Renesas ZSSC3136BE2T

Overview

ZSSC3136BE2T from Integrated Device Technology (IDT) is a safety-certified sensor signal conditioner IC designed for SIL2-rated resistive bridge sensor switch applications in automotive and industrial systems. It provides 13/14-bit ADC resolution, 105× analog gain, ratiometric analog voltage output (5–95% VDDE), and ZACwire™ digital interface. Its integrated calibration microcontroller compensates offset, sensitivity, temperature drift, and non-linearity using on-chip EEPROM-stored coefficients - enabling high-accuracy (0.25% FSO @ −25 to +85°C) real-time switching in safety-critical position or pressure sensing.

For engineers reviewing the ZSSC3136BE2T datasheet, ZSSC3136BE2T pinout, ZSSC3136BE2T application, or ZSSC3136BE2T equivalent, key selection criteria include its AEC-Q100 qualification, −40 to +150°C extended temperature operation, adjustable digital filter for fast/stabilized switching, dual temperature sensing (internal diode or external thermistor/diode), and fail-safe diagnostics covering sensor connection loss, short detection, and analog front-end integrity.

Technical Context

The ZSSC3136BE2T implements a full-differential analog front-end with programmable gain amplifier (PGA) supporting gains from 2.8× to 105×, enabling precise amplification of low-level bridge sensor signals while maintaining common-mode rejection across 0.29–0.65×VDDA. Its 13/14-bit integrating switched-capacitor ADC operates at up to 200 Hz bandwidth and supports configurable resolution/response trade-offs via oscillator frequency (2–4 MHz) and integration time settings.

Digital signal conditioning is executed by an on-chip 16-bit RISC microcontroller (Calibration Microcontroller, CMC) running ROM-stored correction algorithms. Calibration coefficients are stored in EEPROM and applied in real time to compensate sensor offset, sensitivity, temperature drift, and non-linearity - all without external trimming components. Safety functions include diagnostic monitoring of sensor connection, analog path integrity, and microcontroller health, fulfilling SIL2 requirements per IEC 61508.

Key Specifications

Pinout & Package

Package: JEDEC-compliant SSOP14 (Small Outline Package, 14-pin, 5.3 mm × 6.2 mm, 0.65 mm pitch), RoHS-compliant, rated for −40°C to +150°C operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar sensor signal conditioning applications.

Compared with MAX1452ACM+T and AD8555ARZ, the ZSSC3136BE2T integrates signal conditioning, safety diagnostics, and calibration storage in a single AEC-Q100-qualified package - eliminating external computation, reducing BOM count, and enabling certified SIL2 switch functionality without software development overhead.

Availability

ZSSC3136BE2T is available at Aetrix Electronics and suitable for automotive seat belt switches, industrial hydraulic pressure switches, brake pedal position sensors, and elevator door obstruction detectors requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.

Supply support for ZSSC3136BE2T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Integrated Device Technology (IDT), now part of Renesas Electronics, is a fabless semiconductor company specializing in timing, memory interface, RF, and sensor signal conditioning solutions for automotive, industrial, and communications markets.

The ZSSC313x product line was engineered specifically for high-accuracy, safety-critical resistive bridge sensor applications - delivering integrated calibration, SIL2 diagnostics, and robust environmental operation without external passive trimming.

FAQ

What safety certifications does the ZSSC3136BE2T support?

The ZSSC3136BE2T is designed and validated for SIL2 compliance per IEC 61508 and supports ASIL-B functional safety requirements in automotive applications. Its integrated diagnostics monitor sensor connection loss (≥100 kΩ), short circuits (≤50 Ω), EEPROM integrity, and analog front-end health - all documented in IDT's ZSSC3136 Functional Safety Manual. The ZSSC3136BE2T itself is AEC-Q100 Grade 0 qualified for −40°C to +150°C operation.

How is calibration performed on the ZSSC3136BE2T?

Calibration of the ZSSC3136BE2T is performed via one-pass end-of-line procedure using either the I²C or ZACwire™ interface. During calibration, known sensor inputs at multiple temperatures are applied, and the ZSSC3136BE2T's on-chip microcontroller calculates and stores offset, sensitivity, temperature drift, and non-linearity coefficients directly into its EEPROM. No external processor or algorithm development is required - the ZSSC3136BE2T executes full compensation autonomously during operation.

Does the ZSSC3136BE2T support external temperature sensing?

Yes, the ZSSC3136BE2T supports three temperature sensing modes: internal pn-junction diode, external diode connected to the IRTEMP pin (0–1.5 V range), or external thermistor/half-bridge (0–600 mV/V). External diode sensing uses a programmable 6–20 µA bias current, while resistor sensing applies a dedicated gain path (1200–3500 ppm FS/(mV/V)) - both feeding into the same correction algorithm used for bridge signal conditioning.

What are the output interface options for the ZSSC3136BE2T?

The ZSSC3136BE2T offers two independent output interfaces: a ratiometric analog voltage output (AOUT pin, 5–95% VDDE, 12-bit effective resolution, 2.5 mA drive) and a digital ZACwire™ One-Wire interface. The ZACwire™ interface supports device addressing, configuration read/write, and conditioned sensor data readout over a single wire - eliminating the need for I²C pull-ups or additional GPIOs in space-constrained designs.

Can the ZSSC3136BE2T operate in high-voltage industrial environments?

Yes, the ZSSC3136BE2T features robust protection: absolute maximum ratings of ±33 V on VDDE and AOUT pins, reverse polarity protection, and short-circuit protection on all outputs. Its analog and digital domains are isolated (VDDA/VSSA and VDD/VSSE), and it meets stringent EMC requirements per AEC-Q100. These features allow direct use in 24 V industrial systems without external TVS diodes or protection circuitry in most cases.