What should be in the Test Point Matrix for a PPC ?

Ivo Clarysse
  • Updated
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To create a custom Pogo Pin Cassette (PPC), in addition to the PCB CAD, we need to know how test points of your PCB should be hooked up to PLT signals.

To facilitate this, please use our Test Point Matrix template, available from https://github.com/bcdevices/plt-docs/raw/master/PLT-200A/PLT-200A%20test%20probe%20assigments%20-%20TEMPLATE.xlsx

Terminology Notes:

DDTP = Direct digital test point

RDTP = Routed digital test point

DATP = Direct analog test point

RATP = Routed analog test point

 

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2 comments

Date Votes
  • Peter Antypas

    What is the difference between "direct" and "routed"?

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  • Ivo Clarysse
    • Edited

    "Direct" probes are connected directly from the Pogo-Pin Cassette (PPC) to the PLT, whereas "Routed" probes are connected through a multiplexer on the PPC.

    Direct Analog Test Probes (DATP00..DATP12)

    • Connected directly from PPC to PLT
    • DATP00..DATP06 can be switched to the MUX0 and MUX1 channels for shorting, impedance or voltage measurements
    • DATP07..DATP12 are connected directly to the DAQ, allowing voltage measurements
    • DATP08 and DATP09 can be connected to the UART0_RXD and UART0_TXD probes (using the `uartCfg UART0 tp` command), to allow voltage measurements on those lines

    Routed Analog Test Probes (RATP00..RATP31)

    • Connected from PPC to PLT through an analog multiplexer on the PPC
    • Only one routed analog test probe from a given ADG bank can be routed at the same time.
    • RATP00..RATP15 are part of the "ADG0 Bank"
    • RATP16..RATP31 are part of the "ADG1 Bank"
    • RATPxx pins can be routed to MUX0 and MUX1 channels for shorting, impedance or voltage measurements

    Direct Digital Test Probes (DDTP00..DDTP16)

    • Connected directly from PPC to PLT
    • DDTP00..DDTP08 can be switched to the MUX2 and MUX3 channels for shorting
    • Can be configured as inputs (no pull-up) or outputs (low or high) using the `pin` command.
    • Logic state for probes that are configured as inputs can be tested using the `measure pin` command.
    • DDTP15 and DDTP16 can be connected to the UART0_CTS and UART0_RTS probes (using the `uartCfg UART0 tp` command), to allow digital sensing or control of those lines

    Routed Digital Test Probes (RDTP00..RDTP31)

    • Connected from PPC to PLT through a multiplexer on the PPC
    • Can be configured as inputs (with or without pull-up) or outputs (low or high) using the `pin` command
    • Logic state for RDTPxx probes that are configured as inputs can be tested using the `measure pin` command
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