Goof512
Member
Hey all, I'm relatively new here,
I'm working on an ejection channel driver, and I realized that most continuity check systems in commercial dual-deploy systems would give a false positive on a short-circuit failure.
This was kinda concerning to me, as I know wiring is rarely perfect, and I could foresee myself making a stupid mistake sometime. So here's what I came up with:
PAC1952-1x High-side current sense circuit. - Now I despite the name, the PAC1952 is actually a voltage measuring ADC, that just happens to usually be used in a current-sense application with a fixed value sense-resistor.
It has a sensitivity of 1.5uV, meaning that we can measure single-ohm resistive loading at micro-amps of current.
So in this configuration, I'm thinking I can properly separate between shorted loads, properly installed devices, and uninstalled / failed devices.
PYRO_POWER is up around 12V-18V, depending on raw battery voltage, and the PYRO_POWER channel is safed using an arming plug. The DMC3071LVT is a N,P pair MOSFET, capable of 20A burst loading.
I'm working on an ejection channel driver, and I realized that most continuity check systems in commercial dual-deploy systems would give a false positive on a short-circuit failure.
This was kinda concerning to me, as I know wiring is rarely perfect, and I could foresee myself making a stupid mistake sometime. So here's what I came up with:
PAC1952-1x High-side current sense circuit. - Now I despite the name, the PAC1952 is actually a voltage measuring ADC, that just happens to usually be used in a current-sense application with a fixed value sense-resistor.
It has a sensitivity of 1.5uV, meaning that we can measure single-ohm resistive loading at micro-amps of current.
So in this configuration, I'm thinking I can properly separate between shorted loads, properly installed devices, and uninstalled / failed devices.
PYRO_POWER is up around 12V-18V, depending on raw battery voltage, and the PYRO_POWER channel is safed using an arming plug. The DMC3071LVT is a N,P pair MOSFET, capable of 20A burst loading.