Wake-up interface and method for awakening an automotive electronics module
First Claim
1. A wake-up interface for awakening an automotive electronics module from an inactive state comprising;
- a plurality of input switches;
wake-up input switch interface means for generating a first current transient when one of said input switches is closed;
wake-up sense means including a first latch for detecting said first current transient and a second latch responsive to said first latch for providing a wake-up command signal; and
power control means responsive to said wake-up command for enabling module power.
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Accused Products
Abstract
A low quiescent current wake-up interface and method for awakening an automotive electronics module from its inactive state. In one particular aspect of the invention, the wake-up interface comprises at least one wake-up input switch (28A-I, 38A-I); wake-up input switch interface circuitry (30A-I, 36A-I) for generating a first current transient when one of the input switches (28A-I, 38A-I) is closed; and wake-up sense circuitry (40) responsive to the first current transient for providing a wake-up command signal. Preferably the wake-up sense circuitry (40) includes a first latch (102) for detecting the first current transient, a second latch (172) responsive to the first latch (102) for providing the wake-up command signal, and timing circuitry (128) for providing a time delay. In another aspect of the invention, a method for awakening an automotive electronics module having a microcontroller (32) and at least one wake-up input switch (38A-I) coupled thereto comprises the steps of: generating a first current transient when one of the input switches is closed; sensing the first current transient; and generating a wake-up command signal in response to the first current transient.
258 Citations
9 Claims
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1. A wake-up interface for awakening an automotive electronics module from an inactive state comprising;
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a plurality of input switches; wake-up input switch interface means for generating a first current transient when one of said input switches is closed; wake-up sense means including a first latch for detecting said first current transient and a second latch responsive to said first latch for providing a wake-up command signal; and power control means responsive to said wake-up command for enabling module power. - View Dependent Claims (2, 3, 4)
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5. A wake-up interface for an automotive electronics module comprising:
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interface means responsive to a plurality of input switches for generating a current transient when one of said input switches is closed; and sense means responsive to said interface means, said sense means including a first latch for detecting said current transient, timing means for providing a time delay, said timing means triggered by said first latch, and a second latch for providing a wake-up command signal after said time delay. - View Dependent Claims (6, 7, 8)
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9. A method for awakening an automotive electronics module having a microcontroller and at least one wake-up input switch coupled thereto comprising the steps of:
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generating a first current transient when one of the input switches is closed; sensing said first current transient; generating a second current transient after a predetermined time delay in response to said first current transient; detecting said second current transient; and triggering a wake-up command signal on said detection of said second current transient.
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Specification