LDC1612: The common test data curve

switch

Part Number: LDC1612
Other Parts Discussed in Thread: LDC1614,

Tool/software:

Hi ti team,

During the testing of LDC1614 sensor, the following problems were found. Please help analyze them.

When the channel 0 conversion data was collected without any metal object nearby, it deviated from the common test data curve in the datasheet. What caused this deviation?

Here are the test data for TC:

read data coindata = 160469747
read data coindata = 160476307
read data coindata = 160473811
read data coindata = 160473811
read data coindata = 160477859
read data coindata = 160465699
read data coindata = 160477859
read data coindata = 160473811
read data coindata = 160481923

The register configuration is as follows:

reg:0x08 val: 0x04D6

reg:0x10 val: 0x000A

reg:0x14 val: 0x1002

reg:0x19 val: 0x0000

reg:0x1B val: 0x020C

reg:0x1E val: 0x9000

reg:0x1A val: 0x1001

Other registers are set to their default configurations.

Reference Document: LDC1612, LDC1614 Multi-Channel 28-Bit Inductance to Digital Converter (LDC) for.pdf
Data Curve Reference: Section 8.2.6 of the reference document.

4 months ago

0 John Miller - Sensing 4 months ago

TI__Mastermind 36075 points

Switch,

What test curve data are you comparing to?

Reagrds,
John

0 TC Thundersoft 4 months ago in reply to John Miller - Sensing

Prodigy 20 points

hi hohn,

Reference Document: LDC1612, LDC1614 Multi-Channel 28-Bit Inductance to Digital Converter (LDC) for.pdf
Data Curve compare Reference: Section 8.2.6 of the reference document.

best regards.

0 John Miller - Sensing 4 months ago in reply to TC Thundersoft

TI__Mastermind 36075 points

TC,

What coil are you using?

John

0 TC Thundersoft 4 months ago in reply to John Miller - Sensing

Prodigy 20 points

hi john

The coil is customized according to our entire machine.

best regards.

0 John Miller - Sensing 4 months ago in reply to TC Thundersoft

TI__Mastermind 36075 points

TC,

The curves shown in section 8.2.6 are what you should see if your system uses the same components and settings as shown in the Common Test Conditions of that section.

If you use different device settings, or if your coil and resonant capacitor don't agree with the description in section 8.2.6:

Sensor inductor: 2 layer, 32 turns/layer, 14mm diameter, PCB inductor with L=19.4 μH, RP=5.7 kΩ at 2 MHz
Sensor capacitor: 330 pF 1% COG/NP0

Then you will most likely see a different result than what is shown in the curves.

Is your system using the same coil, capacitor and device settings as shown in Common Test Conditions?

Regards,
John

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LDC1612: The common test data curve