Renesas ZSSC3281BI2B

Overview

ZSSC3281BI2B from Renesas Electronics is a dual-channel resistive sensor signal conditioner IC designed for high-accuracy amplification, 24-bit digitization, and real-time digital correction of bridge, half-bridge, Pt100, and diode-based sensors. It integrates a 32-bit ARM Cortex-M3 math core, reprogrammable NVM for calibration coefficients, and supports absolute/ratiometric voltage (0–10 V), 4–20 mA current-loop, and interrupt outputs - deployed in industrial pressure transmitters and medical blood pressure monitors.

For engineers reviewing the ZSSC3281BI2B datasheet, ZSSC3281BI2B pinout, ZSSC3281BI2B application, or ZSSC3281BI2B equivalent, key selection criteria include dual-path AFE configurability, I²C/SPI/OWI interface flexibility, on-chip diagnostics (sensor connection, AFE self-test, memory integrity), and support for wide supply (1.8–5.5 V) and temperature (−40°C to +125°C) ranges in harsh environments.

Technical Context

The ZSSC3281BI2B implements two independent analog front ends with programmable gain amplifiers (PGA), 24-bit sigma-delta ADCs, and deterministic sequencer-controlled measurement timing. Each channel supports configurable excitation (current source or external voltage), auxiliary temperature sensing (internal PTAT, external diode, or bridge-as-thermistor), and dual-speed AFE operation for optimized power/performance trade-offs.

Its 32-bit ARM M3 math core executes sensor-specific correction algorithms-including offset, sensitivity, 2nd-order temperature drift (SOT Curve-0/1), and nonlinearity compensation-using coefficients stored in nonvolatile memory. Output post-processing includes LSB zeroing, IIR filtering, EOB/EOC/ALARM functions, and programmable analog output scaling with True-0V capability.

Key Specifications

Pinout & Package

Package: 40-pin QFN (6 mm × 6 mm, 0.5 mm pitch), wettable flank, RoHS-compliant, thermal pad exposed on bottom for enhanced heat dissipation in sealed sensor modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7798 and ICM-42688-P, the ZSSC3281BI2B uniquely integrates a programmable 32-bit math core, reprogrammable NVM, dual AFE paths, and analog output drivers - delivering a complete, calibrated sensor subsystem in a single QFN package without external firmware development.

Availability

ZSSC3281BI2B is available at Aetrix Electronics and suitable for industrial pressure transmitters, medical blood pressure monitors, and smart HVAC thermostats requiring stable component supply, long-term lifecycle support, and traceable sourcing for certified production programs.

Supply support for ZSSC3281BI2B 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

Renesas Electronics is a global semiconductor leader specializing in microcontrollers, analog, power, and SoC solutions for industrial, automotive, and IoT markets.

The ZSSC3281BI2B belongs to Renesas' Sensor Signal Conditioning product line, engineered to replace discrete signal chains with fully integrated, calibrated, and programmable sensor interface ICs for high-reliability industrial and medical applications.

FAQ

What sensor types does the ZSSC3281BI2B support?

The ZSSC3281BI2B supports resistive bridge sensors (full/half-bridge), Pt100 RTDs, external temperature diodes, and voltage-source elements. Its dual AFE paths accept signal spans from 1 mV/V to 500 mV/V, and it provides on-chip current sources for excitation - making ZSSC3281BI2B ideal for strain gauge, pressure, and level sensing applications where precision and configurability are critical.

Does the ZSSC3281BI2B include nonvolatile memory for calibration data?

Yes, the ZSSC3281BI2B includes reprogrammable nonvolatile memory (NVM) that stores sensor-specific calibration coefficients for offset, sensitivity, temperature drift, and nonlinearity correction. This NVM is used by the integrated 32-bit ARM M3 math core to execute real-time compensation algorithms - enabling ZSSC3281BI2B to deliver calibrated output without external processing or EEPROM.

Can the ZSSC3281BI2B generate a true 0 V analog output?

Yes, the ZSSC3281BI2B features an integrated charge-pump negative voltage generator that enables true 0 V output capability on its AOUT pin. This allows absolute voltage outputs such as 0–1 V, 0–5 V, or 0–10 V without requiring external dual supplies or op-amp circuitry - a key advantage of ZSSC3281BI2B in PLC and industrial analog input interfacing.

What digital interfaces does the ZSSC3281BI2B support?

The ZSSC3281BI2B supports I²C (Standard/Fast/Fast+), SPI (up to 12 MHz), and One-Wire Interface (OWI, up to 100 kbit/s). All interfaces are independently configurable and can coexist on the same device - giving designers flexibility to match host controller capabilities while maintaining ZSSC3281BI2B's full feature set across applications from high-speed industrial controllers to cost-sensitive consumer devices.

How does the ZSSC3281BI2B handle temperature compensation?

The ZSSC3281BI2B supports multiple temperature sensing methods: internal PTAT sensor, external diode, bridge-as-thermistor, and up to three discrete external temperature sensors. Its 32-bit math core applies SOT Curve-0 (parabolic) or SOT Curve-1 (S-shaped) compensation models using coefficients stored in NVM - allowing ZSSC3281BI2B to correct for complex thermal drift behavior across its full −40°C to +125°C operating range.