Renesas ZSSC3240CI6B

Overview

ZSSC3240CI6B from Renesas is a sensor signal conditioning IC (SSC) for high-accuracy amplification, digitization, and correction of resistive sensor signals-including bridge, half-bridge, Pt100, and external diode sensors-featuring 24-bit ADC resolution, 16-bit DAC output, I²C/SPI/OWI interfaces, and -40°C to +125°C operation in a 24-QFN package. It enables smart analog/digital sensor modules with ratiometric voltage, 0–5 V absolute voltage, or 4–20 mA current-loop outputs.

For engineers reviewing the ZSSC3240CI6B datasheet, ZSSC3240CI6B pinout, ZSSC3240CI6B application, or ZSSC3240CI6B equivalent, key selection criteria include supported sensor configurations (0.5 kΩ–60 kΩ), programmable measurement scheduler, on-chip diagnostics (sensor connection, memory integrity), and dual-output capability (digital interface + analog output).

Technical Context

The ZSSC3240CI6B integrates a 24-bit sensor-signal-conditioning math core executing digital compensation for offset, sensitivity, temperature drift, and non-linearity using calibration coefficients stored in reprogrammable NVM. Its analog front-end includes a programmable-gain amplifier (1.32–540 V/V) and supports both ratiometric and current-mode sensor excitation.

Digital interfaces include SPI (up to 10 MHz), I²C (Standard/Fast/High-Speed modes), and one-wire interface (OWI, up to 100 kbit/s), all configurable for calibration and/or real-time sensor data readout. Three operating modes-wake-up-on-request, continuous/fast-response, and automatic/cyclic measurement-enable optimization across power, update rate, accuracy, and self-diagnostic coverage.

Key Specifications

Pinout & Package

Package: 4 × 4 mm² 24-QFN with wettable flanks (exposed thermal pad connected to VSS). Pinout validated per Renesas ZSSC3240 datasheet Rev. Dec.10.24, Page 6–7.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7798 and ICM-20948, the ZSSC3240CI6B uniquely combines programmable sensor excitation, on-the-fly digital correction, reprogrammable NVM, and flexible analog/digital outputs-enabling fully autonomous smart sensor modules without host MCU intervention for basic operation.

Availability

ZSSC3240CI6B is available at Aetrix Electronics and suitable for industrial process automation, medical pressure monitoring, HVAC sensor modules, and automotive fluid-level sensing requiring stable component supply, long-lifecycle support, and traceable sourcing.

Supply support for ZSSC3240CI6B 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 ZSSC3240CI6B belongs to Renesas' Sensor Signal Conditioner product line, designed specifically to simplify high-accuracy resistive sensor integration-replacing discrete signal chains with a single IC supporting bridge, RTD, and diode-based sensing topologies.

FAQ

What sensor types does the ZSSC3240CI6B support?

The ZSSC3240CI6B supports resistive bridge sensors (full/half-bridge), Pt100 RTDs, NTC/PTC thermistors, and external temperature diodes. It accommodates sensor resistances from 0.5 kΩ to 60 kΩ and accepts input spans from 1 mV/V to 500 mV/V. The ZSSC3240CI6B uses its on-chip current source or ratiometric supply to excite these elements and applies digital correction for offset, sensitivity, temperature drift, and non-linearity.

Does the ZSSC3240CI6B support both digital and analog outputs simultaneously?

Yes, the ZSSC3240CI6B supports concurrent digital and analog outputs-for example, I²C or SPI communication while delivering 0–5 V absolute voltage or 4–20 mA current-loop output. The AOUT/OWI1 pin operates in analog output mode while OWI2in handles OWI communication in current-loop configurations, and EOC provides timing synchronization. This dual-output capability is confirmed in the ZSSC3240CI6B datasheet Figures 4, 20, and 21.

How is calibration performed on the ZSSC3240CI6B?

Calibration for the ZSSC3240CI6B is performed by loading sensor-specific correction coefficients (offset, sensitivity, temperature coefficients, non-linearity terms) into its reprogrammable non-volatile memory (NVM) via I²C, SPI, or OWI. These coefficients drive the 24-bit math core to compute corrected sensor outputs (S and T values). The ZSSC3240CI6B supports field updates and does not require factory-only programming-the same device can be reconfigured for different sensors or ranges post-deployment.

What diagnostics does the ZSSC3240CI6B provide?

The ZSSC3240CI6B includes on-chip diagnostics for sensor connection (open/short detection), memory integrity (NVM CRC check), and broken-chip verification. Diagnostic status is accessible via the CHECK_DIAG command and reported in the diagnosticreg[15:0] register (Table 17). These functions operate autonomously during normal operation and require no external components-enabling functional safety compliance in industrial and medical applications.

Can the ZSSC3240CI6B operate above 5.5 V supply voltage?

Yes, the ZSSC3240CI6B supports supply voltages up to 48 V using an external transistor regulated by the LDOctrl pin. When configured with an external JFET or bipolar transistor, the ZSSC3240CI6B generates a target VDD of 4.6–5.5 V (per Table 37) while accepting 5–48 V at the input. This extends operation beyond the native 2.7–5.5 V range and is explicitly documented in Section 6.7 and Figure 25 of the ZSSC3240CI6B datasheet.