Zerocat Chipflasher  v0.4.10-182-333b622f
Flash free firmware to BIOS chips, kick the Management Engine.
Bill of Material (board.sch)
Note
Footprints are named according to gEDA/gaf and PCB footprint naming convention.
refdes device value footprint description comment qty
U3 CRYSTAL 5MHz CRYSTAL 300 crystal 1
CONN1 CONNECTOR_4 USB-Type-A-Connector +5VDC Power Input 1
U4 24Cxx 24LC256 DIP8 2-wire serial cmos eeprom This chip is optional. Use socket. 1
D3 LED yellow LED3 Software Status #3 1
D7 LED red LED3 Power Status LED 1
D2 LED orange LED3 Software Status #2 1
U6 MAX232 MAX3232CPE DIP16 5V-powered dual RS-232 driver/receiver This circuit is generating RS232 voltages of about +/- 5.5VDC. MAX3232EPE+ works as well, but needs extended reset pulse. 1
J2 HEADER10 male HEADER10_2 RS232 Header with DTE Pin Labels 1
D1 LED green LED3 Software Status #1 1
R15,R16,R17 RESISTOR 220R ACY600 Value need not match exactly. 3
C5 POLARIZED_CAPACITOR 10uF 16V RCY100P polarized capacitor 1
D4 LED red LED3 SPI Bus Status 1
R19,R20 RESISTOR 10K ACY600 2
R4,R5,R8,R9 RESISTOR 100R ACY100S 4
R6,R7 RESISTOR 100R ACY500 2
R3 RESISTOR 100R ACY600 Ron 1
R1 RESISTOR 1K ACY600 Roff 1
J3 HEADER3 male JUMPER3 RST Signal Selector Select RST signal, DTR or RTS 1
U2 7432 74HC32 DIP14 4 OR gates with 2 inputs 1
R2 RESISTOR 22K ACY600 1
J1 CONNECTOR_9 male JUMPER9 SPI Bus Connector Note an angled one extends beyond the PCB's edge. 1
R10 RESISTOR 464R ACY600 1
R11,R12,R13 RESISTOR 100R ACY600 3
R14 VARIABLE_RESISTOR 200R Trim-Resistor-500 CEn pull-up resistor Adjust value until chip detection is successsful. Use a transparent device, if available. 1
U7 AMS1117 3.3V SOT223 1A Low Dropout Voltage Regulator We use standard 1117 (800mA) here, i.e. TS1117. At least 3x3cm tab copper area is missing! 1
U1 P8X32A DIP40 Parallax Propeller 1, Open Source Controller This chip is precious, use socket. If Vdd falls below +2.7V, all pins become tristate. In order to decouple Vdd, use two 100nF caps, one left, one right. RESn is pulled up through 5K when BOEn is low. 1
C15 CAPACITOR 100nF RCY100 capacitor Blocking Cap for 24LC256. 1
C12,C13 CAPACITOR 100nF RCY100 capacitor Blocking Cap for P8X32A. 2
C14 CAPACITOR 100nF RCY100 capacitor Blocking Cap for 74HC32. 1
Q1 IRLML6402 SOT23 IR P-Channel MOSFET 1
CONN2 CONNECTOR_4 JUMPER4 Power Switch Connector 1
D6 DIODE 1N4007 ALF500 We used SY360/1 here. 1
C3 POLARIZED_CAPACITOR 10uF tantalum RCY100P polarized capacitor 1
U5 AMS1117 3.3V SOT223 1A Low Dropout Voltage Regulator We use standard 1117 (800mA) here, i.e. TS1117. Tab copper area for cooling is missing! 1
V1 THERMISTOR +t GradC RXEF075 RCY200 PPTC Thermistor I-Hold 750mA, I-Trip 1.5A Also known as "Polyfuse". 1
D8 DIODE 1N4007 ALF500 Free-Wheeling Diode. We used SY360/1 here. 1
D5 LED red LED3 SPI Power Status LED 1
R18,R21,R22 RESISTOR 220R ACY600 Value need not match exactly. 3
C1 POLARIZED_CAPACITOR 1000uF 6.3V RCY100P polarized capacitor 1
Z1 ZENER_DIODE 6V8 @ 1.3W ALF500 1
C10,C2,C4,C6,C7,C8,C9 CAPACITOR 100nF RCY100 capacitor 7