From f5abbf32856eb00ca490f4853a652011a297e912 Mon Sep 17 00:00:00 2001 From: davor Date: Sun, 3 Jun 2018 18:26:17 +0200 Subject: [PATCH] spice: 2.5V from FTDI leaks to 3.3V power line and makes more difficult to shutdown. It explains why PCB v1.7 can't shutdown. --- spice/powersection-v17.spice | 6 ++++++ spice/powersection-v188.spice | 5 +++++ 2 files changed, 11 insertions(+) diff --git a/spice/powersection-v17.spice b/spice/powersection-v17.spice index 8e9011e..9fdea8d 100644 --- a/spice/powersection-v17.spice +++ b/spice/powersection-v17.spice @@ -56,6 +56,12 @@ R4 PWREN HOLD 15k * "OR" diode to 3.3V from switching regulator D11 P3V3 HOLD N4148 +* 2.5V from FTDI also supplies P3V3 line so it never falls to 0V +* it explains why v1.7 wakes after power off +VFTDI2V5 hard_2V5 0 2.8V +* FTDI internal resistance for soft 2.5V to P3V3 line +RFTDI hard_2V5 P3V3 10 + * switching regulator, default off, starts by hysteresis SW3V3 PWR3V3 P3V3 PWREN 0 SWITCH OFF diff --git a/spice/powersection-v188.spice b/spice/powersection-v188.spice index c13664c..d540af8 100644 --- a/spice/powersection-v188.spice +++ b/spice/powersection-v188.spice @@ -56,6 +56,11 @@ R4 PWREN HOLD 4.7k * "OR" diode to 3.3V from switching regulator D11 P3V3 HOLD LED_GREEN +* 2.5V from FTDI also supplies P3V3 line so it never falls to 0V +VFTDI2V5 hard_2V5 0 2.8V +* FTDI internal resistance for soft 2.5V to P3V3 line +RFTDI hard_2V5 P3V3 10 + * switching regulator, default off, starts by hysteresis SW3V3 PWR3V3 P3V3 PWREN 0 SWITCH OFF