Datasheet ZSSC4175D-01 (IDT)

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Automotive Sensor Signal Conditioner for Thermocouples ZSSC4175D-01 with SENT Output Datasheet Description Features
The ZSSC4175D-01 is a member of IDT’s family of CMOS  Two differential thermocouple element inputs and an on-chip integrated circuits for highly accurate amplification and sensor- temperature sensor, available for cold-junction compensation specific correction of two signals from thermocouple elements. and temperature output Digital compensation of offset, sensitivity, temperature drift, and  Operating temperature range: -40°C to 150°C nonlinearity is accomplished via a 16-bit RISC microcontroller.  Accuracy: up to 5K at 1000°C hot junction Calibration coefficients and configuration data are stored in the  Supports N-type thermocouples ZSSC4175D-01 nonvolatile memory (NVM), which is reliable in automotive applications.  NVM memory for configuration, calibration data, and configurable measurement and conditioning functionality Measured values are provided via a digital SENT interface. The  SENT output compliant to SAE J2716 JAN2010 (SENT SENT interface enables transmission of conditioned thermocouple Rev. 3) and APR2016 (SENT Rev. 4) standard (refer to data via its Fast Channel as well as transmission of supplementary section 7.6 for details) data via its Serial Data Message (SDM) Channel (also referred to as the “slow” channel) using only one output pin. End-of-line  Supports output of one or more thermocouple signals and calibration is also supported through this output pin via a One-Wire product identification via a single SENT interface connection Interface (OWI). The ZSSC4175D-01 and the calibration  End-of-line calibration process minimizes production costs equipment communicate digitally, so the noise sensitivity is greatly  No external trimming or components required reduced. Digital calibration helps keep assembly cost low as no  Qualified according to AEC-Q100 Grade 0 trimming by external devices or lasers is needed.  Enhanced diagnostic features for sensor module The ZSSC4175D-01 is optimized for automotive environments by over-voltage and reverse-polarity protection circuitry, excellent electromagnetic compatibility, and multiple diagnostic features.
Physical Characteristics
 Supply voltage: 4.5V to 5.5V
Typical Applications
 Over-voltage and reverse-polarity protection up to ±18V  Input span: -5mV to 80mV thermocouple voltage range  Exhaust Systems  ADC resolution: 14-bit 
Available Support
Output resolution: 12-bit via SENT interface  Package: 24-QFN (4  4 mm; wettable flanks)  Evaluation Kit  Application Notes
ZSSC4175D-01 Basic Circuit
 Calculation Tools RSENT
BR1P DOUT
SENT CLOAD
BOT EMC Filter VSSE
GND
BR1N
C1
D 5 VDDE
VCC
TS1 7 1
VSSA
4 TOP SCL
SCL
C S TS2 S SDA
SDA
Z BR2P VSSA VSSA EMC Filter
C2
BR2N VDDA VDDA
VSSA © 2019 Integrated Device Technology, Inc. 1 June 7, 2019 Document Outline 1. Pin Assignments 2. Pin Descriptions 3. Absolute Maximum Ratings 4. Operating Conditions 5. Electrical Characteristics 6. Interface Characteristics and Nonvolatile Memory 7. Circuit Description 7.1 General Operation Description 7.2 Signal Path 7.3 Signal Conditioning 7.3.1 Thermocouple Sensor Signal Conditioning 7.3.2 Internal Temperature Sensor Signal Conditioning 7.4 Analog Front-End 7.4.1 Overview 7.4.2 SCCM 7.4.3 Input Multiplexer 7.4.4 Programmable Gain Amplifier 7.4.5 Analog-to-Digital Converter 7.5 Signal Measurement 7.5.1 Thermocouple Element Measurement 7.5.2 Internal Temperature Measurement 7.5.3 Isolation Conductance Measurement (Giso) 7.5.4 Thermocouple Resistor Measurement (Ropen) 7.5.5 Measurement Cycle 7.6 SENT Output 7.6.1 Overview 7.6.2 SENT Fast Channel Modes and Frame Format 7.6.3 SENT SDM Channel Modes 7.6.4 SENT Output Operation Modes 7.6.5 SENT Pulse Shaping 7.7 NVM OEM Data Memory 7.8 Over-Voltage and Short-Circuit Protection 8. Fault-Safe Operation 8.1 Fault-Safe Operation Modes 8.2 Fault Messaging 8.2.1 Overview 8.2.2 SENT Fast Channel Fault Codes 8.2.3 SENT Status Bits 8.2.4 SENT SDM Channel Status Codes 8.2.5 Timing Definitions 9. Fault Checks 9.1 Overview 9.2 Hardware Fault Checks 9.3 Application Monitors 9.4 Transmission Fault Checks 10. Application Circuit and External Components 11. ESD Protection and EMC Specification 11.1 ESD Protection 11.2 Electromagnetic Emission 11.3 Conducted Susceptibility (DPI) 12. Reliability and RoHS Conformity 13. Package Outline Drawings 14. Marking Diagram 15. Glossary 16. Ordering Information 17. Revision History