* POWERSECTION -> plot v(pwrbtn_pulse),v(shutdown_pulse),v(wake_pulse),v(p3v3),v(ftdi_nsleep),v(pwren) * Simulation of power network * POWER ON: USB plugged in, POWER button, RTC alarm, FTDI_nSLEEP * POWER OFF: SHUTDOWN signal * FTDI_nSLEEP has priority over SHUTDOWN signal (not yet simulated) * Simulate 5V USB plugging in every 10 seconds * start rise fall duration period VUSB5V hard_5V 0 PULSE(0V 5V 0.1s 10ms 10ms 9s 10s DC=0V) * internal resistor provides "soft" USB 5V Rusb hard_5V USB5V 0.1 * shutdown pulse every 1 second, start after 0.4s * start rise fall duration period VSHUT shutdown_pulse 0 PULSE(0V 3.3V 0.4s 10ms 10ms 100ms 1s DC=0V) * convergence friendly resistor RSHUT shutdown_pulse SHUTDOWN 220 * power up button pulse every 10 seconds, start after 0.7s * start rise fall duration period VPWRBTN pwrbtn_pulse 0 PULSE(0V 3.3V 0.9s 10ms 10ms 100ms 10s DC=0V) * RTC internal wakeup pulse every 10 seconds, start after 1.7s * start rise fall duration period VWAKEUP wake_pulse 0 PULSE(0V 3.3V 1.9s 10ms 10ms 100ms 10s DC=0V) * convergence friendly internal resistor Rwk wake_pulse wake_base 1k * FTDI_nSLEEP signal every 10 seconds, start after 2.3s * start rise fall duration period VFTDI FTDI_nSLEEP 0 PULSE(0V 2.5V 2.2s 10ms 10ms 0.5s 10s DC=0V) * RTC internal NPN transisfor for open collector output Qwk WAKEUPn wake_base 0 BC847 * hard 3.3V voltage Vhard3V3 hard_3V3 0 3.3V * internal resistor provides delayed rise of 3.3V Rsmps hard_3V3 PWR3V3 10 * base resistor R6 WAKEUPn WKn 1.2k * PNP transistor Q1 WKUP WKn USB5V BC857 * Slow down capacitor, initially discharged C13 USB5V WKUP 2.2uF IC=0 * diode to discharge C13 at shutdown D13 0 WKUP N4148 * diode to activate onboard switching regulator D10 WKUP WAKE N4148 * "OR" resistors R1 WAKE PWREN 4.7k 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 * pull down resistor R2 PWREN 0 18k * small mosfet M1 drain SHUT 0 0 N7002 * drain resistor R8 drain PWREN 1.2k * mosfet gate slowdown resistor C14 SHUT 0 220nF * mosfet gate discharge (default OFF) resistor R5 SHUT 0 2.2MEG * diode to discharge gate at shutdown D14 SHUT P3V3 N4148 * diode for shutdown to only pull down, never up D15 SHUTDOWN SHUT BAT54W * Pull down resistor R13 SHUTDOWN 0 15k * power button R3 USB5V pwrbtn 4.7k D16 WAKEUPn pwrbtn N4148 SPWR pwrbtn 0 pwrbtn_pulse 0 SWITCH OFF * ftdi no-sleep network R10 FTDI_nSLEEP FTDI_nSUSPEND 130 D12 FTDI_nSUSPEND PWREN BAT54W * The load (slow) RL P3V3 0 100 CL P3V3 0 1000uF .TRAN 1ms 3.3s .OPTIONS METHOD=GEAR, RELTOL=1E-3, itl1=500, itl4=500 *.OPTIONS gmin=1e-11 reltol=4e-4 itl1=500 itl4=500 *.OPTIONS gmin = 1E-12, reltol = 1E-3, itl1 = 500, itl4 = 500 .MODEL SWITCH SW (VT=1V, VH=0.5V, RON=0.01, ROFF=100MEG) .MODEL N4148 D (CJO=0.2pF) .MODEL BAT54W D ( +IS=1.4092e-08 RS=0.78137 N=0.960292 EG=0.706829 +XTI=0.5 BV=30 IBV=0.00001 CJO=1.28873e-11 +VJ=0.604739 M=0.445477 FC=0.5 TT=0 +KF=0 AF=1) *Typ RED GaAs LED: Vf=1.7V Vr=4V If=40mA trr=3uS .MODEL LED_RED D (IS=93.2P RS=42M N=3.73 BV=4 IBV=10U + CJO=2.97P VJ=.75 M=.333 TT=4.32U) *Typ RED,GREEN,YELLOW,AMBER GaAs LED: Vf=2.1V Vr=4V If=40mA trr=3uS .MODEL LED_GREEN D (IS=93.1P RS=42M N=4.61 BV=4 IBV=10U + CJO=2.97P VJ=.75 M=.333 TT=4.32U) *Typ BLUE SiC LED: Vf=3.4V Vr=5V If=40mA trr=3uS .MODEL LED_BLUE D (IS=93.1P RS=42M N=7.47 BV=5 IBV=30U + CJO=2.97P VJ=.75 M=.333 TT=4.32U) .MODEL BC847 NPN (BF=150) .MODEL BC857 PNP (BF=150) .MODEL N7002 NMOS (LEVEL=1, VTO=2.5, KP=40, RS=0.033, RD=0.034) * todo * [x] delay: switch power 3.3V doesn't start immediately simulated with Rsmps=10 ohm * [ ] control signals should be derived from P3V3 line