Patent ID: 9239582
Filing Date: 2016-01-19
CPC Classification: G05F,G06F,G09G

Claim Text:
1. A timing control circuit for controlling a sequence of a first power supply voltage and a second power supply voltage when an electronic device is turned on or turned off, comprising: a first power supply voltage input configured to receive a first power supply voltage when the electronic device is turned on; a second power supply voltage input configured to receive a second power supply voltage when the electronic device is turned on; a third power supply voltage input configured to receive a third power supply voltage when the electronic device is turned on; a first output to be connected to a switch circuit and a working circuit of the electronic device, and to output the first power supply voltage to the working circuit of the electronic device; a second output to be connected to the second power supply voltage input and the working circuit, and to output the second power supply voltage to the working circuit of the electronic device; a switch circuit connected between the first power supply voltage input and the first output, and to control the first power supply voltage input to be connected to or disconnected from the first output; and a control circuit connected between the third power supply voltage input and the switch circuit, and to control the switch circuit to delay connecting the first power supply input to the first output after receiving the third power supply voltage when the electronic device is turned on, so that the first power supply voltage is supplied to working circuit later than the second power supply voltage when the electronic device is turned on, and further to control the switch circuit to disconnect the first power supply input and the first output immediately when the electronic device is shut down, so that the second power supply voltage is stopped to be supplied to the working circuit later than the first power supply voltage when the electronic device is shut down.