Secondary Esd Protection Circuit. Emi emc eft and esd circuit design consideration for 32 bit microcontrollers introduction this application note is intended to provide recommendations concerning incorporation of circuit protection devices and pcb layout guidelines to enhance an application s immunity in electrically noisy environments and survivability of emi emc eft and. 4 esd protection circuit solutions esd protection circuits are designed for input output and power bus based upon their special needs.
The secondary protection circuits are required to prevent both the short circuit and thermal runaway conditions in the event the primary circuit does not operate properly the primary circuit is susceptible to esd damage and thermal overstress the silicon structures of the primary protection circuitry have a potential for failing in a shorted condition allowing energy to flow in the event the protection circuit is damaged. Primary esd clamp is deployed for a formation of discharge current path along with a power supply esd clamp. For rx circuit active pmos clamp with no voltage overshoot is used as secondary clamp to gnd.
For rx circuit active pmos clamp with no voltage overshoot is used as secondary clamp to gnd.
This creates the perfect environment for electro static discharge esd hazards or the discharge of static electricity from a body surface to a device. Rf digital i o processor core etc. Phones has encouraged increasing interaction with these devices. The secondary protection circuits are required to prevent both the short circuit and thermal runaway conditions in the event the primary circuit does not operate properly the primary circuit is susceptible to esd damage and thermal overstress the silicon structures of the primary protection circuitry have a potential for failing in a shorted condition allowing energy to flow in the event the protection circuit is damaged.
