Multi-mode low current dual voltage self-regulated LCD pump system
View Patent ↗A bias voltage generator circuit may include a mode control circuit, a clock generator circuit coupled with the mode control unit and configured to generate a plurality of clock signals, and a charge pump circuit configured to receive the clock signals. The charge pump circuit may be coupled with the mode control circuit and operable to output selectable output voltages according to input from the mode control circuit. The output selectable voltages may depend upon the clock signals.
1. A bias voltage generator circuit comprising:
a mode control circuit;
a clock generator circuit coupled with the mode control unit and configured to generate a plurality of clock signals; and
a charge pump circuit configured to receive the clock signals, coupled with the mode control circuit, and further configured to output selectable output voltages according to input from the mode control circuit, the output selectable voltages to depend upon the clock signals, the clock signals to include non-overlapping pulses of a base signal and one or more phased signals.
2. The bias voltage generator circuit according to claim 1 , wherein the phased signals are to be selected according to specified output of the charge pump circuit.
3. The bias voltage generator circuit according to claim 1 , wherein the charge pump circuit is configured to output bias voltages based upon the presence of alternating ones of the phased signals.
4. The bias voltage generator circuit according to claim 1 , wherein the charge pump circuit is configured to output a voltage based on a number of different phased signals.
5. The bias voltage generator circuit according to claim 1 , wherein the charge pump circuit is configured to output a bias voltage with a current, the current based upon a number of different phased signals.
6. The bias voltage generator circuit according to claim 1 , wherein the mode control circuit is configured to select between a plurality of operating modes to define output of the charge pump circuit.
7. The bias voltage generator circuit according to claim 6 , wherein a first operating mode is configured to provide for a bias voltage with a first current for an LCD and a second operating mode is configured to provide the bias voltage with a second current for the LCD.
8. A microcontroller comprising:
a bias voltage generator circuit; and
an output routing circuit, the output routing circuit configured to route output from the bias voltage generator circuit to a display;
wherein the bias voltage generator circuit comprises:
a mode control circuit;
a clock generator circuit coupled with the mode control unit and configured to generate a plurality of clock signals; and
a charge pump circuit configured to receive the clock signals, coupled with the mode control circuit, and operable to output selectable output voltages according to input from the mode control circuit, the output selectable voltages to depend upon the clock signals, the clock signals to include non-overlapping pulses of a base signal and one or more phased signals.
9. The microcontroller according to claim 8 , wherein the phased signals are to be selected according to specified output of the charge pump circuit.
10. The microcontroller according to claim 8 , wherein the charge pump circuit is configured to output bias voltages based upon the presence of alternating ones of the phased signals.
11. The microcontroller according to claim 8 , wherein the charge pump circuit is configured to output a voltage based on a number of different phased signals.
12. The microcontroller according to claim 8 , wherein the charge pump circuit is configured to output a bias voltage with a current, the current based upon a number of different phased signals.
13. The microcontroller according to claim 8 , wherein the mode control circuit is configured to select between a plurality of operating modes to define output of the charge pump circuit.
14. The microcontroller according to claim 13 , wherein a first operating mode is configured to provide for a bias voltage with a first current for an LCD and a second operating mode is configured to provide the bias voltage with a second current for the LCD.
15. A method, comprising:
generating a plurality of clock signals; and
outputting selectable output voltages according to input from a mode control circuit, the output selectable voltages to depend upon the clock signals, the clock signals including non-overlapping pulses of a base signal and one or more phased signals.
16. The method according to claim 15 , wherein the phased signals are selected according to specified output of the charge pump circuit.
17. The method according to claim 16 , wherein:
in a first operating mode, providing a bias voltage with a first current for an LCD; and
in a second operating mode, providing the bias voltage with a second current for the LCD.
18. The method according to claim 15 , further comprising outputting bias voltages based upon the presence of alternating ones of the phased signals.
19. The method according to claim 15 , further comprising outputting a voltage based on a number of different phased signals.
20. The method according to claim 15 , further comprising outputting a bias voltage with a current, the current based upon a number of different phased signals.
21. The method according to claim 15 , further comprising selecting between a plurality of operating modes defining output of the output voltages.
22. A method, comprising:
providing a mode control circuit;
with a clock generator circuit coupled with the mode control unit, generating a plurality of clock signals;
with a charge pump circuit coupled with the mode control circuit:
receiving the clock signals; and
outputting selectable output voltages according to input from the mode control circuit, wherein the output selectable voltages depend upon the clock signals; and
providing a bootstrap circuit coupled between the clock generator circuit and the charge pump circuit.
23. A method, comprising:
generating a plurality of clock signals;
outputting selectable output voltages according to input from a mode control circuit, the output selectable voltages to depend upon the clock signals, the clock signals including non-overlapping pulses of a base signal and one or more phased signals;
in a first operating mode, providing a bias voltage for a 3V LCD; and
in a second operating mode, providing a bias voltage for a 5V LCD.
24. A method, comprising:
generating a plurality of clock signals;
outputting selectable output voltages according to input from a mode control circuit, the output selectable voltages to depend upon the clock signals, the clock signals including non-overlapping pulses of a base signal and one or more phased signals;
outputting a first voltage based upon the presence of a first number of different phased signals; and
outputting a second voltage based upon the presence of a second number of different phased signals;
wherein:
the second voltage is higher than the first voltage; and
the second number of different phased signals is greater than the first number of different phased signals.