Apparatus for a single edge nibble transmission (SENT) multi transmission mode

1. An apparatus comprising:

a controller configured to encode an identifier of a device in a synchronization nibble of a single edge nibble transmission (SENT) signal by modifying a width of a calibration pulse in the synchronization nibble, wherein the SENT signal is being outputted by the device, and the synchronization nibble precedes a status or communication nibble in message frame of the SENT signal.

2. The apparatus of claim 1 , wherein to encode the identifier, the controller is configured to set a tick position in the synchronization nibble to start a transition from a logic low state to a logic high state.

3. The apparatus of claim 1 , wherein the controller is further configured to encode the identifier of the device in a cyclic redundancy check (CRC) nibble of the SENT signal.

4. The apparatus of claim 1 , wherein the controller is further configured to encode the identifier of the device in a data nibble of the SENT signal.

5. The apparatus of claim 1 , wherein the controller is configured to output the SENT signal with the encoded identifier to an electronic control unit (ECU), and the device and the ECU are parts of a vehicular sensor system.

6. The apparatus of claim 1 , wherein the controller is configured to:

listen to traffic on a communication bus;

in response to the traffic indicating the device is permitted to transmit the SENT signal to another device, output the SENT signal to the communication bus; and

in response to the traffic indicating the device is prohibited from transmitting the SENT signal to another device, continue to listen to the traffic on the communication bus.

7. The apparatus of claim 6 , wherein the device is connected to the communication bus, and the controller is configured to detect a reset request in traffic on the communication bus, and encode a reset signal in the synchronization nibble to start a reset process to determine a number of devices connected to the communication bus and to determine identifiers of the number of devices.

8. An apparatus comprising:

a controller configured to:

receive a single edge nibble transmission (SENT) signal from a device; and

decode an identifier of the device based on a width of a calibration pulse in a synchronization nibble of the received SENT signal to identify the device, wherein the synchronization nibble precedes a status or communication nibble in message frame of the SENT signal.

9. The apparatus of claim 8 , wherein to decode the identifier, the controller is configured to identify a tick position in the synchronization nibble of the SENT signal, wherein the tick position is a starting position of a transition from a logic low state to a logic high state of the synchronization nibble.

10. The apparatus of claim 8 , wherein the identifier is further encoded in a cyclic redundancy check (CRC) nibble of the SENT signal.

11. The apparatus of claim 8 , wherein the identifier is further encoded in a data nibble of the SENT signal.

12. The apparatus of claim 8 , wherein the controller is part of an electronic control unit (ECU), and the device and the ECU are parts of a vehicular sensor system.

13. A system comprising:

a receiver; and

a transmitter connected to the receiver, the transmitter being configured to:

encode an identifier of a device in a synchronization nibble of a single edge nibble transmission (SENT) signal by modifying a width of a calibration pulse in the synchronization nibble, wherein the transmitter is in the device, wherein the synchronization nibble precedes a status or communication nibble in message frame of the SENT signal; and

transmit the SENT signal with the encoded identifier to the receiver;

the receiver being configured to:

receive the SENT signal transmitted from the transmitter; and

decode the identifier of the device based on a width of a calibration pulse in the synchronization nibble of the SENT signal to identify the device.

14. The system of claim 13 , wherein to encode the identifier, the transmitter is configured to set a tick position in the synchronization nibble to start a transition from a logic low state to a logic high state of the synchronization nibble of the SENT signal.

15. The system of claim 13 , wherein to decode the identifier, the receiver is configured to identify a tick position in the synchronization nibble of the SENT signal, wherein the tick position is a starting position of a transition from a logic low state to a logic high state of the synchronization nibble of the SENT signal.

16. The system of claim 13 , wherein the transmitter is further configured to encode the identifier in a cyclic redundancy check (CRC) nibble of the SENT signal.

17. The system of claim 13 , wherein the transmitter is further configured to encode the identifier of the device in a data nibble of the SENT signal.

18. The system of claim 13 , wherein the transmitter is a part of the device, and the receiver is a part of an electronic control unit (ECU), and the device and the ECU are parts of a vehicular sensor system.

19. The system of claim 13 , wherein the transmitter is configured to:

listen to traffic on a communication bus; and

in response to the traffic indicating the device is permitted to transmit the SENT signal to another device, output the SENT signal to the communication bus; and

in response to the traffic indicating the device is prohibited from transmitting the SENT signal to another device, continue to listen to the traffic on the communication bus.

20. The system of claim 19 , wherein the transmitter is connected to the communication bus, and the transmitter is configured to detect a reset request in traffic on the communication bus, and encode a reset signal in the synchronization nibble to start a process to determine a number of transmitters connected to the communication bus and to determine identifiers of the number of transmitters.