-
公开(公告)号：ES2144243T3
公开(公告)日：2000-06-01
申请号：ES96916577
申请日：1996-05-30
Applicant: MICROCHIP TECH INC
Inventor： COOPER RUSSELL E
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.
-
Patent Agency Ranking
公开(公告)号：EP0847572A4
公开(公告)日：1999-10-20
申请号：EP97931321
申请日：1997-06-26
Applicant: MICROCHIP TECH 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.
-
公开(公告)号：EP0811191A4
公开(公告)日：1999-02-03
申请号：EP96939461
申请日：1996-10-10
Applicant: MICROCHIP TECH 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).
-
4.发明公开ACCURATE RC OSCILLATOR HAVING PEAK-TO-PEAK VOLTAGE CONTROL 失效RC-OSZILLATOR MIT SPITZENSPANNUNGSSTEUERUNG
公开(公告)号：EP0840952A4
公开(公告)日：1998-12-23
申请号：EP97922552
申请日：1997-04-12
Applicant: MICROCHIP TECH INC
Inventor： COOPER RUSSELL E , ELLISON SCOTT
IPC: H03K3/0231
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: 公开了一种位于微控制器芯片内的精确RC振荡器电路，用于产生准确地在两个精确电压电平（即低电压（VL）和高电压（VH））之间振荡的预定频率的信号。 振荡器电路使用其输出的第一和第二比较器分别耦合到触发器的设置和复位输入。 触发器的输出耦合到串联RC网络，用于控制跨越RC网络的电容器的电压的充电和放电。 串联RC网络的互连耦合到第一和第二比较器的输入端。 第一比较器的另一输入端耦合到用于施加高电压的修改的高阈值版本（VH'）的电路，使得由振荡器电路产生的信号不超过精确的高电压（VH）。 类似地，第二比较器的另一输入耦合到用于施加低电压的修改的低阈值版本（VL'）的电路，使得由振荡器电路产生的信号不会低于该精确低电压（VL）。 此外，提供了用于为低电压（VL）选择不同输入电压的装置，使得可以调节振荡器的期望输出频率以在高电压（VH）和所选择的低电压（VL）之间精确地振荡。
-
公开(公告)号：EP0780035A4
公开(公告)日：1998-12-23
申请号：EP96925272
申请日：1996-07-09
Applicant: MICROCHIP TECH INC
Inventor： COOPER RUSSELL E
IPC: H03K3/011 , H03K3/0231
CPC classification number: H03K3/011 , H03K3/0231
Abstract: An accurate RC oscillator circuit (10) for generating a signal of a predetermined frequency that accurately oscillates between two precise voltage levels, i.e., a low threshold voltage (VL) and a high threshold voltage (VH) is disclosed. The oscillator circuit uses first and second comparators (16, 18) having their outputs respectively coupled to set and reset inputs of a flip flop (20). The output of the flip flop is coupled to a series RC network for controlling the charging and discharging of the voltage across a capacitor (14) of the RC network. The interconnection (12) of the series RC network is coupled to an input of both the first and second comparators. The other input of the first comparator is coupled to a circuit (24) for applying a modified version (V'H) of the high threshold voltage such that the signal generated by the oscillator circuit does not exceed the precise high threshold voltage (VH). Likewise, the other input of the second comparator is coupled to a circuit (25) for applying a modified version (V'L) of the low threshold voltage such that the signal generated by the oscillator circuit does not fall below the precise low threshold voltage (VL).
Abstract translation: 一种用于产生准确地在两个精确电压电平（即，低阈值电压（VL））和高阈值电压（VH）之间振荡的预定频率的信号的精确RC振荡器电路（10）。 振荡器电路使用其输出的第一和第二比较器（16,18）分别耦合到触发器（20）的设置和复位输入。 触发器的输出耦合到串联RC网络，用于控制跨越RC网络的电容器（14）的电压的充电和放电。 串联RC网络的互连（12）耦合到第一和第二比较器的输入端。 第一比较器的另一输入耦合到电路（24），用于施加高阈值电压的修正版本（V'H），使得由振荡器电路产生的信号不超过精确的高阈值电压（VH） 。 类似地，第二比较器的另一个输入耦合到电路（25），用于施加低阈值电压的修正版本（V'L），使得由振荡器电路产生的信号不会低于精确的低阈值电压 （VL）。
-
6.发明公开
公开(公告)号：EP0775385A4
公开(公告)日：1998-08-19
申请号：EP96916577
申请日：1996-05-30
Applicant: MICROCHIP TECH 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.
-
-
-
-
-
Search Results
6
records
(took 0.025 seconds)
