PCAL9722HN/Q900 - 22-bit SPI I/O Expander AEC-Q100 | NXP
Référence : PCAL9722HN/Q900 ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $0 | $0,00 |
| 10 | $0 | $0,00 |
| 100 | $0 | $0,00 |
| 500 | $0 | $0,00 |
| 1 000 | $0 | $0,00 |
PCAL9722HN/Q900 Présentation
An I/O expander is a peripheral IC that adds general-purpose input/output pins to a microcontroller (MCU) or microprocessor (MPU) over a serial interface, extending pin count without upgrading to a larger device. In the power-management and interface hierarchy, I/O expanders sit in the system I/O subsystem alongside GPIO controllers, port expanders and level translators. The PCAL9722 is unusual in combining both functions: expansion and translation.
Key features include 22 configurable GPIO channels, a 5 MHz SPI interface, ultra-low-voltage operation down to 1.1 V for direct connection to advanced low-core-voltage MCUs, Agile I/O functions such as configurable output drive strength and latchable inputs, a dedicated interrupt output, and an external reset input for deterministic power-up states.
Technically, the PCAL9722 uses a dual-supply translating architecture: the SPI side operates from 1.1 V to 5.5 V while the I/O side supports a separate port supply, allowing safe interfacing between a 1.2 V core-domain MCU and 3.3 V or 5 V loads. The Agile I/O feature set provides register-level control over pull-up/pull-down, drive strength and input latching, reducing external components.
Typical applications include automotive body and zone control modules, sensor and actuator fan-out in AEC-Q100-qualified systems, and industrial I/O modules where an MCU pin budget is exhausted. The Q900 ordering variant targets automotive temperature-grade builds.
Design tip: keep the SPI clock at or below 5 MHz and use the reset pin to guarantee defined GPIO states during low-voltage brownouts.
This page synthesizes distributor availability, drop-in alternatives, and design guidance not found in the manufacturer datasheet.
Alternatives de remplacement direct pour PCAL9722HN/Q900 — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
PCAL9722HN
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
PCAL9722HN/Q900MP
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
PCAL9722HN/Q900HP
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
PCAL9722HN/Q900 Spécifications
| Fonction | 22-bit SPI level translating I/O expander with Agile I/O |
| Number of GPIO Channels | 22 |
| Interface | SPI |
| Maximum SPI Clock Frequency | 5 MHz |
| Supply Voltage Range (SPI bus side) | 1.1 V to 5.5 V |
| Level Translation Range | 1.1 V to 5.5 V (bidirectional) |
| Boîtier | HVQFN32 (5x5 mm), exposed pad |
| Type de montage | Surface Mount |
| Automotive Qualification | AEC-Q100 compliant |
| Interrupt Output | Yes |
| Reset Input | Yes |
| Agile I/O Features | Yes (configurable drive, pull-up/down, input latch) |
| Package Marking | 9722Q |
| Statut du cycle de vie | Active |
Guide de configuration des broches du PCAL9722HN/Q900 9722q
Configuration des broches du PCAL9722HN/Q900 (boîtier 9722q). La numérotation des broches, les fonctions et les schémas de connexion sont définis dans la fiche technique du fabricant. Consultez-la pour l'empreinte exacte et les directives de soudage.
Aucune donnée de brochage détaillée disponible pour PCAL9722HN/Q900.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
PCAL9722HN/Q900 convient pour 6 applications: Automotive Body and Zone Control Modules, Low-Voltage MCU GPIO Expansion, Industrial I/O Modules and PLC Racks, Sensor and Actuator Fan-Out in Test Equipment, Automotive Gateway and Telematics Boards, Battery Management and Power Distribution Monitoring.
Automotive Body and Zone Control Modules
Modern automotive electrical architectures are moving toward zonal controllers that fan out many discrete loads - lamps, relays, door switches, seat occupancy sensors - from a single controller. The PCAL9722HN/Q900 fits this role because its 22 GPIO channels provide high fan-out in one AEC-Q100-compliant HVQFN32 device, and its 1.1 V to 5.5 V SPI-side supply lets it hang directly off low-core-voltage automotive MCU domains without external level shifters. The 5 MHz SPI bus gives sub-100-microsecond updates of all 22 channels, fast enough for load diagnostics and switch debounce polling in a 10 ms task loop, while the interrupt output flags asynchronous switch events between polls. Use the reset input to force defined load states during cranking-related brownouts, a common automotive failure mode.
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Low-Voltage MCU GPIO Expansion
Advanced MCUs and MPUs increasingly run core and I/O rails at or below 1.8 V, leaving designers with a level-translation problem when interfacing legacy 3.3 V or 5 V peripherals. The PCAL9722HN/Q900 solves this directly: per the NXP datasheet it operates from 1.1 V to 5.5 V on the SPI bus side and provides bidirectional translation across that span, so a 1.1 V-core MCU can safely drive 3.3 V loads through the expander. This eliminates discrete dual-supply translators that would otherwise consume board area around each signal. The Agile I/O features let firmware configure pull-up/pull-down and drive strength per pin in software, adapting one board design to multiple load types. Budget SPI transactions at 5 MHz maximum to guarantee timing margins across the full voltage range.
Recommandé
Industrial I/O Modules and PLC Racks
Industrial PLC and remote I/O racks routinely need dozens of isolated or semi-isolated digital input/output points driven from a compact controller board. The PCAL9722HN/Q900 consolidates 22 channels into one 5x5 mm HVQFN32 footprint, cutting component count versus discrete transceivers plus shift registers. Its SPI interface integrates cleanly with existing SPI-peripheral chains, and the interrupt output enables event-driven input scanning instead of continuous polling, lowering bus traffic in multi-drop systems. Although the /Q900 variant carries automotive AEC-Q100 qualification, that robustness level is a benefit in industrial environments with wide temperature excursions and vibration. Designers should use the reset input tied to a supervisory circuit so that all outputs return to safe states after a supply dip, protecting downstream actuators.
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Sensor and Actuator Fan-Out in Test Equipment
Bench instruments and automated test fixtures frequently multiplex relays, indicator LEDs, limit switches, and interlock sense lines - all pure GPIO signals - from one controller. The PCAL9722HN/Q900 provides 22 such channels over a shared 5 MHz SPI bus, so a single SPI peripheral can serve the expander alongside ADCs and DACs with chip-select demultiplexing. Its Agile I/O input latching captures short switch pulses that would otherwise be missed between polls, an important feature for interlock monitoring where a transient must not be lost. Level translation between the controller's low-voltage logic and 5 V fixture hardware is integrated, removing glue logic. The exposed-pad HVQFN32 keeps the expander close to connector headers, shortening routed fan-out and improving signal integrity on switch sense lines.
Recommandé
Automotive Gateway and Telematics Boards
Telematics and gateway control boards combine a communication SoC with numerous discrete status and control points: SIM-detect, ignition sense, LED status banks, and antenna-switch controls. The PCAL9722HN/Q900 adds these 22 GPIO points over SPI while its translating architecture bridges the typical 1.8 V gateway SoC I/O domain to 3.3 V or 5 V automotive signals without external translators. The AEC-Q100 compliance of the /Q900 variant satisfies automotive sourcing requirements that consumer-grade expanders cannot. Its interrupt output can wake or signal the host on ignition-state change without firmware polling, supporting low-power standby modes, and the reset input ties into the board supervisor so that outputs default safe during the ignition power cycle. Keep the SPI bus below 5 MHz and route it short of the SoC.
Recommandé
Battery Management and Power Distribution Monitoring
Battery junction boxes and power-distribution boards monitor contactor states, fusing events, and service switches while driving status LEDs and control relays. The PCAL9722HN/Q900 aggregates 22 of these digital points over a 5 MHz SPI bus and, per the NXP datasheet, its ultra-low-voltage 1.1 V to 5.5 V SPI-side supply allows direct interfacing with low-voltage monitoring MCUs common in BMS designs. Input latching via the Agile I/O feature preserves short fault pulses - such as a contactor aux contact chattering - until the host reads the register, preventing missed fault events. The AEC-Q100 qualification of the /Q900 variant is frequently mandated for in-vehicle BMS sourcing. Use the reset input supervised by the BMS power-good signal to guarantee contactor-control outputs are inactive through supply transients.
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Récapitulatif des produits recommandés
Données de référence d'ingénierie pour PCAL9722HN/Q900 — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | PCAL9722HN | PCAL9722HN/Q900MP | PCAL9722HN/Q900HP |
|---|---|---|---|---|
| Package | HVQFN32 (5x5 mm), exposed pad | HVQFN32 (5x5 mm) - same | HVQFN32 (5x5 mm) - same | HVQFN32 (5x5 mm) - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| GPIO Channels | 22 | 22 | 22 | 22 |
| Interface | SPI, 5 MHz | SPI, 5 MHz | SPI, 5 MHz | SPI, 5 MHz |
| Supply Voltage Range | 1.1 V to 5.5 V (SPI side) | 1.1 V to 5.5 V | 1.1 V to 5.5 V | 1.1 V to 5.5 V |
| AEC-Q100 Qualification | Yes | No (commercial grade) | Yes | Yes |
| Interrupt Output / Reset | Yes / Yes | Yes / Yes | Yes / Yes | Yes / Yes |
Principaux différenciateurs
- AEC-Q100 automotive qualification (vs PCAL9722HN)
- Integrated SPI level translation down to 1.1 V (vs PCAL9722HN)
- 22 channels in one device (vs PCAL9722HN)
Notes de conception
The HVQFN32 package has an exposed pad on the underside that must be soldered to a grounded copper pour. Use an array of thermal vias (typically 4 to 9) connecting the pad to inner ground planes; this serves both thermal dissipation and a low-inductance ground return for the 5 MHz SPI switching currents. Follow the NXP HVQFN application soldering guidelines for stencil aperture design - typically 50-70% coverage on the exposed-pad aperture to avoid voiding and component float during reflow.
Keep SPI clock at or below 5 MHz per the datasheet maximum, and keep CS-to-SCLK setup margins consistent with SPI mode requirements in the NXP PCAL9722 datasheet. Route SCLK, MOSI, MISO and CS as short, direct traces; at 5 MHz signal integrity is not difficult, but ringing on the CS line during level transitions between voltage domains can cause spurious register writes, so a small series resistor (22-33 ohm) on SCLK and CS near the driver is a low-cost safeguard.
Use the dedicated reset input, tied to a supervisory or power-good circuit, so all 22 GPIOs default to a defined state through brownouts - particularly important in automotive and BMS applications where outputs may drive relays or contactors. Also configure unused pins as inputs with pull-ups or as outputs driven low via the Agile I/O registers at initialization; floating inputs on a CMOS expander increase supply current and can oscillate. Verify the /Q900 grade suffix on received marking 9722Q to confirm automotive qualification.
Informations de conformité
AEC-Q100 compliance is explicitly stated in NXP and distributor listings for the /Q900 variant. RoHS/REACH/lead-free status should be confirmed on the NXP product page environmental section.
