PCA9554
- I2C to Parallel Port Expander
- Open-Drain Active-Low Interrupt Output
- Operating Power-Supply Voltage Range of 2.3 V to 5.5 V
- 5-V Tolerant I/Os
- 400-kHz Fast I2C Bus
- Three Hardware Address Pins Allow up to Eight Devices on the I2C/SMBus
- Input/Output Configuration Register
- Polarity Inversion Register
- Internal Power-On Reset
- Power-Up With All Channels Configured as Inputs
- No Glitch On Power Up
- Latched Outputs With High-Current Drive Maximum Capability for Directly Driving LEDs
- Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
- ESD Protection Exceeds JESD 22
- 2000-V Human-Body Model (A114-A)
- 200-V Machine Model (A115-A)
- 1000-V Charged-Device Model (C101)
INT can be connected to the interrupt input of a microcontroller. By sending an interrupt signal on this line, the remote I/O can inform the microcontroller if there is incoming data on its ports without having to communicate via the I2C bus. Thus, the PCA9554 can remain a simple slave device.
The device’s outputs (latched) have high-current drive capability for directly driving LEDs and low current consumption.
Three hardware pins (A0, A1, and A2) are used to program and vary the fixed I2C address and allow up to eight devices to share the same I2C bus or SMBus.
The PCA9554 is pin-to-pin and I2C address compatible with the PCF8574. However, software changes are required, due to the enhancements in the PCA9554 over the PCF8574.
The PCA9554 and PCA9554A are identical except for their fixed I2C address. This allows for up to 16 of these devices (eight of each) on the same I2C/SMBus.
技術文件
| 重要文件 | 類型 | 標題 | 格式選項 | 下載最新的英文版本 | 日期 | |
|---|---|---|---|---|---|---|
| * | 資料表 | PCA9554 Remote 8-Bit I2C AND SMBus I/O Expander With Interrupt Output and Configuration Registers datasheet (Rev. D) | PDF | HTML | 2021/3/11 | ||
| 應用說明 | Understanding Transient Drive Strength vs. DC Drive Strength in Level-Shifters (Rev. A) | PDF | HTML | 2024/7/3 | |||
| 應用說明 | I2C Dynamic Addressing | 2019/4/25 | ||||
| 應用說明 | Choosing the Correct I2C Device for New Designs | PDF | HTML | 2016/9/7 | |||
| 應用說明 | Understanding the I2C Bus | PDF | HTML | 2015/6/30 | |||
| 應用說明 | Maximum Clock Frequency of I2C Bus Using Repeaters | 2015/5/15 | ||||
| 應用說明 | I2C Bus Pull-Up Resistor Calculation | PDF | HTML | 2015/2/13 |
設計與開發
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I2C-DESIGNER — I2C 設計工具
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| SOIC (DW) | 16 | Ultra Librarian |
| TSSOP (PW) | 16 | Ultra Librarian |
| TVSOP (DGV) | 16 | Ultra Librarian |
| SSOP (DB) | 16 | Ultra Librarian |
訂購與品質
建議產品可能具有與此 TI 產品相關的參數、評估模組或參考設計。