Renesas ZSSC3224BI2B

Overview

ZSSC3224BI2B from Integrated Device Technology (IDT) is a 24-bit sensor signal conditioner IC designed for high-accuracy amplification, digitization, and digital compensation of resistive bridge or absolute voltage sensors. It integrates a programmable gain amplifier (6.6–216×), 24-bit ADC, 18-bit internal temperature sensor, 26-bit DSP, and MTP memory - delivering ±0.10% FSO accuracy from –40°C to +85°C in barometric, pressure, and thermopile sensing systems.

For engineers reviewing the ZSSC3224BI2B datasheet, ZSSC3224BI2B pinout, ZSSC3224BI2B application, or ZSSC3224BI2B equivalent, this page delivers verified technical context on I²C/SPI interface configuration, die-level pad mapping, calibrated temperature output generation, and low-power operation down to 20nA sleep current - critical for portable navigation, industrial pressure modules, and battery-powered environmental sensing.

Technical Context

The ZSSC3224BI2B implements a dual-stage analog front end with configurable gain polarity and auto-zeroed 24-bit sigma-delta ADC, supporting both differential (INP/INN) and pseudo-differential sensor inputs. Its internal 18-bit temperature sensor feeds real-time thermal drift data into the 26-bit DSP core for simultaneous 1st- and 2nd-order offset, span, and nonlinearity correction.

Digital outputs are delivered via configurable I²C (≤3.4 MHz) or SPI (≤20 MHz) interfaces, with EOC interrupt signaling and SS slave select support. Calibration coefficients are stored in on-chip MTP memory and applied in real time - enabling one-pass factory calibration without external trimming components or post-assembly rework.

Key Specifications

Pinout & Package

Package: 4.0 mm × 4.0 mm × 0.85 mm 24-PQFN with exposed thermal pad (non-electrical). Pin assignments conform to IDT's standard ZSSC3224 24-PQFN footprint per datasheet Figure 1.2 and Table 1.2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX1452ACM+T and AD7793BRUZ, the ZSSC3224BI2B uniquely integrates 26-bit DSP, on-chip temperature sensing, and MTP-programmable compensation - enabling fully self-contained, factory-calibrated sensor modules with no host-side math or external memory.

Availability

ZSSC3224BI2B is available at Aetrix Electronics and suitable for barometric altitude measurement, industrial pressure sensing, and thermopile-based object temperature applications requiring stable component supply, long-term calibration retention, and ultra-low-power operation.

Supply support for ZSSC3224BI2B 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, designs high-performance timing, memory interface, RF, and sensor signal conditioning solutions for communications, computing, and industrial markets.

The ZSSC3224BI2B belongs to IDT's precision sensor signal conditioner product line, engineered specifically for high-resolution, low-power, factory-calibrated sensor modules in automotive, industrial, and portable environmental sensing applications.

FAQ

What is the primary function of the ZSSC3224BI2B in a sensor system?

The ZSSC3224BI2B serves as a complete sensor signal conditioner IC that acquires, amplifies, digitizes, and digitally compensates analog signals from resistive bridge or absolute voltage sensors. It integrates a 24-bit ADC, programmable gain amplifier, 18-bit internal temperature sensor, 26-bit DSP, and MTP memory - delivering fully corrected digital output via I²C or SPI without requiring external compensation circuitry. The ZSSC3224BI2B enables high-accuracy, low-power, and compact sensor module designs.

Does the ZSSC3224BI2B support both I²C and SPI interfaces simultaneously?

No - the ZSSC3224BI2B supports either I²C or SPI, selected at power-up based on the state of the RES pin. When RES is held low during VDD ramp-up, the device initializes in I²C mode (SCLK/SCL and MOSI/SDA operate as I²C clock and data lines). When RES is high during startup, it enters SPI mode (SCLK/SCL becomes SCLK, MOSI/SDA becomes MOSI, and SS enables slave selection). The ZSSC3224BI2B does not support concurrent or dynamic switching between protocols.

How is calibration performed for the ZSSC3224BI2B?

Calibration of the ZSSC3224BI2B is performed off-line using IDT's PC-based calibration software and evaluation hardware. During calibration, raw sensor data is collected across temperature and stimulus ranges, and the software computes 26-bit correction coefficients (for offset, gain, and 1st-/2nd-order temperature effects) which are then programmed into the on-chip MTP memory via the serial interface. Once programmed, the ZSSC3224BI2B applies these corrections autonomously - no host intervention is needed during operation. The ZSSC3224BI2B supports >100 MTP write cycles for field re-calibration if required.

What is the role of VDDB and VSSB pins on the ZSSC3224BI2B?

VDDB (Pin 3) and VSSB (Pin 14) form a dedicated, isolated analog supply pair for external resistive bridge sensors. VDDB provides a regulated 1.68 V (±4%) excitation voltage capable of sourcing up to 16.5 mA, while VSSB serves as the dedicated return path - electrically separated from the main VSS ground to prevent noise coupling and improve PSRR. This isolation ensures high-accuracy bridge measurements by eliminating ground-loop errors between sensor and signal conditioner. The ZSSC3224BI2B does not use VDDB/VSSB for absolute voltage sensors like thermopiles.

Can the ZSSC3224BI2B operate from a 1.8 V supply?

Yes - the ZSSC3224BI2B operates across a 1.68 V to 3.6 V supply range, making 1.8 V fully supported. At 1.8 V, typical active current consumption is ~1.05 mA, and PSRR remains >60 dB (per datasheet Table 4.1). The internal voltage regulator maintains stable core and analog bias voltages across this range, ensuring consistent 24-bit ADC performance and DSP operation. The ZSSC3224BI2B also supports 1.8 V I/O logic levels, simplifying interface with modern low-voltage microcontrollers without level shifters.