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PCA9544ARGYR

Name: PCA9544ARGYR
Rating: 4.7 (12 reviews)

IC INTERFACE SPECIALIZED 20VQFN

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規格

Part Status	Active
Base Product Number	PCA9544
Applications	Translating Switch
Interface	I2C, SMBus
Voltage - Supply	2.3V ~ 5.5V
Package	20-VFQFN Exposed Pad
Supplier Device Package	20-VQFN (3.5x4.5)
Mounting Type	Surface Mount
Packaging	Cut Tape (CT), Tape & Reel (TR)

概述

Description

PCA9544ARGYR is NXP’s PCA9544A four-channel I2C switch/multiplexer in the ARGYR package (RoHS, tape-and-reel). It sits between an I2C master and up to four downstream I2C buses.
How it works:
- You write a control byte to the device’s I2C address to enable one or more channels (CH0–CH3).
- An enabled channel connects its downstream SCL/SDA to the upstream bus; a disabled channel is isolated.
- Multiple channels may be enabled simultaneously, providing separate sub-buses to avoid address conflicts and reduce bus capacitance.
Key details:
- Upstream bus is shared; each channel has its own downstream pair.
- I2C address base is 0x70 with A0–A2 pins selecting 0–7 (so 0x70–0x77).
- Supply voltage typically 2.3–5.5V.
Typical use:
- Isolate devices with identical I2C addresses on separate buses.
- Reduce noise/bus loading by partitioning devices.
Packaging note:
- ARGYR indicates a specific physical package/lot code; device functionality remains the same.

Features

PCA9544ARGYR Features (concise):
- 4-channel I2C-bus multiplexer/switch. Allows selecting/isolating four downstream I2C buses from a single master.
- Independent channel enables: any combination of channels can be active simultaneously via a single control byte.
- Enables devices with identical addresses to coexist on separate channels.
- Simple I2C control: write one control byte to set the enabled channels.
- I2C-compatible, supporting standard and fast-mode operation (up to 400 kHz).
- Address selection via A0–A2 pins: device address ranges from 0x70 to 0x77.
- Requires pull-up resistors on each downstream bus.
- Wide operating voltage range and temperature (typical RoHS/lead-free packaging).

Package

PCA9544ARGYR comes in a 16‑pin RoHS‑compliant SOIC package (SOIC-16).

Pinout

- Pin count: 16 pins (16-pin package, e.g., SOIC-16/SSOP-16)
- Function: 4-channel I2C multiplexer/switch (PCA9544A). It allows a single I2C master to access up to four downstream I2C buses by enabling channels 0–3 via an I2C control byte. A0–A2 set the device address; Vcc and GND power the device.

Manufacturer

- Manufacturer: NXP Semiconductors N.V.
- What kind of company: A Dutch multinational semiconductor company (originated from Philips) that designs and manufactures integrated circuits and related components for automotive, industrial, and consumer electronics, among other markets.

Application

An I2C-bus switch (4 channels) that multiplexes and isolates I2C segments. Applications:
- Expand I2C capacity while avoiding address conflicts
- Isolate noisy or high-capacitance devices (sensors, EEPROMs, ADCs) on separate channels
- Improve fault containment by gating channels
- Software-controlled debugging, testing, and hot-swap maintenance
- Enable hierarchical/banked I2C buses in embedded systems