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MSP430F4794: Protection of SD16_A inputs against negative voltages

Part Number: MSP430F4794


We consider connecting amplifiers (RRO), which have to be supplied with relatively high dual voltage (+5V and -5V), to the SD16_A inputs via protecting resistors (say 3kOhm). In some error conditions the amp output voltages can exceed the SD16_A voltage range. Positive overvoltages will be clamped by MSP430 internal diodes connected to AVcc (and the resistors will limit the currents within safe 2mA range). But what about negative voltages? It seems there is no similar clamping on analog inputs. However they should have some built-in protection against negative ESD at least.



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