TIC12400-Q1 Datasheet, PDF (1/127 Pages) Texas Instruments – 24-Input Multiple Switch Detection Interface (MSDI) With Integrated ADC and Adjustable Wetting Current for Automotive Systems

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TIC12400-Q1
SCPS260 – AUGUST 2017
TIC12400-Q1 24-Input Multiple Switch Detection Interface (MSDI)
With Integrated ADC and Adjustable Wetting Current for Automotive Systems
1 Features
•1 Qualified for Automotive Applications
• AEC-Q100 Qualified With the Following Results:
– Device Temperature Grade 1: –40°C to 125°C
Ambient Operating Temperature
– Device HBM ESD Classification Level H2
– Device CDM ESD Classification Level C4B
• Designed to Support 12-V Automotive Systems
with Over-voltage and Under-voltage Warning
• Monitors up to 24 Direct Switch Inputs with 10
Inputs Configurable to Monitor Switches
Connected to Either Ground or Battery
• Switch Input Withstands up to 40 V (Load Dump
Condition) and down to –24 V (Reverse Polarity
Condition)
• 6 Configurable Wetting Current Settings:
(0 mA, 1 mA, 2 mA, 5 mA, 10 mA, and 15 mA)
• Integrated 10-bit ADC for Multi-Position Analog
Switch Monitoring
• Integrated Comparator with 4 Programmable
Thresholds for Digital Switch Monitoring
• Ultra-low Operating Current in Polling Mode:
68 μA Typical (t_POLL = 64 ms, t_{POLL_ACT} = 128 μs,
All 24 Inputs Active, Comparator Mode, All
Switches Open)
• Interfaces Directly to MCU Using 3.3 V / 5 V
Serial Peripheral Interface (SPI) Protocol
• Interrupt Generation to Support Wake-Up
Operation on All Inputs
• Integrated Battery and Temperature Sensing
• ±8 kV Contact Discharge ESD Protection on Input
Pins per ISO-10605 With Appropriate External
Components
• 38-Pin TSSOP Package
2 Applications
• Body Control Module and Gateway
• Automotive Lighting
• Heating and Cooling
• Power Seats
• Mirrors
3 Description
The TIC12400-Q1 is an advanced Multiple Switch
Detection Interface (MSDI) designed to detect
external switch status in a 12-V automotive system.
The TIC12400-Q1 features an integrated 10-bit ADC
to monitor multi-position analog switches and a
comparator to monitor digital switches independently
of the MCU. Detection thresholds can be
programmed for the ADC and the comparator to
support various switch topologies and system non-
idealities. The device monitors 24 direct switch inputs,
with 10 inputs configurable to monitor switches
connected to either ground or battery. 6 unique
wetting current settings can be programmed for each
input to support different application scenarios. The
device supports wake-up operation on all switch
inputs to eliminate the need to keep the MCU active
continuously, thus reducing power consumption of the
system. The TIC12400-Q1 also offers integrated fault
detection, ESD protection, and diagnostic functions
for improved system robustness. The TIC12400-Q1
supports 2 modes of operations: continuous and
polling mode. In continuous mode, wetting current is
supplied continuously. In polling mode, wetting
current is turned on periodically to sample the input
status based on a programmable timer, thus the
system power consumption is significantly reduced.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TIC12400-Q1
TSSOP (38)
9.70 mm x 4.40 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
VBAT
Simplified Schematic
Voltage
Regulator
GND
37 38
VS VS
13 IN0
VDD 19
14 IN1
25 IN2
33 IN9
/INT 24
/CS 15
SCLK 16
SI 17
34 IN10
35 IN11
SO 18
TIC12400-Q1
RESET 21
36 IN12
CAP_A 20
12 IN23
CAP_D 23
CAP_PRE 22
VDD
/INT
/CS
SCLK ^MCU
MOSI
MISO
GPIO
EP
AGND 9
DGND 28
Copyright © 2016, Texas Instruments Incorporated
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.