Introduction - STMicroelectronics SPC572L series Reference Manual

RM0400
49 SENT Receiver (SRX)
49.1

Introduction

The Single Edge Nibble Transmission (SENT) Receiver (SRX) module is a multi-channel
receiver for receiving serial data frames which are being transmitted by a sensor
implementing the SENT encoding scheme and present them to the CPU for further
processing.
This module is based on the SAE J2716 information report titled "SENT - Single Edge
Nibble Transmission for Automotive Applications" and released on January 27, 2010 ,
Apr2007 and Feb2008. As per this standard, the SENT protocol is intended for use in
applications where high resolution sensor data needs to be communicated from a sensor to
an Engine Control Unit (ECU). It is intended as a replacement for the lower resolution
methods of 10 bit A/Ds and PWM and as a simpler low-cost alternative to CAN or LIN. The
implementation assumes that the sensor is a smart sensor containing a microprocessor or
dedicated logic device (ASIC) to create the signal.
The SENT encoding scheme is a unidirectional communications scheme from the sensor /
transmitting device to the controller /receiving device which does not include a coordination
signal from the controller/receiving device. The sensor signal is transmitted as a series of
pulses with data encoded as falling to falling edge periods.
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