Powering-up a device having digital and analog circuitry

Details Powering-up a device having digital and analog circuitry Powering-up a device having digital and analog circuitry

2006-04-11

2006-04-11

Lee, Thomas (Department: 2115)

Electrical computers and digital processing systems: support

Computer power control

Power sequencing

C327S142000, C327S143000

Reexamination Certificate

active

07028201

ABSTRACT:
A method and apparatus is provided to power-up a device having both digital and analog circuitry. The analog circuitry requires a stabilization period before proper operation. During power-up, the digital circuitry is held in reset by a power-on reset circuit. The power-on reset circuit releases the reset after the expiration of a power-on reset period. During the period of time after expiration of the power-on reset period and before the analog circuitry reaches equilibrium, the digital circuitry operates in a mode that does not require input signals from the analog circuitry. After the analog circuitry has reached equilibrium, the digital circuitry begins normal operation during which inputs signals from the analog circuitry may be processed by the digital circuitry.

REFERENCES:
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patent: 5323067 (1994-06-01), Shay
patent: 6097225 (2000-08-01), Smith
Pan et al, Mixed Signal Validation of the Intel Pentium 4 Microprocessor Power-up Sequence, 2003 IEEE, pp. 163-166.
Lattice Semiconductor Corporation, ispPAC-POWR604 Data Sheet, pp. 1-29, ©2004.
Lattice Semiconductor Corporation, ispPAC-POWR1208 Data Sheet, pp. 1-34, ©2004.

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