Abstract: A wireless transceiver includes a first integrated circuit and a second integrated circuit. The first integrated circuit includes a memory module that stores a plurality of operational instructions for implementing a plurality of protocol layers of a wireless protocol, a processing module that executes the plurality of operational instructions, and a first interface module. The second integrated circuit includes a second interface module that couples data to and from the first interface module, an RF transceiver that modulates a first baseband signal to produce a transmitted RF signal, and that demodulates a received RF signal to produce a second baseband signal, and a baseband module that generates the first baseband signal based on data received from the first interface module via the second interface module, and that generates data based on the second baseband signal to send to the first interface module via the second interface module.

Abstract: A processing system includes a processing module and a memory module for storing plurality of data. A controllable power source supplies a source voltage to the memory module in response to a target voltage. A controller module receives a temperature signal and adjusts the target voltage in response to the temperature signal.

Abstract: A handheld audio system includes a radio signal decoder integrated circuit (IC) and a digital audio processing integrated circuit. The radio signal decoder integrated circuit produces a digital left channel signal and a digital right channel signal from a received radio signal in accordance with an enable signal and also produces a system clock. The digital audio processing integrated circuit includes a DC-to-DC converter and a processing module. The DC-to-DC converter is operably coupled to produce at least one power supply voltage based on the system clock. The processing module is operably coupled to produce the enable signal when the at least one power supply voltage has reached a desired level and to produce audio signals for audio playback from at least one of the digital left and right channel signals and a stored digital audio file.

Abstract: A headphone driver includes a driver module for generating a plurality of headphone driver signals including a filtered stereo sum signal.

Abstract: A system-on-a-chip integrated circuit includes a multimedia module that produces rendered output data and a high-speed interface. A processing module generates output multimedia data in accordance with at least a portion of a multimedia application in response to input multimedia data received from either the multimedia module or the high-speed interface. The output multimedia data is provided to either the multimedia module or the high-speed interface. An on-chip DC-to-DC converter converts a battery voltage into a supply voltage that is coupled to the multimedia module, the high-speed interface, and/or the processing module.

Abstract: A wireless handset includes a long range wireless transceiver for selectively providing an inbound communication and an outbound communication through a wireless telephone network. A battery monitor module monitors a remaining power of a battery and produces a control signal when the remaining power compares unfavorably to a reserve power threshold. A processing module allows an outbound communication to an allowed recipient when the control signal is asserted, and prohibits an outbound communication to a disallowed recipient when the control signal is asserted.

Abstract: A method for mitigating interference from a switched-mode power supply begins by comparing a channel of interest of a plurality of channels with a switching rate of a switch-mode power supply. The method continues when the channel of interest compares unfavorably to the switching rate by adjusting the switching rate of the switch-mode power supply until the channel of interest compares favorably to the switching rate.

Abstract: A method for booting a system on a chip (IC) integrated circuit includes reading a warm boot flag stored in a persistent register of an analog portion of the system on a chip IC. A warm boot procedure is executed when the warm boot flag is set.

Abstract: A circuit for use by a multifunction handheld device is coupleable to an audio output device, the multifunction handheld device including a color video display device and a host interface that is coupleable to a host device.

Abstract: A wireless transceiver includes a first integrated circuit and a second integrated circuit. The first integrated circuit includes a memory module that stores a plurality of operational instructions for implementing a plurality of protocol layers of a wireless protocol, a processing module that executes the plurality of operational instructions, and a first interface module. The second integrated circuit includes a second interface module that couples data to and from the first interface module, an RF transceiver that modulates a first baseband signal to produce a transmitted RF signal, and that demodulates a received RF signal to produce a second baseband signal, and a baseband module that generates the first baseband signal based on data received from the first interface module via the second interface module, and that generates data based on the second baseband signal to send to the first interface module via the second interface module.

Abstract: A microphone bias circuit includes a first integrated circuit (IC) pin, a second IC pin, a first resistor, and a variable supply voltage buffer. The first resistor is operably coupled to the first IC pin and a return voltage. The second IC pin is operably coupled to receive analog signals from a microphone. The variable supply voltage buffer is operably coupled to produce a buffered supply voltage based on a variable impedance setting, wherein at least one off-chip component couples the second IC pin to the first IC pin and wherein the variable supply voltage buffer provides the buffered supply voltage to second IC pin as a microphone bias voltage.

Abstract: A battery-optimized system-on-a-chip includes multimedia module, a high-speed interface, a processing module, on-chip memory, and an on-chip DC-to-DC converter. The multimedia module operably coupled to produce rendered output data from input data received via the high-speed interface and/or from data stored in the on-chip memory. The high-speed interface is operably coupled to provide data to and from an external source. The on-chip memory is operably coupled to store at least a portion of a multimedia application, wherein the processing module processes input multimedia data in accordance with the multimedia application to produce output multimedia data. The on-chip DC-to-DC converter is operably coupled to convert a battery voltage into a supply voltage that is provided to the multimedia module, the high-speed interface, the processing module, and/or the on-chip memory.

Abstract: A headphone driver includes a driver module for generating a plurality of headphone driver signals including a filtered stereo sum signal.

Abstract: A processing system includes a processing module and a memory module for storing plurality of data. A controllable power source supplies a source voltage to the memory module in response to a target voltage. A controller module receives a temperature signal and adjusts the target voltage in response to the temperature signal.

Abstract: An audio amplifier generates an output to a load, in which a digital-to-analog converter drives the amplifier during powering up and powering down the amplifier. The digital-to-analog converter controls the amplifier to ramp the voltage at the output at a predetermined rate to reduce rapid voltage changes from being sent to the load during the powering up or powering down sequence.

Abstract: A method for use in a multifunction handheld device includes receiving a first plurality of digitally formatted files from a host device when coupled to the host device via a host interface. A selected one of the first plurality of digitally formatted files is played, the playing includes generating an audio output. The method monitors for a low voltage condition produced by a low battery voltage. When the low voltage condition is detected, a first fail safe algorithm is enabled to disable the audio output, store an audio setting corresponding to the playing of the audio output, and to shutdown the multifunction handheld device.

Abstract: A programmable driver includes a first driver, a second driver, and a controller. The second driver is operably coupled in parallel with the first driver to drive a signal on to a line at a first drive level when a drive control signal is in a first state and wherein, when the drive control signal is in a second state, the second driver is in a high-impedance state such that the first driver drives the signal on to the line at a second drive level, wherein the first drive level is greater than the second drive level. The controller is operably coupled to generate the drive control signal based on load requirements of the line.

Abstract: A microphone bias circuit includes a first integrated circuit (IC) pin, a second IC pin, a first resistor, and a variable supply voltage buffer. The first resistor is operably coupled to the first IC pin and a return voltage. The second IC pin is operably coupled to receive analog signals from a microphone. The variable supply voltage buffer is operably coupled to produce a buffered supply voltage based on a variable impedance setting, wherein at least one off-chip component couples the second IC pin to the first IC pin and wherein the variable supply voltage buffer provides the buffered supply voltage to second IC pin as a microphone bias voltage.

Abstract: A battery-optimized system-on-a-chip includes multimedia module, a high-speed interface, a processing module, on-chip memory, and an on-chip DC-to-DC converter. The multimedia module operably coupled to produce rendered output data from input data received via the high-speed interface and/or from data stored in the on-chip memory. The high-speed interface is operably coupled to provide data to and from an external source. The on-chip memory is operably coupled to store at least a portion of a multimedia application, wherein the processing module processes input multimedia data in accordance with the multimedia application to produce output multimedia data. The on-chip DC-to-DC converter is operably coupled to convert a battery voltage into a supply voltage that is provided to the multimedia module, the high-speed interface, the processing module, and/or the on-chip memory.

Abstract: A method for efficient battery use begins by monitoring at least one output of the handheld device for an overload condition. The processing continues by monitoring a system voltage produced by a DC-to-DC converter for a system low voltage condition. The process continues by monitoring voltage of the battery for a battery low voltage condition. The processing then continues by enabling one of a plurality of fail-safe algorithms based on when one or more of the overload condition, the system low voltage condition, and/or the battery low voltage condition are detected.