Patent ID: 8493131
Filing Date: 2013-07-23
Classification: G06F,H02M

Abstract:
1. A capacitive touch panel detection circuit, comprising a boost circuit, a scanning circuit and a receiving circuit, wherein the boost circuit comprises a plurality of charge pumps in series, a sequence circuit and a voltage-stabilizing circuit, the charge pump comprising a first switch, a second switch, a third switch, a fourth switch, a first capacitor, and a second capacitor, the first end of the first switch being connected with the first end of the third switch in sequence as an input end of the charge pump, the second end of the first switch being connected with the first end of the second switch, the second end of the third switch being connected with the first end of the fourth switch, the first capacitor being connected between the second ends of the first and the third switches, the second end of the fourth switch being connected with the ground, one end of the second capacitor being connected with the second end of the second switch, the other end being connected with the ground, the second end of the second switch serving as an output end of the charge pump, the switches being controlled by the sequence circuit, during the first half working cycle of the charge pump, the first and the fourth switches being closed, and the second and the third switches being open, during the second half of the working cycle of the charge pump, the first and the fourth switches being open, and the second and the third switches being closed, wherein the boost circuit, the scanning circuit and the receiving circuit are all integrated into an IC chip, wherein said boost circuit for the capacitive touch panel detection circuit further comprises an off-chip voltage-stabilizing capacitor which comprises a low dropout (LDO) linear regulator, the output end of a final-stage charge pump being connected with the power end of a LDO linear regulator, the control end of the LDO linear regulator being connected with the reference voltage, the output end of the LDO linear regulator serving as the output end of the boost circuit, one end of the off-chip voltage-stabilizing capacitor being connected with the output end of the LDO linear regulator, the other end being connected with the ground, all of circuit components of the boost circuit except the off-chip voltage-stabilizing capacitor being integrated into an IC chip.