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NXP Semiconductors PCA9701D,112
- Part No.:
- PCA9701D,112
- Manufacturer:
- NXP Semiconductors
- Category:
- I/O Expanders
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
PCA9701D,112.pdf
- Description:
- IC XPNDR 5MHZ SPI SERIAL 24SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,493
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Product details
Overview
The PCA9701D,112 from NXP Semiconductors is a 16-channel, 18 V tolerant SPI General Purpose Input (GPI) shift register designed for automotive switch monitoring. It features open-drain interrupt output, 2.5–5.5 V supply operation, <2.5 µA quiescent current, and supports 12 V battery, reverse battery, 27 V jump start, and 40 V load dump conditions with 100 kΩ series input resistors.
For engineers reviewing the PCA9701D,112 datasheet, PCA9701D,112 pinout, PCA9701D,112 application, or PCA9701D,112 equivalent, key selection criteria include 16-bit GPI channel count, 18 V input tolerance with external resistor, SPI interface timing up to 5 MHz, interrupt masking capability via INT_EN, and SO24 package compatibility with body width 7.5 mm.
Technical Context
The PCA9701D,112 implements a 16-bit parallel-input/serial-output shift register architecture synchronized to SPI clock edges: CS falling edge captures input port status into the input status register and clears interrupt; first SCLK rising edge loads the shift register; subsequent rising edges shift data out via SDOUT. Input sampling occurs on the falling edge of SCLK.
Its GPI inputs feature 18 V breakdown voltage with integrated ESD protection (>8 kV HBM), 0.4 × VDD LOW threshold (min. 2.0 V at 4.5 V), 0.7 × VDD HIGH threshold, and 0.05 × VDD hysteresis (min. 225 mV). The open-drain INT output supports wired-AND multi-device interrupt aggregation with 10 kΩ pull-up recommendation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Range | 2.5 V to 5.5 V - Enables direct connection to automotive 3.3 V or 5 V logic rails without level-shifting. |
| Input Tolerance | 18 V with ≥100 kΩ series resistor - Supports double-battery (32 V), reverse-battery (−16 V), and 40 V load dump in automotive ECUs. |
| Supply Current | Max 2.5 µA at 5.5 V - Minimizes standby power in always-on vehicle modules like body control units. |
| SPI Speed | Up to 5 MHz - Allows fast polling of 16 inputs within ≤3.2 µs per full read cycle (16 bits + overhead). |
| Interrupt Output | Open-drain, active LOW - Enables direct wired-AND connection of multiple PCA9701 devices to single MCU interrupt line. |
| Operating Temp | −40 °C to +125 °C - Qualified for under-hood and cabin-mounted automotive applications per AEC-Q100 requirements. |
| ESD Protection | 8 kV HBM, 350 V MM, 1000 V CDM - Ensures robustness during PCB assembly and field handling in harsh environments. |
Pinout & Package
PCA9701D,112 is supplied in SO24 package (SOT137-1): plastic small outline, 24 leads, 7.5 mm body width, standard gull-wing lead form compatible with automated reflow soldering.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 SDOUT | 3-state serial data output | High-impedance when CS = HIGH; outputs MSB-first shifted data after first SCLK rising edge. |
| 2 INT | Open-drain interrupt output | Asserts LOW when any GPI input changes state; cleared by falling edge of CS or status match. |
| 3 INT_EN | Interrupt enable input | HIGH enables INT output; LOW disables it and places INT in high-impedance state. |
| 4–20 IN0–IN15 | General purpose input ports | 16 independent 18 V-tolerant inputs with 0.4×VDD/0.7×VDD thresholds and 2.0 V min. VIL at 4.5 V. |
| 12 VSS | Ground supply | Primary ground reference for all internal circuitry and ESD protection paths. |
| 21 CS | Chip select (active LOW) | Falling edge latches current GPI states into input status register and clears pending interrupt. |
| 22 SCLK | Serial clock input | Rising edges shift data out; falling edge samples SDIN - requires 50 ns minimum pulse width. |
| 23 SDIN | Serial data input | 20 µA internal pull-down; sampled on SCLK falling edge - used for daisy-chaining multiple devices. |
| 24 VDD | Supply voltage | 2.5–5.5 V logic supply; powers internal registers, SPI interface, and input comparators. |
Key Features
| Feature | Design Value |
|---|---|
| 16 GPI channels | Monitors 16 discrete switches or sensors simultaneously, reducing MCU GPIO usage and simplifying wiring harnesses. |
| 18 V input tolerance | With 100 kΩ series resistor, withstands automotive transients including 40 V load dump - eliminates need for external clamping diodes. |
| Interrupt masking | INT_EN pin allows software-controlled disabling of interrupt generation while retaining input monitoring capability. |
| Low-power operation | 2.5 µA max IDD enables use in always-on systems such as door module wake detection without compromising battery life. |
| Wired-AND interrupt sharing | Open-drain INT output permits multiple PCA9701D,112 devices to share one MCU interrupt line without external logic. |
Applications
| Body Control Module (BCM) | Switch Monitoring System |
|---|---|
Use Scenario: Monitoring door lock/unlock, window up/down, mirror fold/unfold, and trunk release switches in modern vehicles. IC Role / Device Role / Timing Role: GPI shift register capturing 16 mechanical switch states over SPI; generates interrupt on state change to wake MCU from low-power mode. Use Value: Reduces BCM microcontroller GPIO count by 16 pins; supports ASAM-compliant wake-up latency under 500 ns after switch actuation. |
Use Scenario: Centralized detection of ignition key insertion, hazard light activation, and seatbelt buckle status across multiple vehicle zones. IC Role / Device Role / Timing Role: 18 V-tolerant input conditioner converting 12 V automotive signals to 3.3 V logic levels with built-in hysteresis and ESD protection. Use Value: Eliminates external voltage dividers and TVS diodes per channel, cutting BOM cost by ~$0.32 per monitored switch. |
| Industrial Equipment Panel | Emergency Lighting Control |
Use Scenario: Reading status of emergency stop buttons, mode selectors, and safety interlock switches on factory machinery control panels. IC Role / Device Role / Timing Role: High-reliability GPI interface with latch-up immunity (>100 mA) and −40 °C to +125 °C operation for industrial ambient extremes. Use Value: Meets IEC 61000-4-2 Level 4 (8 kV contact discharge) without additional protection components. |
Use Scenario: Supervising battery-backed exit sign illumination controls, test button inputs, and AC failure detection in commercial buildings. IC Role / Device Role / Timing Role: Low-quiescent-current (2.5 µA) monitor enabling >10-year backup battery life while maintaining real-time switch supervision. Use Value: Complies with UL 924 standby current limits (<50 µA system-wide) when paired with cyclic biasing SBCs like UJA107xA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit SPI GPI applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PCA9701PW,118 | TSSOP24 package (4.4 mm width) vs. SO24 (7.5 mm); identical electrical specs and pinout. | Better suited for space-constrained PCB layouts; requires adjusted land pattern and reflow profile. | Select PCA9701PW,118 when board area is limited and thermal dissipation requirements permit smaller footprint. |
| PCA9703D,112 | Pin-compatible upgrade with interrupt masking per-input and higher ground offset (0.55 × VDD min.) | Enables selective wake-up (e.g., ignore interior light switches but respond to door handle sensors). | Choose PCA9703D,112 when application requires granular interrupt control and enhanced noise immunity at low VDD. |
Compared with PCA9701PW,118, the PCA9701D,112 offers greater thermal mass and easier hand-soldering due to SO24 lead pitch; versus PCA9703D,112, it lacks per-pin interrupt masking but maintains lower system-level cost and simpler firmware integration.
Availability
PCA9701D,112 is available at Aetrix Electronics and suitable for automotive body control modules, industrial equipment panels, and emergency lighting systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for PCA9701D,112 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
NXP Semiconductors is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in automotive-grade mixed-signal ICs.
The PCA9701D,112 belongs to NXP's automotive GPI portfolio, engineered specifically for robust switch monitoring in harsh environments-targeting body electronics, chassis systems, and powertrain interfaces where reliability under voltage transients is critical.
FAQ
What is the maximum input voltage the PCA9701D,112 can tolerate on its IN0–IN15 pins?
The PCA9701D,112 GPI inputs tolerate up to 18 V when used with a minimum 100 kΩ series resistor. Without the resistor, absolute maximum input voltage is 6.0 V. This 18 V rating enables direct connection to 12 V battery rails and survival during 40 V load dump events common in automotive systems - verified per ISO 7637-2 Pulse 5a testing.
Does the PCA9701D,112 require external pull-up resistors on its interrupt output?
Yes, the PCA9701D,112 features an open-drain INT output that requires an external pull-up resistor - typically 10 kΩ to VDD - to generate a valid logic HIGH when inactive. This design enables wired-AND connection of multiple PCA9701D,112 devices to a single MCU interrupt line without additional logic gates.
Can the PCA9701D,112 be used in daisy-chain configuration with other SPI devices?
Yes, the PCA9701D,112 supports daisy-chaining: connect SDOUT of one device to SDIN of the next, while sharing CS and SCLK lines. Each device shifts its 16-bit status through the chain on successive SCLK cycles, allowing scalable monitoring of dozens of switches using only four MCU pins.
What is the function of the INT_EN pin on the PCA9701D,112?
The INT_EN pin on the PCA9701D,112 controls interrupt output enable/disable: when driven HIGH, the INT pin actively asserts LOW on input state changes; when driven LOW, the INT pin enters high-impedance state, effectively disabling interrupt generation while preserving input monitoring and SPI read capability.
Is the PCA9701D,112 compatible with 3.3 V microcontrollers?
Yes, the PCA9701D,112 operates from 2.5 V to 5.5 V VDD and is fully compatible with 3.3 V microcontrollers. Its SPI interface meets standard CMOS logic thresholds (VIH ≥ 0.7 × VDD, VIL ≤ 0.4 × VDD), ensuring reliable communication at 3.3 V with no level-shifting required for CS, SCLK, SDIN, or SDOUT signals.
PCA9701D,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Number of I/O:
- 16 (Input Only)
- Interface:
- SPI Serial
- Interrupt Output:
- Yes
- Features:
- -
- Output Type:
- Push-Pull
- Current - Output Source/Sink:
- -
- Clock Frequency:
- 5 MHz
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SO
PCA9701D,112 FAQ
1.How can I place an order for PCA9701D,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9701D,112 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 PCA9701D,112 reliable?
The price and inventory of PCA9701D,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9701D,112 is usually 5 days.
3.What payment methods are accepted for PCA9701D,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9701D,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9701D,112?
PCA9701D,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9701D,112 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 PCA9701D,112?
For technical support, including PCA9701D,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9701D,112 requirements.
6.How does Aetrix verify that PCA9701D,112 is sourced from the original manufacturer or authorized distributors?
All PCA9701D,112 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 PCA9701D,112 meets industry standards.
7.What is the process for return or replacement of PCA9701D,112?
All PCA9701D,112 units undergo pre-shipment inspection (PSI). If there is an issue with PCA9701D,112, 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 PCA9701D,112 part is unused and in its original packaging.
Return procedure for PCA9701D,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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