Overview
The PCA9641PWJ, 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 arbiter function selects a winning master and allows it to work uninterrupted, while the losing master gains control of the I2C-bus after the winning master has finished. This device also supports queued requests and resolves race conditions efficiently.
Key Specifications
| Specification | Value |
|---|---|
| Operating Power Supply Voltage | 2.3 V to 3.6 V |
| I/O Pin Tolerance | 3.6 V |
| I2C-Bus Clock Frequency | Up to 1 MHz |
| ESD Protection | 6000 V HBM, 1000 V CDM |
| Latch-up Testing | Exceeds 100 mA (JEDEC Standard JESD78) |
| Package Types | TSSOP16, HVQFN16 |
| Operating Temperature Range | -40°C to +85°C |
| Slave Address Capability | Decodes 112 addresses |
Key Features
- 2-to-1 bidirectional master selector
- Channel selection via I2C-bus
- I2C-bus interface logic compatible with SMBus standards
- Active LOW reset input for initialization
- Internal Power-On Reset (POR)
- External pull-up resistors for bus voltage level control
- Support for queued requests and resolution of race conditions
Applications
- High reliability systems with dual masters
- Gatekeeper multiplexer on long single bus
- Bus initialization/recovery for slave devices without hardware reset
- Allows masters without arbitration logic to share resources
Q & A
- What is the primary function of the PCA9641PWJ?
The PCA9641PWJ is a 2-to-1 I2C-bus master demultiplexer with an arbiter function, designed to manage dual master I2C-bus applications. - What is the operating power supply voltage range of the PCA9641PWJ?
The operating power supply voltage range is 2.3 V to 3.6 V. - What is the maximum I2C-bus clock frequency supported by the PCA9641PWJ?
The maximum I2C-bus clock frequency is up to 1 MHz. - What type of ESD protection does the PCA9641PWJ offer?
The PCA9641PWJ offers ESD protection exceeding 6000 V HBM and 1000 V CDM. - What are the package types available for the PCA9641PWJ?
The package types available are TSSOP16 and HVQFN16. - What is the operating temperature range of the PCA9641PWJ?
The operating temperature range is -40°C to +85°C. - How many slave addresses can the PCA9641PWJ decode?
The PCA9641PWJ can decode 112 addresses. - What is the purpose of the arbiter function in the PCA9641PWJ?
The arbiter function selects a winning master when two masters issue commands simultaneously, ensuring uninterrupted operation and resolving race conditions. - Can the PCA9641PWJ support queued requests?
Yes, the PCA9641PWJ supports queued requests where a master can request the downstream bus while the other master has control. - What is the significance of the active LOW reset input in the PCA9641PWJ?
The active LOW reset input allows the device to be initialized and reset to its default state.
