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Renesas ZSSC3123AA8B
- Part No.:
- ZSSC3123AA8B
- Manufacturer:
- Renesas
- Category:
- Sensor and Detector Interfaces
- Package:
- Die
- Datasheet:
-
ZSSC3123AA8B.pdf
- Description:
- OPN - WAFER (UNSAWN) - BOX
- Quantity:
- Payment:
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Product details
Overview
ZSSC3123AA8B from Renesas Electronics is a CMOS capacitive sensor signal conditioner IC that performs high-accuracy capacitance-to-digital conversion and digital compensation of sensor offset, sensitivity, and temperature drift using on-chip EEPROM-stored calibration coefficients. It supports single or differential capacitive sensors up to 260 pF, offers I²C/SPI/PDM outputs, and delivers ±0.25% FSO accuracy from –40°C to +125°C in industrial pressure and level sensing systems.
For engineers reviewing the ZSSC3123AA8B datasheet, ZSSC3123AA8B pinout, ZSSC3123AA8B application, or ZSSC3123AA8B equivalent, key selection considerations include its 14-TSSOP package, programmable resolution (8–14 bit), dual alarm outputs with push-pull/open-drain configuration, PDM ratiometric analog output capability, and ultra-low sleep current (≤1 μA at 85°C).
Technical Context
The ZSSC3123AA8B integrates a capacitance-to-digital converter (CDC) with configurable multiplier settings (Mult1–Mult8) enabling full-scale input ranges from 2 pF to 260 pF, and a dedicated on-die temperature sensor for simultaneous dual-parameter measurement. Its digital signal processor applies piece-wise 1st/2nd-order or single-region 3rd-order compensation algorithms to both capacitance and temperature data.
Calibration coefficients are stored in non-volatile EEPROM and applied in real time during operation; no external trimming is required. The device operates across 2.3 V–5.5 V supply, supports update rates from 54 Hz (8-bit) down to 1.4 Hz (14-bit), and features configurable I²C/SPI timing with dedicated Ready and alarm pins for deterministic system synchronization.
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 without level-shifting. |
| Input Capacitance Range | Up to 260 pF - supports wide variety of MEMS, ceramic, and polymer-based capacitive sensors. |
| Resolution & Conversion Time | 8-bit @ 0.7 ms, 14-bit @ 18.5 ms - selectable trade-off between speed and precision per application need. |
| Accuracy | ±0.25% FSO over –40°C to +125°C at 3 V/5 V, VSUPPLY ±10% - specified under defined operating conditions for industrial-grade repeatability. |
| Temperature Compensation | Digital 1st/2nd-order gain and offset drift correction - eliminates need for external thermistors or analog compensation circuitry. |
| Output Interfaces | I²C, SPI, PDM (capacitance & temperature), dual alarms - provides flexible host connectivity and analog-ratiometric output without ADC. |
| Quiescent Current | 750 μA typical active, ≤1 μA sleep at 85°C - suitable for battery-powered IoT and portable instrumentation. |
Pinout & Package
Package: 4.4 mm × 5.0 mm 14-pin TSSOP (RoHS-compliant, lead-free, moisture-sensitive level 3).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Primary 2.3–5.5 V supply rail; requires local 0.1 μF decoupling. |
| VSS | Ground reference | Analog/digital common ground; must be low-impedance return path. |
| C0 / C1 | Capacitive sensor inputs | Differential or single-ended sensor terminals; C1 optional for differential mode. |
| CC | Reference capacitor connection | Connects external reference cap (typically 10–100 pF) for CDC ratio-metric stability. |
| SCL/SCLK | Clock input for I²C/SPI | Configurable as I²C SCL or SPI SCLK; internal pull-up not provided. |
| SDA/MISO | Data I/O for I²C / MISO for SPI | Bidirectional I²C data line or SPI master-in/slave-out; open-drain compatible. |
| SS | SPI slave select | Active-low chip select for SPI communication only; ignored in I²C mode. |
| Ready/PDM_C | Measurement ready flag / PDM capacitance output | Asserts after conversion complete; doubles as pulse-density modulated capacitance output. |
| Alarm_High | Programmable high-threshold alarm | Push-pull or open-drain output; configurable polarity and latching behavior. |
| Alarm_Low | Programmable low-threshold alarm | Independent of Alarm_High; supports bang-bang control or fault detection. |
| PDM_T | Pulse-density modulated temperature output | Ratiometric PDM output synchronized with PDM_C; enables analog temperature readout without ADC. |
| Vcore | Internal core voltage supply | Internally regulated ~1.2 V; requires external 0.1 μF bypass capacitor. |
| NC | No connect | Pin 13 is unconnected; must be left floating or tied to GND per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Digital sensor compensation | On-the-fly 1st/2nd-order piecewise or 3rd-order single-region correction of capacitance and temperature - removes need for analog front-end trimming. |
| Integrated temperature reference | On-die temperature sensor with <±0.5°C nonlinearity - eliminates external thermal sensing components and PCB routing complexity. |
| One-pass digital calibration | I²C-based PC-controlled coefficient programming into on-chip EEPROM - reduces calibration labor and eliminates laser trimming cost. |
| Low-power sleep mode | ≤1 μA current draw at 85°C with wake-on-alarm or bus activity - extends battery life in wireless sensor nodes. |
| Flexible output architecture | Simultaneous digital (I²C/SPI) and ratiometric analog (PDM_C/PDM_T) outputs - supports mixed-signal system architectures without external converters. |
Applications
| Industrial Pressure Sensing | Automotive HVAC Humidity Control |
|---|---|
Use Scenario: MEMS capacitive pressure transducer in industrial process monitoring with wide temperature variation (–40°C to +125°C). IC Role / Device Role / Timing Role: Primary signal conditioner performing capacitance-to-digital conversion, temperature-compensated linearization, and alarm-triggered overpressure reporting. Use Value: Achieves ±0.25% FSO accuracy without external compensation components, reducing BOM count and calibration steps. | Use Scenario: Polymer-based capacitive humidity sensor in automotive cabin air control systems requiring low power and high reliability. IC Role / Device Role / Timing Role: Dual-output conditioner delivering PDM humidity and temperature signals to MCU while maintaining ≤1 μA sleep current between readings. Use Value: Enables battery-backed or energy-harvested operation with ratiometric PDM eliminating need for precision ADC and reference voltage. |
| Medical Disposable Flow Sensors | Smart Appliance Liquid Level Detection |
Use Scenario: Single-use capacitive flow sensor in infusion pumps where calibration must be performed once during manufacturing and retained over lifetime. IC Role / Device Role / Timing Role: Digitally mated sensor signal conditioner storing calibrated coefficients in on-chip EEPROM for permanent, tamper-resistant calibration. Use Value: Eliminates post-assembly trimming and ensures consistent performance across production batches and shelf life. | Use Scenario: Low-cost capacitive tank-level sensor in washing machines or coffee makers with variable fill heights and detergent exposure. IC Role / Device Role / Timing Role: Robust signal conditioner supporting differential input to reject common-mode noise from motor EMI and water conductivity shifts. Use Value: Maintains stable measurement despite environmental contamination due to differential topology and digital offset/sensitivity correction. |
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 | Combines 6-axis IMU with integrated capacitive interface; lacks dedicated EEPROM-based multi-order sensor compensation and PDM analog outputs. | Targeted at motion + capacitance fusion (e.g., touch + gesture); not optimized for high-accuracy static capacitance measurement. | Select ZSSC3123AA8B when primary requirement is precision capacitive sensing with factory-calibrated digital compensation and analog-ratiometric outputs. |
| Analog Devices AD7745 | 24-bit CDC with 12-bit temperature sensor; no on-chip DSP for multi-order compensation, no PDM output, no EEPROM storage for coefficients. | Requires external MCU for calibration math and coefficient management; better suited for lab-grade benchtop instruments than embedded OEM systems. | Select ZSSC3123AA8B when system-level integration, reduced firmware burden, and self-contained calibration are critical for mass production. |
Compared with ICM-42688-P and AD7745, the ZSSC3123AA8B uniquely integrates EEPROM-stored multi-order compensation, dual PDM analog outputs, and ultra-low sleep current - enabling compact, calibrated, and battery-efficient capacitive sensing without external computation or analog support components.
Availability
ZSSC3123AA8B is available at Aetrix Electronics and suitable for industrial pressure sensing, automotive HVAC control, medical disposable flow monitoring, and smart appliance liquid level detection requiring stable component supply, long-term calibration retention, and RoHS-compliant packaging.
Supply support for ZSSC3123AA8B 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 applications.
The ZSSC3123AA8B belongs to Renesas' cLite™ family of highly integrated capacitive signal conditioners, designed specifically for cost-sensitive, high-volume OEM applications requiring factory-calibrated, maintenance-free capacitive sensing with minimal external components.
FAQ
What is the primary function of the ZSSC3123AA8B in a capacitive sensing system?
The ZSSC3123AA8B serves as a fully integrated capacitive sensor signal conditioner that converts raw sensor capacitance into calibrated digital values while compensating for offset, sensitivity, and temperature drift using on-chip EEPROM-stored coefficients. It eliminates the need for external trimming or analog compensation circuits, making it ideal for production-ready capacitive sensing designs where repeatability and long-term stability are critical. The ZSSC3123AA8B handles both single-ended and differential capacitive inputs up to 260 pF.
Does the ZSSC3123AA8B require an external temperature sensor?
No, the ZSSC3123AA8B includes an integrated on-die temperature sensor with ±0.5°C nonlinearity, enabling simultaneous capacitance and temperature measurement without external components. This internal reference supports digital 1st- and 2nd-order temperature compensation of sensor gain and offset drift, which is applied in real time by the on-chip DSP. The ZSSC3123AA8B uses this data to correct capacitance readings across –40°C to +125°C, ensuring accuracy without added BOM cost or layout complexity.
How is calibration performed for the ZSSC3123AA8B?
Calibration for the ZSSC3123AA8B is performed digitally via I²C using a PC-connected evaluation kit or host MCU, writing sensor-specific correction coefficients into its on-chip EEPROM. This one-pass procedure replaces laser trimming or analog potentiometer adjustment, reducing calibration time and cost. The ZSSC3123AA8B retains these coefficients permanently and applies them automatically during operation. Calibration data includes piece-wise or single-region polynomial terms for capacitance and temperature compensation, all managed internally without firmware intervention.
What output formats does the ZSSC3123AA8B support?
The ZSSC3123AA8B supports four concurrent output formats: I²C, SPI, pulse density modulation (PDM) for capacitance (PDM_C), and PDM for temperature (PDM_T). It also provides two programmable alarm outputs (Alarm_High and Alarm_Low) configurable as push-pull or open-drain. The PDM outputs deliver ratiometric analog-equivalent signals compatible with simple RC filtering, eliminating the need for external ADCs. The ZSSC3123AA8B does not support PWM or analog voltage outputs.
Is the ZSSC3123AA8B suitable for battery-powered applications?
Yes, the ZSSC3123AA8B is explicitly optimized for low-power operation: typical active current is 750 μA, and sleep mode current is ≤1 μA at 85°C. Its configurable update rates (54 Hz down to 1.4 Hz) and wake-on-alarm capability enable duty-cycled operation in battery-powered IoT nodes and portable devices. The ZSSC3123AA8B maintains full functionality-including PDM output and alarm generation-during low-power states, making it well-suited for energy-constrained applications like wireless sensor networks and wearable medical monitors.
ZSSC3123AA8B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- Die
- Series:
- cLite™
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- -
- Type:
- Capacitive Sensor
- Input Type:
- Capacitive
- Output Type:
- I2C, SPI
- Current - Supply:
- 1.1 mA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Die
ZSSC3123AA8B FAQ
1.How can I place an order for ZSSC3123AA8B through Aetrix?
Please submit a Request for Quotation (RFQ) for ZSSC3123AA8B 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 ZSSC3123AA8B reliable?
The price and inventory of ZSSC3123AA8B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZSSC3123AA8B is usually 5 days.
3.What payment methods are accepted for ZSSC3123AA8B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZSSC3123AA8B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZSSC3123AA8B?
ZSSC3123AA8B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZSSC3123AA8B 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 ZSSC3123AA8B?
For technical support, including ZSSC3123AA8B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZSSC3123AA8B requirements.
6.How does Aetrix verify that ZSSC3123AA8B is sourced from the original manufacturer or authorized distributors?
All ZSSC3123AA8B 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 ZSSC3123AA8B meets industry standards.
7.What is the process for return or replacement of ZSSC3123AA8B?
All ZSSC3123AA8B units undergo pre-shipment inspection (PSI). If there is an issue with ZSSC3123AA8B, 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 ZSSC3123AA8B part is unused and in its original packaging.
Return procedure for ZSSC3123AA8B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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