ZHCSJK2O October 2004 – September 2023 PCA9306
PRODUCTION DATA
- 1
- 1 特性
- 2 应用
- 3 说明
- 4 Revision History
- 5 Pin Configuration and Functions
-
6 Specifications
- 6.1 Absolute Maximum Ratings
- 6.2 ESD Ratings
- 6.3 Recommended Operating Conditions
- 6.4 Thermal Information
- 6.5 Electrical Characteristics
- 6.6 Switching Characteristics AC Performance (Translating Down) (EN = 3.3 V)
- 6.7 Switching Characteristics AC Performance (Translating Down) (EN = 2.5 V)
- 6.8 Switching Characteristics AC Performance (Translating Up) (EN = 3.3 V)
- 6.9 Switching Characteristics AC Performance (Translating Up) (EN = 2.5 V)
- 6.10 Typical Characteristics
- 7 Parameter Measurement Information
-
8 Detailed Description
- 8.1
Overview
- 8.1.1 Definition of threshold voltage
- 8.1.2 Correct Device Set Up
- 8.1.3 Disconnecting an I2C target from the Main I2C Bus Using the EN Pin
- 8.1.4 Supporting Remote Board Insertion to Backplane with PCA9306
- 8.1.5 Switch Configuration
- 8.1.6 Controller on Side 1 or Side 2 of Device
- 8.1.7 LDO and PCA9306 Concerns
- 8.1.8 Current Limiting Resistance on VREF2
- 8.2 Functional Block Diagram
- 8.3 Feature Description
- 8.4 Device Functional Modes
- 8.1
Overview
- 9 Application and Implementation
- 10Power Supply Recommendations
- 11Layout
- 12Device and Documentation Support
- Mechanical, Packaging, and Orderable Information
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8.1.4 Supporting Remote Board Insertion to Backplane with PCA9306
Another situation where PCA9306 is advantageous when using its enable feature is when a remote board with I2C lines needs to be attached to a main board (backplane) with an I2C bus such as in Figure 8-4. If connecting a remote board to a backplane is not done properly, the connection could result in data corruption during a transaction or the insertion could generate an unintended pulse on the SCL line. Which could glitch an I2C device state machine causing the I2C bus to get stuck.
Figure 8-4 An
example of connecting a remote board to a main board (backplane)PCA9306 can be used to support this application because it can be disabled while making the connection. Then it is enabled once the remote board is powered on and the buses on both sides are IDLE.