Overview
The PCA9518PWT, produced by Texas Instruments, is a 5-channel bidirectional I2C/SMBus buffer/hub designed to expand and buffer I2C and SMBus signals. This device operates within a voltage range of 3 V to 3.6 V and supports both standard-mode and fast-mode I2C devices, as well as SMBus devices. It is particularly useful in systems where the I2C bus needs to be extended beyond the standard 400 pF capacitance limit, allowing for the creation of larger, more complex I2C networks without degrading system performance.
Key Specifications
| Parameter | Value |
|---|---|
| Operating Voltage Range | 3 V to 3.6 V |
| I2C Bus Frequency | Up to 400 kHz |
| Number of Channels | 5 |
| Package Type | TSSOP (PW) with 20 pins |
| Bus Capacitance Limit | 400 pF per segment |
| ESD Protection | 2000-V Human-Body Model, 200-V Machine Model, 1000-V Charged-Device Model |
| I2C Compatibility | Standard-mode, Fast-mode, and SMBus compatible |
| Expansion Capability | Supports inter-hub expansion through 4-wire bus |
Key Features
- 5-channel bidirectional I2C/SMBus buffer/hub
- Active-high individual repeater enable inputs
- Open-drain input/outputs
- Lockup-free operation
- Powered-off high-impedance I2C pins
- Supports multiple masters
- Expansion capability through 4-wire inter-hub bus
- 5-V tolerant I2C and enable input pins
- Internal power-on-reset circuit (VPOR)
Applications
The PCA9518PWT is suitable for a variety of applications where I2C or SMBus signal extension is necessary. These include industrial control systems, automotive systems, consumer electronics, and any system requiring the expansion of I2C/SMBus buses beyond their standard capacitance limits. It is particularly useful in distributed systems where multiple masters and slaves need to communicate over extended distances.
Q & A
- What is the operating voltage range of the PCA9518PWT?
The PCA9518PWT operates within a voltage range of 3 V to 3.6 V. - What is the maximum I2C bus frequency supported by the PCA9518PWT?
The PCA9518PWT supports I2C bus frequencies up to 400 kHz. - How many channels does the PCA9518PWT have?
The PCA9518PWT has 5 channels. - What type of package is the PCA9518PWT available in?
The PCA9518PWT is available in a TSSOP (PW) package with 20 pins. - What is the bus capacitance limit per segment for the PCA9518PWT?
The bus capacitance limit per segment is 400 pF. - Does the PCA9518PWT support multiple masters on the I2C bus?
Yes, the PCA9518PWT supports multiple masters on the I2C bus. - How does the PCA9518PWT handle ESD protection?
The PCA9518PWT provides ESD protection exceeding 2000-V Human-Body Model, 200-V Machine Model, and 1000-V Charged-Device Model. - Can the PCA9518PWT be used in systems with both standard-mode and fast-mode I2C devices?
Yes, the PCA9518PWT is compatible with both standard-mode and fast-mode I2C devices, as well as SMBus devices. - How does the PCA9518PWT support inter-hub expansion?
The PCA9518PWT supports inter-hub expansion through a 4-wire bus between hubs. - Is the PCA9518PWT suitable for use in safety-critical applications?
No, the PCA9518PWT is not recommended for use in safety-critical applications. Refer to the datasheet for detailed disclaimers and warnings.
