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公开(公告)号：WO1997045956A1
公开(公告)日：1997-12-04
申请号：PCT/US1997007242
申请日：1997-04-12
Applicant: MICROCHIP TECHNOLOGY, INC.
Inventor： MICROCHIP TECHNOLOGY, INC. , COOPER, Russell, E. , ELLISON, Scott
IPC: H03K03/0231
CPC classification number: H03K3/0231
Abstract: An RC oscillator circuit (10) within a microcontroller chip includes first and second comparators (16, 18) having their outputs respectively coupled to set and reset inputs of a flip-flop (20) whose output is coupled to a series RC network (22, 14) for controlling charging and discharging of a capacitor (14) of the RC network between precise high and low voltage levels (V2 and V1). One input of each comparator is coupled to the RC network, while the second input is coupled to a respective modified high and low threshold voltage level (Vh', V1'), so that the oscillator signal does not exceed the precise high and low voltage levels (V2, V1). The output frequency of the oscillator may be adjusted by selecting different values of the low voltage level (V1).
Abstract translation: 微控制器芯片内的RC振荡器电路（10）包括第一和第二比较器（16,18），它们的输出分别耦合到触发器（20）的输入耦合到串联RC网络（22）的触发器（20）的设置和复位输入 ，14），用于控制RC网络的电容器（14）在精确的高电平和低电压电平（V2和V1）之间的充电和放电。 每个比较器的一个输入端耦合到RC网络，而第二个输入耦合到相应修改的高和低阈值电压电平（Vh'，V1'），使得振荡器信号不超过精确的高低电压 水平（V2，V1）。 可以通过选择不同的低电平电平（V1）来调节振荡器的输出频率。
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2.发明授权
公开(公告)号：EP0775385B1
公开(公告)日：2000-02-02
申请号：EP96916577.8
申请日：1996-05-30
Applicant: MICROCHIP TECHNOLOGY INC.
Inventor： COOPER, Russell, E.
CPC classification number: H03K3/3545 , H03K3/012
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Patent Agency Ranking
公开(公告)号：EP0847572A1
公开(公告)日：1998-06-17
申请号：EP97931321.0
申请日：1997-06-26
Applicant: MICROCHIP TECHNOLOGY INC.
Inventor： NOLAN, James, B. , ELLISON, Scott , BOLES, Brian , DRAKE, Rodney , COOPER, Russell, E.
Abstract: A microcontroller (50) chip (51) includes a charge pump with a switched-capacitor (83) that develops a plurality of discrete voltages. A switched-capacitor (83) charging circuit selectively charges a capacitor to produce successive charges individually retrievable from the capacitor. An LCD driver (173) selectively transmits the discrete operating voltage levels to activate the LCD (10) according to status of an external system under the control of the microcontroller (50). Voltage losses that may occur during the switched-capacitor (83) charging are compensated to maintain the levels of the discrete operating voltages free of decay. Compensation is achieved by overcharging the capacitor (83) by an amount substantially equivalent to the amount of voltage loss on the capacitor, using active feedback obtained from monitoring the charge on the capacitor.
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公开(公告)号：EP0974198A1
公开(公告)日：2000-01-26
申请号：EP98952327.9
申请日：1998-10-15
Applicant: MICROCHIP TECHNOLOGY INC.
Inventor： COOPER, Russell, E.
IPC: H03M1/00
Abstract: Flash analog-to-digital (A/D) conversion is performed with an n-bit converter using a resistive-divider string in which tap points are taken between each pair of adjacent resistors of the string as one input to each of a respective plurality of 2n-1 comparators. Each of the comparators has a second input in common with all of the other comparators at which an analog input voltage to be converted to digital form is applied. A transition point occurs at one of the tap points at which immediately adjacent ones of the comparators exhibit outputs of different binary states for a given sample of the analog input voltage, signifying the transition point is occurring at the highest-order digital output at which the sampled analog input voltage exceeds a reference voltage. The transition point is detected during each sample, at a location within a group of consecutive ones of the comparators of preselected number considerably less than the total number of comparators in the converter. All of the comparators in the converter except those in the group containing the transition point are deactivated to conserve power during the conversion process for the given sample.
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公开(公告)号：EP0811191A1
公开(公告)日：1997-12-10
申请号：EP96939461.0
申请日：1996-10-10
Applicant: MICROCHIP TECHNOLOGY INC.
Inventor： NOLAN, James, B. , DELLACROCE, Brian , COOPER, Russell, E.
CPC classification number: G05D23/1917 , G06F11/3024 , G06F11/3058 , G06F11/3093 , H02J7/0004
Abstract: A microcontroller (10) for use in battery charging and monitoring applications is disclosed. The microcontroller (10) includes a microprocessor (12) and various front-end analog circuitry including a slope A/D converter (30) and a multiplexer for allowing a plurality of analog input signals to be converted to corresponding digital counts indicative of signal level. The microcontroller (10) further includes an on-chip temperature sensor (54) used in conjunction with the A/D converter (30), to monitor the temperature of the microcontroller (10). The temperature sensor (54) generates and uses a differential voltage that is obtained across the base-emitter junctions of two compatible bipolar transistors having dissimilar emitter areas. This differential voltage is proportional to temperature and may be sampled by the A/D converter (30) to obtain a digital count indicative of the temperature of the microcontroller (10).
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6.发明公开
公开(公告)号：EP0775385A1
公开(公告)日：1997-05-28
申请号：EP96916577.0
申请日：1996-05-30
Applicant: MICROCHIP TECHNOLOGY INC.
Inventor： COOPER, Russell, E.
CPC classification number: H03K3/3545 , H03K3/012
Abstract: An oscillator circuit (30, 40) for starting-up and operating at low voltages has been provided. The oscillator circuit includes an inverter circuit (31, 41) coupled across first and second terminals of a resonant circuit (14). The inverter circuit includes a push-pull driver stage having a P-channel transistor (18) and an N-channel transistor (20). The common drain electrodes of each are coupled to the second terminal of the resonant circuit. The source electrodes of the P- and N-channel transistors are respectively coupled to first and second supply voltage terminals. The gate electrode of the first transistor is coupled to the first terminal of resonant circuit. The inverter circuit further includes a circuit (32, 42) for shifting the voltage level applied to the gate electrode of the second transistor, relative to the voltage applied to the gate electrode of the first transistor, by a predetermined voltage. This has the effect of reducing the required operating voltage range of the inverter circuit while still maintaining both transistors active.
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公开(公告)号：EP0840952A1
公开(公告)日：1998-05-13
申请号：EP97922552.0
申请日：1997-04-12
Applicant: MICROCHIP TECHNOLOGY INC.
Inventor： COOPER, Russell, E. , ELLISON, Scott
IPC: H03K3
CPC classification number: H03K3/0231
Abstract: An RC oscillator circuit (10) within a microcontroller chip includes first and second comparators (16, 18) having their outputs respectively coupled to set and reset inputs of a flip-flop (20) whose output is coupled to a series RC network (22, 14) for controlling charging and discharging of a capacitor (14) of the RC network between precise high and low voltage levels (V2 and V1). One input of each comparator is coupled to the RC network, while the second input is coupled to a respective modified high and low threshold voltage level (Vh', V1'), so that the oscillator signal does not exceed the precise high and low voltage levels (V2, V1). The output frequency of the oscillator may be adjusted by selecting different values of the low voltage level (V1).
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