Renesas ZSSC3281BC5B

Overview

ZSSC3281BC5B 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, non-volatile 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 ZSSC3281BC5B datasheet, ZSSC3281BC5B pinout, ZSSC3281BC5B application, or ZSSC3281BC5B equivalent, key selection criteria include dual-path AFE configurability, programmable 16-bit DAC output ranges (0–1 V / 0–5 V / 0–10 V / 4–20 mA), I²C/SPI/OWI interface support up to 12 MHz, on-chip diagnostics, and temperature-compensated non-linearity correction.

Technical Context

The ZSSC3281BC5B implements two independent analog front ends (AFE1/AFE2), each with programmable gain amplifier (PGA), 24-bit sigma-delta ADC, and sequencer-controlled measurement timing. Its ARM M3-based math core executes sensor-specific correction algorithms - including offset, sensitivity, temperature drift (SOT Curve-0/1), and non-linearity - using coefficients stored in reprogrammable NVM.

Dual-path operation enables simultaneous bridge + auxiliary temperature sensing (internal PTAT or external diode/Pt100), with deterministic input step response via SM+/AZ configuration and accelerated bridge measurements using sparsely inserted auxiliary reads. Output post-processing includes LSB zeroing, EOB/EOC/alarm functions, and IIR filtering.

Key Specifications

Pinout & Package

Package: 40-pin QFN (6 mm × 6 mm, 0.5 mm pitch), wettable flank, RoHS-compliant, thermal pad exposed on underside.

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 ZSSC3281BC5B delivers fully autonomous signal conditioning - integrating dual AFE, real-time correction math, reprogrammable NVM, and configurable analog/digital outputs - reducing system-level complexity and accelerating time-to-market for calibrated smart sensors.

Availability

ZSSC3281BC5B is available at Aetrix Electronics and suitable for industrial pressure transmitters, medical blood pressure monitors, and smart weight scales requiring stable component supply, long-lifecycle support, and traceable sourcing.

Supply support for ZSSC3281BC5B 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 ZSSC3281BC5B belongs to Renesas' Smart Sensor Signal Conditioning product line, engineered to replace discrete analog signal chains with integrated, calibrated, and field-programmable sensor interfaces for high-accuracy industrial and medical sensing.

FAQ

What sensor types does the ZSSC3281BC5B support?

The ZSSC3281BC5B supports resistive bridge sensors (full/half-bridge), resistive divider strings, voltage-source elements (e.g., Pt100), and external temperature sensor diodes. It accommodates signal spans from 1 mV/V to 500 mV/V and provides on-chip current sources for excitation. The ZSSC3281BC5B also integrates an internal PTAT sensor and supports up to three external temperature inputs for multi-point compensation.

Does the ZSSC3281BC5B require external microcontroller firmware for sensor correction?

No. The ZSSC3281BC5B contains an embedded 32-bit ARM Cortex-M3 math core that executes sensor correction algorithms (offset, sensitivity, temperature drift, non-linearity) autonomously using calibration coefficients stored in its reprogrammable non-volatile memory. The ZSSC3281BC5B operates independently without host MCU intervention after initial configuration.

What output interface options does the ZSSC3281BC5B provide?

The ZSSC3281BC5B offers I²C (Standard/Fast/Fast+), SPI (up to 12 MHz), and One-Wire Interface (OWI, ≤100 kbit/s) for digital communication. For analog output, it supports programmable 0–1 V, 0–5 V, 0–10 V absolute, VDD-ratiometric voltage, and 4–20 mA 2-/3-wire current loop modes - all generated internally without external DACs or drivers.

Can the ZSSC3281BC5B operate from a 24 V industrial supply?

Yes. The ZSSC3281BC5B supports pre-regulated high-voltage operation via its VDDH pin (7–48 V), enabling direct integration into 24 V loop-powered industrial systems. An external JFET is used for local regulation, while internal LDOs supply clean power to the core and AFE - maintaining performance across wide input voltage ranges.

How does the ZSSC3281BC5B handle temperature compensation for bridge sensors?

The ZSSC3281BC5B performs real-time temperature compensation using either its on-chip PTAT sensor or external diode/Pt100 inputs. Its ARM M3 math core applies SOT Curve-0 (parabolic) or SOT Curve-1 (S-shaped) algorithms stored in NVM to correct offset, sensitivity, and non-linearity drift - achieving <±0.05% FS error over –40°C to +125°C. This compensation is applied per measurement cycle without host involvement.