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PCA9548ADW

Name: PCA9548ADW
Rating: 4.7 (12 reviews)

IC INTERFACE SPECIALIZED 24SOIC

製造商
製造商。部分 #PCA9548ADW
包 24-SOIC (0.295, 7.50mm Width)
資料表 PCA9548ADW DataSheet
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規格

Supplier	Rochester Electronics, LLC,Texas Instruments
Package	Bulk,Tube
ProductStatus	Active
Applications	Translating Switch
Interface	I²C, SMBus
Voltage-Supply	2.3V ~ 5.5V
Package/Case	24-SOIC (0.295, 7.50mm Width)
SupplierDevicePackage	24-SOIC

概述

Description

PCA9548ADW is NXP’s PCA9548A 8-channel I2C switch/multiplexer in the DW package. It lets one I2C master drive up to eight independent downstream I2C buses, isolating each bus to avoid address conflicts or noise.
Key points
- Upstream: connects to the master I2C bus; downstream: eight separate buses (channels 0–7).
- Address: base 0x70 and A0–A2 pins select 0x70–0x77.
- Operation: send a single 8-bit control byte to enable channels (bit N = 1 enables channel N). Multiple channels may be active simultaneously.
- Use: after selecting channels, you can access devices on those channels as if they were directly on the bus.
- Electrical: Vcc = 2.3–5.5 V; I2C speeds up to 400 kHz (fast-mode).
- Notes: no data buffer; switching channels is done by writing a new control byte. Cascading multiple devices is possible for more channels.
Common use: expand I2C with multiple devices sharing addresses, such as sensors or EEPROMs, without changing their hardware addresses.

Features

PCA9548ADW is an 8-channel I2C bus switch (I2C multiplexer) from NXP.
Key features:
- 8 downstream I2C buses, switchable independently from a single master.
- Isolates disabled channels to prevent cross-talk and address conflicts on downstream devices.
- Control via one 8-bit register; each bit enables one channel (0–7). Base I2C address is 0x70 with A0–A2 selectables (0x70–0x77).
- Supports standard-mode and fast-mode I2C (up to 400 kHz).
- Single-supply operation: Vcc typically 1.65–5.5 V (all channels share the same supply; downstream devices must be compatible).
- No level-shifting between master and downstream buses; ensure compatible logic levels.
- Useful for coexisting devices with identical addresses and for expanding I2C topology without conflicts.
- Available in compact DW package variants.

Package

The PCA9548ADW is supplied in a 20-pin TSSOP package (TSSOP-20, NXP package code "DW").

Pinout

PCA9548ADW is supplied in a 24-pin DW (SOIC/TSSOP style) package. Functionally it is an 8‑channel I2C switch with these pins:
- VCC and GND: power supply.
- SDA and SCL: upstream (master-side) I2C data and clock.
- SDA0–SDA7 and SCL0–SCL7: eight downstream (channel) data/clock pairs (16 pins).
- A0, A1, A2: hardware I2C address select inputs.
- RESET: device reset input.
In short: 24 pins total, providing power, one master I2C port, eight bidirectional I2C channel pairs, three address-select pins, and a reset pin.

Manufacturer

The PCA9548ADW is manufactured by NXP Semiconductors (originally Philips Semiconductors). NXP is a global semiconductor company that designs and manufactures mixed-signal and standard integrated circuits for automotive, industrial, IoT, mobile and communications applications.

Application

PCA9548ADW is an 8-channel I2C switch/multiplexer. Applications: expand the I2C bus while avoiding address conflicts by routing devices to separate channels; isolate noisy/high-capacitance peripherals to improve bus performance; enable selective power-down or hot-swapping of sections; organize multi-sensor arrays (temp/humidity/accel/MEMS, ADCs), EEPROMs, displays, and other I2C peripherals in embedded systems, wearables, automotive, and industrial electronics.

Equivalent

Direct drop‑in equivalents: Texas Instruments TCA9548A. Other NXP PCA9548A family variants (different packages/markings) also match PCA9548ADW. Analog alternatives (not exact I2C‑address/pin compatible) include Analog Devices ADG728 / ADG704 8‑channel muxes. For exact replacement confirm package, power and I2C address specs.