Scan method for a touch panel and touch device

A scan method for a touch panel comprising steps of:

• executing a first Analog-to-Digital Converter calibration (ADC calibration) to get a first baseline and setting a first threshold based on the first baseline;
• driving i traces and receiving multiple first sensing signals of j traces simultaneously, wherein “i” and “j” are positive integers that are bigger than one;
• comparing the first sensing signals with the first threshold to determine whether at least one touch object exists;
• if the at least one touch object do exist, determining a coordinate of each one of the at least one touch object and going back to the step of driving the i traces.

A touch device comprising:

• a touch panel having p traces;
• a controller connecting to the touch panel and having
• a driving unit;
• a receiving unit having at least one sub-receiving unit to receive sensing signals simultaneously;
• a memory unit saving a first ADC calibration, a second ADC calibration, a cursory scan mode and a fine scan mode;
• and
• a processor executing following steps when started:
• controlling the driving unit to execute the first ADC calibration for the cursory scan mode, obtaining a first baseline by the receiving unit, setting a first threshold based on the first baseline, and storing the first baseline and the first threshold in the memory unit;
• controlling the driving unit to execute the second ADC calibration for the fine scan mode, obtaining a second baseline by the receiving unit, setting a second threshold based on the second baseline, and storing the second baseline and the second threshold in the memory unit.
• entering in the cursory mode or the fine scan mode:
• receiving multiple first sensing signals of j traces simultaneously by the at least one sub-receiving unit in the cursory mode and determining whether at least one touch object exists by the first sensing signals, wherein “j” is a positive integer that is bigger than one;
• receiving at least one second sensing signal of h traces simultaneously by the at least one sub-receiving unit in the fine scan mode and determining a coordinate of each one of the at least one touch object by the at least one second sensing signal, wherein “h” is a positive integer that is bigger than or equal to one.

A touch device comprising:

• a touch panel having p traces;
• a controller connecting to the touch panel and having
• a driving unit;
• a receiving unit having at least one sub-receiving unit to receive sensing signals simultaneously;
• and
• a processor;
• and
• a detecting circuit connecting to the touch panel and the controller and having
• a memory having
• a first register saving a first baseline;
• and
• a second register saving a first threshold;
• an ADC having an input connecting to the p traces of the touch panel to receive the sensing signals of the p traces simultaneously and to convert the sensing signals to corresponding sensing values;
• and
• a comparator having
• a first input connecting to an output of the ADC to acquire the sensing values;
• a second input connecting to the second register of the memory to acquire the first threshold;
• and
• an output of the comparator connecting to the processor,
• wherein the comparator compares the sensing values with the first threshold to determine whether the processor should be waked up.