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Renesas ZSSC3123AA2T
- Part No.:
- ZSSC3123AA2T
- Manufacturer:
- Renesas
- Category:
- Specialized
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ZSSC3123AA2T.pdf
- Description:
- IC INTFACE SPECIALIZED SGNL COND
- Quantity:
- Payment:
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Product details
Overview
ZSSC3123AA2T 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 sensor capacitances up to 260 pF, offers resolution from 8-bit to 14-bit (conversion times 0.7 ms to 18.5 ms), and delivers ±0.25% FSO accuracy across –40°C to +125°C - used in industrial pressure, level, and proximity sensing systems.
For engineers reviewing the ZSSC3123AA2T datasheet, ZSSC3123AA2T pinout, ZSSC3123AA2T application, or ZSSC3123AA2T equivalent, key selection considerations include its dual-capacitance input architecture, programmable PDM/alarms/I²C/SPI output modes, low-power sleep current (≤1 μA), and EEPROM-based one-pass digital calibration eliminating laser trimming.
Technical Context
The ZSSC3123AA2T integrates a capacitance-to-digital converter (CDC) with configurable multiplier settings (Mult1–Mult8) to match sensor full-scale ranges from 2 pF to 260 pF, and includes an on-die temperature sensor for simultaneous thermal measurement. Its digital signal processor executes piece-wise 1st/2nd-order or single-region 3rd-order correction algorithms using coefficients stored in on-chip EEPROM.
It operates from 2.3 V to 5.5 V, supports both single-ended (C₀/CC) and differential (C₀/C₁) capacitive inputs, and provides four output modalities: I²C, SPI, pulse density modulation (PDM) for ratiometric analog-like outputs, and two independent alarm pins configurable as push-pull or open-drain switches.
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. |
| Capacitance Range | Up to 260 pF - supports wide variety of MEMS, PCB, and ceramic capacitive sensors without external scaling. |
| Resolution & Speed | 8-bit @ 0.7 ms, 14-bit @ 18.5 ms - trade-off between update rate and precision selectable per application timing budget. |
| 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. |
| Current Consumption | 750 μA typical active, ≤1 μA sleep at 85°C - suitable for battery-powered IoT nodes requiring multi-year operation. |
| Output Interfaces | I²C, SPI, PDM (capacitance & temperature), dual alarms - eliminates need for external ADC or signal conditioning circuitry. |
| Temperature Compensation | Digital 1st/2nd-order gain/offset drift correction using internal reference - no external thermistor or calibration hardware required. |
Pinout & Package
Package: 14-pin TSSOP (4.4 mm × 5.0 mm), RoHS-compliant, surface-mount.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Primary supply rail (2.3–5.5 V); decoupled with 0.1 μF capacitor to VSS. |
| VSS | Ground reference | Analog/digital common ground; must be low-impedance return path for CDC and temp sensor. |
| C0 | Capacitive sensor input | Primary sensor terminal for single-ended or differential (with C1) configurations. |
| CC | Reference capacitor input | Connects external reference capacitor (typically 1–100 pF) for CDC ratio-metric operation. |
| C1 | Differential sensor input | Second sensor terminal enabling noise-rejecting differential capacitance measurement. |
| SCL/SCLK | Clock input | I²C clock (SCL) or SPI clock (SCLK); shared pin with mode-select logic. |
| SDA/MISO | Data I/O | I²C bidirectional data (SDA) or SPI master-in/slave-out (MISO); function determined by SS state. |
| SS | SPI chip select | Active-low enable for SPI mode; high = I²C mode, low = SPI mode. |
| Ready/PDM_C | Status or PDM output | Indicates measurement completion (Ready) or outputs capacitance as PDM stream (PDM_C). |
| Alarm_High | Programmable alarm output | Configurable push-pull or open-drain output asserting when measured value exceeds high threshold. |
| Alarm_Low | Programmable alarm output | Configurable push-pull or open-drain output asserting when measured value falls below low threshold. |
| Vcore | Internal core voltage | Internally regulated ~1.2 V supply; requires 0.1 μF decoupling to VSS. |
| NC | No connect | Pin 13 is unconnected; must be left floating or tied to VSS per layout guidelines. |
| NC | No connect | Pin 14 is unconnected; must be left floating or tied to VSS per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Digital sensor compensation | On-chip DSP applies user-programmed 1st/2nd-order piecewise or 3rd-order single-region correction to raw capacitance data - removes need for external linearization circuitry. |
| Integrated temperature reference | On-die temperature sensor with <±0.5°C nonlinearity enables fully self-contained thermal compensation - no external thermistor or calibration points required. |
| One-pass digital calibration | I²C interface allows full sensor-specific coefficient programming in a single PC-controlled session - eliminates costly laser trimming and reduces production test time. |
| Multi-output flexibility | Single device supports digital (I²C/SPI), ratiometric analog-like (PDM), and discrete control (dual alarms) outputs - simplifies system architecture across sensing, monitoring, and actuation layers. |
| Chip-on-board optimized layout | Die-level footprint and bond pad arrangement support direct die-die bonding with capacitive sensor dies - enables ultra-compact, low-cost COB modules for space-constrained applications. |
Applications
| Industrial Pressure Transducers | Automotive HVAC Humidity Sensors |
|---|---|
Use Scenario: MEMS-based pressure transducer in hydraulic or pneumatic control systems where long-term stability and thermal robustness are critical. IC Role / Device Role / Timing Role: Primary signal conditioner converting diaphragm capacitance shifts into calibrated digital pressure values with temperature-compensated output. Use Value: Achieves ±0.25% FSO accuracy over –40°C to +125°C using on-chip 2nd-order temperature drift correction - avoids field recalibration and extends service intervals. | Use Scenario: Capacitive polymer humidity sensor in automotive cabin air management systems requiring low power and high reliability. IC Role / Device Role / Timing Role: Front-end conditioner acquiring and compensating RH-dependent capacitance while delivering PDM or I²C output to vehicle MCU. Use Value: Sleep current ≤1 μA enables always-on monitoring without draining 12 V battery; integrated temp sensor eliminates separate NTC component. |
| Consumer Appliance Touch Controls | Medical Disposable Fluid Level Sensors |
Use Scenario: Waterproof touch-sensitive panels in washing machines or dishwashers exposed to condensation and detergent vapors. IC Role / Device Role / Timing Role: Capacitance-to-digital interface detecting finger proximity through glass/plastic overlay with adaptive baseline tracking. Use Value: Programmable offset/sensitivity and 14-bit resolution allow fine-tuning for varying overlay thicknesses and environmental drift - improves false-trigger immunity. | Use Scenario: Single-use IV bag or dialysis cartridge with printed capacitive electrodes measuring fluid volume via dielectric change. IC Role / Device Role / Timing Role: Low-cost, calibrated signal conditioner embedded in disposable module providing alarm-driven empty/full indication. Use Value: Dual push-pull alarms directly drive LEDs or optocouplers without external drivers; EEPROM stores unique calibration per unit - ensures batch traceability. |
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 sensing front-end; lacks dedicated EEPROM-based multi-order compensation engine and PDM output. | Targeted at motion + capacitance fusion (e.g., gesture + orientation); not optimized for high-accuracy static capacitance measurement. | Select ZSSC3123AA2T when primary requirement is precision capacitive transduction with deterministic thermal compensation - not motion sensing. |
| Analog Devices AD7745 | 24-bit CDC with 12-bit temperature channel; no on-chip DSP for sensor-specific polynomial correction; requires external microcontroller for calibration math. | Requires host MCU to store and apply calibration coefficients - increases firmware complexity and BOM count. | Choose ZSSC3123AA2T for autonomous, self-contained calibration and output - reduces system-level development effort and validation scope. |
Compared with ICM-42688-P and AD7745, the ZSSC3123AA2T uniquely integrates EEPROM-stored, sensor-specific correction algorithms and dual-alarm outputs in a compact TSSOP package - enabling drop-in replacement in cost-sensitive, high-volume capacitive sensing modules where calibration autonomy and output flexibility are design priorities.
Availability
ZSSC3123AA2T is available at Aetrix Electronics and suitable for industrial pressure transducers, automotive HVAC sensors, and consumer appliance touch controls requiring stable component supply, guaranteed long-term availability, and full traceability from wafer lot to shipment.
Supply support for ZSSC3123AA2T 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 delivering microcontrollers, analog, power, and SoC solutions for automotive, industrial, infrastructure, and IoT applications - headquartered in Tokyo, Japan.
The ZSSC3123AA2T belongs to Renesas' cLite™ family of highly integrated capacitive signal conditioners, designed specifically for cost-sensitive, high-volume capacitive sensing applications demanding factory-calibrated accuracy, minimal external components, and flexible digital/analog alarm outputs.
FAQ
What is the maximum sensor capacitance supported by the ZSSC3123AA2T?
The ZSSC3123AA2T supports sensor capacitances up to 260 pF when configured with the Mult8 setting. This is achieved via internal programmable CDC multiplier scaling, allowing direct interface with large-area or high-dielectric-constant capacitive elements without external amplification or range-switching circuitry. The device maintains specified accuracy and linearity across this full range when calibrated per datasheet procedures.
Does the ZSSC3123AA2T require external components for temperature compensation?
No, the ZSSC3123AA2T does not require external components for temperature compensation. It integrates a precision on-die temperature sensor and executes digital 1st- and 2nd-order gain/offset drift correction using coefficients stored in on-chip EEPROM. This eliminates the need for external thermistors, RTDs, or calibration hardware - reducing BOM count and layout complexity.
Can the ZSSC3123AA2T operate in differential capacitance mode?
Yes, the ZSSC3123AA2T supports differential capacitance measurement using C₀ and C₁ inputs. This configuration rejects common-mode noise and improves immunity to parasitic capacitance variations - ideal for applications like MEMS accelerometers or high-precision level sensors. The internal CDC processes the difference (C₀ − C₁) with the same resolution and compensation capabilities as single-ended mode.
What output formats does the ZSSC3123AA2T provide?
The ZSSC3123AA2T provides four output formats: I²C and SPI for digital register access, pulse density modulation (PDM) for ratiometric analog-like outputs of both capacitance and temperature, and two independent alarm pins (Alarm_High and Alarm_Low) configurable as push-pull or open-drain switches. This multi-modal capability allows direct integration into diverse host architectures without additional interface ICs.
How is calibration performed for the ZSSC3123AA2T?
Calibration of the ZSSC3123AA2T is performed digitally via its I²C interface using a PC-connected evaluation kit. A set of sensor-specific correction coefficients - for offset, sensitivity, and temperature drift - is computed offline and written once to on-chip EEPROM. After programming, the ZSSC3123AA2T autonomously applies these corrections during operation, enabling true one-pass calibration without laser trimming or manual adjustment.
ZSSC3123AA2T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- RBicLite™
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Applications:
- Sensor Signal Conditioner - Resistive
- Interface:
- I2C, SPI
- Voltage - Supply:
- 2.3V ~ 5.5V
- Supplier Device Package:
- 14-TSSOP
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
ZSSC3123AA2T FAQ
1.How can I place an order for ZSSC3123AA2T through Aetrix?
Please submit a Request for Quotation (RFQ) for ZSSC3123AA2T 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 ZSSC3123AA2T reliable?
The price and inventory of ZSSC3123AA2T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZSSC3123AA2T is usually 5 days.
3.What payment methods are accepted for ZSSC3123AA2T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZSSC3123AA2T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZSSC3123AA2T?
ZSSC3123AA2T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZSSC3123AA2T 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 ZSSC3123AA2T?
For technical support, including ZSSC3123AA2T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZSSC3123AA2T requirements.
6.How does Aetrix verify that ZSSC3123AA2T is sourced from the original manufacturer or authorized distributors?
All ZSSC3123AA2T 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 ZSSC3123AA2T meets industry standards.
7.What is the process for return or replacement of ZSSC3123AA2T?
All ZSSC3123AA2T units undergo pre-shipment inspection (PSI). If there is an issue with ZSSC3123AA2T, 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 ZSSC3123AA2T part is unused and in its original packaging.
Return procedure for ZSSC3123AA2T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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