Renesas ZSSC3123AA1D

Overview

ZSSC3123AA1D from Integrated Device Technology (IDT) is a sensor signal conditioner IC designed for capacitive sensing applications, supporting I²C, SPI, and PDM output modes, operating from 1.8 V to 5.5 V supply, with integrated EEPROM calibration storage and on-chip temperature compensation.

For engineers reviewing the ZSSC3123AA1D datasheet, ZSSC3123AA1D pinout, ZSSC3123AA1D application, or ZSSC3123AA1D equivalent, this evaluation kit enables rapid prototyping, in-circuit calibration, and functional validation of ZSSC3123-based capacitive sensor systems before production integration.

Technical Context

The ZSSC3123AA1D is part of IDT's cLite™ family of highly integrated sensor signal conditioners optimized for single-ended capacitive sensors. It features a 24-bit sigma-delta ADC, programmable gain amplifier, digital temperature compensation engine, and configurable digital outputs including PDM for direct connection to microcontroller PDM interfaces.

It supports factory- and field-programmable calibration coefficients stored in 128-byte EEPROM, with ECC protection, and operates in Normal Operation Mode (NOM) for continuous measurement or Command Mode (CM) for register access and configuration - both accessible via I²C or SPI interface at up to 400 kHz.

Key Specifications

Availability

ZSSC3123AA1D is available at Aetrix Electronics and suitable for capacitive pressure sensing, liquid level detection, proximity sensing, and touchless human-machine interface applications requiring stable component supply and calibrated signal chain performance.

Supply support for ZSSC3123AA1D 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

Integrated Device Technology (IDT), now part of Renesas Electronics, is a fabless semiconductor company specializing in timing, memory interface, RF, and sensor signal conditioning solutions for communications, computing, and industrial markets.

The ZSSC3123AA1D belongs to IDT's cLite™ family of capacitive sensor signal conditioners, engineered specifically to simplify high-accuracy capacitive sensing by integrating analog front-end, digital processing, and nonvolatile calibration in a single TSSOP-14 IC.

FAQ

What is the primary function of the ZSSC3123AA1D?

The ZSSC3123AA1D is a dedicated capacitive sensor signal conditioner IC that measures small capacitance variations, applies digital temperature compensation and linearization, and outputs calibrated data via I²C, SPI, or PDM. It integrates a 24-bit sigma-delta ADC, programmable gain amplifier, EEPROM for calibration storage, and on-chip temperature sensor - all in a TSSOP-14 package. The ZSSC3123AA1D eliminates the need for external calibration components and simplifies system-level design for high-precision capacitive sensing.

Does the ZSSC3123AA1D support PDM output mode?

Yes, the ZSSC3123AA1D supports Pulse Density Modulation (PDM) output mode as one of its three configurable digital interfaces - alongside I²C and SPI. In PDM mode, it delivers a continuous bitstream representing the conditioned sensor value, enabling direct connection to PDM-capable microcontrollers or DSPs without additional protocol handling. This mode is particularly useful in space-constrained or low-power designs where minimizing pin count and software overhead is critical. The ZSSC3123AA1D configures PDM via EEPROM settings and supports real-time switching between output modes.

What voltage range does the ZSSC3123AA1D operate within?

The ZSSC3123AA1D operates from 1.8 V to 5.5 V, making it compatible with both low-voltage battery-powered systems (e.g., coin-cell or single Li-ion) and standard 3.3 V or 5 V industrial rails. Its wide supply range ensures stable performance across varying power conditions without external regulators. Internal voltage references and biasing are supply-independent, preserving ADC accuracy and temperature compensation fidelity across the full 1.8–5.5 V range. The ZSSC3123AA1D maintains full functionality-including EEPROM programming and communication-throughout this range.

How is calibration handled in the ZSSC3123AA1D?

Calibration for the ZSSC3123AA1D is stored in its internal 128-byte EEPROM with ECC protection, holding factory- and field-programmable coefficients for offset, gain, temperature compensation (SOT_tcg, SOT_tco), and higher-order correction terms. Calibration is performed using IDT's cLite™ Evaluation Software, which computes coefficients from raw sensor measurements and writes them directly to EEPROM. The ZSSC3123AA1D applies these coefficients in real time during signal processing, enabling plug-and-play accuracy without host-side computation. Locked EEPROM and I²C address options prevent accidental overwrite in production.

Is the ZSSC3123AA1D pin-compatible with other cLite™ devices like ZSC31210 or ZSSC3122?

Yes, the ZSSC3123AA1D shares the same TSSOP-14 pinout and core register map with ZSC31210 and ZSSC3122, enabling hardware reuse across the cLite™ family. All three devices use identical pin assignments for VDD, VSS, SCL/SDA, READY, ALARM outputs, and capacitive inputs (C0/C1). Differences lie in internal specifications - such as supply range (ZSSC3123 supports 1.8 V min vs. ZSC31210's 2.3 V min) and feature enablement - but PCB layout and socketing remain unchanged. The ZSSC3123AA1D can be substituted on existing boards designed for ZSC31210 or ZSSC3122, provided firmware and EEPROM configuration align with its extended capabilities.