Method and device for managing a power supply power-on sequence

• Main Authors: SURICO STEFANO, FRULIO MASSIMILIANO, MARZIANI MONICA, BETTINI ANDREA
• Format: Patent
• Language: Chinese; English
• Published: 20.06.2012
• Subjects: BASIC ELECTRONIC CIRCUITRY; ELECTRICITY; PULSE TECHNIQUE

Many circuits require a minimum voltage supply level before proper operation may be initiated. Power-on control circuits have typically used a voltage supply level detector and have compared that level with an internal reference. The internal reference typically has a dependence on device threshold, accuracy of tracking electrical characteristics in the device, as well as temperature and processing variation. The present invention (400) incorporates a typical supply voltage detector (410) to trigger a reference voltage generator (420). The reference voltage generator (420) is a temperature andprocess independent supply capable of operating at low power supply levels. An output voltage level from the reference voltage generator (420) is compared with the ramping-up supply voltage.; When the ramping-up supply voltage is greater than the reference voltage generator output voltage level an enable signal is produced. The enable signal signifies to system circuitry that a supply voltage level great enough to suppor