Adapter cable with encapsulated button cell CR2450 for AC500 V2 CPU PM57x, PM58x, PM59x (not PM595) and AC500 V3 CPU PM56xx (TA521)

Data Sheet:

TA521: AC500, adapter cable with encapsulated lithium primary button cell CR2450 to supply the remanent memory and the real-time clock of a CPU PM57x, PM58x, PM59x, (not PM 595) or PM56xx.