Overview
The PCA9540BD,112, produced by NXP USA Inc., is a 1-of-2 bidirectional translating multiplexer controlled via the I²C-bus. This device allows the SCL/SDA upstream pair to fan out to two SCx/SDx downstream pairs, or channels, enabling communication between different voltage levels without additional protection. The PCA9540B is particularly useful in systems where multiple I²C devices need to be connected to a single I²C bus, and it supports voltage translation between 1.8 V, 2.5 V, 3.3 V, and 5 V parts.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| VDD Supply Voltage | - | 2.3 | - | 5.5 | V |
| IDD Supply Current (Operating Mode) | VDD = 5.5 V; no load; VI = VDD or VSS; fSCL = 100 kHz | - | 65 | 100 | μA |
| Istb Standby Current | Standby mode; VDD = 5.5 V; no load; VI = VDD or VSS | - | 0.3 | 1 | μA |
| VPOR Power-On Reset Voltage | No load; VI = VDD or VSS | 1.6 | - | 2.1 | V |
| VIL LOW-level Input Voltage | - | -0.5 | - | 0.3VDD | V |
| Package Options | - | SO8, TSSOP8, XSON8 | - | - | - |
Key Features
- Bidirectional translating multiplexer controlled via the I²C-bus.
- Supports voltage translation between 1.8 V, 2.5 V, 3.3 V, and 5 V parts.
- Power-on reset function initializes the device to a default state with no channels selected.
- Low standby current to minimize power consumption.
- AEC-Q100 compliant for automotive applications (PCA9540BDP/Q900).
- Available in SO8, TSSOP8, and XSON8 packages.
Applications
- Automotive systems requiring multiple I²C devices to be connected to a single I²C bus.
- Industrial control systems where voltage translation is necessary.
- Consumer electronics with multiple I²C peripherals.
- Medical devices requiring reliable and low-power I²C communication.
Q & A
- What is the PCA9540BD,112 used for? The PCA9540BD,112 is used as a 1-of-2 bidirectional translating multiplexer to connect multiple I²C devices to a single I²C bus, enabling communication between different voltage levels.
- What voltage levels does the PCA9540BD,112 support? It supports voltage translation between 1.8 V, 2.5 V, 3.3 V, and 5 V parts.
- What is the power-on reset function of the PCA9540BD,112? The power-on reset function initializes the device to a default state with no channels selected when power is applied.
- What are the package options for the PCA9540BD,112? The device is available in SO8, TSSOP8, and XSON8 packages.
- Is the PCA9540BD,112 AEC-Q100 compliant? Yes, the PCA9540BDP/Q900 variant is AEC-Q100 compliant for automotive applications.
- What is the typical standby current of the PCA9540BD,112? The typical standby current is 0.3 μA.
- How does the PCA9540BD,112 handle different bus voltages? The pass gate transistors are constructed to allow the VDD pin to limit the maximum high voltage passed, enabling communication between different voltage levels.
- What is the thermal resistance of the PCA9540BD,112 in different packages? The thermal resistance from junction to ambient is 158 °C/W for SO8, 120 °C/W for TSSOP8, and specified for other packages accordingly.
- Can the PCA9540BD,112 be used in industrial control systems? Yes, it can be used in industrial control systems where voltage translation is necessary.
- How do I reset the PCA9540BD,112? To reset the device, VDD must be lowered to 0.2 V for at least 5 μs.
