TXE8124-Q1 - 24-Bit Automotive SPI I/O Expander | TI
Teilenummer: TXE8124-Q1 ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $1.45 | $1,45 |
| 10 | $1.3 | $13,00 |
| 100 | $1.08 | $108,00 |
| 500 | $0.92 | $460,00 |
| 1.000 | $0.79 | $790,00 |
TXE8124-Q1 Übersicht
An SPI I/O expander is a type of interface IC within the broader semiconductor hierarchy (interface IC -> I/O expander -> logic/integration device) that adds general-purpose parallel input/output pins to a microcontroller or processor using the four-wire Serial Peripheral Interface protocol. It belongs to the same product family as GPIO extenders and port expanders, and is the SPI counterpart to I2C expanders such as the PCX857x family, offering higher speed and deterministic timing.
Key features include 24 configurable GPIO channels with individual I/O configuration registers, a dedicated interrupt output (INT) that flags input state changes to the host controller, and a reset input (RST) for rapid recovery of the register map to a known default state. The device supports both standard point-to-point SPI communication and daisy-chaining of multiple devices, allowing several expanders to share a single SPI chip-select in dense I/O designs.
Performance scales with supply voltage: according to the Texas Instruments datasheet, the TXE8124-Q1 supports a 10MHz SPI clock when VCC is 3.3V to 5.5V and 5MHz when VCC is 1.65V to 5.5V. This voltage-flexible operation allows direct interfacing with 1.8V, 2.5V, 3.3V, and 5V logic domains without level translation in many systems.
Typical applications include automotive body control modules, gateway ECUs, and infotainment boards that need additional GPIO for switches, push-buttons, sensors, LEDs, fans, and relay drivers when the host processor has exhausted its native GPIO. Daisy-chaining suits seat-control modules and door zones where dozens of switches must share one SPI port.
When designing with this device, plan daisy-chain timing budgets around the 10MHz maximum clock and account for the added shift-register latency per cascaded device; also verify the interrupt output is polled or serviced before the register state can change again.
This page synthesizes verified distributor and manufacturer data with drop-in alternatives, comparison tables, and practical design notes not found in the manufacturer datasheet, giving engineers a single citable reference.
Drop-in-Alternativen für TXE8124-Q1 – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
TXE8124
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
TXE8116-Q1
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
TXE8116
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
PTXE8124QDGSRQ1
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
TXE8124-Q1 Technische Daten
| Funktion | 24-bit SPI bus I/O expander |
| Supply Voltage Range | 1.65 V to 5.5 V |
| SPI Clock Speed | 10 MHz (VCC 3.3 V to 5.5 V); 5 MHz (VCC 1.65 V to 5.5 V) |
| Schnittstelle | 4-wire SPI (point-to-point and daisy-chain) |
| Number of GPIO | 24 |
| Interrupt Output | Yes |
| Reset Input | Yes |
| I/O Configuration Registers | Yes |
| Automotive Qualification | AEC-Q100 qualified (Q1) |
| Gehäuse | VQFN-32 (RHB) |
| Montageart | Surface Mount |
TXE8124-Q1 vqfn-32 (rhb) Pinbelegungsleitfaden
Pinbelegung für TXE8124-Q1 (vqfn-32 (rhb)-Gehäuse). Pin-Nummerierung, Funktionen und Anschlussdiagramme sind im Herstellerdatenblatt definiert. Entnehmen Sie diesem den genauen Footprint und Lötrichtlinien.
Keine detaillierten Pinbelegungsdaten verfügbar für TXE8124-Q1.
Siehe die Datenblatt für die vollständige Pin-Konfiguration.
Typische Anwendungen
TXE8124-Q1 ist geeignet für 6 Anwendungs: Automotive Body Control Modules, Switch and Push-Button Monitoring, LED and Indicator Driving, Fan and Peripheral Control, Sensor and Signal Aggregation, Gateway and Infotainment Boards.
Automotive Body Control Modules
Body control modules aggregate dozens of switch inputs and actuator outputs in a confined space where the host MCU rarely has enough native GPIO. The TXE8124-Q1 adds 24 configurable channels over a four-wire SPI bus, and its AEC-Q100 qualification makes it suitable for the automotive temperature and reliability environment. The dedicated interrupt output (INT) immediately flags any input state change, so the MCU does not need to poll 24 pins continuously, and the reset input allows rapid recovery to a defined state after a fault. Daisy-chaining lets a single chip-select manage multiple expanders across door, seat, and lighting zones, keeping wiring harness complexity low while maintaining deterministic response times.
Empfohlen
Switch and Push-Button Monitoring
Human-machine interface panels in vehicles and industrial equipment often monitor large arrays of switches, rotary selectors, and push-buttons. The TXE8124-Q1 can be configured so its 24 channels act as inputs, with I/O configuration registers defining polarity and mode per pin. State changes assert the interrupt output, which wakes the host MCU from low-power idle rather than requiring periodic polling of the SPI bus. Running at 10MHz SPI from a 3.3V to 5.5V rail, a full 24-bit register read completes in a few microseconds, so even fast key presses are captured reliably. The 1.65V to 5.5V supply range lets the expander share the logic rail of whichever MCU family is used.
Empfohlen
LED and Indicator Driving
Status indicators, backlighting zones, and telltale LEDs frequently exhaust a processor's output pins. The TXE8124-Q1 provides 24 output-configurable GPIO channels whose states are set through SPI register writes, allowing the host to update entire lighting patterns with a single 24-bit transaction at up to 10MHz. Daisy-chaining expands this to 48, 72, or more outputs while consuming only one chip-select, which suits instrument clusters and overhead console lighting in automotive cabins. Because the part is AEC-Q100 qualified, it meets automotive reliability requirements. Designers should verify per-pin current limits against LED drive requirements and use external transistors where higher currents are needed.
Empfohlen
Fan and Peripheral Control
Processor boards with limited GPIO often need extra control lines for fan enables, relay drivers, module power switches, and status sensing. Mouser's product overview explicitly identifies fans among the loads the TXE8124 I/O Expanders were designed to support. The TXE8124-Q1 supplies the additional output channels over SPI, while input channels can read tachometer or fault-flag feedback. The interrupt output can signal fault conditions without host polling, improving system responsiveness and fault logging. Its 1.65V to 5.5V operation matches both low-voltage server logic and 5V industrial controllers, and the reset input provides a clean known state at power-up of the peripheral section.
Empfohlen
Sensor and Signal Aggregation
Distributed sensing nodes - door ajar switches, fluid-level floats, limit switches, occupancy inputs - frequently generate more discrete signals than an ECU can absorb. The TXE8124-Q1 aggregates up to 24 such inputs and reports them over SPI with deterministic timing; a full 24-bit status read at 10MHz takes only a few microseconds. In daisy-chained configurations, one SPI port from the MCU covers multiple expander sites, cutting connector and harness cost in distributed installations. Input polarity and pull configuration are controlled by the I/O configuration registers, allowing mixed sensor types on one device. AEC-Q100 qualification supports under-hood and chassis-mounted installations where temperatures are elevated.
Empfohlen
Gateway and Infotainment Boards
Automotive gateway ECUs and infotainment head units interconnect many domains and often run out of GPIO for wake inputs, configuration straps, LED indicators, and board-revision strapping. The TXE8124-Q1 adds 24 flexible channels on the SPI bus already present for other peripherals, preserving scarce I2C and CAN resources. The interrupt output connects to the processor's wake or IRQ line so strap and switch changes are serviced promptly, and the reset input enables full re-initialization during OTA update or safe-state transitions. The wide 1.65V to 5.5V supply range allows placement in either the low-voltage SoC domain or the 5V wake domain of the board.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für TXE8124-Q1 – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | TXE8124 | TXE8116-Q1 | TXE8116 | PTXE8124QDGSRQ1 |
|---|---|---|---|---|---|
| Package | VQFN-32 (RHB) | VQFN-32 (RHB) - same | VQFN-32 (RHB) - same | VQFN-32 (RHB) - same | VSSOP-16 (DGS) - smaller package |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| I/O Channels | 24 | 24 | 16 | 16 | 24 |
| Supply Voltage | 1.65 V to 5.5 V | 1.65 V to 5.5 V | 1.65 V to 5.5 V | 1.65 V to 5.5 V | 1.65 V to 5.5 V |
| Interrupt Output | Yes | Yes | Yes | Yes | Yes |
| Reset Input | Yes | Yes | Yes | Yes | Yes |
| Automotive Grade (AEC-Q100) | Yes | No (commercial) | Yes | No (commercial) | Yes |
Wichtigste Unterscheidungsmerkmale
- Full 24-bit I/O expansion in one device (vs. TXE8116-Q1)
- AEC-Q100 automotive qualification (vs. TXE8124 (commercial))
- Higher-speed SPI than I2C expanders (vs. PTXE8124QDGSRQ1)
Designhinweise
The SPI clock ceiling depends on supply: 10MHz is supported only when VCC is 3.3V to 5.5V, while 1.65V to 2.5V systems are limited to 5MHz per the TI datasheet. In daisy-chained configurations, each additional device adds a full 24-bit shift latency, so total update time equals bit count times chain length divided by the clock rate - compute this budget before fixing chain depth. Keep SCLK traces short and match trace lengths across the chain to avoid clock-skew sampling errors at 10MHz.
The TXE8124-Q1 operates across 1.65V to 5.5V, but the achievable SPI speed tracks VCC. Design the power tree so that if the rail can dip below 3.3V during crank or load-dump events, firmware must tolerate the 5MHz limit. Decouple VCC with a 100nF ceramic capacitor placed within a few millimeters of the supply pin per standard TI expander layout practice. Verify per-pin source/sink current limits in the datasheet before driving LEDs or relays directly from GPIO.
The RST (reset) input exists to return the entire register map to defaults - do not leave it floating in noisy automotive environments; tie it to a supervisor or MCU GPIO with defined pull. Similarly, ensure the INT output is masked or serviced appropriately, since an unserviced interrupt with rapidly changing inputs can spam the host IRQ line. When substituting the VSSOP-16 PTXE8124QDGSRQ1 package variant, note that the reduced pin count changes the land pattern and available pin functions - this is not a footprint swap.
Compliance-Informationen
AEC-Q100 qualification implied by the -Q1 designation and TI's 'Automotive' family classification. Detailed RoHS/REACH status should be confirmed on the TI product page for the specific orderable part (PTXE8124QWRHBRQ1).
