TIC10024-Q1 Datasheet, PDF (68/81 Pages) Texas Instruments – 24-Input Multiple Switch Detection Interface (MSDI) Device With Adjustable Wetting Current for Automotive Systems

TIC10024-Q1
SCPS268 – SEPTEMBER 2017
10.3 Systems Examples
10.3.1 Using TIC10024-Q1 in a 12 V Automotive System
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US
12-V
Automotive
Battery
Voltage
Regulator
GND
VS VS
VDD
VDD
/INT
/INT
INx
/CS
/CS
SCLK
SCLK
SI
MOSI
SO
AGND DGND EP
MISO
MCU
TIC10024-Q1
Body Control Module
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Figure 43. Typical System Diagram of Battery Connections for TIC10024-Q1
The TIC10024-Q1 is designed to operate with a 12 V automotive system. Figure 43 depicts a typical system
diagram to show how the device is connected to the battery. Care must be taken when connecting the battery
directly to the device on the V_S supply pin (through a reverse-blocking diode) or the input (IN_X) pins since an
automotive battery can be subjected to various transient and over-voltage events. Manufacturers have
independently created standards and test procedures in an effort to prevent sensitive electronics from failing due
to these events. Recently, combined efforts are made with ISO to develop the ISO 16750-2 standard (Road
vehicles -- Environmental conditions and testing for electrical and electronic equipment -- Part 2: Electrical
loads), which describe the possible transients that could occur to an automotive battery and specify test methods
to simulate them.
It shall be noted that the TIC10024-Q1 is designed and tested according to the ISO 16750-2 standard. A few
voltage stress tests and their test conditions are listed below. Exposing the device to more severe transient
events than described by the standard could potentially causes performance degradation and long-term damage
to the device.
• Direct current supply voltage: V_{BAT, min} = 6 V; V_{BAT, max}= 16 V
• To emulate a jump start event, voltage profile described in Figure 44 is used.
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