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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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MC34710EWR2 Fiches technique(PDF) 10 Page - Freescale Semiconductor, Inc |
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MC34710EWR2 Fiches technique(HTML) 10 Page - Freescale Semiconductor, Inc |
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10 / 18 page  Analog Integrated Circuit Device Data 10 Freescale Semiconductor 34710 FUNCTIONAL DESCRIPTION FUNCTIONAL PIN DESCRIPTION SUPERVISORY FUNCTIONS Supervisory Circuitry The supervisory circuitry provides control of the RST line, an open drain signal, based on system operating conditions monitored by the 34710. VI/O, VCORE, VB+, and thermal shutdown (TSD) detectors in various parts of the chip are monitored for error conditions. VI/O, VCORE, VB+, and thermal shutdown have both positive and negative-going thresholds for triggering the reset function. The supervisor circuitry also ensures that the regulator outputs follow a predetermined power-up and power-down sequence. Specifically, the sequencing ensures that VI/O is never less than 0.9V below VCORE. This means that VCORE - VI/O will be clamped at 0.5V, and that the VCORE regulator operation will be suppressed during startup and shutdown to ensure that VCORE - VI/O = 0.9V. VB Charge Pump The high side MOSFET in the switching regulator (buck converter) requires a gate drive supply voltage that is biased higher than the B+ voltage, and this boosted voltage is provided by the internal charge pump and stored in a capacitor between the VB pin and the B+ pin. The charge pump operates directly from the B+ supply, and uses an internal oscillator operating at 200kHz. Internal Oscillator The internal oscillator provides a 200kHz square wave signal for charge pump operation and for the buck converter. |
Numéro de pièce similaire - MC34710EWR2 |
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Description similaire - MC34710EWR2 |
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