Application of the SENT protocol with EL1262-0050
SAE J2716 SENT (Single Edge Nibble Transmission)
The SENT protocol is a point-to-point scheme for transmitting signal values from a sensor to a controller. It is intended to allow high resolution data transmission with a lower system cost than available serial data solutions. (1)
Hardware
The SENT protocol is a one-way, synchronous voltage interface which requires three wires: a signal line (low state < 0.5V, high state > 4.1V), a supply voltage line (5 V) and a ground line.
Protocol
Data is transmitted in units of 4 bits (1 Nibble). The interval between two falling edges (single edge) of the modulated signal with a constant amplitude voltage identifies the beginning of a frame and have to be evaluated on the receiver side.
A SENT message is 32 bits long (8 Nibbles) and consists of the following components:
- 24 bits of signal data (6 Nibbles) that represents 2 measurement channels of 3 Nibbles each (such as pressure and temperature)
- 4 bits (1 Nibble) for CRC error detection
- 4 bits (1 Nibble) of status/communication information
(1) SAE J2716 standard, sae.org, accessed 2011-09-13 |
Implementation of the Control
