產品規格表
PCF8574A
- Low standby-current consumption of 10µA max
- I2C to parallel-port expander
- Open-drain interrupt output
- Compatible with most microcontrollers
- Latched outputs with high-current drive capability for directly driving LEDs
- Latch-up performance exceeds 100 mA Per JESD 78, Class II
This 8-bit input/output (I/O) expander for the two-line bidirectional bus (I2C) is designed for 2.5V to 6V VCC operation.
The PCF8574A device provides general-purpose remote I/O expansion for most microcontroller families via the I2C interface [serial clock (SCL), serial data (SDA)].
The device features an 8-bit quasi-bidirectional I/O port (P0–P7), including latched outputs with high-current drive capability for directly driving LEDs. Each quasi-bidirectional I/O can be used as an input or output without the use of a data-direction control signal. At power on, the I/Os are high. In this mode, only a current source to VCC is active.
技術文件
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| 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 | PCF8574A Remote 8-Bit I/O Expander for I2 C Bus datasheet (Rev. H) | PDF | HTML | 2024/9/24 | ||
| 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 | |||
| 更多文件說明 | PCF8574 and PCF8574A Application Clip | 2004/8/18 | ||||
| 更多文件說明 | I2C Application Clip | 2004/7/19 | ||||
| 更多文件說明 | I2C and Serial Bus Devices Application Clip | 2003/7/10 | ||||
| 應用說明 | Improving System Interrupt Management Using the PCF8574 and PCF8574A I/O Expande | 2001/7/27 |
設計與開發
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參考設計
TIDA-01184 — 適用於座椅加熱器的智慧型電源開關參考設計
此參考設計展示用於控制汽車座椅加熱器的 TPS1HA08-Q1 裝置。系統包含主機板和加熱元件，代表汽車座椅加熱器中的電阻式加熱元件。此系統展現了獨立控制各座椅溫度的能力，並提供穩固的診斷與保護機制以因應故障事件。應用涵蓋任何類型的受控加熱元件，例如座椅加熱、溫度控制、除霜、電熱塞和油箱加熱器。
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| VQFN (RGY) | 20 | Ultra Librarian |
| TVSOP (DGV) | 20 | Ultra Librarian |
| PDIP (N) | 16 | Ultra Librarian |
| SOIC (DW) | 16 | Ultra Librarian |
| TSSOP (PW) | 20 | 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。