TLE6712G Infineon Technologies, TLE6712G Datasheet - Page 6

• Manufacturer Part Number: TLE6712G
• Manufacturer: Infineon Technologies

Specifications of TLE6712G

• Packages: P-DSO-24

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2
2.1
Supply principles:
• The design of the internal supply is such that increasing or decreasing of the supply
• Squib failures such as shorts to ground or battery do not have an influence on other
• An open ground connection does not cause unwanted firing.
2.1.1
Input pin
2.1.2
Input pin
external boost power supply. This Voltage is used for the firing circuits (
2.1.3
Input pin
not externally connected
that the high side switch has a higher voltage drop since the firing voltage is smaller than
V
2.2
The SPI of the Dual Firing Airbag IC is controlled by three input pins: CSN, DI and CLK.
The Chip Select Negative pin CSN allows the individual selection of different slave SPI
devices. Slave devices that are not selected do not interfere with SPI bus activities.
A slave device will be selected by a low signal on pin CSN.
The Data Input pin DI is used for the serial data from the C, synchronously clocked by
the Clock input pin CLK.
All commands, no matter which function, consist of 16 bits, so the airbag IC consists of
a 16 bit input shift register, a 16 bit latch and a decoder logic block for the generation of
the SPI command signals.
To provide higher security and to suppress data transfer errors in the event that the clock
signal includes spikes or glitches, a counter for 16 clock cycles is provided. Only if 16
clock cycles have occurred, the rising edge of CSN causes an internal signal LE (Latch
Enable) to transfer the data from the shift register to the 16 bit latch. A logic block
decodes the 16 bit word of the latch to address the desired functional block.
CHP
voltages
chip functions.
in the case that
Circuit Description
Internal Supply
Logic Supply
Power Supply
Supply Voltage for High Side Gates V
Serial Peripheral Interface (SPI) and Decoder Logic
V
V
V
CHP
CC5
Boost
V
FV12
is the supply for the high side DMOS Gates of the squib drivers. If
is the 5 V logic supply for the Dual Firing Airbag IC.
is a supply voltage for the Dual Firing Airbag IC, that is generated by an
,
V
Boost
V
FVxy
V
,
V
V
CC5
V
Boost
CHP
CHP
= V
,
V
is internally connected to
Boost
S
,
V
.
CC5
causes no unintended firing of the squibs.
6
CHP
V
Boost
by a diode. This means
V 1.61 2001-07-13
V
FV12
TLE 6712
).
V
CHP
is