A31316 datasheet(33/61 Pages) ALLEGRO

33 / 61 page

3D Magnetic Position Sensor IC

A31316

Allegro MicroSystems

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

Table 19: SENT Message Frame Definitions

Section

Description

Synchronization and Calibration

Function

Provide the external controller with a detectable start of the message frame. The large quantity of ticks distinguishes this

section for ease of distinction by the external controller.

Syntax

Nibbles: 1

Quantity of ticks: 56

Quantity of bits: 1

Status and Communication

Function

Provides the external controller with the status of the A31316 and indicates the format and contents of the Data section.

Syntax

Nibbles: 1

Quantity of ticks: 12 to 27

Quantity of bits: 4

1:0 Device status

3:2 Message serial data protocol

Data

Function

Provides the external controller with data selected by the sent_data_sel parameter.

Syntax

Nibbles: 3 to 6

Quantity of ticks: 12 to 27 (each nibble)

Quantity of bits: 4 (each nibble)

CRC

Function

Provides the external controller with cyclic redundancy check (CRC) data for certain error detection routines applied to the

Data nibbles and to the Status information.

Syntax

Nibbles: 1

Quantity of ticks: 12 to 27 (each nibble)

Quantity of bits: 4

Pause Pulse

Function

Additional time can be added at the end of a SENT message frame to ensure all message frames are of appropriate length

and correlate to the internal update rate of the device.

Syntax

Nibbles: N/A

Quantity of ticks: Varies

Quantity of bits: N/A.

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