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Hot!PIC32MZ DA internal VDDCORE

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kisve
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2018/03/20 00:51:12 (permalink)
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PIC32MZ DA internal VDDCORE

Hi,
 
I designed a board with PIC32MZ2046DAG176 and did NOT use external VDDCORE (1.8V) because according to the datasheet this MCU has an LDO to create it. So  I only attached 100 nF and 10 uF Capacitors to the VDDCORE pins but when I measured the VDDCORE it was 0V and I can't program the MCU.
 
When I added the VDDCORE externally the programming (and the MCU) worked.
 
So is it required to add VDCORE externally? The datasheet dosn't mention it. 
post edited by kisve - 2018/03/20 01:47:50
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    maxruben
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    Re: PIC32MZ DA internal VDDCORE 2018/03/20 04:30:06 (permalink)
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    Some chips have an input pin that decides whether the internal LDO should be used or not. Couold not find a datasheet for that device.
     
    /Ruben
    #2
    Jim Nickerson
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    kisve
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    Re: PIC32MZ DA internal VDDCORE 2018/03/20 08:32:49 (permalink)
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    Thank you Ruben. I checked it but I didn't find a pin like this.
    #4
    NKurzman
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    Re: PIC32MZ DA internal VDDCORE 2018/03/20 09:11:46 (permalink)
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    Are all the other power pins connected and bypassed, including AVdd?
    #5
    kisve
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    Re: PIC32MZ DA internal VDDCORE 2018/03/21 03:16:24 (permalink)
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    Yes they are. All VDD and AVDD pins are connected and bypassed.
    #6
    kisve
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    Re: PIC32MZ DA internal VDDCORE 2018/03/21 03:26:33 (permalink)
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    Here is the schematic of the power pins.
    Meanwhile I added 2x22uF to 3.3V and 2x22uF to 1.8V but it doesn't help.

    Attached Image(s)

    #7
    maxruben
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    Re: PIC32MZ DA internal VDDCORE 2018/03/21 04:21:40 (permalink)
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    According to the datasheet VUSB3V3 must be connected to VSS if not used.
     
    /Ruben
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    kisve
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    Re: PIC32MZ DA internal VDDCORE 2018/03/21 04:52:21 (permalink)
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    I missed the VUSB3V3 pin.
    I tried to connect it to VSS afterwards but unfortunately it didn't solve the issue.
    #9
    friesen
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    Re: PIC32MZ DA internal VDDCORE 2018/03/22 07:07:25 (permalink)
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    VDDCORE and VDDR1V8 have to be connected to externally supplied 1.8V.  Where you find reference to an on chip LDO I don't know.  While not explicitly telling you you have to supply it, it does list the voltage in the required connection, also as shown in their reference hardware schematics.
    post edited by friesen - 2018/03/22 07:14:08

    Erik Friesen
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    kisve
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    Re: PIC32MZ DA internal VDDCORE 2018/03/22 07:14:24 (permalink)
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    Thank you Erik!
     
    I found it in the datasheet. The section 41.4 On-Chip Voltage Regulator says:
    "The core and digital logic for all PIC32MZ DA devices is designed to operate at a nominal 1.8V. To simplify system designs, devices in the PIC32MZ DA family incorporate an on-chip regulator providing the required core logic voltage from VDDIO."
      
    #11
    friesen
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    Re: PIC32MZ DA internal VDDCORE 2018/03/22 07:22:15 (permalink)
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    Ok, I didn't see that.  Did you connect both vddcores?
     
    It seems funny that the reference hardware would have external ldo's.  You may have to ask Microchip this question.

    Erik Friesen
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    NKurzman
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    Re: PIC32MZ DA internal VDDCORE 2018/03/22 12:12:53 (permalink)
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    kisve
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    Re: PIC32MZ DA internal VDDCORE 2018/03/23 02:13:04 (permalink)
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    I connected all four VDDCORE pins. 
    I saw that the eval boards are using external VDDCORE but the datasheet stated that it has internal LDO. So I choose the simpler solution.
     
    Anyway I wrote to  Microchip as Erik suggested. I hope I will get an answer.
    #14
    mjolhe01
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    Re: PIC32MZ DA internal VDDCORE 2019/10/04 10:27:41 (permalink)
    5 (1)
    I wanted to respond to this thread because we ran into some confusion regarding this issue as well.
     
    After speaking to microchip, VDDCORE is not the "Core" voltage developed by the internal voltage regulator. The internal voltage does not exit the chip anywhere. This creates additional confusion for people with experience with PIC parts because some of them have a VDDCORE/VCAP pin that is brought out externally so bulk decoupling and filter caps can be added.
     
    Basically, all voltages for the part need to be provided externally. 
    #15
    boatbodger
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    Re: PIC32MZ DA internal VDDCORE 2020/02/17 09:17:02 (permalink)
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    For what it's worth, I too got caught out by this with the PIC32MZ...DAR device.
    Oddly, the PIC32MZ...EFF does *not* appear to need an external source of 1.8V.  The datasheet for the DAR is highly misleading, and IMHO the section on "Basic Connection Requirements" should have a single sentence saying "The chip requires an external 1.8V supply, because the statement in 41.4 is just plain wrong!
    Like others, the chip sprang to life for me when I added a 1v8 regulator to the board.
     
    I had consulted the eval kit I have for the DAR169, and failed to spot the external reg.  I will take another look when I have time.
    #16
    Keaton
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    Re: PIC32MZ DA internal VDDCORE 2020/02/25 17:46:39 (permalink)
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    Yes, you need to provide the 1.8v to the part.
     
    see sections
    TABLE 1-23: POWER, GROUND, AND VOLTAGE REFERENCE PINOUT I/O DESCRIPTIONS (page 36)
     
    Electrical specs on TABLE 44-1: OPERATING MIPS VS. VOLTAGE (page 734)
     
    http://ww1.microchip.com/downloads/en/DeviceDoc/PIC32MZ_DA%20_Family%20Datasheet_DS60001361H.pdf
     
    boatbodger
    For what it's worth, I too got caught out by this with the PIC32MZ...DAR device.
    Oddly, the PIC32MZ...EFF does *not* appear to need an external source of 1.8V.  The datasheet for the DAR is highly misleading, and IMHO the section on "Basic Connection Requirements" should have a single sentence saying "The chip requires an external 1.8V supply, because the statement in 41.4 is just plain wrong!
    Like others, the chip sprang to life for me when I added a 1v8 regulator to the board.
     
    I had consulted the eval kit I have for the DAR169, and failed to spot the external reg.  I will take another look when I have time.


    Page 30:
    http://ww1.microchip.com/downloads/en/DeviceDoc/70005311A.pdf

    PIC32 MZ EF and PIC32 MZ DA are similar but not the same. PIC32 MZ DA needs to account for DDR2 (as well as other things)
    #17
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