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Renesas ZSSC3123AI1B
- Part No.:
- ZSSC3123AI1B
- Manufacturer:
- Renesas
- Category:
- Sensor and Detector Interfaces
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- -
- Datasheet:
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ZSSC3123AI1B.pdf
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Product details
Overview
ZSSC3123AI1B from Renesas Electronics is a CMOS 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 single or differential capacitive sensors up to 260 pF, delivers ±0.25% FSO accuracy from –40°C to +125°C, and outputs corrected values via I²C, SPI, PDM, or dual alarm signals - enabling precision pressure, level, or proximity sensing in industrial and automotive systems.
For engineers reviewing the ZSSC3123AI1B datasheet, ZSSC3123AI1B pinout, ZSSC3123AI1B application, or ZSSC3123AI1B equivalent, key selection criteria include its 14-TSSOP package, programmable resolution (8–14 bit), sub-1μA sleep current, internal temperature reference, and support for one-pass digital calibration without laser trimming.
Technical Context
The ZSSC3123AI1B integrates a capacitance-to-digital converter (CDC) with configurable gain multipliers (Mult1–Mult8), supporting full-scale input ranges from 2 pF to 260 pF. Its digital signal processor applies piece-wise 1st/2nd-order or single-region 3rd-order correction using EEPROM-stored coefficients for both capacitance and temperature channels.
It features dual independent alarm outputs configurable as push-pull or open-drain, PDM outputs for ratiometric capacitance and temperature, and a Ready pin indicating measurement completion. The device operates across 2.3 V–5.5 V supply and supports update rates from 55 Hz (8-bit) down to 1.5 Hz (14-bit) with corresponding conversion times of 0.7 ms to 18.5 ms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.3 V to 5.5 V - enables direct interface with 3.3 V and 5 V microcontrollers and battery-powered systems. |
| Capacitance Range | Up to 260 pF - supports wide variety of MEMS, PCB-based, and ceramic capacitive sensors without external scaling. |
| Accuracy | ±0.25% FSO at –40°C to +125°C - specified over full automotive temperature range with supply variation ±10%. |
| Resolution & Speed | 8–14 bit; 0.7 ms (8-bit) to 18.5 ms (14-bit) - trade-off between update rate and noise performance selectable per application. |
| Sleep Current | ≤1 μA at 85°C - enables multi-year operation in battery-critical applications such as IoT environmental monitors. |
| Interface Options | I²C, SPI, PDM, and dual alarm outputs - provides flexible host integration without requiring external ADC or signal conditioning. |
| Temperature Compensation | 1st & 2nd order digital gain/offset drift correction - eliminates need for external temperature sensor or analog compensation circuitry. |
Pinout & Package
Package: 4.4 mm × 5.0 mm 14-pin TSSOP (JEDEC MO-153), lead-free, RoHS-compliant. Pinout validated per Renesas ZSSC3123 Datasheet Rev. Nov 2021, Page 7 (Figure 1 and Table 1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Supply voltage input | Primary power rail (2.3–5.5 V); requires local 0.1 μF decoupling to GND. |
| VSS | Ground reference | Digital and analog ground common node; must be low-impedance connection. |
| C0 / C1 | Capacitive sensor inputs | C0 = primary sensor terminal; C1 = optional second terminal for differential mode or reference. |
| CC | Reference capacitor connection | Connects external reference capacitor (typically 10–100 pF) for CDC ratio-metric stability. |
| SCL/SCLK | Clock input for I²C/SPI | Shared pin: I²C SCL or SPI SCLK depending on interface configuration. |
| SDA/MISO | Data I/O for I²C / SPI output | Bi-directional I²C data line or unidirectional SPI MISO; configured at power-up. |
| SS | SPI slave select | Active-low enable for SPI communication; high-impedance when not selected. |
| Alarm_High / Alarm_Low | Programmable alarm outputs | Configurable as push-pull or open-drain; each can trigger independently on capacitance or temperature thresholds. |
| Ready/PDM_C | Measurement status / PDM output | Active-low ready signal or pulse-density modulated capacitance output - function selected via EEPROM. |
| PDM_T | Temperature PDM output | Ratiometric pulse-density output proportional to measured temperature; usable with simple RC filter. |
| Vcore | Internal core regulator output | Not user-connected; supplies regulated voltage to internal analog/digital blocks. |
| GND (pin 14) | Thermal pad / ground | Exposed thermal pad tied to VSS; improves thermal performance and EMI immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Digital sensor compensation | On-chip DSP applies piece-wise linear or 3rd-order polynomial correction using EEPROM-stored coefficients - eliminates analog trimming and factory calibration hardware. |
| Integrated temperature reference | On-die temperature sensor with <0.5°C nonlinearity - removes need for external thermistor or RTD in compensated systems. |
| One-pass digital calibration | I²C interface enables full calibration (offset, sensitivity, temp drift) in a single PC-controlled session - reduces production test time and cost. |
| Low-power operation | 750 μA typical active current and ≤1 μA sleep current - supports always-on sensing in energy-constrained edge devices. |
| Flexible output architecture | Simultaneous I²C/SPI data reads plus PDM ratiometric outputs and dual alarms - allows hybrid digital/analog system integration without additional converters. |
Applications
| Industrial Pressure Sensing | Automotive HVAC Humidity Control |
|---|---|
Use Scenario: Monitoring diaphragm deflection in stainless-steel pressure transducers for hydraulic and pneumatic control systems. IC Role / Device Role / Timing Role: Capacitance-to-digital signal conditioner performing real-time offset/sensitivity/temperature compensation and delivering calibrated digital output. Use Value: Achieves ±0.25% FSO accuracy over –40°C to +125°C without external temperature sensing or analog compensation components. |
Use Scenario: Measuring relative humidity via polymer capacitive sensor in vehicle cabin air handling units. IC Role / Device Role / Timing Role: Signal conditioner acquiring and correcting capacitance changes due to moisture absorption, with integrated temperature compensation. Use Value: Enables single-chip humidity measurement with <1% RH error across full automotive temperature range using only digital calibration. |
| Medical Disposable Flow Sensors | Consumer Appliance Liquid Level Detection |
Use Scenario: Detecting fluid flow rate in disposable IV drip sets using differential capacitive sensing across microfluidic channels. IC Role / Device Role / Timing Role: High-resolution (14-bit) capacitance measurement with fast 18.5 ms conversion and low-noise PDM output for analog-compatible interfaces. Use Value: Supports battery-powered, single-use medical devices with >5-year shelf life due to ≤1 μA sleep current and no external passive trimming. |
Use Scenario: Non-contact liquid level detection in washing machines and dishwashers using PCB-patterned capacitive electrodes. IC Role / Device Role / Timing Role: Robust signal conditioner rejecting EMI and water condensation effects through digital correlation and dual-alarm thresholding. Use Value: Eliminates mechanical float switches and enables precise fill-level control with programmable high/low alarms driving pump logic directly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar capacitive sensor signal conditioning applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDK InvenSense ICM-42688-P | MEMS IMU with integrated capacitive pressure channel; lacks dedicated CDC architecture, EEPROM-based compensation, or PDM outputs. | Targeted at motion + pressure fusion; not optimized for standalone high-accuracy capacitive sensing or industrial calibration workflows. | Choose only if motion sensing is required alongside pressure; otherwise ZSSC3123AI1B offers superior capacitance-specific accuracy and calibration flexibility. |
| Analog Devices AD7745 | 24-bit CDC with lower max input capacitance (17 pF), no on-chip temperature compensation algorithm, and no EEPROM storage for coefficients. | Requires external MCU for temperature compensation math and calibration coefficient management; higher BOM and firmware overhead. | Select AD7745 only for ultra-high-resolution (<0.1 pF) single-point measurements where temperature drift is externally managed. |
Compared with ICM-42688-P and AD7745, the ZSSC3123AI1B uniquely integrates sensor-specific correction algorithms, non-volatile coefficient storage, and dual alarm/PDM outputs - reducing system-level design effort and enabling true plug-and-calibrate deployment in harsh environments.
Availability
ZSSC3123AI1B is available at Aetrix Electronics and suitable for industrial pressure monitoring, automotive HVAC control, medical flow sensing, and consumer appliance level detection requiring stable component supply, long-term lifecycle support, and guaranteed calibration traceability.
Supply support for ZSSC3123AI1B 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 signal conditioning solutions for industrial, automotive, and IoT applications.
The ZSSC3123AI1B belongs to Renesas' cLite™ family of highly integrated capacitive sensor conditioners, designed specifically to replace analog front-ends and reduce calibration complexity in high-reliability capacitive sensing systems.
FAQ
What is the maximum sensor capacitance supported by the ZSSC3123AI1B?
The ZSSC3123AI1B supports capacitive sensors up to 260 pF, achieved using the Mult8 gain setting. This enables compatibility with large-area PCB electrodes, MEMS diaphragms, and ceramic sensors without external scaling networks. The device automatically selects optimal CDC multiplier based on configuration settings stored in EEPROM.
Does the ZSSC3123AI1B require an external temperature sensor for compensation?
No, the ZSSC3123AI1B includes an on-die temperature sensor with <0.5°C nonlinearity and performs full 1st- and 2nd-order digital compensation of both capacitance offset and sensitivity drift. No external thermistor, RTD, or temperature IC is needed - all temperature-related correction is handled internally using coefficients stored in EEPROM.
Can the ZSSC3123AI1B operate in battery-powered applications with multi-year runtime?
Yes, the ZSSC3123AI1B draws ≤1 μA in Sleep Mode at 85°C and supports programmable update intervals. Combined with its ability to perform one-pass digital calibration and eliminate laser trimming, it enables maintenance-free operation in sealed battery-powered devices such as wireless environmental monitors and disposable medical sensors.
How is calibration performed for the ZSSC3123AI1B?
Calibration of the ZSSC3123AI1B is performed via its I²C interface using Renesas-provided software tools. A PC or MCU applies known sensor stimuli (e.g., pressure points, temperature setpoints), and the ZSSC3123AI1B computes and stores correction coefficients directly into its on-chip EEPROM - eliminating manual trimming, external DACs, or iterative analog adjustments.
What output formats does the ZSSC3123AI1B support besides I²C and SPI?
In addition to I²C and SPI, the ZSSC3123AI1B provides two pulse density modulation (PDM) outputs: PDM_C for ratiometric capacitance and PDM_T for temperature. These outputs can be filtered with a simple RC network to generate analog-like signals compatible with legacy microcontrollers lacking dedicated ADC resources for high-resolution capacitive data.
ZSSC3123AI1B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- -
- Series:
- *
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Supply:
- -
- Operating Temperature:
- -
- Grade:
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- Qualification:
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- Mounting Type:
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ZSSC3123AI1B FAQ
1.How can I place an order for ZSSC3123AI1B through Aetrix?
Please submit a Request for Quotation (RFQ) for ZSSC3123AI1B 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 ZSSC3123AI1B reliable?
The price and inventory of ZSSC3123AI1B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZSSC3123AI1B is usually 5 days.
3.What payment methods are accepted for ZSSC3123AI1B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZSSC3123AI1B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZSSC3123AI1B?
ZSSC3123AI1B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZSSC3123AI1B 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 ZSSC3123AI1B?
For technical support, including ZSSC3123AI1B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZSSC3123AI1B requirements.
6.How does Aetrix verify that ZSSC3123AI1B is sourced from the original manufacturer or authorized distributors?
All ZSSC3123AI1B 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 ZSSC3123AI1B meets industry standards.
7.What is the process for return or replacement of ZSSC3123AI1B?
All ZSSC3123AI1B units undergo pre-shipment inspection (PSI). If there is an issue with ZSSC3123AI1B, 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 ZSSC3123AI1B part is unused and in its original packaging.
Return procedure for ZSSC3123AI1B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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