Circuit Configuration for a Serial Communication With Wake Up Function
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Accused Products
Abstract
A circuit configuration for serial communication includes a first half for receiving and emitting sensing and/or actuating signals; a second half for receiving and emitting sensing and/or actuating signals, a two wire connecting line, which connects bidirectionally the first half and the second half of the circuit configuration; and a wake up switching device for waking up the first and second halves of the circuit configuration out of their standby mode without quiescent current. Independently of the switching state of the wake up switching device, a high level state at the output of a second low pass filter device holds a first switching device in its closing state, and a high level state at the output of a first low pass filter device holds a second switching device in its closing state, as a result of which a self-holding of the supply voltage is guaranteed.
14 Citations
25 Claims
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1-11. -11. (canceled)
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12. A circuit configuration for serial communication, comprising:
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a first half of the circuit configuration operatively configured to receive and emit at least one of sensing and actuating signals; a second half of the circuit configuration operatively configured to receive and emit the at least one of the sensing and actuating signals; a two wire connecting line bidirectionally coupling the first half of the circuit configuration and the second half of the circuit configuration; and a wake-up switching device operatively configured to wake-up the first half of the circuit configuration and the second half of the circuit configuration from a standby mode without quiescent current. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A method for waking-up from a standby mode without quiescent current a first half of a circuit and a second half of a circuit, said first and second halves being coupled via communication lines forming a bidirectional full duplex communication interface having a transfer rate of up to 20 Kbit/s, the method comprising the acts of:
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shifting a wake-up switching device arranged in the first half of the circuit into a closing state; shifting a first switching device in the first half of the circuit into a closing state; supplying a first transistor with an operating voltage; shifting an output of a first low pass filter into a high level state; shifting a second switching device in the second half of the circuit into a closing state; supplying a second transistor with the operating voltage; shifting an output of a second low pass filter into a high level state; and independently of a switching state of the wake-up switching device, holding the first switching device in the closing state via the high level state at the output of the second low pass filter, and holding the second switching device in the closing state via the high level state at the output of the first low pass filter.
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Specification