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Low current bypass disable VNF1048

alesanna_by
Associate

Good morning,

We are evaluating the use of the VNF1048. During the test phase the problem arose that despite the MOS being in the open state we detect a current flow, even if minimal, that for our application must be avoided.

From our point of view this behavior is due to the current coming from the "OUT" pin.

Reading the datasheet in fact, this pin provides a bypass current that could be deactivated via SPI by setting bit 3, reported below, of the CR1 register.

 
 

rtaImage.jpg

However, this does not reflect what happens during testing, in fact despite setting this bit to '0', the behavior of the e-fuse remains unchanged and a minimum current (1mA circa).

Is there a way to command the EFUSE in a complete open (high impedance) state?

1 REPLY 1
Peter BENSCH
ST Employee

As far as I know, there are only two ways to deactivate the BYPASS:

  • with CR#1, bit3 (BYPASSCTL) = 0
  • with CR#3, bit 2 (DIS_OUT_MODE) = 1 (default 0)

Please check whether it is possible to switch it off completely.

Regards
/Peter

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