Renesas ZSSC3240CI2B

Overview

ZSSC3240CI2B from Renesas is a sensor signal conditioner IC for resistive sensors, performing high-accuracy amplification, 24-bit digitization, and digital correction of bridge, half-bridge, Pt100, and diode-based temperature sensors. It delivers calibrated digital outputs via I²C/SPI/OWI and configurable analog outputs (0–1 V, 0–5 V, ratiometric, or 4–20 mA), operating from 2.7 V to 5.5 V across –40°C to 125°C in industrial pressure, flow, and medical sensing systems.

For engineers reviewing the ZSSC3240CI2B datasheet, ZSSC3240CI2B pinout, ZSSC3240CI2B application, or ZSSC3240CI2B equivalent, this page provides verified technical context on its 24-QFN package, programmable 24-bit math core, on-chip diagnostics, sensor supply options (voltage/current mode), and dual-output capability supporting smart sensor modules with wake-up, continuous, or cyclic measurement modes.

Technical Context

The ZSSC3240CI2B integrates a two-stage PGA (gain 1.32–540 V/V) with ±2.5% gain error, a 12–24-bit ADC (ENOB up to 18.1 bits), and a 13–16-bit DAC with 0–150 µs settling time. Its 26-bit math core executes sensor-specific correction algorithms using NVM-stored coefficients for offset, sensitivity, temperature drift, and non-linearity.

It supports three sensor supply configurations - ratiometric (VDDB = 1.75 V), current-mode (5–500 µA bias), and external voltage-source - and includes on-chip diagnostics for sensor connection, memory integrity, and broken-chip detection. The IC operates in three primary modes: wake-up-on-request, continuous/fast-response, and automatic cyclic measurement with scheduler-controlled trade-offs among update rate, accuracy, and power.

Key Specifications

Pinout & Package

Package: 4 × 4 mm² 24-pin QFN with wettable flanks (exposed thermal pad connected to VSS).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ICM-20948 and AD7798, the ZSSC3240CI2B uniquely combines programmable sensor excitation, 26-bit correction math, reprogrammable NVM, and multi-mode analog outputs in a single IC - enabling fully autonomous smart sensor modules without host processor intervention.

Availability

ZSSC3240CI2B is available at Aetrix Electronics and suitable for industrial pressure transducers, medical blood pressure monitors, white goods flow meters, and automotive HVAC temperature sensors requiring stable component supply, long-term calibration retention, and AEC-Q100-aligned reliability.

Supply support for ZSSC3240CI2B 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 sensor solutions for industrial, automotive, and IoT applications.

The ZSSC3240CI2B belongs to Renesas' Smart Sensor Signal Conditioning product line, designed specifically to replace discrete analog signal chains with integrated, calibrated, and programmable solutions for resistive sensors in harsh-environment applications.

FAQ

What sensor types does the ZSSC3240CI2B support?

The ZSSC3240CI2B supports resistive bridge and half-bridge sensors, Pt100 RTDs, NTC/PTC thermistors, and external temperature diodes. It accommodates sensor resistances from 0.5 kΩ to 60 kΩ and signal spans from 1 mV/V to 500 mV/V. Its programmable front-end allows configuration for ratiometric, current-mode, or external voltage-source excitation - making ZSSC3240CI2B compatible with a broad range of legacy and next-generation resistive sensing elements.

Does the ZSSC3240CI2B require external components for basic operation?

No, the ZSSC3240CI2B integrates all essential functions on-die: voltage regulators for VDD and VDDB, a 24-bit ADC, 16-bit DAC, 26-bit math core, NVM for calibration coefficients, and digital interfaces (I²C/SPI/OWI). Only minimal external components are needed - typically decoupling capacitors (e.g., 6.8 nF on VDDB, 22 nF on AOUT) and optional RC filters for EMI suppression. No external op-amps, current sources, or DACs are required for ZSSC3240CI2B to deliver calibrated analog or digital outputs.

How is calibration performed on the ZSSC3240CI2B?

Calibration of the ZSSC3240CI2B is performed by loading sensor-specific correction coefficients (for offset, sensitivity, temperature drift, and non-linearity) into its reprogrammable non-volatile memory (NVM) via I²C, SPI, or OWI. These coefficients are generated during sensor characterization using Renesas-provided software tools and applied at runtime by the on-chip 26-bit math core. The ZSSC3240CI2B retains calibration data across power cycles, eliminating the need for recalibration - a key feature distinguishing ZSSC3240CI2B from generic ADCs or signal conditioners.

Can the ZSSC3240CI2B generate both analog and digital outputs simultaneously?

Yes, the ZSSC3240CI2B supports concurrent analog and digital outputs. For example, it can deliver a 4–20 mA current-loop output while communicating corrected digital values via I²C, or provide a 0–5 V absolute voltage output alongside SPI-based raw ADC readouts. The AOUT/OWI1 pin operates in time-multiplexed or concurrent mode depending on configuration - enabling ZSSC3240CI2B to serve as both a smart sensor node and an analog subsystem interface without external multiplexing.

What diagnostics does the ZSSC3240CI2B provide, and how are they accessed?

The ZSSC3240CI2B provides on-chip diagnostics for sensor connection (open/short detection), memory integrity (NVM CRC check), and broken-chip verification. Diagnostic status is reported through the CHECK_DIAG command, which populates a 16-bit diagnostic register accessible via I²C/SPI/OWI. Each bit corresponds to a specific fault condition - for instance, bit 0 indicates sensor disconnect, bit 15 flags memory corruption. These diagnostics are integral to ZSSC3240CI2B's design for functional safety applications and require no external monitoring circuitry.