Overview
The PCA9641PW118, produced by NXP USA Inc., is a 2-to-1 I²C-bus master demultiplexer with an arbiter function. This component is designed for high reliability in dual master I²C-bus applications, ensuring correct system operation even when two I²C-bus masters issue commands simultaneously. The PCA9641PW118 is particularly useful in systems that require robust and reliable I²C communication, such as in automotive, industrial, and consumer electronics.
Key Specifications
| Parameter | Value |
|---|---|
| Package Type | TSSOP16, HVQFN16 |
| Operating Power Supply Voltage | 2.3 V to 3.6 V |
| I/O Pin Tolerance | 3.6 V |
| Clock Frequency | Up to 1 MHz |
| ESD Protection | Exceeds 6000 V HBM per JESD22-A114 and 1000 V CDM per JESD22-C101 |
| Latch-up Testing | Exceeds 100 mA per JEDEC Standard JESD78 |
| Address Decoding | Up to 112 addresses |
| Reset Input | Active LOW reset input |
| Temperature Range | -40°C to +85°C |
Key Features
- 2-to-1 bidirectional master selector
- Channel selection via I²C-bus
- I²C-bus interface logic compatible with SMBus standards
- Arbiter function to manage multiple masters
- Queueing of requests for downstream bus access
- Software reset capability
- Interrupt outputs to indicate master control status
- No internal pull-up resistors; external pull-up resistors required
Applications
- High reliability systems with dual masters
- Gatekeeper multiplexer on long single bus
- Bus initialization/recovery for slave devices without hardware reset
- Systems where masters without arbitration logic need to share resources
Q & A
- What is the PCA9641PW118 used for?
The PCA9641PW118 is used as a 2-to-1 I²C-bus master demultiplexer with an arbiter function, ensuring reliable operation in dual master I²C-bus applications. - What are the package options for the PCA9641PW118?
The PCA9641PW118 is available in TSSOP16 and HVQFN16 packages. - What is the operating voltage range of the PCA9641PW118?
The operating voltage range is from 2.3 V to 3.6 V. - What is the maximum clock frequency supported by the PCA9641PW118?
The maximum clock frequency is up to 1 MHz. - Does the PCA9641PW118 have built-in pull-up resistors?
No, the PCA9641PW118 does not have built-in pull-up resistors; external pull-up resistors are required. - How does the arbiter function work in the PCA9641PW118?
The arbiter function selects one master to control the I²C-bus while the other master waits, ensuring no conflicts or lock-ups. - What is the temperature range for the PCA9641PW118?
The temperature range is from -40°C to +85°C. - Can the PCA9641PW118 handle multiple transactions on the downstream bus?
Yes, the PCA9641PW118 allows for queued requests and reserves time for multiple transactions on the downstream bus. - How does the PCA9641PW118 handle ESD protection?
The PCA9641PW118 exceeds 6000 V HBM per JESD22-A114 and 1000 V CDM per JESD22-C101 for ESD protection. - What kind of reset options are available for the PCA9641PW118?
The PCA9641PW118 has an active LOW reset input and supports software reset.
