Renesas ZSSC3281BI1B

Overview

ZSSC3281BI1B from Renesas Electronics is a dual-channel resistive sensor signal conditioning 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, non-volatile reprogrammable memory 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 ZSSC3281BI1B datasheet, ZSSC3281BI1B pinout, ZSSC3281BI1B application, or ZSSC3281BI1B equivalent, key selection criteria include dual-path AFE architecture, programmable 16-bit DAC output with True-0V capability, I²C/SPI/OWI interface support up to 12 MHz, on-chip diagnostics for sensor connection and memory integrity, and operation across –40°C to +125°C.

Technical Context

The ZSSC3281BI1B implements two independent analog front ends (AFE1/AFE2), each configurable for bridge, half-bridge, resistive divider, or voltage-source sensors with signal spans from 1 mV/V to 500 mV/V. Its math core executes sensor-specific correction algorithms-including offset, sensitivity, temperature drift (SOT Curve-0/1), and non-linearity compensation-using coefficients stored in on-chip NVM.

Dual-speed AFE sequencing enables deterministic measurement timing: high-speed bridge acquisition (up to 1.2 kSPS) paired with sparsely inserted auxiliary temperature measurements (e.g., internal PTAT, external diode, or bridge-as-thermistor). Output post-processing includes IIR filtering, LSB zeroing, EOC/ALARM assertion, and programmable clipping.

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.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ICM-42688-P and AD7798, the ZSSC3281BI1B uniquely integrates dual AFEs, ARM-based real-time correction, and programmable analog outputs - enabling complete smart sensor functionality in one chip without host processor dependency or external signal chain components.

Availability

ZSSC3281BI1B is available at Aetrix Electronics and suitable for industrial pressure transmitters, medical blood pressure monitors, and smart HVAC sensor nodes requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for ZSSC3281BI1B 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 connectivity solutions for industrial, automotive, and IoT markets.

The ZSSC3281BI1B belongs to Renesas' Smart Sensor Signal Conditioning product line, engineered to replace discrete signal chains with single-chip, programmable, and calibrated solutions for high-accuracy resistive sensor applications.

FAQ

What sensor types does the ZSSC3281BI1B support?

The ZSSC3281BI1B supports resistive bridge sensors (full/half-bridge), resistive divider strings, voltage-source elements (e.g., Pt100), and external temperature sensors including diodes and thermistors. Its dual AFE paths allow concurrent interfacing of two independent sensor types - for example, a pressure bridge and an ambient temperature diode - with individual calibration and compensation.

Does the ZSSC3281BI1B require an external microcontroller to operate?

No, the ZSSC3281BI1B contains an embedded 32-bit ARM Cortex-M3 math core that executes sensor correction algorithms autonomously using calibration coefficients stored in on-chip NVM. While it supports host communication via I²C/SPI/OWI for configuration and readout, full operation - including measurement, compensation, and analog output generation - occurs independently without external MCU intervention.

What is the maximum update rate for dual-sensor measurements on the ZSSC3281BI1B?

The ZSSC3281BI1B achieves up to 1.2 kSPS for single-channel bridge measurements in high-speed mode. In dual-channel operation with interleaved AFE sequencing, sustained throughput is 600 SPS per channel while maintaining 24-bit effective resolution and full temperature compensation - verified in the "Dual Speed Mode" section of the official datasheet (Rev. 2.0, p.36).

Can the ZSSC3281BI1B generate a true 0 V output level?

Yes, the ZSSC3281BI1B features a built-in charge pump that generates a negative supply rail, enabling its analog output driver to deliver genuine 0 V output - referred to as "True-0Volt" operation. This capability is essential for compliant 4–20 mA current-loop interfaces and low-voltage sensor systems where ground-referenced zero is required.

How is calibration performed on the ZSSC3281BI1B?

Calibration coefficients for offset, sensitivity, temperature drift (SOT), and non-linearity are programmed into the ZSSC3281BI1B's reprogrammable non-volatile memory (NVM) using Renesas-provided GUI tools and standard I²C/SPI commands. The math core applies these coefficients in real time during signal processing - eliminating need for post-production firmware updates or external calibration storage.