Low power detection of stylus touch down

A method for operating a stylus device, comprising:

• monitoring an output of a pressure sensor of the stylus device using an analog comparator, the pressure sensor coupled to a tip of the stylus device;
• determining, using the analog comparator, that the output of the pressure sensor is greater than a first threshold value, the first threshold value indicative of physical contact between the tip of the stylus device and a surface;
• activating, at a first time, an analog-to-digital converter in response to the determining;
• measuring, at the first time, a first output of the pressure sensor using the analog-to-digital converter to obtain a first measurement of a first pressure detected by the pressure sensor;
• de-activating the analog-to-digital converter in response to measuring the first output;
• re-activating, at a second time, the analog-to-digital converter based on the first measurement being greater than a second threshold value;
• measuring, at the second time, a second output of the pressure sensor using the analog-to-digital converter to obtain a second measurement of a second pressure detected by the pressure sensor;
• de-activating the analog-to-digital converter in response to measuring the second output;
• determining, after a time period, that a third output of the pressure sensor is less than or equal to the second threshold value, the second threshold value indicating no physical contact between the tip of the stylus device and the surface;
• and
• re-monitoring the output of the pressure sensor using the analog comparator in response to the third output being less than or equal to the second threshold.