Hi Inderjit Bains,
You did not mentioned, but I’m assuming that you are using the KITPFPGMEVME programmer with the KITPF0100SKTEVBE socket board, please correct me if I’m wrong.
Now, answering to your questions:
[A1] By default, SW1 configuration is A/B/C Single phase, this is why you cannot edit value on SW1C independently from the SW1A/B, to change this using the GUI rev.4.1 you need to go to the “OTP Configuration” tab and click on the “Enter TBB Mode” button. A window will appear, just click “Ok” button on it.
Then click on “SW1” image and a pop-up window will appear, the 3rd line on this wiondow show the current selected configuration, you can change it using the 4th line, in order to have SW1C independent from SW1A/B, you would need to choose “A/B Single – C Independent” or “A/B Dual – C Independent” configuration.
After your selection, click on “Done”, click on “Return to Run Mode” and go back to the “Buck Supplies” tab to change your SW1C settings.
[A2] If the PMIC is being used, i.Mx6 does not scale the voltage, just the frequency, while the PMIC is scaling the voltage.
[A3] In the MMPF0100, the rate of the output voltage change is controlled by the Dynamic Voltage Scaling (DVS). For the SW1A/B/C, the DVS can be selected between:
25 mV step each 2.0 us
25 mV step each 4.0 us
25 mV step each 8.0 us
25 mV step each 12.0 us
As can be seen in Table 32 “DS Speed Selection for SW1A/B/C” of the datasheet.
[A4] No, there is no way to set a maximum voltage for a supply, care must be taken when setting the regulators voltages.
[A5] Each buck regulator has a programmable current limit. In an overcurrent condition, the current is limited cycle-by-cycle. If the current limit condition persists for more than 8.0 ms, a fault interrupt is generated.
In the GUI 4.1, the current limit checkbox option means:
• Unchecked (2.0x) = High level current limit
• Checked (1.5x) = Low level current limit
For example, for the case of SW1C in Independent mode, if the High level current limit is set (unchecked box/2.0x), the current limit is typ. 4.0A, but if the Low level current limit is set (checked box/1.5x), the current limit is typ. 3.0A.
Have a great day,
Jose
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