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DALLAS MAX1669 DRIVER
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Similarly, operational Dallas MAX1669 drives the gate of n-channel MOS gate-drive transistor The source Dallas MAX1669 n-channel MOS transistor gate-drive is coupled to a negative supply potential through n-channel MOS enable transistor The non-inverting input of operational amplifier is coupled to capacitor driven by constant-current source The non-inverting input of operational amplifier and the inverting input of operational amplifier are coupled to ground through resistor In the example shown in FIG. To turn on n-channel MOS power transistorcurrent source is turned on and charges capacitor at a linear rate.
The voltage on capacitor is amplified with a negative gain, producing a decreasing ramp voltage at the output of operational amplifier This causes a decreasing ramp voltage at the Dallas MAX1669 of p-channel gate drive transistor to turn on p-channel MOS power transistor The final gate voltage on the MOS power transistor is established by the IR drop across the gate-to-source resistor or and is determined by the current through the p-channel enable transistor If it is desired to turn on a p-channel MOS power transistor, n-channel enable transistor is turned on, current source is Dallas MAX1669 on and charges capacitor at a linear rate. The voltage on capacitor is amplified with a positive gain, producing an increasing ramp voltage at the output of operational amplifier This causes an increasing ramp voltage at the drain of n-channel gate drive transistor to turn on the p-channel MOS power transistor.
The feedback provided to the operational amplifiers and through resistor assures controlled ramp rates on the load. Persons of ordinary skill in the art will observe that the circuits shown in FIG.
Such skilled persons will appreciate that other interface circuits may be used. Internal interface circuit FIG.
Datasheet for THMC10 by Texas Instruments
More than one of each type of circuit may be included in Dallas MAX1669 tile, the exact number of each being Dallas MAX1669 matter of design choice. For example, a pair of buffers and may be provided. Buffers and are shown in FIG. Buffers and act as input buffers for the FPGA core.
Internal interface circuit may also include inverting buffer disposed between an input node and an output node A first programmable element is coupled between the input of buffer and the output node A second programmable element is coupled between the output of buffer and the output node To bypass bufferprogrammable element is programmed and programmable element is left unprogrammed, connecting input node directly to output node Dallas MAX1669 To place the buffer in the circuit, programmable element is programmed and programmable element is left unprogrammed, coupling input node to output node through buffer Buffer acts as an output buffer for the FPGA core.
In addition, a pair of programmable elements and may be connected in series between a logic-high voltage potential and a logic-low voltage potential.
The common connection between these programmable elements is used as an output node to drive, for Dallas MAX1669, the gate of transistor or in FIG. According to an illustrative embodiment of the invention, power for the analog portion of the ADC may be 3. These supply voltages may Dallas MAX1669 generated on chip from the 1.
US7116181B2 - Voltage- and temperature-compensated RC oscillator circuit - Google Patents
Alternatively, 3. A high-precision voltage is needed as a reference voltage input to the ADC or Dallas MAX1669 be generated within the ADC This voltage may be scaled from an on chip Bandgap voltage source using known techniques.
Such a bandgap reference is shown in FIG. A first grounded-base PNP transistor has a resistor coupled between its emitter and the output of operational amplifier A second grounded base pnp transistor has a pair of resistors and coupled between its emitter and the output of operational amplifier The emitter of transistor is coupled to the non-inverting input of operational amplifier and the common connection of resistors and is coupled to the inverting input of operational amplifier The output voltage V ref of the operational amplifier is given by the expression shown in FIG. A separate power source for the bandgap reference is useful for reducing the risk of coupling noise from FPGA sources.
MTG Elo Project
The output of the bandgap reference may also be used for controlling the level of on-chip generated analog supplies. The output of the bandgap reference may be supplied to the non-volatile memory NVM blocks if the particular NVM being used requires a stable reference voltage e. The bandgap reference circuit is used to generate a reference voltage that will be used by other analog Dallas MAX1669 as well as the ADC of FIG. The operational amplifier is not necessarily but advantageously powered by a 3.
Although the V ref output of the circuit is voltage- process- and temperature-independent, the minimum voltage supply required Dallas MAX1669 the operational amplifier is about 1. Hence it is preferably supplied by a 3.
More sophisticated methods for fan control are digital interface Dallas MAX1669 circuits (ICs) equipped with remote temperature sensors, e.g., MAX (Dallas. The MAX evaluation system consists of a. MAX evaluation kit (EV kit) and a companion board that demonstrates the MAX fan controller g: Dallas.