TMAG6180-Q1: need the following chips using on gear position system

Our customer's design is like 

Yuhau,

Thank you for reaching out on E2E. I will try to answer your questions here, but could use some help understanding more about the various needs in the system.  Perhaps you can give a little more insight regarding the measurement goals within the application?

1. For this item, are you needing to measure current? 
2. MLX90377 is a 3D magnetic sensor which communicates using the SENT protocol, built in multi-point linearization, and stray field rejection.  While we don't currently offer a direct replacement for this device, we do have 3D sensors such as TMAG5170-Q1 which is compliant up to ASIL-B and TMAG5170D-Q1 which offers redundancy which is typically needed for higher ASIL ratings.  Both of these options are able to measure the all components of the magnet field vector similar to MLX90377, but the output format will be SPI. This device is certainly capable of measuring the transit of a magnet moving linearly:
   https://www.ti.com/video/6321398729112
3.   I cannot find details online about TLE5555iC, so it is difficult to recommend any equivalent parts.  I would guess that a multi-pole ring magnet is connected to the gear, and that the goal is to track the rotation?  In this case, a device like TMAG5111 might be a good option to detect the pole transitions of the rotating ring magnet.  This device would output speed and direction of the gear.  If the gear is not connected to a magnet, this operation might be accomplished by installing a fixed magnet adjacent to a 3D sensor such as TMAG5170-Q1.  As the gear teeth pass, the field will be affected at the sensor location and the field vector data might be used to observe the passage of each tooth.

Let me know if my assumptions are close, and what exactly is needed for item #1.  

Thanks,

Scott

Hello Scott,

Yes our customer need to measure current, they want a one dimension sensor rather than a 3D position sensor for a e-shifter design with current sensor whose holding current is 2A, solenoid valve resistance 3Ω, and sense 28mH. The picture shows the one dimension sensor.

And for the Dog clutch application they want the detection distance of the P gear in the Z direction is 3mm, and the moving distance of the P gear magnet in the X direction is 14mm;

Best regards

Yuhao

Yuhao,

To measure distance with a 1D sensor, I would normally first consider TAMG5253 or DRV5055.  These are 1D linear sensors which may be used to track the absolute magnetic field.  We have a simulation design tool which will likely be helpful as well

https://webench.ti.com/timss/

I pull in the current sense team to see if they have a particular recommendation for item #1

Thanks,

Scott

Hello Yuhao,

What are the voltages being used for this application.  Are they measuring high side?  Since this has two different topics do you want to create a separate thread?

Regards,

Javier