AS5170 datasheet(28/47 Pages) AMSCO

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[v1-01] 2016-Apr-11

AS5170 − Register Description

The Status and Communication nibble includes diagnostic

status and the Short Serial Message Format, as defined in the

SAE J2716 protocol.

Figure 36:

Status and Communication Nibble

The Short Serial Message is transmitted one bit per SENT frame

in bit 2 of consecutive frames and consists of 16 bits. The

starting bit of a Short Serial Message is indicated by a 1 in bit 3

(Message Start) of the Status and Communication Nibble.

Figure 37:

Serial Message

The Short Serial Message consists of a message ID (SENTMID)

and the magnitude of the magnetic field (MAG). The Short Serial

Message is protected by a 4-bit CRC.

The SENTESM bit enables the Short Serial Message, which is

otherwise by default disabled.

The angular information is contained in nibbles 2, 3 and 4.

Nibbles 5 and 6 contain a rolling counter which counts the

number of sent telegrams and rolls over to 0 after reaching the

maximum value of 255. The rolling counter can be disabled,

which is not needed in the Single Sensor mode, with the SENTRC

bit.

Because the tick clock period is 3 μs, the minimum duration of

a SENT telegram is 456 μs, while the maximum duration is 816

μs. the SENTPP bit enables the Pause Pulse, which creates a SENT

transmission with a constant duration of 272 ticks.

Bit

Description

Error bit: 0 = no sensor error, 1 = sensor error

0 (always)

Short Serial Message

Message Start

SENT Message Number

123456789

Message Start

100000000

Short Serial Message[2]

SENTMID

MAG

CRC

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