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Using Boost Regulator and Disabling Brown Out Reset — Parallax Forums

Using Boost Regulator and Disabling Brown Out Reset

william chanwilliam chan Posts: 1,326
edited 2011-05-10 16:12 in Propeller 1
Hi,

When I tie /BOE to Vdd (3.3v) to disable Brown Out Reset, I found that the Propeller D40 chip cannot be programmed (with PropPlug) when powered by the NCP140233 boost regulator.
The propeller chip also will not run if the eeprom is programmed elsewhere and then plugged in.

Once I changed the connection to connect the /BOE pin to Gnd, everything works, ie, the chip can be programmed and it will also run correctly.

Is this related to the boost regulator's relative slowness in ramping up the voltage at startup?

Comments

  • Phil Pilgrim (PhiPi)Phil Pilgrim (PhiPi) Posts: 23,514
    edited 2011-05-02 21:47
    No it's probably related to the fact that you don't have an external pullup on /RST. The internal pullup is only effective when /BOE is grounded.

    -Phil
  • william chanwilliam chan Posts: 1,326
    edited 2011-05-02 23:31
    Ok. Now I understand. Thanks.
  • Daniel HarrisDaniel Harris Posts: 207
    edited 2011-05-10 16:12
    Im moving this to the Propeller Chip forum. I don't think this needs to live in Parallax Semiconductor.
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