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Programming issue with ST32L052K8U

Question asked by Jeff on Oct 6, 2015
Latest reply on Oct 6, 2015 by Clive One

We are trying to program an ST32L052K8U from an FTDI cable, but we seem not being able to succeed, this method worked on different chips before, and it also works on the STM32L053C8T6 (the eval board).

The VDD is a stable 2.5Volt line, and the FTDI cable is operating between 0 --> 3.3v, Boot0 is High during boot, and we also tried high, then reset.

NRST is high constantly, and also on the stable 2.5V from internally.

When sending the 0x7F to the controller to start programming, we have a .4 ripple in the RX line. and never get a reply from the micro controller.

Inline image 3

Have you any recommendations what we can try? The RX and TX lines are directly connected to the TX and RX line of the FTDI chip.