Other Parts Discussed in Thread: LDC0851,
Thank you for your help. We are sorry for the May rainy inquiry.
Determine the inductance value of the sensor coil connected to LDC0851VM As a method,
I think that the LDC calculation sheet should be used in the following procedure. However,
if you make a mistake, please point it out.
【procedure】
1. Parameter setting on the spiral inductor design sheet
① D22 (LC tank capacity) = 68PF,
② D23 (number of layers) = 2,
③ D24 (number of turns) = 7
④ D25 (coil outer diameter) = 90
⑤ D28 ＝ Circular
⑥ D33 (distance between patterns) = 0.1
⑦ D36 (pattern width) = 0.914
⑧ D39 = 1.524
⑨ D46 = 1
⑩ D206 (target distance) = 2.4mm (Switch between 0.7 ~ 0.8 and ・ ・ ・ 2.2 ~ 2.3 with ADJ_SW)
↓
From the above, the calculated D195 (total inductance without target) is calculated.
2. LDC0851 calculation sheet
① Free space sensor setting table "Sensor inductance" value 1. Enter D195 calculated in Enter D22 (LC tank capacity) and D22 (parasitic capacity).
② Sensor set value when there is a target Sensor diameter: 90, ★ Enter the sensor OFF distance = 2.3 (described in Section1). ↓
Here, the calculated ★★ inductance with the target,
Make a note of the sensor frequency and maximum current value.
3.Again, on the spiral inductor design sheet, the calculation result of item 2 ★★ To approach the inductance value and sensor frequency,
Adjust D24 (number of coil turns) and coil pattern width.
As mentioned above, I'm thinking about repeating items 1 to 3 as a procedure, but is that correct?
4. Sensing distance setting by LDC0851_ADJSW
D206 in item 1 is the sensing distance as a sensor. Is it possible to link the setting of the OFF distance of the ★ sensor in item 2 and the ADJSW of the LDC0851EVM?
That's all,but I would like to save some logical support before modifying the prototype coil. I would like a detailed answer.
Thank you for your cooperation.
