Overview
The PCA9540BDP/DG,118, produced by NXP USA Inc., is a 2-channel I2C-bus multiplexer that enables the expansion of an I2C-bus in a system. This device is a 1-of-2 bidirectional translating multiplexer, controlled via the I2C-bus, allowing the SCL/SDA upstream pair to fan out to two SCx/SDx downstream pairs or channels. Only one SCx/SDx channel is selected at a time, determined by the contents of the programmable control register. This multiplexer is particularly useful in systems where multiple devices share the same I2C-bus, providing a flexible and efficient way to manage communication between these devices.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply Voltage (VDD) | 2.3 | 5.5 | V | ||
| Supply Current (IDD) | VDD = 3.6 V, no load, fSCL = 100 kHz | - | 50 | 100 | μA |
| Standby Current (Istb) | VDD = 3.6 V, no load, fSCL = 0 kHz | - | 0.1 | 1 | μA |
| Power-on Reset Voltage (VPOR) | 1.6 | 2.1 | V | ||
| Clock Frequency (fSCL) | 0 | 400 | kHz | ||
| Package Style | TSSOP-8, SO8, XSON8 | ||||
| Mounting Method | Surface Mount |
Key Features
- 1-of-2 bidirectional translating multiplexer
- I2C-bus interface logic; compatible with SMBus standards
- Channel selection via I2C-bus
- Power up with all multiplexer channels deselected
- Low Ron switches
- Allows voltage level translation between 1.8 V, 2.5 V, 3.3 V, and 5 V buses
- No glitch on power-up
- Supports hot insertion
- Low standby current
- 5 V tolerant inputs
- ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per JESD22-A115, and 1000 V CDM per JESD22-C101
- Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
Applications
The PCA9540BDP/DG,118 is suitable for a variety of applications where I2C-bus expansion is necessary. These include:
- Embedded systems requiring multiple I2C devices
- Industrial control systems with multiple sensors and actuators
- Automotive systems needing to manage multiple I2C devices
- Consumer electronics such as smart home devices and appliances
- Medical devices requiring precise I2C communication management
Q & A
- What is the PCA9540BDP/DG,118 used for?
The PCA9540BDP/DG,118 is a 2-channel I2C-bus multiplexer used to expand the I2C-bus in a system, allowing multiple devices to share the same bus.
- What are the supported supply voltage ranges for the PCA9540BDP/DG,118?
The device supports a supply voltage range of 2.3 V to 5.5 V.
- What is the maximum clock frequency supported by the PCA9540BDP/DG,118?
The maximum clock frequency supported is 400 kHz.
- Does the PCA9540BDP/DG,118 support voltage level translation?
Yes, it allows voltage level translation between 1.8 V, 2.5 V, 3.3 V, and 5 V buses.
- What types of packages are available for the PCA9540BDP/DG,118?
The device is available in TSSOP-8, SO8, and XSON8 packages.
- Is the PCA9540BDP/DG,118 ESD protected?
Yes, it has ESD protection exceeding 2000 V HBM per JESD22-A114, 200 V MM per JESD22-A115, and 1000 V CDM per JESD22-C101.
- Does the PCA9540BDP/DG,118 support hot insertion?
Yes, it supports hot insertion.
- What is the standby current of the PCA9540BDP/DG,118?
The standby current is typically 0.1 μA.
- Is the PCA9540BDP/DG,118 compatible with SMBus standards?
Yes, it is compatible with SMBus standards.
- How is channel selection done on the PCA9540BDP/DG,118?
Channel selection is done via the I2C-bus by programming the control register.
