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Renesas ZSSC3123AI7R
- Part No.:
- ZSSC3123AI7R
- Manufacturer:
- Renesas
- Category:
- Sensor and Detector Interfaces
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ZSSC3123AI7R.pdf
- Description:
- TSSOP / 14 / 4,4MM G1 - TAPE&REE
- Quantity:
- Payment:
- Shipping:
Inventory:2,132
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Product details
Overview
ZSSC3123AI7R from Renesas Electronics is a CMOS capacitive sensor signal conditioner IC that performs high-accuracy capacitance-to-digital conversion and digital correction of offset, sensitivity, and temperature drift using on-chip DSP and EEPROM-stored calibration coefficients. It supports single or differential capacitive sensors up to 260 pF, offers I²C/SPI/PDM output, and operates from 2.3 V to 5.5 V across –40°C to +125°C - deployed in industrial pressure, level, and proximity sensing systems.
For engineers reviewing the ZSSC3123AI7R datasheet, ZSSC3123AI7R pinout, ZSSC3123AI7R application, or ZSSC3123AI7R equivalent, key selection criteria include configurable resolution (8–14 bit), programmable alarm outputs, internal temperature reference, ≤1 μA sleep current, and die or 14-TSSOP packaging for chip-on-board integration.
Technical Context
The ZSSC3123AI7R integrates a capacitance-to-digital converter (CDC) with selectable gain multipliers (Mult1–Mult8), supporting full-scale input ranges from 2 pF to 260 pF. Its digital core executes piece-wise 1st/2nd-order or single-region 3rd-order sensor compensation and 1st/2nd-order temperature gain/offset drift correction using coefficients stored in on-chip EEPROM.
It features dual analog front ends: one for capacitance measurement and one for integrated temperature sensing. Output modes include I²C (up to 400 kHz), SPI (mode 0/3), pulse density modulation (PDM) for ratiometric analog-like signals, and two configurable alarm pins capable of push-pull or open-drain operation.
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. |
| Max Input Capacitance | 260 pF - supports wide-range MEMS and PCB-based capacitive sensors including differential configurations. |
| Resolution & Conversion Time | 8-bit @ 0.7 ms, 10-bit @ 1.6 ms, 12-bit @ 5.0 ms, 14-bit @ 18.5 ms - trade-off between speed and precision per application timing budget. |
| Accuracy | ±0.25% FSO over –40°C to +125°C at 3 V/5 V, VSUPPLY ±10% - specified under calibrated conditions with EEPROM coefficients loaded. |
| Current Consumption | 750 μA typical active; ≤1 μA sleep at 85°C - suitable for battery-powered sensor nodes requiring long quiescent periods. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive, industrial automation, and harsh-environment monitoring. |
| Output Interfaces | I²C, SPI, PDM (capacitance & temperature), dual alarms - provides flexibility for host MCU connectivity and direct actuator control. |
Pinout & Package
Package: 4.4 mm × 5.0 mm 14-pin TSSOP (lead-free, RoHS-compliant); also available as bare die for chip-on-board assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Supply voltage input | Primary power rail (2.3–5.5 V); requires 0.1 μF decoupling capacitor to GND. |
| VSS | Ground reference | Digital and analog ground common point; must be low-impedance connection. |
| C0 / C1 | Capacitive sensor inputs | C0 = main 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 gain calibration stability. |
| SDA/MISO | I²C data / SPI MISO | Bidirectional serial data line; shares function depending on interface mode selected via EEPROM configuration. |
| SCL/SCLK | I²C clock / SPI clock | Serial clock input; polarity and phase configured for I²C or SPI protocol at startup. |
| SS | SPI slave select | Active-low chip select for SPI communication; high-impedance when not selected. |
| Alarm_High / Alarm_Low | Configurable alarm outputs | Programmable as push-pull or open-drain; assert on user-defined capacitance/temperature thresholds. |
| Ready/PDM_C | Measurement ready flag / PDM capacitance output | Indicates valid conversion complete; doubles as PDM output for filtered ratiometric capacitance signal. |
| PDM_T | PDM temperature output | Separate PDM stream for temperature measurement - enables simultaneous dual-signal transmission without multiplexing. |
| Vcore | Internal core voltage supply | Internally regulated rail; requires 0.1 μF decoupling to VSS for noise immunity. |
| GND | Ground plane connection | Secondary ground pad for thermal and EMI performance; tied to VSS internally but recommended for PCB grounding. |
| NC | No connect | Pin 14 is unconnected; must remain floating or grounded per layout guidelines - no internal connection. |
Key Features
| Feature | Design Value |
|---|---|
| Digital sensor compensation | Supports piece-wise 1st/2nd-order or single-region 3rd-order correction - eliminates need for analog trimming components and improves long-term stability. |
| Integrated temperature reference | On-die temperature sensor with <±1.5°C accuracy and nonlinearity <±0.3°C - removes requirement for external thermal sensing elements. |
| One-pass digital calibration | I²C-based PC-controlled calibration writes coefficients directly to EEPROM - reduces production test time and avoids laser trimming cost. |
| Low-power sleep mode | ≤1 μA quiescent current at 85°C - extends battery life in wireless sensor nodes while retaining alarm wake-up capability. |
| Flexible output architecture | I²C, SPI, dual PDM streams, and two independent alarms - enables direct interface to MCUs, analog filters, or discrete actuators without external logic. |
| Chip-on-board optimized layout | Die version designed for direct bonding to capacitive sensor substrates - minimizes parasitic capacitance and improves signal integrity in ultra-compact assemblies. |
Applications
| Industrial Pressure Sensing | Automotive Occupancy Detection |
|---|---|
|
Use Scenario: MEMS-based pressure transducers in hydraulic/pneumatic control systems require stable, temperature-compensated capacitance readout under vibration and thermal cycling. IC Role / Device Role / Timing Role: ZSSC3123AI7R performs real-time capacitance-to-digital conversion and applies 2nd-order temperature drift compensation using stored coefficients. Use Value: Achieves ±0.25% FSO accuracy from –40°C to +125°C without external temperature sensors or analog compensation networks. |
Use Scenario: Seat-mounted capacitive sensors detect occupant presence and position for airbag deployment logic and comfort system activation. IC Role / Device Role / Timing Role: ZSSC3123AI7R interfaces differential capacitive electrodes, delivers fast 10-bit updates (1.6 ms), and asserts Alarm_High on threshold breach. Use Value: Enables sub-10 ms response to occupancy change with built-in diagnostics and fail-safe alarm signaling. |
| Consumer Appliance Touch Controls | Medical Fluid Level Monitoring |
|
Use Scenario: Waterproof touch panels on washing machines and dishwashers use shielded capacitive electrodes behind glass or plastic overlays. IC Role / Device Role / Timing Role: ZSSC3123AI7R configures high-sensitivity 125 aF/LSB mode to resolve small capacitance shifts (<100 aF) caused by finger proximity. Use Value: Delivers robust touch detection through thick insulators with adaptive baseline tracking and noise rejection. |
Use Scenario: Disposable IV bag or dialysis fluid reservoirs use printed capacitive sensors to monitor fill level without contact or moving parts. IC Role / Device Role / Timing Role: ZSSC3123AI7R operates in low-power sleep mode (≤1 μA), wakes periodically via timer, and outputs PDM_C for analog-compatible signal processing. Use Value: Supports >1-year battery life in portable medical devices while maintaining ±0.5% level accuracy across temperature. |
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 sensor-specific correction algorithms and PDM output. | Targeted at motion + proximity fusion; not optimized for high-accuracy static capacitance measurement or industrial calibration workflows. | Choose only if motion sensing is co-required; ZSSC3123AI7R preferred for pure capacitive signal conditioning with factory calibration traceability. |
| Analog Devices AD7745 | 24-bit CDC with 16 pF full-scale range, no on-chip temperature compensation engine or programmable alarms; requires external μC for correction math. | Used in lab-grade instrumentation where resolution > accuracy; lacks integrated digital correction and alarm autonomy. | Select AD7745 for ultra-high-resolution single-point measurements; ZSSC3123AI7R delivers better system-level accuracy with embedded compensation and lower BOM count. |
Compared with ICM-42688-P and AD7745, the ZSSC3123AI7R uniquely integrates EEPROM-stored calibration, dual PDM outputs, autonomous alarms, and temperature-compensated signal conditioning in a single chip - reducing firmware overhead, PCB area, and production calibration complexity.
Availability
ZSSC3123AI7R is available at Aetrix Electronics and suitable for industrial pressure sensing, automotive occupancy detection, consumer touch controls, and medical fluid level monitoring requiring stable component supply, long-term calibration retention, and extended temperature operation.
Supply support for ZSSC3123AI7R 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.
The ZSSC3123AI7R belongs to Renesas' cLite™ family of highly integrated sensor signal conditioners, engineered specifically for low-cost, high-accuracy capacitive sensing in space-constrained and thermally demanding environments.
FAQ
What is the primary function of the ZSSC3123AI7R in a capacitive sensing system?
The ZSSC3123AI7R serves as a complete capacitive sensor signal conditioner: it digitizes capacitance changes, applies sensor-specific and temperature-dependent digital correction using EEPROM-stored coefficients, and outputs calibrated data via I²C, SPI, or PDM. Unlike generic ADCs, the ZSSC3123AI7R embeds the full signal chain - from front-end CDC to compensation math - eliminating external computation and trimming components.
Does the ZSSC3123AI7R require an external temperature sensor for compensation?
No. The ZSSC3123AI7R includes an integrated temperature sensor with internal reference, enabling full 1st- and 2nd-order temperature gain and offset drift compensation without any external components. This is confirmed in the datasheet section 9.2.2 and supported by the "Internal temperature compensation reference (no external components)" feature listing.
Can the ZSSC3123AI7R support differential capacitive sensors?
Yes. The ZSSC3123AI7R explicitly supports both single-ended (C0 only) and differential (C0 and C1) capacitive sensor configurations, as stated in the Description section and illustrated in Figure 30 ("Differential Input Capacitance Example"). Pin C1 is designated for the second sensor terminal in differential mode.
What are the power consumption characteristics of the ZSSC3123AI7R in active and sleep modes?
The ZSSC3123AI7R draws 750 μA typical during active measurement and ≤1 μA in sleep mode at 85°C. These values are measured under specified operating conditions (VDD = 3.3 V, T = 85°C) and documented in Sections 6.1 and 6.2 of the datasheet. Sleep mode retains alarm functionality and can be woken by I²C/SPI activity or threshold events.
How is calibration performed for the ZSSC3123AI7R, and where are coefficients stored?
Calibration is performed using a PC-connected I²C interface to program sensor-specific offset, sensitivity, and temperature drift coefficients into the ZSSC3123AI7R's on-chip non-volatile EEPROM. This one-pass digital procedure replaces laser trimming and ensures each ZSSC3123AI7R is digitally mated to its specific sensor - a process detailed in the "I2C interface" description on page 1 and Section 12 (EEPROM).
ZSSC3123AI7R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Series:
- cLite™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- -
- Type:
- Capacitive Sensor
- Input Type:
- Capacitive
- Output Type:
- I2C, SPI
- Current - Supply:
- 1.1 mA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
ZSSC3123AI7R FAQ
1.How can I place an order for ZSSC3123AI7R through Aetrix?
Please submit a Request for Quotation (RFQ) for ZSSC3123AI7R 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 ZSSC3123AI7R reliable?
The price and inventory of ZSSC3123AI7R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZSSC3123AI7R is usually 5 days.
3.What payment methods are accepted for ZSSC3123AI7R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZSSC3123AI7R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZSSC3123AI7R?
ZSSC3123AI7R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZSSC3123AI7R 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 ZSSC3123AI7R?
For technical support, including ZSSC3123AI7R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZSSC3123AI7R requirements.
6.How does Aetrix verify that ZSSC3123AI7R is sourced from the original manufacturer or authorized distributors?
All ZSSC3123AI7R 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 ZSSC3123AI7R meets industry standards.
7.What is the process for return or replacement of ZSSC3123AI7R?
All ZSSC3123AI7R units undergo pre-shipment inspection (PSI). If there is an issue with ZSSC3123AI7R, 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 ZSSC3123AI7R part is unused and in its original packaging.
Return procedure for ZSSC3123AI7R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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