Part Number: TCA9803
Dear Whomever it concerns!
My plan is to use a series connection of two TCA9803. See attached picture below.
Interface C is between MCU (bus master) and B-side of one TCA9803. MCU and TCA9803 are supplied with the same VCC +3V3. Corresponding to
10.2.2 Buffering Without Level-Shifting but reversed electrical circuit structure.
In this case I belive I can control the enable signal from the MCU even if it is on the "wrong" side.
Is this correct understood?
Then I have interface B that is across a 1m cable between the two TCA9803.
At last there is my sensor at interface A.
Interface A will have a need of a thight controlled 3.35V+- 0.05
The tolerances of the voltages on the main PCB and the voltage drop across the wire will cause two different voltage levels.
Therefore I thought of selecting the TCA9803.
Is the TCA9803 the best solution for this case?
The complete solution is an adjusted 10.2.4 Series Device Use Case
Bus master is to the right. Enable signal from the right TCA9803 is connected to the bus master. The right bus master VCCA and VCCB is connected to the same supply 3V3 +-10%.
The left TCA 9803 is interfacing the sensor. The sensor has an internal pull-up and this makes it impossible to use the set-up defined in the datasheet.
I assume that the direction of not critical.
What are the drawbacks with my approach?
Best regards Anders
In reply to Max Robertson:
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with respect to these materials. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.