharger Circuit
Applications using the ATA6264 usually use a reverse polarity protection diode (D1 in Figure
5-1) in the power supply to prevent any damage if the wrong polarity is applied to VK30. Unfortu-
nately, this method includes some risk as can be seen in the following description:
During Standby mode (VK15 < 3V and KEYLATCH = OFF) the IC consumes only a low current,
IK30. Any peaks on the supply voltage (VPulse in Figure 5-1) will gradually charge the blocking
capacitor (C1). D1 prevents the capacitor from being discharged via the power supply and the
very small quiescent current via the IC can also be neglected. This means that during long peri-
ods of Standby mode, the IC’s supply voltage could increase continuously until finally the
maximum supply voltage limit would be exceeded and the IC could be damaged. ATA6264
therefore features a discharger circuit which avoids such unwanted effects. If VK30 exceeds a
threshold value of approximately 26.8V, the blocking capacitor is discharged via an integrated
resistor until VK30 again falls below the threshold.
Figure 5-1. Discharger Circuit
D1
K30
8 kΩ
C1 VBatt
VPulse
26.8V
5.2 Initial Programming of the ATA6264
The ATA6264 supports different output voltages at the VSAT, VPERI and the VCORE regula-
tors. In addition, different modes at the ISO9141 interfaces can be adjusted at the initial
programming (IP). The memory cells are one-time programmable (OTP) and cannot be changed
after the IP (default values are “0”). In general, the IP is done after mounting the ATA6264 on the
PCB with an in-circuit tester. The programming voltage of 11.7V has to be applied on pin VSAT.
It is also possible to use the VSAT regulator as the programming voltage because VSAT is pro-
grammed to 11.7V (±0.5V) as long as the Test mode is entered and the lock bit is not set. To
ensure proper programming of the ATA6264, at least a 10-µF electrolytic cap and a 100-nF
ceramic cap have to be applied at pin VSAT.
4929A–AUTO–10/06
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| Páginas | Total 70 Páginas | |
| PDF Descargar | [ Datasheet ATA6264.PDF ] | |
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