PDF《电路和复位功能》

22 7.6 I2 C Interface Timing Requirements.6 12.2 Layout Example

22 7.7 Switching Characteristics.7

13 器 器件 件和 和文 文档 档支 支持 持23 7.8 Interrupt and Reset Timing Requirements.7 13.1 Trademarks.23 7.9 Typical Characteristics.8 13.2 Electrostatic Discharge Caution.23

8 Parameter Measurement Information

9 13.3 术语表

23 9 Detailed Description

11 14 机 机械 械, ,封 封装 装和 和可 可订 订购 购信 信息 息.23

5 修 修订 订历 历史 史记 记录 录Changes from Revision A (March 2014) to Revision B Page ? 图形中更新的引脚名称.1 Changes from Original (January 2014) to Revision A Page ? 已将预览文档更新为完整版.1

2 Copyright ? 2014, Texas Instruments Incorporated TCA9545A www.ti.com.cn ZHCSC52B CJANUARY 2014CREVISED MARCH

2014 6 Terminal Configuration and Functions Terminal Functions NO. DESCRIPTION PW NAME

1 A0 Address input 0. Connect directly to VCC or ground.

2 A1 Address input 1. Connect directly to VCC or ground. Active-low reset input. Connect to VCC or VDPUM (1) through a pull-up resistor if not

3 RESET used.

4 INT0 Active-low interrupt input 0. Connect to VDPU0 (1) through a pull-up resistor.

5 SD0 Serial data 0. Connect to VDPU0 (1) through a pul-up resistor.

6 SC0 Serial clock 0. Connect to VDPU0 (1) through a pull-up resistor.

7 INT1 Active-low interrupt input 1. Connect to VDPU1 (1) through a pull-up resistor.

8 SD1 Serial data 1. Connect to VDPU1 (1) through a pull-up resistor.

9 SC1 Serial clock 1. Connect to VDPU1 (1) through a pull-up resistor.

10 GND Ground

11 INT2 Active-low interrupt input 2. Connect to VDPU2 (1) through a pull-up resistor.

12 SD2 Serial data 2. Connect to VDPU2 (1) through a pull-up resistor.

13 SC2 Serial clock 2. Connect to VDPU2 (1) through a pull-up resistor.

14 INT3 Active-low interrupt input 3. Connect to VDPU3 (1) through a pull-up resistor.

15 SD3 Serial data 3. Connect to VDPU3 (1) through a pull-up resistor.

16 SC3 Serial clock 3. Connect to VDPU3 (1) through a pull-up resistor.

17 INT Active-low interrupt output. Connect to VDPUM (1) through a pull-up resistor.

18 SCL Serial clock line. Connect to VDPUM (1) through a pull-up resistor.

19 SDA Serial data line. Connect to VDPUM (1) through a pull-up resistor.

20 VCC Supply power (1) VDPUX is the pull-up reference voltage for the associated data line. VDPUM is the master I2 C master reference voltage and VDPU0CVDPU3 are the slave channel reference voltages. Copyright ? 2014, Texas Instruments Incorporated

3 TCA9545A ZHCSC52B CJANUARY 2014CREVISED MARCH

2014 www.ti.com.cn

7 Specifications 7.1 Absolute Maximum Ratings(1) over operating free-air temperature range (unless otherwise noted) MIN MAX UNIT VCC Supply voltage range C0.5

7 V VI Input voltage range(2) C0.5

7 V II Input current ±20 mA IO Output current ±25 mA Continuous current through VCC ±100 mA Continuous current through GND ±100 mA Ptot Total power dissipation

400 mW TA Operating free-air temperature range C40

85 °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. 7.2 Handling Ratings PARAMETER DEFINITION MIN MAX UNIT Tstg Storage temperature range C65