ATS344 datasheet(21/36 Pages) ALLEGRO

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High-Precision Linear Hall-Effect Sensor IC with Two-Wire

Current-Mode PWM Output and an Integrated Rare-Earth Pellet Package

ATS344

Allegro MicroSystems, LLC

955 Perimeter Road

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

www.allegromicro.com

The general format of a command message frame is shown in

Figure 14: General Format for Serial Interface Commands. Note

that, in the Manchester coding used, a bit value of 1 is indicated

by a falling edge within the bit boundary, and a bit value of zero

is indicated by a rising edge within the bit boundary.

The bits are described in Table 3.

Synchronize

MSB

Manchester Code per G. E. Thomas

Bit boundaries

Memory Address

Data

CRC

Read/Write

0 0 0/1 0/1 0/1 0/1 0/1 0/1

0 1 1

0/1 0/1 0/1 0/1

0/1

. . .

0/1 0/1

Figure 14: General Format for Serial Interface Commands

Table 3: Serial Interface Command General Format

Bits

Parameter Name

Values

Description

Synchronization

Used to identify the beginning of a serial interface command

Read/Write

[As required] Write operation

[As required] Read operation

Address

0/1

[Read/Write] Register address (volatile memory or EEPROM)

Data

0/1

[As required]

CRC

0/1

Incorrect value indicates errors

The following command messages can be exchanged between the

device and the external controller:

• Read

• Read Acknowledge

• Write

• Write Access Code

For EEPROM address information, refer to the EEPROM struc-

ture section.

SERIAL INTERFACE MESSAGE STRUCTURE

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