Receiver circuit with input common mode voltage sensing

A receiver circuit with input common mode voltage sensing, which is electrically connected with an output end of said receiver circuit of a controller area network (CAN) and applicable to a transceiver integration circuit of said controller area network, comprising:

• a resistor assembly, being electrically connected with a high end and a low end of said controller area network (CANH and CANL) and including a first resistor, a second resistor, a third resistor and a fourth resistor, wherein a first node is arranged between said first resistor and said second resistor, a second node is arranged between said third resistor and said fourth resistor, a third node (CT) is arranged between said second resistor and said third resistor, and wherein said first resistor is electrically connected with said high end and said first node, and said fourth resistor is electrically connected with said low end and said second node, and wherein said resistor assembly receives a high end voltage (VCANH) from said high end and a low end voltage (VCANL) from said low end and bucks voltage to generate and output a high end voltage division (VCANHDIV) at said first node, a low end voltage division (VCANLDIV) at said second node and a contact voltage (VCT) at said third node;
• a common mode voltage sensor, including a sense input end (SENSE_I) and a sense output end (SENSE_O), wherein said sense input end (SENSE_I) is electrically connected with a reference voltage source (VCMREF) and said sense output end (SENSE_O) is electrically connected to said third node of said resistor assembly (CT), and wherein a first input terminal (IN_P1), a second input terminal (IN_P2) and a third input terminal (IN_N) of said common mode voltage sensor are connected with and receiving said high end voltage division (VCANHDIV) from said first node, said low end voltage division (VCANLDIV) from said second node and said contact voltage (VCT) from said third node, respectively so as to generate and output a sense output voltage (VSENSE_O) at said sense output end (SENSE_O), and wherein said common mode voltage sensor determines:
• if {½*[VCANHDIV+VCANLDIV]}<{VCT−VTH_SEN} wherein VTH_SEN is a preset threshold offset value,
• then said sense output voltage (VSENSE_O) is set to a power source voltage (VCC);
• otherwise said sense output voltage (VSENSE_O) is equal to said reference voltage source (VCMREF);
• and
• a receiving amplifier, including a first receiving end (IN_R1) and a second receiving end (IN_R2) which are respectively connected to said first node of said resistor assembly and said second node of said resistor assembly to receive said high end voltage division (VCANHDIV) and said low end voltage division (VCANLDIV), such that said receiving amplifier accordingly generates a resultant signal, and outputs said resultant signal to said output end of said receiver circuit of said controller area network (CAN).

A receiver circuit with input common mode voltage sensing, which is electrically connected with an output end of said receiver circuit of a controller area network (CAN) and applicable to a transceiver integration circuit of said controller area network, comprising:

• a resistor assembly, being electrically connected with a high end and a low end of said controller area network (CANH and CANL) and including a first resistor, a second resistor, a third resistor and a fourth resistor, wherein a first node is arranged between said first resistor and said second resistor, a second node is arranged between said third resistor and said fourth resistor, a third node (CT) is arranged between said second resistor and said third resistor, and wherein said first resistor is electrically connected with said high end and said first node, and said fourth resistor is electrically connected with said low end and said second node, and wherein said resistor assembly receives a high end voltage (VCANH) from said high end and a low end voltage (VCANL) from said low end and bucks voltage to generate and output a high end voltage division (VCANHDIV) at said first node, a low end voltage division (VCANLDIV) at said second node and a contact voltage (VCT) at said third node;
• a common mode voltage sensor, including a sense input end (SENSE_I) and a sense output end (SENSE_O), wherein said sense input end (SENSE_I) is electrically connected with a reference voltage source (VCMREF) and said sense output end (SENSE_O) is electrically connected to said third node of said resistor assembly (CT), and wherein a first input terminal (IN_P1), a second input terminal (IN_P2) and a third input terminal (IN_N) of said common mode voltage sensor are connected with and receiving said high end voltage division (VCANHDIV) from said first node, said low end voltage division (VCANLDIV) from said second node and said contact voltage (VCT) from said third node, respectively so as to generate and output a sense output voltage (VSENSE_O) at said sense output end (SENSE_O), and wherein said common mode voltage sensor determines:
• if {½*[VCANHDIV+VCANLDIV]}>{VCT+VTH_SEN}, then said sense output voltage (VSENSE_O) is set to a ground voltage (GND);
• and
• if {½*[VCANHDIV+VCANLDIV]}<{VCT−VTH_SEN}, then said sense output voltage (VSENSE_O) is set to a power source voltage (VCC);
• and
• if {VCT−VTH_SEN}<{½*[VCANHDIV+VCANLDIV]}<{VCT+VTH_SEN}, then said sense output voltage (VSENSE_O) is equal to said reference voltage source (VCMREF), wherein VTH_SEN is a preset threshold offset value;
• and
• a receiving amplifier, including a first receiving end (IN_R1) and a second receiving end (IN_R2) which are respectively connected to said first node of said resistor assembly and said second node of said resistor assembly to receive said high end voltage division (VCANHDIV) and said low end voltage division (VCANLDIV), such that said receiving amplifier accordingly generates a resultant signal, and outputs said resultant signal to said output end of said receiver circuit of said controller area network (CAN).