Designing a battery operated circuit that uses active shutter 3D glasses. So far, I'm able to drive them directly from a CMOS chip - a CD4060. They like 18v dc so there are some advantages to CD4000 series (vs 74HC series) circuits.
The glasses come with a previously wired 3.5mm plug.
I'm considering the situation where the plug gets pulled excessively, or gets frayed by being stepped on, chewed by the pet cat, or otherwise messed up.
I've seen this happen a lot with headphones - the plug and the wire going into it can get abused. When this happens, of course the headphones stop functioning - but when driven from the output of an audio headphone amplifier, headphone-out of a laptop, etc, usually the only failure is the headphones. A short in the wire or plug doesn't kill the amp or laptop (usually).
But what about a CMOS chip? Will a short to ground kill a CD4060? If it can, is there a standard method for output protection? A short-circuit tolerant buffer or inverter? Since I'm running off of a battery, anything that hogs current when it isn't protecting won't be a good idea. Spec sheets for the CD4000 series talk about short circuit output current, but they appear to max out at an equivalent R of about 160 ohms - that's for drive calculations, I think - not for true output short circuit protection.
Any suggestions?
Sorry for being long-winded here. To be succinct: Suggestion for low-current CD4000 series output short circuit protection?
The glasses come with a previously wired 3.5mm plug.
I'm considering the situation where the plug gets pulled excessively, or gets frayed by being stepped on, chewed by the pet cat, or otherwise messed up.
I've seen this happen a lot with headphones - the plug and the wire going into it can get abused. When this happens, of course the headphones stop functioning - but when driven from the output of an audio headphone amplifier, headphone-out of a laptop, etc, usually the only failure is the headphones. A short in the wire or plug doesn't kill the amp or laptop (usually).
But what about a CMOS chip? Will a short to ground kill a CD4060? If it can, is there a standard method for output protection? A short-circuit tolerant buffer or inverter? Since I'm running off of a battery, anything that hogs current when it isn't protecting won't be a good idea. Spec sheets for the CD4000 series talk about short circuit output current, but they appear to max out at an equivalent R of about 160 ohms - that's for drive calculations, I think - not for true output short circuit protection.
Any suggestions?
Sorry for being long-winded here. To be succinct: Suggestion for low-current CD4000 series output short circuit protection?