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RAMP-FD: heater outputs are on if power from Due not present #19

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bobc opened this issue Dec 17, 2013 · 1 comment
Open

RAMP-FD: heater outputs are on if power from Due not present #19

bobc opened this issue Dec 17, 2013 · 1 comment
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bug RAMPS-FD

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@bobc
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bobc commented Dec 17, 2013

If the Due is not powered but RAMPS-FD is, then the heater outputs (D8-D11) default to an on state.

Redesign FET control circuit to ensure that heater outputs are not active is Due is not powered.
bobc added a commit that referenced this issue Dec 18, 2013
@bobc
RAMPS-FD schematic changes:
1f6033e 
#3 replace C301, C302, C303 and C501 with ceramic 0805;
#4 change endstop connectors to 6x1 and 6x2 to allow key position
#9 change E-STOP connector to KK type;
#18 add 10k pulldowns on heater outputs from CPU
#19 change E-STOP buffers to HCT type to always drive FETs at 5V and remove inverting drivers on heater outputs;
#20 add 24LC256 I2C EEPROM
@cefiar cefiar mentioned this issue Dec 22, 2013
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cefiar commented Dec 22, 2013

New design implemented. Needs testing.

@PreownedFIN PreownedFIN mentioned this issue Sep 7, 2018
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