Freescale Semiconductor,inc.

Freescale Semiocnductor, Inc.

Nitin Pant

Sunny Gupta

Kumar Abhishek

Garima Sharda

Pedro Barbosa Zanetta

Samaksh Sinha

Trong D Nguyen

Shubhra Singh

Aniruddha Gupta

An integrated circuit (IC) includes a digital-to-analog converter (DAC), a voltage monitoring circuit, and a controller. The voltage monitoring circuit includes low voltage detect (LVD) and low voltage warning (LVW) circuits that generate LVD and LVW reference voltage signals. The controller generates and stores a voltage margin word (a difference between first and second DAC words that correspond to the LVD and LVW reference voltage signals, respectively). The controller compares the voltage margin word with predetermined maximum and minimum voltage margin words. If the voltage margin word does not lie between the predetermined maximum and minimum voltage margin words, the controller generates a voltage trimming signal that scales the LVW reference voltage signal. After scaling, if the voltage margin word lies between the predetermined maximum and minimum voltage margin words, the controller generates a calibration pass signal, otherwise the controller generates a calibration fail signal.

Voltage monitoring system

An integrated circuit (IC) includes a reference voltage generator, a voltage regulator, a reset controller, and a voltage monitoring circuit. The reference voltage generator generates first and second reference voltages, and the voltage regulator generates a supply voltage. The reset controller stabilizes the first and second reference voltages in a first predetermined time period, and generates a power down signal after the first predetermined time period. The voltage monitoring circuit compares a level of the supply voltage with a level of the second reference voltage after the first predetermined time period and generates a (low) voltage monitor signal. The reset controller also generates a (high) reset signal when the supply voltage is greater than the second reference voltage.

Voltage monitoring circuit

An integrated circuit (IC) that operates in high and low power modes includes high and low power regulators, first and second sets of circuits, a switch connecting the high power regulator and the second set of circuits, and a wake-up control system. The wake-up control system includes a state machine that enables the high power regulator when the IC is in the high power mode, and enables the low power regulator when the IC is in the low power mode. The switch is closed when the high power regulator reaches a first threshold voltage. The state machine operates on a low frequency clock signal when the IC is in the low power mode and during wake-up, and on a high frequency clock signal in the high power mode after the switch is closed.

Integrated circuit wake-up control system

An integrated circuit (IC) with voltage regulation includes high power and low power domains, low and high voltage regulators and a low power regulator. The low voltage regulator powers the high and low power domains when the IC is in a HIGH power mode. The low power regulator receives a voltage from a high voltage regulator and powers the low power domain when the IC is in a LOW power mode. The IC includes a switching module that disconnects the low voltage regulator from the low power domain when the output voltage of the high voltage regulator is lower than a threshold voltage during power-up and connects the low voltage regulator to the low power domain when the voltage regulated by the high voltage regulator exceeds the threshold voltage.

Voltage regulation system for integrated circuit

An analog to digital converter (ADC) includes a clock-halting circuit that is enabled by an externally generated trigger signal. The clock-halting circuit halts an input clock signal to the ADC for a predetermined time period and resumes the input clock signal to the ADC when the predetermined time period ends.

Analog-to-digital converter with clock halting circuit

A buffer and control circuit for a synchronous memory controller includes first and second differential comparators and control logic. The first differential comparator is provided with positive and negative differential input signals and the second differential comparator is provided with offset positive and negative differential input signals. The first and second differential comparators generate output signals based on magnitudes of the positive and negative differential input signals and the offset positive and negative differential input signals. The control logic generates a reference strobe signal based on the output signals.

Growing community of inventors

New Delhi, India

Nitin Pant