SENT SAE J2716 Utility

SAE J2716 SENT Protocol Decoder

Decode SAE J2716 SENT fast-channel frames from nibble values or measured pulse tick counts. Inspect synchronization timing, status nibble, data nibbles, assembled sensor value, CRC nibble, pause pulse and total frame timing.

✓ Pulse Ticks ✓ Nibble Decode ✓ Status ✓ CRC ✓ Fast Channel

SENT

Fast-Channel Frame Decode

● Ready

Input Format Nibble mode expects status, data and CRC nibbles. Tick mode converts 12–27 tick data/status pulses to values 0–15.

Data Nibbles A common fast-channel frame uses six data nibbles, but SENT applications can define other supported message lengths.

Nominal Tick Time Used only for time estimates.

Tick Time Unit SAE J2716 transmitters commonly use a nominal tick time in the microsecond range.

SENT Frame Values Nibble mode: Status + selected number of Data nibbles + CRC. Values may be decimal 0–15 or hexadecimal 0x0–0xF.

Optional Pause Pulse Enter pause-pulse length in ticks if known. Leave blank when no pause pulse is being analyzed.

SENT pulse encoding: the synchronization/calibration pulse is nominally 56 ticks. Status, data and CRC nibble pulse periods encode nibble value N using 12 + N ticks, so a 12-tick pulse represents 0 and a 27-tick pulse represents 15.

SAE J2716 SENT Decode Result Decoded

Fast-Channel Data Value —

Status Nibble —

Data Nibbles —

Data Value Hex —

Data Value Decimal —

Received CRC —

Calculated CRC —

CRC Status —

Sync Pulse —

Encoded Pulses —

Frame Ticks —

Frame Time —

Pause Pulse —

#	Field	Nibble	Hex	Pulse Ticks	Pulse Time

SENT Decode Breakdown

—

What Is the SAE J2716 SENT Protocol?

SENT stands for Single Edge Nibble Transmission. It is a unidirectional digital communication protocol commonly used by automotive sensors to send measurement information to an electronic control unit.

Unlike protocols that encode information using conventional bytes and a separate clock line, SENT communicates values through the time between successive falling edges. Each status, data or CRC nibble is represented by a pulse period measured in protocol ticks.

SENT Pulse-to-Nibble Formula

Pulse Period =
12 + Nibble Value

Therefore:

Nibble Value =
Pulse Ticks - 12

The smallest ordinary nibble pulse is 12 ticks and represents hexadecimal 0. The largest is 27 ticks and represents hexadecimal F.

SENT Pulse Tick Table

Nibble	Pulse Length
0x0	12 ticks
0x1	13 ticks
0x2	14 ticks
0x3	15 ticks
0x4	16 ticks
0x5	17 ticks
0x6	18 ticks
0x7	19 ticks
0x8	20 ticks
0x9	21 ticks
0xA	22 ticks
0xB	23 ticks
0xC	24 ticks
0xD	25 ticks
0xE	26 ticks
0xF	27 ticks

SENT Synchronization / Calibration Pulse

A fast-channel SENT message begins with a synchronization or calibration pulse. Its nominal period is 56 ticks and allows the receiver to determine the transmitter’s actual tick duration before decoding the following nibble pulses.

Nominal Sync Pulse:
56 ticks

Example tick:
3 µs

Sync Pulse Time:
56 × 3 µs
= 168 µs

SENT Fast-Channel Frame Structure

Synchronization / Calibration Pulse
Status & Communication Nibble
Data Nibble 1
Data Nibble 2
...
Data Nibble N
CRC Nibble
Optional Pause Pulse

The number and interpretation of data nibbles depends on the sensor and its defined SENT message format. This decoder therefore assembles the nibbles numerically without inventing physical units such as pressure, temperature or position.

Status and Communication Nibble

The first nibble following synchronization is the Status and Communication Nibble. Its four bits may carry sensor status and serial-message-related information depending on the SENT implementation.

Because the precise semantic meaning is sensor-specific, the calculator shows the nibble in hexadecimal and binary rather than assigning unsupported fault or operating-state names.

SENT Fast-Channel Data Value

When several data nibbles form one numeric fast-channel value, they can be concatenated in transmission order. For example, six nibbles contain 24 bits of raw information.

Data Nibbles:

1 2 3 4 5 6

Combined Hex:
0x123456

Combined Decimal:
1193046

Whether those 24 bits represent one value, two 12-bit sensor values or another application-specific layout is defined by the sensor documentation.

SENT CRC Nibble

The fast-channel frame ends with a four-bit CRC nibble used to detect errors in the status and data nibbles. SAE J2716 has defined CRC behavior that has changed across protocol revisions and implementation profiles, so the calculator exposes its selected CRC model instead of assuming every sensor uses an undocumented variant.

This page uses the common SENT fast-channel CRC-4 implementation based on polynomial x⁴ + x³ + x² + 1, represented as 0x0D for the four-bit register update, with initial seed 0x05. Sensor documentation should remain the final authority when a device uses revision-specific CRC details.

SENT Pause Pulse

A pause pulse may follow the CRC nibble. It can be used to extend the total message duration so that consecutive frames maintain a desired repetition period.

The pause pulse does not represent another data nibble. If its length is known, this calculator can include it when estimating the total frame timing.

Example SENT Timing Calculation

Tick Time:
3 µs

Nibble:
0x5

Pulse Ticks:
12 + 5
= 17 ticks

Pulse Period:
17 × 3 µs
= 51 µs

SENT vs PWM

SENT should not be interpreted as ordinary PWM duty-cycle encoding. The information is determined primarily by the measured period between defined signal edges, expressed in units of the calibrated SENT tick.

That makes edge timing and correct synchronization-pulse measurement important when decoding oscilloscope, logic-analyzer or timer-capture data.

SAE J2716 SENT Protocol Decoder FAQs

What does SENT stand for?

SENT means Single Edge Nibble Transmission.

What standard defines SENT?

The automotive SENT protocol is specified by SAE J2716.

How is a SENT nibble encoded?

A nibble value from 0 to 15 is represented by a pulse period of 12 plus the nibble value in SENT ticks.

How many ticks represent SENT nibble 0?

Nibble 0 uses 12 ticks.

How many ticks represent hexadecimal F?

Nibble 0xF has value 15, so its nominal pulse period is 12 + 15 = 27 ticks.

How long is the SENT synchronization pulse?

Its nominal period is 56 SENT ticks.

What is the status nibble?

It is the four-bit Status and Communication Nibble transmitted after the synchronization pulse.

How many data nibbles does SENT use?

The application determines the fast-channel data length. Six nibbles are common, but the frame definition should be checked for the specific sensor.

What is the SENT CRC nibble?

It is a four-bit cyclic redundancy check transmitted after the fast-channel data nibbles to help detect message errors.

Can this decoder determine pressure or temperature automatically?

No. Physical scaling, offsets and the assignment of data nibbles are sensor-specific and require the sensor’s documentation.

What is a SENT pause pulse?

It is an optional pulse after the CRC used to control or extend the total message period.

Decode SENT Nibbles and Pulse Timing

Convert SAE J2716 pulse periods to nibble values, inspect status and data fields, assemble fast-channel values, check the CRC nibble and estimate SENT frame timing.