TCA9554A 是一款 16 引脚器件,可为两线双向 I2C 总线(或 SMBus)协议提供 8 位通用并行输入/输出 (I/O) 扩展。该器件的工作电源电压范围为 1.65V 至 5.5V。器件支持 100kHz(标准模式)和 400kHz(快速模式)两种时钟频率。当开关、传感器、按钮、LED、风扇以及其他相似器件需要额外的 I/O 时,I/O 扩展器(如 TCA9554A)可提供简单解决方案。
当 输入 状态发生变化时,TCA9554A 可在 INT 引脚上生成中断。硬件可选地址引脚 A0、A1 和 A2 最多允许 8 个 TCA9554A 器件位于同一 I2C 总线上。该器件还可通过电源循环供电以生成加电复位,从而复位到默认状态 。
器件型号 | 封装 | 封装尺寸(标称值) |
---|---|---|
TCA9554A | TSSOP (16) | 5.00mm x 4.40mm |
SSOP (16) | 4.90mm × 3.90mm | |
SSOP (16) | 6.20mm x 5.30mm | |
SOIC (16) | 7.50mm x 10.30mm |
Changes from D Revision (August 2015) to E Revision
Changes from C Revision (May 2015) to D Revision
Changes from B Revision (October 2014) to C Revision
Changes from A Revision (March 2012) to B Revision
Changes from * Revision (December 2010) to A Revision
PIN | I/O | DESCRIPTION | |
---|---|---|---|
NAME | NO. | ||
A0 | 1 | I | Address input. Connect directly to VCC or ground |
A1 | 2 | I | Address input. Connect directly to VCC or ground |
A2 | 3 | I | Address input. Connect directly to VCC or ground |
GND | 8 | — | Ground |
INT | 13 | O | Interrupt output. Connect to VCC through a pull-up resistor |
P0 | 4 | I/O | P-port input-output. Push-pull design structure. At power on, P0 is configured as an input |
P1 | 5 | I/O | P-port input-output. Push-pull design structure. At power on, P1 is configured as an input |
P2 | 6 | I/O | P-port input-output. Push-pull design structure. At power on, P2 is configured as an input |
P3 | 7 | I/O | P-port input-output. Push-pull design structure. At power on, P3 is configured as an input |
P4 | 9 | I/O | P-port input-output. Push-pull design structure. At power on, P4 is configured as an input |
P5 | 10 | I/O | P-port input-output. Push-pull design structure. At power on, P5 is configured as an input |
P6 | 11 | I/O | P-port input-output. Push-pull design structure. At power on, P6 is configured as an input |
P7 | 12 | I/O | P-port input-output. Push-pull design structure. At power on, P7 is configured as an input |
SCL | 14 | I | Serial clock bus. Connect to VCC through a pull-up resistor |
SDA | 15 | I/O | Serial data bus. Connect to VCC through a pull-up resistor |
VCC | 16 | — | Supply voltage |