PCA9615DPJ - 2-Ch Differential I2C-Bus Buffer 400kHz | NXP
N.º de pieza: PCA9615DPJ ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $0 | $0,00 |
| 10 | $0 | $0,00 |
| 100 | $0 | $0,00 |
| 500 | $0 | $0,00 |
| 1.000 | $0 | $0,00 |
PCA9615DPJ Descripción general
An I2C-bus buffer, also called a bus repeater or redriver, is an interface IC that extends the reach and robustness of a serial bus by regenerating signals between bus segments. Within the interface IC hierarchy, the PCA9615 belongs to the signal buffers, repeaters and splitters class of communication interface devices, positioned above simple level translators because it also provides electrical isolation from noise using differential signaling.
Key features include the differential dI2C physical layer that is fully transparent to the SMBus/I2C protocol layer, multipoint (multi-drop) operation supporting multiple buffered nodes on one differential cable, and hot-swap logic that allows boards to be inserted into or removed from a live backplane without corrupting ongoing bus transactions. Because the bus is differential, common-mode noise picked up on long or noisy cable runs is rejected at the receiving buffer, which dramatically extends achievable bus length compared to single-ended I2C.
Technically, the PCA9615 consists of two single-ended-to-differential driver channels, one for the serial clock (SCL) and one for the serial data (SDA). The part supports Fast-mode Plus speeds per the DigiKey listing (400 kHz) and interoperates with standard I2C masters and slaves because the dI2C layer is invisible to the protocol layer. The enable (EN) pin permits tri-stating the differential drivers for multipoint contention control.
Typical applications include extending I2C between boards in telecom or industrial backplanes, connecting sensors across electrically noisy factory floors, and linking subsystems in automotive or server equipment where ground potential differences and motor noise would defeat single-ended buses.
For design, keep the single-ended sides short and treat the differential pair as a controlled-impedance twisted pair or PCB diff pair over the long run; enable the hot-swap function when live insertion is expected.
This page synthesizes distributor pricing context, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Alternativas directas para PCA9615DPJ — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con PCA9615DPJ (mismo factor de forma y huella) — difiere en Function, Hot-Swap Logic, Number of Channels, Package.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
PCA9615DPZ
✅ Sustitución directa✓ En stock
$1.78 / unidad
Ver hoja de datos →PCA9615DPJ Especificaciones
| Función | 2-channel multipoint Fast-mode Plus differential I2C-bus buffer with hot-swap logic |
| Number of Channels | 2 (SCL and SDA) |
| Bus Speed | 400 kHz |
| Signaling Type | Single-ended to differential (dI2C) |
| Protocol Compatibility | SMBus / I2C (differential layer transparent to protocol) |
| Hot-Swap Logic | Yes |
| Multipoint Operation | Yes (multi-drop) |
| Encapsulado | 10-TSSOP / 10-TFSOP, 0.118 in (3.00 mm) width |
| Tipo de montaje | Surface Mount |
| Estado RoHS | Compliant |
Guía de configuración de pines de PCA9615DPJ 10-tssop / 10-tfsop, 0.118 in (3.00 mm) width
Configuración de pines para PCA9615DPJ (encapsulado 10-tssop / 10-tfsop, 0.118 in (3.00 mm) width). La numeración de pines, las funciones y los diagramas de conexión se definen en la hoja de datos del fabricante. Consúltela para conocer el footprint exacto y las directrices de soldadura.
No hay datos detallados de patillaje disponibles para PCA9615DPJ.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
PCA9615DPJ es adecuado para 6 aplicacións: Industrial Backplane I2C Extension, Telecom Equipment Shelf Management, Remote Sensor Nodes in Noisy Factory Floors, Server and Storage Chassis Monitoring, Automotive Body Electronics Networks, Test and Measurement Instrument Interconnect.
Industrial Backplane I2C Extension
In industrial chassis where multiple cards communicate over a shared I2C bus, single-ended signaling fails due to ground offset and motor/inverter noise. The PCA9615DPJ fits because its differential dI2C physical layer rejects common-mode noise across the backplane cable, and its multipoint architecture lets every card hang off one differential trunk. Its hot-swap logic means a card can be inserted into a powered chassis without corrupting an in-progress transaction, since the single-ended side only connects after local power stabilizes. Designers typically keep the single-ended SCL/SDA traces under a few centimeters from the local master or slave to the buffer, then run a twisted differential pair across the backplane, achieving reliable communication at 400 kHz where plain I2C would be limited to a fraction of that distance.
Recomendado
Telecom Equipment Shelf Management
Telecom shelves use I2C for power-supply monitoring, fan control, and FRU EEPROM reads across long distances and noisy power planes. The PCA9615DPJ is suited to this because the 400 kHz Fm+ data rate is fast enough for polling dozens of PMBus-style sensors while the differential pair traverses the full shelf height without picking up switching-regulator noise. The hot-swap logic is decisive here: field-replaceable units are inserted while the shelf stays live, and the PCA9615 prevents the newly inserted card's half-charged bus capacitance from stalling an ongoing management transaction. Each FRU card places one PCA9615DPJ between its local management microcontroller and the differential shelf bus, and the EN pin releases the cable when the card is unpowered, avoiding contention.
Recomendado
Remote Sensor Nodes in Noisy Factory Floors
Factories run I2C sensor clusters (temperature, pressure, proximity) at distances from the controller that single-ended I2C cannot survive near VFDs, welders, and high-current cabling. The PCA9615DPJ addresses this directly: converting to dI2C differential signaling at the controller and again at the sensor cluster gives common-mode noise rejection over the entire run, at 400 kHz throughput sufficient for periodic sensor sampling. A buffer pair per segment is inexpensive relative to the cabling cost savings, and because the differential layer is transparent to the I2C protocol, standard Arduino/STM32/NXP MCU I2C peripherals and sensor drivers work unmodified. The multipoint capability further lets several sensor nodes share one differential trunk instead of one pair per node, cutting wire count.
Recomendado
Server and Storage Chassis Monitoring
Server and storage enclosures concentrate dozens of hot-swap drives, PSU modules, and fan trays on shared management I2C. The PCA9615DPJ matches this environment on three counts: differential signaling tolerates the high ground bounce of high-current 12 V distribution; multipoint support lets all trays share one differential management pair; and hot-swap logic allows a drive or PSU to be pulled and replaced without hanging the bus master during an open transaction. Designs place a PCA9615DPJ on every field-replaceable unit, with the differential pair routed through the midplane connector. Because the dI2C layer needs no protocol awareness, existing BMC firmware and sensor drivers operate unchanged, cutting qualification effort for the enclosure designer.
Recomendado
Automotive Body Electronics Networks
Automotive body modules use I2C for lighting, window, and sensor subsystems over loom distances exposed to load-dump transients, alternator ripple, and ground lifts between modules. The PCA9615DPJ's differential dI2C layer provides the common-mode rejection that single-ended I2C lacks in this environment, sustaining 400 kHz communication across several meters of vehicle wiring. The hot-swap function also protects against bus glitches when modules are connected during assembly diagnostics with the battery live. Designers should place the buffer close to the connector on both ends and use twisted-pair wiring for the differential run; supply rails and ESD treatment must follow the automotive module's own architecture and NXP datasheet absolute maximum ratings before design-in.
Recomendado
Test and Measurement Instrument Interconnect
Bench instruments and modular test systems frequently move I2C between front-end boards and the digital controller across a ground plane that carries fast switching currents, corrupting single-ended I2C beyond a few tens of centimeters. The PCA9615DPJ solves this by carrying SCL and SDA differentially across the instrument interconnect, rejecting the switching noise common to both wires. At 400 kHz it comfortably services configuration and telemetry traffic to ADC/DAC front-ends, and the hot-swap logic supports live connection of plug-in measurement modules. Because the dI2C layer is protocol-transparent, calibration routines and instrument firmware that use stock I2C drivers run without modification, and the multipoint capability supports stacking several instrument cards on a single differential bus.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para PCA9615DPJ — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | PCA9615DP |
|---|---|---|
| Package | 10-TSSOP (DPJ), 3.00 mm width | 10-TSSOP (DPJ) - same |
| Brand | NXP Semiconductors | NXP Semiconductors |
| Channels | 2 (SCL + SDA) | 2 (SCL + SDA) |
| Bus Speed | 400 kHz (Fm+) | 400 kHz (Fm+) |
| Signaling | Differential dI2C | Differential dI2C |
| Hot-Swap Logic | Yes | Yes |
| Multipoint Support | Yes | Yes |
| Lifecycle Status | Active | Discontinued / replacement (see PCA9615DPJ) |
Diferenciadores clave
- True differential physical layer (frente a PCA9600DP,118)
- Hot-swap logic for live backplanes (frente a MAX4871/MAX4873 repeaters)
- Multipoint multi-drop trunk support (frente a PCA9600DP,118)
Notas de diseño
Keep the single-ended SCL/SDA side of each PCA9615DPJ as short as possible - ideally under 5 cm from the local master or slave to the buffer pins. The long, noise-exposed portion of the bus must be the differential dI2C pair only. Route the differential pair as a tightly coupled pair (twisted pair in cable, or length-matched PCB traces with a solid reference plane) to preserve common-mode noise rejection, which is the entire reason for choosing a differential buffer.
Do not mix single-ended extensions (rise-time accelerators, passive pull-up increases) on the differential segment - the dI2C pair is a driven differential link, not an open-drain wired-AND bus. For multipoint trunks, ensure the EN pin of unpowered nodes releases the cable so inactive buffers do not load or contend with the active driver. Confirm VDD(A) and VS rail sequencing and absolute maximum ratings from the official NXP PCA9615 datasheet before finalizing the power tree; these values were not in the captured web data.
Place 100 nF ceramic decoupling capacitors within 2 mm of both supply pins (VDD(A) and VS), plus bulk capacitance per board. During live-insertion applications, sequence the hot-swap side so the local supply stabilizes before the bus connects - the built-in hot-swap logic handles this, but only if the local decoupling prevents supply dip during card insertion. Estimating stub lengths: any unterminated single-ended stub on the differential side will radiate and defeat noise immunity; all long runs must be differential.
Información de cumplimiento
RoHS compliance and lead-free status inferred from distributor listings (RoHS-compliant ordering suffix DPJ). REACH, halogen-free and conflict minerals status not stated in captured data - verify from NXP product page.
