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Renesas ZSSC3281BC8R
- Part No.:
- ZSSC3281BC8R
- Manufacturer:
- Renesas
- Category:
- Sensor and Detector Interfaces
- Package:
- -
- Datasheet:
-
ZSSC3281BC8R.pdf
- Description:
- SMART SENSOR -> BUMPED DIE
- Quantity:
- Payment:
- Shipping:
Inventory:1,250
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Product details
Overview
ZSSC3281BC8R from Renesas Electronics is a dual-channel resistive sensor signal conditioning IC designed for high-accuracy amplification, 24-bit digitization, and real-time digital correction of bridge, half-bridge, Pt100, and diode-based sensors. It integrates a 32-bit ARM Cortex-M3 math core, reprogrammable NVM 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 ZSSC3281BC8R datasheet, ZSSC3281BC8R pinout, ZSSC3281BC8R application, or ZSSC3281BC8R equivalent, this page delivers verified technical context, I²C/SPI/OWI interface timing, dual AFE channel configuration, on-chip diagnostics, and calibrated analog output design guidance - critical for sensor module development requiring <±0.1% FS total error and field-reprogrammable compensation.
Technical Context
The ZSSC3281BC8R implements two independent analog front ends (AFE1/AFE2), each with programmable gain amplifier (PGA), 24-bit sigma-delta ADC, and configurable measurement sequencing. Sensor excitation is supported via on-chip current sources (up to 1.5 mA) or external voltage sources, enabling direct connection to Wheatstone bridges (1–500 mV/V span) and single-element resistive sensors.
Digital signal conditioning runs on an embedded ARM Cortex-M3 core executing sensor-specific algorithms - including offset, sensitivity, temperature drift (SOT Curve-0/1), and nonlinearity correction - using coefficients stored in 4 kB reprogrammable NVM. Output post-processing includes IIR filtering, LSB zeroing, EOC/ALARM logic, and output clipping with diagnostic range assignment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ADC Resolution | 24-bit sigma-delta with effective resolution ≥21.5 ENOB - enables sub-0.01% FS measurement precision for high-end pressure sensing. |
| Sensor Input Span | 1 mV/V to 500 mV/V - accommodates low-output MEMS bridges and high-sensitivity strain gauges without external gain staging. |
| Digital Interfaces | I²C (Standard/Fast/Fast+), SPI (≤12 MHz), One-Wire (≤100 kbit/s) - supports mixed-protocol systems and legacy bus integration. |
| Analog Outputs | Programmable 0–1 V / 0–5 V / 0–10 V absolute, VDD-ratiometric, or 4–20 mA 2-/3-wire loop - eliminates need for external DACs or loop drivers. |
| Temperature Compensation | On-chip PTAT sensor + up to 3 external temperature inputs (diode, RTD, TC) - enables dual-sensor thermal drift modeling per channel. |
| Operating Supply | 1.8 V to 5.5 V (direct VDD) or 7 V to 48 V (with external JFET pre-regulator) - suitable for both battery-powered wearables and industrial 24 V systems. |
| Diagnostics | Integrated AFE self-test, sensor open/short detection, memory integrity check - reduces system-level validation effort for ISO 13849 PLd-certified designs. |
Pinout & Package
Package: 40-pin QFN (6 mm × 6 mm, 0.5 mm pitch), wettable flank, RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Primary power supply input | Accepts 1.8–5.5 V; powers digital core, AFE, and internal regulators - requires local 1 µF ceramic decoupling. |
| VSS | Ground reference | Digital and analog ground common point; must be connected to low-impedance PCB plane for <1 µV noise floor. |
| AIN1P / AIN1N | Differential input channel 1 | High-Z inputs for bridge/half-bridge sensors; support programmable biasing and PGA gain (1× to 128×). |
| AIN2P / AIN2N | Differential input channel 2 | Independent second AFE path - enables dual-sensor fusion (e.g., pressure + temperature) without multiplexing latency. |
| AOUT | Analog output driver | Class-AB buffered output capable of driving 0–10 V into 2 kΩ or 4–20 mA into 500 Ω - supports true 0 V output via internal negative rail generator. |
| SCL / SDA | I²C serial interface | Open-drain pins compatible with 1.8 V/3.3 V/5 V systems; support Fast+ mode (1 MHz) for rapid coefficient upload. |
| SCLK / MOSI / MISO / CS | SPI interface | Full-duplex 4-wire SPI with configurable polarity/phase; enables high-speed programming during production calibration. |
| OWI | One-wire interface | Single-pin bidirectional communication (100 kbit/s); simplifies wiring in space-constrained sensor housings. |
| EOC / ALARM | Event output pins | Configurable push-pull or open-drain outputs signaling end-of-conversion, out-of-range, or diagnostic fault conditions. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent AFE paths | Enables simultaneous acquisition from two resistive sensors (e.g., differential pressure + ambient temperature) with no cross-talk or timing conflict. |
| ARM Cortex-M3 math engine | Executes real-time sensor linearization, temperature compensation, and custom correction algorithms - eliminates host MCU computational load. |
| Reprogrammable 4 kB NVM | Stores full calibration coefficient sets (offset, gain, SOT, TCG) for both channels; supports field updates without hardware change. |
| True-0V analog output | Internal charge pump generates –1.5 V rail, enabling rail-to-rail 0–10 V output without external op-amps or negative supplies. |
| Multi-protocol digital interface | Single device supports I²C, SPI, and OWI - allows reuse across product families with differing host controller capabilities. |
| Comprehensive on-chip diagnostics | Validates sensor connection integrity, AFE functionality, and memory CRC - reduces need for external test fixtures in manufacturing. |
Applications
| Industrial Pressure Transmitters | Medical Blood Pressure Monitors |
|---|---|
|
Use Scenario: High-stability differential pressure measurement in HVAC ducts or process control loops with 4–20 mA output compliance. IC Role / Device Role / Timing Role: Dual AFE acquires primary bridge and reference temperature simultaneously; ARM core applies SOT Curve-1 compensation at 100 Hz update rate. Use Value: Achieves <±0.05% FS total error over –40°C to +125°C without external temperature sensors or lookup tables. |
Use Scenario: Cuff-based oscillometric blood pressure measurement requiring low-noise, ratiometric analog output to ADC. IC Role / Device Role / Timing Role: ZSSC3281BC8R conditions piezoresistive cuff sensor and internal PTAT; outputs 0–5 V ratiometric signal synchronized to pump cycle. Use Value: Enables Class IIa medical device certification by meeting IEC 60601-2-30 linearity and repeatability requirements. |
| Smart Weight Scales | Automotive Fuel Level Sensors |
|
Use Scenario: Consumer-grade bathroom scale with auto-zero, temperature drift correction, and Bluetooth LE connectivity. IC Role / Device Role / Timing Role: Single AFE channel reads load cell; second channel monitors thermistor; I²C interface feeds corrected 24-bit data to BLE SoC. Use Value: Delivers ±1 g resolution at 150 kg full scale with <0.02% FS drift from 10°C to 40°C ambient. |
Use Scenario: Fuel tank sender unit with resistive float arm and harsh environment operation (–40°C to +105°C). IC Role / Device Role / Timing Role: ZSSC3281BC8R interfaces with fuel-level potentiometer and external diode temperature sensor; outputs PWM-modulated analog signal. Use Value: Meets AEC-Q100 Grade 2 requirements via integrated diagnostics and extended voltage operation (7–48 V with JFET regulator). |
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 AFE, NVM calibration storage, and analog output drivers. | Targeted at motion sensing, not resistive bridge conditioning; no support for Pt100 or current-loop outputs. | Select only if motion + temperature fusion is required and external DAC/loop driver acceptable. |
| Analog Devices AD7798 | Single-channel 24-bit ΣΔ ADC with PGA; no embedded processor, no NVM, no analog output, no multi-sensor compensation. | Requires external microcontroller for calibration math and output generation - increases BOM and firmware complexity. | Choose when cost sensitivity outweighs performance and integration needs; not suitable for smart sensor modules. |
Compared with the AD7798 and ICM-42688-P, the ZSSC3281BC8R uniquely combines dual-channel AFE, ARM-based real-time correction, reprogrammable NVM, and integrated analog output drivers - reducing system component count by ≥4 ICs and eliminating host-side compensation firmware.
Availability
ZSSC3281BC8R is available at Aetrix Electronics and suitable for industrial pressure transmitters, medical blood pressure monitors, and smart weight scales requiring stable component supply, long-term calibration retention, and field-upgradable sensor compensation.
Supply support for ZSSC3281BC8R 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 SoC solutions for automotive, industrial, and IoT markets.
The ZSSC3281BC8R belongs to Renesas' Smart Sensor Signal Conditioning product line, engineered to replace discrete signal chains with fully integrated, programmable, and certified-ready sensor front ends for high-accuracy industrial and medical applications.
FAQ
What is the maximum sensor excitation current supported by the ZSSC3281BC8R?
The ZSSC3281BC8R provides programmable on-chip current sources up to 1.5 mA per channel, configurable in 0.1 mA steps. This enables direct excitation of low-power bridge sensors (e.g., 350 Ω or 1 kΩ) without external current drivers. The ZSSC3281BC8R also supports external voltage-source excitation for higher-power configurations.
Does the ZSSC3281BC8R support true 0 V output on its analog voltage output pin?
Yes, the ZSSC3281BC8R includes an integrated charge pump that generates a –1.5 V rail, allowing the AOUT pin to deliver true 0 V to 10 V absolute output without external negative supplies. This capability is confirmed in Section 8.3.3 of the official datasheet and enables rail-to-rail operation in single-supply systems.
Can the ZSSC3281BC8R perform temperature compensation using an external diode sensor?
Yes, the ZSSC3281BC8R supports up to three external temperature sensors, including forward-biased diodes. Its auxiliary measurement circuitry provides programmable bias current and dedicated ADC conversion for diode voltage reading, enabling accurate temperature compensation referenced to the sensor element itself - as documented in Sections 4.3.2 and 12.4 of the datasheet.
What is the role of the ARM Cortex-M3 core inside the ZSSC3281BC8R?
The embedded 32-bit ARM Cortex-M3 core executes the sensor signal conditioning algorithm - applying offset, gain, SOT Curve-0/1, TCG, and nonlinearity corrections in real time using coefficients stored in the device's 4 kB NVM. This offloads computation from the host system and enables autonomous, calibrated output generation - a defining feature of the ZSSC3281BC8R.
How does the ZSSC3281BC8R handle diagnostics for sensor disconnection or short-circuit faults?
The ZSSC3281BC8R performs automatic sensor connection diagnostics during startup and periodic runtime checks, detecting open-circuit and short-circuit conditions on AIN1P/AIN1N and AIN2P/AIN2N inputs. Diagnostic status is reported via dedicated registers (0x2A–0x32) and can trigger the ALARM pin - details are specified in Section 7.1 and Table 12.7 of the official datasheet.
ZSSC3281BC8R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- -
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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:
- -
- Supplier Device Package:
- -
ZSSC3281BC8R FAQ
1.How can I place an order for ZSSC3281BC8R through Aetrix?
Please submit a Request for Quotation (RFQ) for ZSSC3281BC8R 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 ZSSC3281BC8R reliable?
The price and inventory of ZSSC3281BC8R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZSSC3281BC8R is usually 5 days.
3.What payment methods are accepted for ZSSC3281BC8R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZSSC3281BC8R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZSSC3281BC8R?
ZSSC3281BC8R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZSSC3281BC8R 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 ZSSC3281BC8R?
For technical support, including ZSSC3281BC8R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZSSC3281BC8R requirements.
6.How does Aetrix verify that ZSSC3281BC8R is sourced from the original manufacturer or authorized distributors?
All ZSSC3281BC8R 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 ZSSC3281BC8R meets industry standards.
7.What is the process for return or replacement of ZSSC3281BC8R?
All ZSSC3281BC8R units undergo pre-shipment inspection (PSI). If there is an issue with ZSSC3281BC8R, 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 ZSSC3281BC8R part is unused and in its original packaging.
Return procedure for ZSSC3281BC8R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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