JLINK Lite ARM Programmer: Target Voltage 2.4V

For people having experience with JLINK Lite ARM (or JLINK Lite CortexM) programmers for non-3.3V targets, here are some questions:

  1. The JLINK spec mentiones VIF to be a fixed 3.3V for the JLINK Lite programmers. Does this mean that the programmer would not work unless VTref pin voltage is 3.3V?
  2. If the JLINK Lite programmer supports VTref 2.4V, would the interface circuit below work?
  3. As I understand it, the JLINK LITE programmer has a fixed interface voltage of 3.3V, meaning SWCLK would be driven at 3.3V levels. To reduce current sinking in to the 2.4V supply via SWD_CLK pin of the MCU, I will use a current limiting resistor (R3). SWD_DATA and nRESET pins of the MCU would anyways have pull ups to 2.4V, so those should be OK. Does this makes sense?

JLINK Lite ARM Programmer: Target Voltage 2.4V

JLINK Lite ARM Programmer: Target Voltage 2.4V

– Schematic created using CircuitLab


Category: programmer Time: 2016-07-29 Views: 0

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