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[FAQ] AM625 / AM623 / AM62A / AM62P / AM64x / AM243x Design Recommendations / Custom board hardware design - Queries related to passive components values, tolerance, voltage rating

Part Number: AM625

Tool/software:

Hi TI Experts,

1. In the SK/EVM i see 49.9K resistor used. Can i use a standard value instead

2.  In the SK/EVM i see a number of resistors used with 1% tolerance for pullups and series resistors. Can i use standard tolerance resistors?

3. Is there a recommendation on the capacitor voltage rating

4. Sections that have 1% resistor recommendations 

5. Sections that have capacitor value recommendations 

  • Hi Board designers, 

    Refer below 

    1. In the SK/EVM i see 49.9K resistor used. Can i use a  standard value instead

    Ok to use a standard 47K resistor 

    2. In the SK/EVM i see a number of resistors used with 1% tolerance for pullups and series resistors. Can i use standard tolerance resistors?

    There are specific resistors that have 1% tolerance requirements. 

    All other resistors used can be standard tolerance resistors.

    3. Is there a recommendation on the capacitor voltage rating 

    This is customer design and requirements dependent

    Generic suggestion (derating) is to use capacitors with voltage rating > 2 time the worst-case voltage applied for non-polarized capacitors.

    For polarized capacitors review relevant data sheet for derating. 

    4. Sections that have 1% resistor recommendations

    Refer below:

    Resistors that need 1% tolerance 
    Section  Functions
    Power DC/DC output and LDO feedback voltage divider 
      VMON_VSYS 
    USB USB3 SERDES0
      USB2 USB rcalib
      USB VBUS 
    PCIe SERDES0
    DDR4 CAL0
      ZQ0..1
    LPDDR4  CAL0
      ZQ0..1
    eMMC  CALPAD 
    CSI RXRCALIB
    DSI

    TXRCALIB

    The Below excel provides additional details

    List of 1% resistors used in AM62x, AM62Ax, AM62Px, AM625SIP, AM62Dx, AM243x AM64x_EVM_SKs_31122024.xlsx

    5.. Is there a recommendation on the capacitor voltage rating

    CAP_VDDSx, CAP_VDDS_CANUART, CAP_VDDS_MCU, CAP_VDDSHV_MMC1 have capacitor value recommendations.

    Note: USB interface when configured as host has capacitor value requirements to be connected near to the connector.

    Refer USB standards or SK schematics.

    Regards,

    Sreenivasa