(FR2744862-A1)      The control circuit (52) has a first input (70) that receives an encoded input signal generated in response to the initiation of a firing mode or diagnostic mode. The encoded input signal consists of code (100) and power (102) portions. The code portion consists of n pulses, having a predetermined frequency, where n is at least two. Logic circuitry (74) determines if the code portion of the received encoded input signal is valid, according to predefined conditions within a predetermined time window. The logic circuitry provides an unlocking signal at an output (76) when the code portion is determined to be valid.    A switch (78), having a control input, an input, and an output, is enabled on receipt of the unlocking signal such that power, including the power portion of the received encoded input signal, at the first input of the control circuit is supplied to the output of the switch to energise the igniter element. In the firing mode the power supplied via the enabled switch fires the igniter element.    ADVANTAGE -   Enhanced security for controlling power supplied to igniter element. Control circuit and igniter element can be integrated onto one igniter device chip that significantly improves EMC performance. Allows for more accurate diagnostics. Robust, and simple. Ensures that bad codes can be detected and control circuit reset for next received code. Only simple logic is needed for its implementation which reduces die size. May be implemented using CMOS technology which improves noise immunity and tolerance due to power supply variations.    (EP819071-A1)      The control circuit (52) has a first input (70) that receives an encoded input signal generated in response to the initiation of a firing mode or diagnostic mode. The encoded input signal consists of code (100) and power (102) portions. The code portion consists of n pulses, having a predetermined frequency, where n is at least two. Logic circuitry (74) determines if the code portion of the received encoded input signal is valid, according to predefined conditions within a predetermined time window. The logic circuitry provides an unlocking signal at an output (76) when the code portion is determined to be valid.    A switch (78), having a control input, an input, and an output, is enabled on receipt of the unlocking signal such that power, including the power portion of the received encoded input signal, at the first input of the control circuit is supplied to the output of the switch to energise the igniter element. In the firing mode the power supplied via the enabled switch fires the igniter element.    ADVANTAGE -   Enhanced security for controlling power supplied to igniter element. Control circuit and igniter element can be integrated onto one igniter device chip that significantly improves EMC performance. Allows for more accurate diagnostics. Robust, and simple. Ensures that bad codes can be detected and control circuit reset for next received code. Only simple logic is needed for its implementation which reduces die size. May be implemented using CMOS technology which improves noise immunity and tolerance due to power supply variations.    (JP11504704-W)      The control circuit (52) has a first input (70) that receives an encoded input signal generated in response to the initiation of a firing mode or diagnostic mode. The encoded input signal consists of code (100) and power (102) portions. The code portion consists of n pulses, having a predetermined frequency, where n is at least two. Logic circuitry (74) determines if the code portion of the received encoded input signal is valid, according to predefined conditions within a predetermined time window. The logic circuitry provides an unlocking signal at an output (76) when the code portion is determined to be valid.    A switch (78), having a control input, an input, and an output, is enabled on receipt of the unlocking signal such that power, including the power portion of the received encoded input signal, at the first input of the control circuit is supplied to the output of the switch to energise the igniter element. In the firing mode the power supplied via the enabled switch fires the igniter element.    ADVANTAGE -   Enhanced security for controlling power supplied to igniter element. Control circuit and igniter element can be integrated onto one igniter device chip that significantly improves EMC performance. Allows for more accurate diagnostics. Robust, and simple. Ensures that bad codes can be detected and control circuit reset for next received code. Only simple logic is needed for its implementation which reduces die size. May be implemented using CMOS technology which improves noise immunity and tolerance due to power supply variations.    (US5957988-A)      The control circuit (52) has a first input (70) that receives an encoded input signal generated in response to the initiation of a firing mode or diagnostic mode. The encoded input signal consists of code (100) and power (102) portions. The code portion consists of n pulses, having a predetermined frequency, where n is at least two. Logic circuitry (74) determines if the code portion of the received encoded input signal is valid, according to predefined conditions within a predetermined time window. The logic circuitry provides an unlocking signal at an output (76) when the code portion is determined to be valid.    A switch (78), having a control input, an input, and an output, is enabled on receipt of the unlocking signal such that power, including the power portion of the received encoded input signal, at the first input of the control circuit is supplied to the output of the switch to energise the igniter element. In the firing mode the power supplied via the enabled switch fires the igniter element.    ADVANTAGE -   Enhanced security for controlling power supplied to igniter element. Control circuit and igniter element can be integrated onto one igniter device chip that significantly improves EMC performance. Allows for more accurate diagnostics. Robust, and simple. Ensures that bad codes can be detected and control circuit reset for next received code. Only simple logic is needed for its implementation which reduces die size. May be implemented using CMOS technology which improves noise immunity and tolerance due to power supply variations.    (EP819071-B1)      The control circuit (52) has a first input (70) that receives an encoded input signal generated in response to the initiation of a firing mode or diagnostic mode. The encoded input signal consists of code (100) and power (102) portions. The code portion consists of n pulses, having a predetermined frequency, where n is at least two. Logic circuitry (74) determines if the code portion of the received encoded input signal is valid, according to predefined conditions within a predetermined time window. The logic circuitry provides an unlocking signal at an output (76) when the code portion is determined to be valid.    A switch (78), having a control input, an input, and an output, is enabled on receipt of the unlocking signal such that power, including the power portion of the received encoded input signal, at the first input of the control circuit is supplied to the output of the switch to energise the igniter element. In the firing mode the power supplied via the enabled switch fires the igniter element.    ADVANTAGE -   Enhanced security for controlling power supplied to igniter element. Control circuit and igniter element can be integrated onto one igniter device chip that significantly improves EMC performance. Allows for more accurate diagnostics. Robust, and simple. Ensures that bad codes can be detected and control circuit reset for next received code. Only simple logic is needed for its implementation which reduces die size. May be implemented using CMOS technology which improves noise immunity and tolerance due to power supply variations.