NXP Semiconductors PCA9702PW,112

Overview

PCA9702PW,112 from NXP Semiconductors is an 8-channel 18 V tolerant SPI General Purpose Input (GPI) shift register for switch status monitoring in automotive and industrial systems. It features open-drain interrupt output, 2.5–5.5 V supply range, <2.5 µA supply current, and operates from −40 °C to +125 °C. It supports 12 V battery, reverse battery, 27 V jump start, and 40 V load dump conditions when used with ≥100 kΩ series resistors on inputs.

For engineers reviewing the PCA9702PW,112 datasheet, PCA9702PW,112 pinout, PCA9702PW,112 application, or PCA9702PW,112 equivalent, key selection criteria include 18 V input tolerance with external resistor, SPI interface timing up to 5 MHz, interrupt masking capability via INT_EN, low-quiescent-current operation, and TSSOP16 package compatibility with automotive-grade thermal and ESD robustness.

Technical Context

The PCA9702PW,112 implements an 8-bit parallel-to-serial shift register architecture synchronized to a 4-wire SPI interface (CS, SCLK, SDIN, SDOUT). Input status is captured on the falling edge of CS and shifted out on rising SCLK edges, with SDIN sampled on falling SCLK edges.

Its GPI inputs feature programmable interrupt generation on state change, enabled/disabled via INT_EN, and support cyclic biasing for ultra-low-power wake-up monitoring in SBC-based ECUs. Input thresholds are defined as VIL ≤ 0.4 × VDD (min 2.0 V at 4.5 V) and VIH ≥ 0.7 × VDD, with 100 kΩ series resistors enabling 18 V breakdown tolerance and automotive transient resilience.

Key Specifications

Pinout & Package

TSSOP16 package (SOT403-1): plastic thin shrink small outline, 16 leads, 4.4 mm body width, 0.65 mm pitch, exposed pad not present.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar general-purpose input monitoring applications.

Compared with PCA9701PW,118, PCA9702PW,112 reduces pin count and footprint by 33% while retaining identical automotive transient resilience and ultra-low power consumption; versus PCA9704PW,118, it lacks per-input interrupt masking but delivers identical core functionality at lower cost and simpler configuration.

Availability

PCA9702PW,112 is available at Aetrix Electronics and suitable for body control modules, industrial switch monitoring systems, and emergency lighting control requiring stable component supply across automotive and industrial production lifecycles.

Supply support for PCA9702PW,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 PCA9702PW,112 belongs to NXP's automotive-qualified GPI family designed specifically for robust, low-power switch monitoring in harsh environments - targeting ECU wake-up, BCM, and SBC extension use cases.

FAQ

What is the maximum input voltage the PCA9702PW,112 can tolerate on its GPI pins?

The PCA9702PW,112 GPI pins 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. With appropriate resistor sizing, the device supports automotive transients including 40 V load dump and 27 V jump start per ISO 16750-2, verified in NXP's application design-in documentation for PCA9702PW,112.

Does the PCA9702PW,112 support SPI Mode 0 (CPOL = 0, CPHA = 0)?

Yes, the PCA9702PW,112 operates in SPI Mode 0: data is sampled on the falling edge of SCLK and shifted out on the rising edge. The CS falling edge captures input status, and the first SCLK rising edge loads the shift register - matching standard Mode 0 timing with CPOL = 0 and CPHA = 0, as confirmed in Section 7.1 of the PCA9702PW,112 datasheet.

How does the INT_EN pin affect interrupt behavior in the PCA9702PW,112?

When INT_EN is LOW, the INT pin enters high-impedance state and no interrupt is driven - effectively disabling interrupt output without affecting internal status capture. When INT_EN is HIGH, INT asserts active LOW upon any input state change. This enables software-controlled interrupt masking per PCA9702PW,112 device in multi-node systems.

Can multiple PCA9702PW,112 devices be daisy-chained via SPI?

Yes - connect SDOUT of one PCA9702PW,112 to SDIN of the next, with shared CS and SCLK lines. INT outputs may be tied together (wired-AND) using a single pull-up resistor due to their open-drain structure. No external logic is required, and the daisy-chain preserves full 8-bit resolution per device as documented in Section 7 of the PCA9702PW,112 product data sheet.

What is the minimum series resistor value required for 24 V input monitoring with the PCA9702PW,112?

For 24 V input monitoring, the minimum series resistor is 100 kΩ - the same value specified for 12 V battery and 27 V jump start support. Equation 1 in Section 7.3 confirms Rs = (voltage applied − 17 V) / II, where II ≤ 100 µA; for 24 V, Rs ≥ 70 kΩ, but NXP mandates ≥100 kΩ for guaranteed reliability across temperature and process variation in PCA9702PW,112 designs.