PCA9703PW/Q900,118 - 16-Bit SPI GPI 18V Tolerant | NXP
MPN: PCA9703PW/Q900,118 ✓ Hoạt độngPCA9703PW/Q900,118 Tóm tắt
A general purpose input shift register is a specialized interface IC that converts parallel logic levels from switches or sensors into a serial data stream. In the system hierarchy it sits between raw switch inputs and a microcontroller: instead of dedicating 16 MCU pins to switch monitoring, a single SPI port reads all 16 inputs as a serial word, reducing pin count, wiring harness complexity, and cost in distributed control systems.
Key features include 18 V tolerance on all GPI pins, allowing direct connection to automotive battery-nominal rails without level shifting; a maskable interrupt output (INT) with an INT_EN pin that disables the inputs and interrupt to minimize battery drain in cyclically powered systems; and an SDIN pin with pull-down that supports daisy-chaining multiple devices on a single SPI bus for 32, 48, or more inputs.
Architecturally, the PCA9703 uses a shift register with a dedicated output enable controlled by CS. The 3 V logic thresholds on the serial interface ensure compatibility with both 3.3 V and 5 V controllers. Switch status is captured in the parallel input register and shifted out MSB-first on SCLK edges, with the interrupt flag readable on the first serial byte so the MCU can branch quickly on any input change.
Typical applications include automotive switch monitoring for door, seat, and steering-column controls, body control modules and keypads, and industrial panels requiring isolated or battery-tolerant digital inputs. The 18 V tolerance is the decisive parameter wherever switches are wired to unregulated supply rails.
A key design consideration: the GPI inputs require external pull-up or pull-down resistors to the switched rail; the INT_EN pin should be driven low during system sleep to eliminate quiescent current drawn through those resistors.
This page synthesizes distributor pricing, drop-in alternative analysis, design notes, and application guidance not found in the manufacturer datasheet, making it a one-stop engineering reference for the PCA9703PW/Q900,118.
Bộ thay thế dễ dàng lắp đặt cho PCA9703PW/Q900,118 — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
PCA9703PW,118
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PCA9703PW,112
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PCA9703PW/Q900,118 Thông số kỹ thuật
| Chức năng | 18 V tolerant SPI 16-bit GPI shift register with maskable INT |
| Number of Input Lines | 16 (input only) |
| Serial Interface | SPI |
| Maximum SPI Clock Frequency | 5 MHz |
| Điện áp cung cấp | 4.5 V to 5.5 V |
| GPI Pin Voltage Tolerance | 18 V |
| Logic Threshold | 3 V threshold on serial interface |
| Interrupt Output | Maskable INT with INT_EN pin |
| Daisy-Chain Support | Yes (SDIN input with pull-down) |
| Khoảng nhiệt độ hoạt động | -40 C to +125 C |
| Qualification | Automotive (Q900 suffix) |
| Hộp | TSSOP-24 |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
| Product Status | Active |
| Typical Application Domain | Switch input status monitoring |
Hướng dẫn cấu hình chân PCA9703PW/Q900,118 tssop-24
Cấu hình chân cho PCA9703PW/Q900,118 (tssop-24 gói). Số thứ tự chân, chức năng và sơ đồ kết nối được xác định trong tài liệu thông số kỹ thuật của nhà sản xuất. Tham khảo nó để biết footprint và hướng dẫn hàn chính xác.
Không có dữ liệu chân cụ thể sẵn có cho PCA9703PW/Q900,118.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
PCA9703PW/Q900,118 phù hợp cho 6 Áp dụngs: Automotive Body Control Modules, Steering Column and Seat Switch Monitoring, Industrial Control Panels and Keypads, Distributed Switch Modules with Daisy-Chain SPI, Battery-Powered and Low-Power Sensor Nodes, Test and Measurement Fixture Input Monitoring.
Automotive Body Control Modules
In body control modules (BCMs), dozens of switches - door locks, window lift, mirror adjust, hood and trunk contacts - must be monitored reliably while wired to battery-nominal rails. The PCA9703PW/Q900,118's 18 V tolerant GPI pins allow each switch contact to connect directly to the shift register inputs through simple pull-up or pull-down resistors, eliminating per-channel clamping or divider networks. Its automotive -40 C to +125 C rating and Q900 qualification suffix match BCM environmental requirements. The maskable INT output lets the MCU sleep until any switch changes, and the INT_EN pin disables monitoring and current draw through the switch resistors during vehicle sleep, protecting battery drain budgets in cyclically supplied architectures.
Được đề xuất
Steering Column and Seat Switch Monitoring
Steering-column controls, seat position, and memory seat switches are typically wired through long harnesses that pick up transients well above 5 V logic levels. The PCA9703's 18 V GPI tolerance absorbs these excursions, and the 16 inputs consolidate an entire switch cluster into one TSSOP-24 device, shrinking connector pin count on the column module. Daisy-chaining two or three PCA9703 devices over one SPI port and shared CS reads all switch banks in a single 32- or 48-bit shift, keeping harness latency negligible at a 5 MHz SPI clock. The maskable interrupt flags any contact change immediately, so the MCU only polls after real events, reducing bus traffic and MCU wakeups in a noise- and cost-sensitive space.
Được đề xuất
Industrial Control Panels and Keypads
Industrial panels sense selector switches, limit switches, and operator keypads whose contacts are often wired to 12 V or 24 V-derived rails. While the PCA9703's 18 V tolerance covers 12 V-nominal inputs directly, higher rails can be divided or clamped; in either case, the 3 V serial thresholds allow interfacing to either 3.3 V or 5 V PLC logic. Multiple PCA9703 devices daisy-chain on a single SPI bus so one MCU SPI peripheral expands to 48 or 64 inputs, cutting I/O wiring dramatically inside the panel. The INT_EN pin allows the panel to power down switch sensing between scans, useful in battery-backed remote I/O nodes, and the INT output supports interrupt-driven scanning instead of continuous polling at full 5 MHz bus speed.
Được đề xuất
Distributed Switch Modules with Daisy-Chain SPI
In distributed architectures - door modules, seat modules, tailgate modules - each module monitors a handful of switches, and a single controller gathers status from all modules. The PCA9703's SDIN pin includes an internal pull-down specifically to prevent floating nodes in daisy-chain applications, per the NXP data sheet, making multi-device serial topologies robust without extra components. Each module's SDOUT feeds the next module's SDIN, and one CS frame shifts out the entire system switch state. Because all GPI pins tolerate 18 V, harness-level transients from solenoid switching or load dump coupling do not damage inputs. The maskable INT can be wire-shared so any module's change-of-state wakes the controller for a consolidated read.
Được đề xuất
Battery-Powered and Low-Power Sensor Nodes
Battery-backed telemetry and remote I/O nodes must keep quiescent current near zero between sampling windows. The PCA9703's INT_EN pin simultaneously disables the GPI input monitoring and the INT output, minimizing the battery drain that pull-up or pull-down resistors would otherwise cause during sleep, as documented in the NXP data sheet. The controller powers the node cyclically, asserts INT_EN active to sample switch state via a short SPI read at up to 5 MHz, then deasserts INT_EN before powering down. This duty-cycled approach suits gate/valve position monitoring, tamper switches, and access panels where coin-cell or lead-acid battery life is a hard requirement and continuous polling is not acceptable.
Được đề xuất
Test and Measurement Fixture Input Monitoring
Production test fixtures and rack instruments monitor hundreds of limit switches, interlocks, and fixture-present contacts. Daisy-chained PCA9703 devices provide a scalable input count on one SPI bus and shared CS, so a single controller reads 64 or more discrete inputs in one shift operation at 5 MHz, enabling fast pass/fail sequencing. The 18 V GPI tolerance tolerates the varied logic domains found across fixture wiring, and 3 V serial thresholds interface directly with modern controller FPGAs and MCUs. The maskable INT supports interrupt-driven interlock handling: if a safety interlock opens mid-test, the INT line immediately signals the controller, which then reads the chain to identify the exact input that changed, improving fixture uptime and diagnostics.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PCA9703PW/Q900,118 — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | PCA9703PW,118 | PCA9703PW,112 |
|---|---|---|---|
| Package | TSSOP-24 | TSSOP-24 - same | TSSOP-24 - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Number of GPI Inputs | 16 (input only) | 16 (input only) | 16 (input only) |
| GPI Voltage Tolerance | 18 V | 18 V | 18 V |
| SPI Clock Frequency | 5 MHz | 5 MHz | 5 MHz |
| Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V |
| Operating Temperature | -40 C to +125 C (automotive Q900) | -40 C to +125 C (catalog grade) | -40 C to +125 C (catalog grade) |
| Automotive Qualification | Yes (Q900 suffix) | No (standard grade) | No (standard grade) |
Bảo phân biệt quan trọng
- Automotive Q900 qualification with 125 C rating (vsPCA9703PW,118)
- 18 V GPI tolerance eliminates per-channel protection (vsPCA9675PW,118)
- Daisy-chain SPI expands inputs without address pins (vsPCA9703PW,112)
Ghi chú thiết kế
Place a 100 nF ceramic decoupling capacitor directly across VDD and GND of the PCA9703, as close to pins as possible, with a low-ESR bulk capacitor (4.7 uF to 10 uF) shared per SPI bus segment. Keep the SPI traces (SCLK, SDIN, SDOUT, CS) short and away from switch harnesses carrying transients; since GPI pins can see automotive transients while the die runs at 5 V, ground the TSSOP-24 exposed routing area solidly and avoid routing fast SPI edges parallel to GPI traces to prevent coupling into the input latches.
Do not rely on the internal SDIN pull-down for the first device in a daisy chain driven directly by an MCU SDOUT - it exists to protect unused chains. Ensure each GPI input has a defined external pull-up or pull-down to the switched rail; floating inputs latch unpredictably. Remember the supply is 4.5 V to 5.5 V: powering the device at 3.3 V violates the operating range even though the serial thresholds are 3 V compatible. Verify the Q900 ordering code is required by your automotive quality documentation before substituting the catalog grade.
In cyclically powered systems, drive INT_EN inactive before removing supply so the GPI input networks stop drawing current through pull resistors, minimizing battery drain as described in the NXP data sheet. Estimated: with 10 kOhm pull-ups to a 12 V rail on all 16 inputs, continuous current is roughly 19 mA (12 V / 10 kOhm x 16), so disabling INT_EN during sleep is essential for battery applications. Size pull resistors to guarantee valid thresholds at the GPI pins given the rail voltage and contact leakage.
Thông tin tuân thủ
RoHS compliant per NXP product page (Active status, Environmental section). Q900 suffix denotes automotive quality flow; explicit REACH, halogen-free, and conflict-minerals statements should be confirmed on the NXP product page environmental documentation.
