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LDC1614: IDRIVE setting

Takashi Yamaguchi
Genius 13310 points
Part Number: LDC1614

Hi team,

My customer is considering using the LDC1614. Can you support the following questions from the customer?

1. The IDRIVE setting is described in the d/s as shown below. However, the IDRIVE setting in Power Mode of EVM GUI seems to be different from the d/s. Which one is correct?

2. 　I'm aware that the Idrive is needed to set the amplitude to 1.2V to 1.8V, but the amplitude will be lower than the original setting if I bring metal or other objects close to it.  Is the Idrive set with the target in place, or setting 1.2V to 1.8V with no target, and using the attenuation as sensor detection? Which will be the right decision?

Regards,

Yamaguchi

  • 0
    TI__Expert 3665 points

    1. You are right that is how you set the IDRIVE current, those are the correct registers.What you are confusing are the IDRIVE settings and sensor activation time (8.1.4.2 Sensor Activation)  When low power sensor activation mode is enabled, the IDRIVE code determines how much current the device supplies to the sensor. To determine the optimal current drive setting, move the system target to its furthest distance from the sensor and click the Detect iDriveInit with Auto-Amplitude Correction button. This will take a measurement to determine an appropriate current setting. After the setting has been measured, the code value of Idrive must be adjusted. If the low power sensor activation mode is disabled, the Idrive settings are ignored. 

    2. You want to set the amplitude such that its remains within the 1.2-1.8V range at the min and max travel distances of your target to optimize effective resolution and better SNR.