TLE7729 Datasheet, PDF (1/2 Pages) Infineon Technologies AG – 4 Channel Airbag Satellite Receiver IC SatRICTM

TLE 7729
4 Channel Airbag Satellite Receiver IC
SatRIC^TM
Product Brief
T h e T L E 7 7 2 9 – SatRIC^TM - is a highly integrated interface IC specially
designed for automotive restraint applications. The device, located in the ECU
(Electronic Control Unit) of the airbag system, is able to receive data from different
types of intelligent sensors like inertia and pressure sensor satellites for front-,
side-, or rear-crash sensor applications. It provides a pre-regulated power supply
voltage to the satellites over a twisted pair of wires. The satellite module transmits
digital data to TLE 7729 by modulating the line current.
Applications
■ Automotive Restraint Applications
Embedded Diagnostic Functions
■ Leakage detection to GND and Battery
■ Ground loss detection
■ Short to GND and open detection at every
reference pins
I_REF 23
V_CC
V_SYNC12
V_SYNC34
V_BUS12
6
28
15
1
Power Supply
&
Control
V_SYNCxy
V_BUSCxy
V_BUS34
14
22 SATREF12
20 SATREF34
Features
■ 4 independent satellite receiver channels for current modulated data
■ Each channel can support up to two satellites with
a total of up to eight sensors
■ Data rate 125 kBaud
■ Support of 11-, 13-, 18-Bit Manchester 1 or 2 encoded messages
■ Channel configuration in pairs (Bus Mode, Protocol Type)
■ Supply of satellite channels via 4 independent voltage regulators
■ Adjustable current level detection thresholds
■ Asynchronous and synchronous data transmission modes
■ All digital I/Os are 3.3 V and 5 V compatible
■ 4 Digital outputs for voltage-converted received satellite signals
■ 16-bit 8 MHz Serial Peripheral Interface (SPI)
■ Embedded protocol handler for data preprocessing
■ Small P-TSSOP-28 Package
SATFD1 27
Sense
&
Control
SATFD1 - Driver
6 V/11 V
Logic
24 RIN
Protocol
Handler
&
Control
Logic
8 CLK
18 SATSYNC
11 RxD3
4 RxD2
25 RxD1
SATFD2 2
SATFD3 13
SATFD4 16
SATFD 2 - Driver
SATFD 3 - Driver
SATFD 4 - Driver
9 MOSI
SPI
Interface
5 MISO
19 CS
10 SCK
TLE 7729
21
7
26
17
AGND DGND N.C. N.C.
3
N.C.
12
TEST
Start
Bits
CRC
Sensor
Status
Sensor Data
Embedded Protection Functions
■ Current limitation in case of satellite output shorted to GND or Battery
■ Channel specific over-temperature shutdown
Communication Status
Protocol Handler
HW Status
Channel
Address
P
System
Status
Receiver Data
www.infineon.com/restraint-system-IC
Automotive Power