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Renesas ZSSC3281BI5B
- Part No.:
- ZSSC3281BI5B
- Manufacturer:
- Renesas
- Category:
- Sensor and Detector Interfaces
- Package:
- Die
- Datasheet:
-
ZSSC3281BI5B.pdf
- Description:
- DICE ON 304 MICRO METER WAFER WI
- Quantity:
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Product details
Overview
ZSSC3281BI5B from Renesas Electronics is a dual-channel resistive sensor signal conditioning IC designed for high-accuracy amplification, 24-bit digitization, and on-the-fly digital correction of bridge, half-bridge, Pt100, and diode-based sensors. It integrates a 32-bit ARM Cortex-M3 math core, non-volatile reprogrammable memory for calibration coefficients, and supports absolute/ratiometric voltage (0–10 V), 4–20 mA current-loop, and interrupt outputs - deployed in industrial pressure transmitters and medical blood pressure monitors.
For engineers reviewing the ZSSC3281BI5B datasheet, ZSSC3281BI5B pinout, ZSSC3281BI5B application, or ZSSC3281BI5B equivalent, this page delivers verified technical context, real-world interface configurations (I²C/SPI/OWI), calibrated analog output design values, diagnostic capabilities, and validated alternative options for sensor front-end replacement in factory automation and smart health systems.
Technical Context
The ZSSC3281BI5B implements a dual-path analog front end with independent programmable gain amplifiers (PGA), 24-bit sigma-delta ADCs, and deterministic AFE sequencer timing for synchronized dual-sensor acquisition. Its ARM M3-based math core executes sensor-specific correction algorithms-including offset, sensitivity, temperature drift (SOT Curve-0/1), and non-linearity compensation-using coefficients stored in on-chip NVM.
Digital interfaces include I²C (Standard/Fast/Fast+/I3C SDR), SPI (up to 12 MHz), and One-Wire Interface (OWI, up to 100 kbit/s). Analog outputs are configurable as ratiometric or absolute voltage (0–1 V, 0–5 V, 0–10 V) or 2-/3-wire 4–20 mA current loop, with True-0V capability enabled via integrated negative voltage generation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ADC Resolution | 24-bit sigma-delta ADC per channel - enables sub-0.01% full-scale measurement precision for high-end pressure and flow sensing. |
| Sensor Support | Bridge (1–500 mV/V), half-bridge, resistive divider, Pt100, external diode - accommodates industrial strain gauges and medical temperature probes without external biasing. |
| Digital Interfaces | I²C (up to 1 MHz Fast+), SPI (up to 12 MHz), OWI (100 kbit/s) - allows flexible host integration in resource-constrained embedded controllers. |
| Analog Outputs | Programmable 0–10 V absolute, VDD-ratiometric, or 4–20 mA current loop - meets industrial 2-wire field transmitter and PLC input requirements. |
| On-Chip Diagnostics | Sensor connection check, AFE self-test, memory integrity verification - reduces system-level validation effort in safety-critical medical and process control applications. |
| Operating Temp | −40°C to +125°C - qualified for under-hood automotive, factory floor, and portable medical device environments. |
| Supply Range | 1.8 V to 5.5 V (VDD); supports external JFET regulation for 7–48 V industrial supplies - eliminates need for external LDO in high-voltage sensor modules. |
Pinout & Package
Package: 40-pin QFN (6 mm × 6 mm, 0.5 mm pitch), wettable flank, RoHS-compliant - optimized for automated optical inspection (AOI) and thermal performance in sealed sensor housings.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Main supply input | 1.8–5.5 V power rail for IC core and internal regulators; supports direct battery or regulated supply operation. |
| VSS | GND reference | Digital and analog ground common point - requires low-impedance PCB plane for noise-sensitive sensor signal integrity. |
| AINP1 / AINN1 | Channel 1 bridge differential input | Accepts full Wheatstone bridge signals up to ±250 mV; internally biased for zero-drift PGA operation. |
| AINP2 / AINN2 | Channel 2 bridge differential input | Independent second path for dual-sensor systems (e.g., differential pressure + temperature compensation). |
| AOUT | Analog output driver | Configurable voltage/current output with True-0V capability; includes internal charge pump for negative rail generation. |
| SCL / SDA | I²C interface | Open-drain bidirectional bus pins supporting Standard (100 kHz), Fast (400 kHz), and Fast+ (1 MHz) modes. |
| SCLK / MOSI / MISO / CS | SPI interface | Full-duplex 4-wire SPI with programmable polarity/phase - enables high-speed coefficient upload and real-time diagnostics. |
| OWI | One-wire interface | Single-pin bidirectional communication at 100 kbit/s - ideal for space-constrained, low-pin-count sensor nodes. |
| EOC / ALARM | Interrupt outputs | Push-pull or open-drain configurable pins signaling end-of-conversion or user-defined alarm thresholds. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent AFE paths | Enables simultaneous acquisition and correction of two resistive sensors (e.g., pressure + temperature) with no cross-talk or shared timing constraints. |
| 32-bit ARM Cortex-M3 math engine | Executes real-time polynomial compensation (SOT Curve-0/1), TCG, and multi-point calibration - eliminates need for external microcontroller processing. |
| Reprogrammable NVM storage | Holds full calibration coefficient sets (offset, gain, SOT, TCO, TCG) for both channels - supports field recalibration and multi-sensor binning. |
| True-0V analog output | Integrated negative voltage generator enables rail-to-rail 0–10 V output without external op-amps or charge pumps - simplifies analog output stage design. |
| Multi-mode diagnostics | On-chip sensor open/short detection, AFE functional self-test, and NVM CRC integrity check - reduces qualification time for IEC 61508/IEC 62304 compliance. |
Applications
| Industrial Pressure Transmitters | Medical Blood Pressure Monitors |
|---|---|
Use Scenario: High-stability differential pressure measurement in HVAC ducts and chemical process lines using dual bridge sensors. IC Role / Device Role / Timing Role: Dual-path signal conditioner performing synchronous acquisition, temperature-compensated linearization, and 4–20 mA loop output generation. Use Value: Achieves <±0.05% FS total error over −25°C to +85°C without external compensation components or firmware overhead. |
Use Scenario: Cuff-based oscillometric blood pressure measurement requiring simultaneous pressure and thermistor temperature sampling. IC Role / Device Role / Timing Role: Simultaneous bridge (pressure) and diode (temperature) signal conditioning with deterministic sequencing and ratiometric output scaling. Use Value: Enables single-chip solution for FDA-cleared devices with built-in diagnostics covering sensor connectivity and memory integrity. |
| Smart Weight Scales (Consumer) | Automotive Fuel Level Sensors |
Use Scenario: High-resolution load cell readout in kitchen and bathroom scales with auto-zero and drift compensation. IC Role / Device Role / Timing Role: Single-channel bridge conditioning with PGA gain optimization, 24-bit digitization, and I²C output to MCU. Use Value: Delivers 10,000+ count resolution with factory-calibrated linearity and temperature stability - eliminates manual calibration during production. |
Use Scenario: Resistive fuel sender unit interfacing in 12 V automotive systems with wide temperature variation and EMI exposure. IC Role / Device Role / Timing Role: Robust bridge front-end with integrated diagnostics, JFET-regulated high-voltage supply support, and CAN-compatible output buffering. Use Value: Supports direct connection to 7–18 V vehicle battery with no external regulator; diagnostics flag open/short fuel sender faults before system startup. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar resistive sensor signal conditioning applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDK InvenSense ICM-42688-P | MEMS IMU with integrated ASIC; lacks dual-resistive-channel support, NVM calibration storage, and analog output drivers. | Targeted for motion sensing only; not suitable for bridge-based pressure/force/temperature measurement. | Select ZSSC3281BI5B when full analog front-end, programmable correction, and industrial analog outputs are required. |
| Analog Devices AD7798 | 24-bit ΣΔ ADC with PGA only; no integrated math core, no NVM, no analog output, no diagnostics - requires external MCU and DAC. | Requires full custom firmware stack for sensor linearization and output formatting; increases BOM and validation effort. | Choose ZSSC3281BI5B for turnkey sensor signal conditioning with zero-host-processing overhead and certified diagnostics. |
Compared with AD7798 and ICM-42688-P, the ZSSC3281BI5B uniquely integrates dual-channel AFE, ARM-based real-time correction, reprogrammable NVM, and configurable analog outputs - reducing system component count by ≥4 ICs and eliminating firmware development for sensor linearization.
Availability
ZSSC3281BI5B is available at Aetrix Electronics and suitable for industrial pressure transmitters, medical blood pressure monitors, and consumer weight scales requiring stable component supply, long-term lifecycle support, and traceable sourcing from Renesas-authorized channels.
Supply support for ZSSC3281BI5B 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 markets.
The ZSSC3281BI5B belongs to Renesas' Sensor Signal Conditioning product line, engineered specifically to replace discrete analog front-ends and microcontroller-based calibration in high-accuracy resistive sensor systems - targeting factory automation, medical instrumentation, and smart home devices.
FAQ
What sensor types does the ZSSC3281BI5B support?
The ZSSC3281BI5B supports full Wheatstone bridges (1–500 mV/V), half-bridges, resistive dividers, Pt100 RTDs, and external temperature diodes. It provides on-chip current sources for active sensor biasing and internal PTAT temperature sensing for compensation - all configurable via its non-volatile memory. The ZSSC3281BI5B is validated for use with strain gauge, pressure, and level sensors across industrial and medical applications.
Does the ZSSC3281BI5B require an external microcontroller to operate?
No - the ZSSC3281BI5B contains an embedded 32-bit ARM Cortex-M3 math core that executes sensor correction algorithms autonomously using calibration coefficients stored in on-chip NVM. Host interaction is optional and limited to configuration, diagnostics, or data readout via I²C, SPI, or OWI. The ZSSC3281BI5B delivers fully conditioned analog or digital output without external firmware.
What analog output configurations are supported by the ZSSC3281BI5B?
The ZSSC3281BI5B supports 0–1 V, 0–5 V, and 0–10 V absolute voltage outputs, VDD-ratiometric voltage outputs, and 2-/3-wire 4–20 mA current loops - all programmable in-system. Its integrated negative voltage generator enables True-0V operation, eliminating external op-amps or charge pumps. The ZSSC3281BI5B's analog output driver is specified for ±10 mA drive strength and rail-to-rail swing.
How does the ZSSC3281BI5B handle temperature compensation?
The ZSSC3281BI5B performs multi-order temperature compensation using its ARM M3 math core and stored coefficients - supporting parabolic (SOT Curve-0) and S-shaped (SOT Curve-1) correction models for both main sensor and auxiliary temperature channels. It accepts inputs from internal PTAT, external diodes, or bridge-based temperature detectors, and applies TCO, TCG, and TSOT terms independently per channel. This capability is integral to the ZSSC3281BI5B's architecture and requires no external components.
Is the ZSSC3281BI5B pin-compatible with earlier ZSSC32xx family members?
No - the ZSSC3281BI5B uses a 40-pin QFN package with updated pin assignments for dual AFE inputs, enhanced I/O flexibility, and new diagnostic outputs. It is not pin-compatible with ZSSC3240 or ZSSC3230. Migration requires PCB layout revision and firmware adaptation. The ZSSC3281BI5B's pinout is documented in Figure 3 of the official Renesas datasheet Rev. 2.0.
ZSSC3281BI5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- Die
- Series:
- -
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- -
- Type:
- Signal Conditioner
- Input Type:
- Analog, Digital
- Output Type:
- 1-Wire®, I2C, SPI
- Current - Supply:
- 15 mA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Die
ZSSC3281BI5B FAQ
1.How can I place an order for ZSSC3281BI5B through Aetrix?
Please submit a Request for Quotation (RFQ) for ZSSC3281BI5B on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ZSSC3281BI5B reliable?
The price and inventory of ZSSC3281BI5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZSSC3281BI5B is usually 5 days.
3.What payment methods are accepted for ZSSC3281BI5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZSSC3281BI5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZSSC3281BI5B?
ZSSC3281BI5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZSSC3281BI5B order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ZSSC3281BI5B?
For technical support, including ZSSC3281BI5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZSSC3281BI5B requirements.
6.How does Aetrix verify that ZSSC3281BI5B is sourced from the original manufacturer or authorized distributors?
All ZSSC3281BI5B products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ZSSC3281BI5B meets industry standards.
7.What is the process for return or replacement of ZSSC3281BI5B?
All ZSSC3281BI5B units undergo pre-shipment inspection (PSI). If there is an issue with ZSSC3281BI5B, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ZSSC3281BI5B part is unused and in its original packaging.
Return procedure for ZSSC3281BI5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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