Data storage device adjusting range of microactuator digital-to-analog converter based on operating temperature
View Patent ↗A data storage device is disclosed comprising a disk, a head, and a microactuator configured to actuate the head over the disk. The data storage device further comprises control circuitry comprising a digital-to-analog converter (DAC) configured to generate a control signal applied to the microactuator. The control circuitry measures an operating temperature and then adjusts a range of the DAC based on the measured operating temperature.
1. A data storage device comprising:
a disk;
a head;
a microactuator configured to actuate the head over the disk; and
control circuitry comprising a digital-to-analog converter (DAC) configured to generate a control signal applied to the microactuator, the control circuitry configured to:
measure an operating temperature; and
adjust a range of the DAC based on the measured operating temperature.
2. The data storage device as recited in claim 1 , wherein the control circuitry is further configured to decrease the range of the DAC when the measured operating temperature increases.
3. The data storage device as recited in claim 1 , wherein adjusting the range of the DAC adjusts a resolution of the DAC.
4. The data storage device as recited in claim 3 , wherein the control circuitry is further configured to increase the resolution of the DAC when the measured operating temperature increases.
5. The data storage device as recited in claim 1 , wherein a gain of the microactuator increases when the operating temperature increases.
6. The data storage device as recited in claim 5 , wherein the control circuitry is further configured to limit a maximum amplitude of the control signal to prevent the control signal from damaging the microactuator.
7. A method of operating a data storage device comprising, the method comprising:
generating a control signal using a digital-to-analog converter (DAC);
applying the control signal to a microactuator configured to actuate a head over a disk;
measuring an operating temperature; and
adjusting a range of the DAC based on the measured operating temperature.
8. The method as recited in claim 7 , further comprising decreasing the range of the DAC when the measured operating temperature increases.
9. The method as recited in claim 7 , wherein adjusting the range of the DAC adjusts a resolution of the DAC.
10. The method as recited in claim 9 , further comprising increasing the resolution of the DAC when the measured operating temperature increases.
11. The method as recited in claim 7 , wherein a gain of the microactuator increases when the operating temperature increases.
12. The method as recited in claim 11 , further comprising limiting a maximum amplitude of the control signal to prevent the control signal from damaging the microactuator.