封装信息
| 封装 | 引脚 UQFN (RGJ) | 32 |
| 工作温度范围 (°C) -40 to 85 |
| 包装数量 | 包装 3,000 | LARGE T&R |
TCA6424A 的特性
- 工作电源电压范围为 1.65 V 至 5.5 V
- 允许下列端口间的双向电压电平转换和 GPIO 扩展：
- 1.8V SCL/SDA 和 1.8V、2.5V、3.3V 或 5V P 端口
- 2.5V SCL/SDA 和 1.8V、2.5V、3.3V 或 5V P 端口
- 3.3V SCL/SDA 和 1.8V、2.5V、3.3V 或 5V P 端口
- 5V SCL/SDA 和 1.8V，2.5V，3.3V 或 5V P 端口
- I2C 至并行端口扩展器
- 1µA 的低待机流耗
- 施密特触发操作支持在 SCL 和 SDA 输入端实现缓慢输入转换并提升开关噪声抗扰度
- 1.8V 时，Vhys = 0.18V（典型值）
- 2.5V 时，Vhys = 0.25V（典型值）
- 3.3V 时，Vhys = 0.33V（典型值）
- 5V 时，Vhys = 0.5V（典型值）
- 可耐受 5V 电压的 I/O 端口
- 低电平有效复位输入 (RESET)
- 开漏低电平有效中断输出 (INT)
- 400kHz 快速 I2C 总线
- 输入/输出配置寄存器
- 极性反转寄存器
- 内部上电复位
- 在所有通道均配置为输入的情况下上电
- 加电时无干扰
- SCL/SDA 输入端上的噪声滤波器
- 具有最大高电流驱动能力的锁存输出，适用于直接驱动 LED
- 闩锁性能超过 100mA，符合 JESD 78 II 类规范的要求
- ESD 保护性能超过 JESD 22 规范要求
- 2000V 人体放电模型 (A114-A)
- 200V 机器放电模型 (A115-A)
- 1000V 充电器件模型 (C101)
TCA6424A 的说明
The bidirectional voltage level translation in the TCA6424A is provided through VCCI. VCCI should be connected to the VCC of the external SCL/SDA lines. This indicates the VCC level of the I2C bus to the TCA6424A. The voltage level on the P-port of the TCA6424A is determined by the VCCP.
The TCA6424A consists of three 8-bit Configuration (input or output selection), Input, Output, and Polarity Inversion (active high) registers. At power on, the I/Os are configured as inputs. However, the system controller can enable the I/Os as either inputs or outputs by writing to the I/O configuration bits. The data for each input or output is kept in the corresponding input or output register. The polarity of the Input Port register can be inverted with the Polarity Inversion register. All registers can be read by the system controller.
The system controller can reset the TCA6424A in the event of a timeout or other improper operation by asserting a low in the RESET input. The power-on reset puts the registers in their default state and initializes the I2C/SMBus state machine. The RESET pin causes the same reset/initialization to occur without depowering the part.
The TCA6424A open-drain interrupt ( INT) output is activated when any input state differs from its corresponding Input Port register state and is used to indicate to the system controller that an input state has changed.
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 TCA6424A can remain a simple target device.
The device P-port outputs have high-current sink capabilities for directly driving LEDs while consuming low device current.
One hardware pin (ADDR) can be used to program and vary the fixed I2C address and allow up to two devices to share the same I2C bus or SMBus.