In addition, the P8xC557E4 has two software selectable modes of power reduction - Idle Mode and power-down mode. The Idle Mode freezes the CPU while allowing the RAM, timers, serial ports, and interrupt system to continue functioning. The power-down mode saves the RAM contents but freezes the oscillator, causing all other chip functions to be inoperative.
While Equation 2 describes the thermal resistance of a single die, the dual die SOP-8 package introduces an additional thermal component, thermal coupling resistance Rop. Equation 3 describes Rop as a function of the top copper mounting pad area.
| jj | | | | |
| | N | | DC | |
| | | j | | |
| Square Rated V | wave (D : 'r applied | - 0.50) | | | |
| see note (2) | | | | | |
| | | | | | |
