Renesas ZSSC3230BI3R

Overview

ZSSC3230BI3R from Renesas Electronics is a capacitive sensor signal conditioner IC that performs high-accuracy capacitance-to-digital conversion with on-chip digital compensation for offset, sensitivity, and temperature drift. It supports 0–30 pF sensor capacitance, delivers up to 18-bit resolution, and outputs corrected values via I²C (up to 3.4 MHz) in industrial humidity and pressure sensing systems.

For engineers reviewing the ZSSC3230BI3R datasheet, ZSSC3230BI3R pinout, ZSSC3230BI3R application, or ZSSC3230BI3R equivalent, this page provides verified technical context, validated pin functions, confirmed operating modes (Sleep/Command/Cyclic), calibrated performance metrics, and real-world application mappings for capacitive sensor front-end design.

Technical Context

The ZSSC3230BI3R integrates a programmable charge-voltage converter (CVC), 12–18-bit ADC, internal temperature sensor (55 LSB/K), and DSP core executing sensor-specific correction math using NVM-stored coefficients. It supports differential and single-ended capacitive sensor interfaces with programmable noise mode and auto-zero calibration.

Its signal flow routes C_MEAS through configurable multiplexer selection into the CVC, then PGA, then ADC, followed by real-time digital compensation of sensor nonlinearity and thermal drift. Output options include I²C (standard/fast/high-speed modes) and pulse-density modulated (PDM) signals synchronized to measurement completion.

Key Specifications

Pinout & Package

Package: 4 × 4 mm², 24-pin PQFN (exposed pad), RoHS-compliant, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with the ZSSC3230BI3R, the ICM-42688-P trades autonomous compensation for multi-sensor integration, while the AD7745 offers higher raw resolution but demands external computation-making the ZSSC3230BI3R optimal for self-contained, ultra-low-power capacitive sensor nodes needing certified accuracy across wide temperature ranges.

Availability

ZSSC3230BI3R is available at Aetrix Electronics and suitable for industrial humidity sensing, automotive pressure monitoring, and medical disposable sensor designs requiring stable component supply, long-term lifecycle support, and guaranteed calibration traceability.

Supply support for ZSSC3230BI3R 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 delivering microcontrollers, analog power, and SoC solutions for automotive, industrial, and IoT markets with emphasis on functional safety and energy efficiency.

The ZSSC3230BI3R belongs to Renesas' Smart Sensor Signal Conditioning family, engineered specifically for high-accuracy, low-power capacitive sensing in harsh environments where self-contained calibration and long-term stability are critical.

FAQ

What is the primary function of the ZSSC3230BI3R in a capacitive sensor system?

The ZSSC3230BI3R serves as a fully integrated capacitive sensor signal conditioner that converts analog capacitance changes into temperature-compensated digital values. It performs offset, sensitivity, and 1st-/2nd-order thermal drift correction using on-chip DSP and NVM-stored coefficients-eliminating the need for external calibration components or host MCU computation. Its role is to deliver ready-to-use, high-accuracy digital sensor data directly to the system controller.

Does the ZSSC3230BI3R support both differential and single-ended capacitive sensor configurations?

Yes, the ZSSC3230BI3R supports both configurations. Differential mode connects C_MEAS between C0 and CC (or CC′), isolating common-mode noise. Single-ended mode connects C_MEAS between CC (or CC′) and VSS, with C0 internally shorted to ground. Pin selection between CC and CC′ is programmable via memory register 19HEX, enabling flexible PCB routing without hardware changes. Both modes operate within the 0–30 pF input range.

What are the power consumption characteristics of the ZSSC3230BI3R in active and sleep states?

In Sleep Mode with one measurement per second, the ZSSC3230BI3R draws just 1.3 µA average current. Its idle current drops to 0.07–1 µA, and active current is 750–1100 µA during conversion. Wake-up time from sleep to analog operation is under 2 ms, and start-up time after power-on is ≤2.5 ms. These figures enable multi-year operation on CR2032 batteries and compatibility with energy-harvesting systems.

How is calibration performed for the ZSSC3230BI3R, and where are coefficients stored?

Calibration is performed using Renesas' PC-based software tool via the I²C interface, which writes sensor-specific offset, span, and temperature compensation coefficients into the ZSSC3230BI3R's on-chip multiple-time programmable (MTP) NVM. This memory retains data for 10 years and supports 1,000–10,000 write cycles. No external EEPROM or trimming components are needed-the ZSSC3230BI3R executes all correction math autonomously using these stored values.

What output interfaces does the ZSSC3230BI3R provide, and what are their key timing capabilities?

The ZSSC3230BI3R provides two digital outputs: I²C (supporting standard, fast, and high-speed modes up to 3.4 MHz) and pulse-density modulated (PDM) signal on the dedicated PDM pin. I²C delivers corrected 16-bit capacitance and 14-bit temperature data at up to 290 Hz. PDM operates exclusively in Cyclic Measurement Mode and provides continuous, self-clocked streaming ideal for MCU timer-capture or FPGA-based demodulation-enabling deterministic latency without polling overhead.