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  • TCA6424A 低电压 24 位 I2C 和 SMBus I/O 扩展器 具有中断输出、复位和配置寄存器

    • ZHCS275D July   2010  – January 2023 TCA6424A

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  • TCA6424A 低电压 24 位 I2C 和 SMBus I/O 扩展器 具有中断输出、复位和配置寄存器
  1. 1 特性
  2. 2 说明
  3. 3 Revision History
  4. 4 Description (continued)
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings (1)
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 I2C Interface Timing Requirements
    7. 6.7 Reset Timing Requirements
    8. 6.8 Switching Characteristics
    9. 6.9 Typical Characteristics
  7. 7 Parameter Measurement Information
  8. 8 Detailed Description
    1. 8.1 Overview
      1. 8.1.1 Voltage Translation
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 I/O Port
      2. 8.3.2 I2C Interface
    4. 8.4 Device Functional Modes
      1. 8.4.1 Device Address
    5. 8.5 Programming
      1. 8.5.1 Power-On Reset
      2. 8.5.2 Reset Input ( RESET)
      3. 8.5.3 Interrupt Output ( INT)
      4. 8.5.4 Bus Transactions
        1. 8.5.4.1 Writes
        2. 8.5.4.2 Reads
    6. 8.6 Register Maps
      1. 8.6.1 Control Register and Command Byte
      2. 8.6.2 Register Descriptions
  9. 9 Application and Implementation
    1. 9.1 Typical Application
      1. 9.1.1 Detailed Design Procedure
        1. 9.1.1.1 Minimizing ICC When I/Os Control LEDs
    2. 9.2 Power Supply Recommendation
  10. 10Device and Documentation Support
    1. 10.1 Receiving Notification of Documentation Updates
    2. 10.2 支持资源
    3. 10.3 商标
    4. 10.4 静电放电警告
    5. 10.5 术语表
      1.      Mechanical, Packaging, and Orderable Information
  11. 重要声明
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TCA6424A 低电压 24 位 I2C 和 SMBus I/O 扩展器 具有中断输出、复位和配置寄存器

本资源的原文使用英文撰写。 为方便起见，TI 提供了译文；由于翻译过程中可能使用了自动化工具，TI 不保证译文的准确性。 为确认准确性，请务必访问 ti.com 参考最新的英文版本（控制文档）。

1 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)

2 说明

这款针对两线制双向总线 (IC) 的 24 位 I/O 扩展器被设计成通过 I2C 接口 [串行时钟 (SCL) 和串行数据 (SDA)] 为大多数微控制器系列提供通用远程 I/O 扩展。

该器件的主要优势是其宽 VCC 范围。在 P 端口侧和 SDA/SCL 侧，它能够在 1.65V 至 5.5V 的电压范围内运行。这使得 TCA6424A 能够在 SDA/SCL 侧（在这里，电源电平正在降低以节约能耗）与下一代微处理器和微控制器相连接。与微处理器和微控制器的电源电压不断走低不同，有些印刷电路板 (PCB) 组件（例如 LED）保持在 5V 电源上。

封装信息
器件名称封装(1)封装尺寸
TCA6424A超薄四方扁平无引线 (UQFN) (32)5.00mm × 5.00mm
(1) 如需了解所有可用封装，请参阅数据表末尾的可订购产品附录。
GUID-35CEDD75-3D25-4D1C-A6ED-C61A8F2923EE-low.gif
如果使用，那么裸露的中央散热焊盘必须作为一个辅助地进行连接或置于电开路状态。
RGJ 封装（底视图）

3 Revision History

Changes from Revision C (April 2014) to Revision D (January 2023)

  • 删除了对 RSM 封装的所有引用Go
  • 将提到 I2C 的旧术语实例通篇更改为控制器和目标Go
  • Deleted Package thermal impedance from the Absolute Maximum Ratings tableGo
  • Added Storage temperature range to the Absolute Maximum Ratings tableGo
  • Changed Handling Ratings To: ESD Ratings Go
  • Added the Thermal Information tableGo
  • Added the Application and Implementation NOTEGo
  • Added the Detailed Design Procedure sectionGo
  • Added paragraph: "Ramping up the device VCCP" to Power Supply Recommendations Go

Changes from Revision B (September 2010) to Revision C (April 2014)

  • 已删除硬编码的订购信息表Go
  • 更新了文档格式Go

Changes from Revision A (August 2010) to Revision B (September 2010)

  • 已对文档进行修改，将文档状态从预发布更新为量产数据Go
  • 将文档状态从“产品预发布”更改为“量产数据”Go

Changes from Revision * (July 2010) to Revision A (August 2010)

  • Changed Recommended Supply Sequencing and Rates TableGo

4 Description (continued)

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.

5 Pin Configuration and Functions

GUID-35CEDD75-3D25-4D1C-A6ED-C61A8F2923EE-low.gif
If used, the exposed center pad must be connected as a secondary ground or left electrically open.
Figure 5-1 RGJ Package
(Bottom View)
Table 5-1 Pin Functions
PINDESCRIPTION
PIN NO.NAME
1P00P-port input/output (push-pull design structure). At power on, P00 is configured as an input.
2P01P-port input/output (push-pull design structure). At power on, P01 is configured as an input.
3P02P-port input/output (push-pull design structure). At power on, P02 is configured as an input.
4P03P-port input/output (push-pull design structure). At power on, P03 is configured as an input.
5P04P-port input/output (push-pull design structure). At power on, P04 is configured as an input.
6P05P-port input/output (push-pull design structure). At power on, P05 is configured as an input.
7P06P-port input/output (push-pull design structure). At power on, P06 is configured as an input.
8P07P-port input/output (push-pull design structure). At power on, P07 is configured as an input.
9P10P-port input/output (push-pull design structure). At power on, P10 is configured as an input.
10P11P-port input/output (push-pull design structure). At power on, P11 is configured as an input.
11P12P-port input/output (push-pull design structure). At power on, P12 is configured as an input.
12P13P-port input/output (push-pull design structure). At power on, P13 is configured as an input.
13P14P-port input/output (push-pull design structure). At power on, P14 is configured as an input.
14P15P-port input/output (push-pull design structure). At power on, P15 is configured as an input.
15P16P-port input/output (push-pull design structure). At power on, P16 is configured as an input.
16P17P-port input/output (push-pull design structure). At power on, P17 is configured as an input.
17P20P-port input/output (push-pull design structure). At power on, P20 is configured as an input.
18P21P-port input/output (push-pull design structure). At power on, P21 is configured as an input.
19P22P-port input/output (push-pull design structure). At power on, P22 is configured as an input.
20P23P-port input/output (push-pull design structure). At power on, P23 is configured as an input.
21P24P-port input/output (push-pull design structure). At power on, P24 is configured as an input.
22P25P-port input/output (push-pull design structure). At power on, P25 is configured as an input.
23P26P-port input/output (push-pull design structure). At power on, P26 is configured as an input.
24P27P-port input/output (push-pull design structure). At power on, P27 is configured as an input.
25GNDGround
26ADDRAddress input. Connect directly to VCCP or ground.
27VCCPSupply voltage of TCA6424A for P port
28RESETActive-low reset input. Connect to VCCI through a pullup resistor, if no active connection is used.
29SCLSerial clock bus. Connect to VCCI through a pullup resistor.
30SDASerial data bus. Connect to VCCI through a pullup resistor.
31VCCISupply voltage of I2C bus. Connect directly to the VCC of the external I2C controller. Provides voltage-level translation.
32INTInterrupt output. Connect to VCCI through a pullup resistor.

6 Specifications

6.1 Absolute Maximum Ratings(1)

over operating free-air temperature range (unless otherwise noted)
MINMAXUNIT
VCCISupply voltage range–0.56.5V
VCCPSupply voltage range–0.56.5V
VIInput voltage range(2)–0.56.5V
VOOutput voltage range(2)–0.56.5V
IIKInput clamp currentADDR, RESET, SCLVI < 0±20mA
IOKOutput clamp currentINTVO < 0±20mA
IIOKInput/output clamp currentP portVO < 0 or VO > VCCP±20mA
SDAVO < 0 or VO > VCCI±20
IOLContinuous output low currentP portVO = 0 to VCCP25mA
SDA, INTVO = 0 to VCCI15
IOHContinuous output high currentP portVO = 0 to VCCP25mA
ICCContinuous current through GND200mA
Continuous current through VCCP160
Continuous current through VCCI10
TstgStorage temperature range–65150°C
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) The input negative-voltage and output voltage ratings may be exceeded if the input and output current ratings are observed.

 
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