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spice: 2.5V from FTDI leaks to 3.3V power line and makes more difficult to shutdown.

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It explains why PCB v1.7 can't shutdown.
pull/3/head
davor 7 years ago
parent baff27af55
commit f5abbf3285
2 changed files with 11 additions and 0 deletions
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6
spice/powersection-v17.spice
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@ -56,6 +56,12 @@ R4 PWREN HOLD 15k
* "OR" diode to 3.3V from switching regulator * "OR" diode to 3.3V from switching regulator
D11 P3V3 HOLD N4148 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 * switching regulator, default off, starts by hysteresis
SW3V3 PWR3V3 P3V3 PWREN 0 SWITCH OFF SW3V3 PWR3V3 P3V3 PWREN 0 SWITCH OFF

5
spice/powersection-v188.spice
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@ -56,6 +56,11 @@ R4 PWREN HOLD 4.7k
* "OR" diode to 3.3V from switching regulator * "OR" diode to 3.3V from switching regulator
D11 P3V3 HOLD LED_GREEN 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 * switching regulator, default off, starts by hysteresis
SW3V3 PWR3V3 P3V3 PWREN 0 SWITCH OFF SW3V3 PWR3V3 P3V3 PWREN 0 SWITCH OFF

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