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A1365LKTTN-5-T Datasheet(PDF) 28 Page - Allegro MicroSystems

Part No. A1365LKTTN-5-T
Description  Low-Noise, High-Precision, Programmable Linear Hall-Effect Sensor IC
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Manufacturer  ALLEGRO [Allegro MicroSystems]
Direct Link  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

A1365LKTTN-5-T Datasheet(HTML) 28 Page - Allegro MicroSystems

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Low-Noise, High-Precision, Programmable Linear Hall-Effect Sensor IC
With High-Bandwidth (120 kHz) Analog Output and Integrated Fault Comparator
A1365
28
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Read (Controller to A1365)
The fields for the Read command are:
• Sync (2 zero bits)
• Read/Write (1 bit, must be 1 for read)
• Address (6 bits) (ADDR[5] is 0 for EEPROM, 1 for register)
• CRC (3 bits)
Figure 28 shows the sequence for a Read command.
Synchronize
MSB
Read/Write
0 0 1
Memory Address
CRC
0/1
0/1
0/1 0/1 0/1 0/1 0/1 0/1 0/1
Figure 28: Read Sequence
Read Acknowledge (A1365 to Controller)
The fields for the data return frame are:
• Sync (2 zero bits)
• Data (30 bits: [29:26] Don’t Care, [25:24] ECC Pass/Fail,
[23:0] Data)
• CRC (3 bits)
Figure 29 shows the sequence for a Read Acknowledge. Refer to
the Detecting ECC Error section for instructions on how to detect
and ECC failure.
Synchronize
MSB
Data
(30 bits maximum)
CRC
0 0
0/1 0/1
0/1 0/1
. . . 0/1 0/1 0/1 0/1 0/1
Figure 29: Read Acknowledge Sequence
Write (Controller to A1365)
The fields for the Write command are:
• Sync (2 zero bits)
• Read/Write (1 bit, must be 0 for write)
• Address (6 bits) (ADDR[5] is 0 for EEPROM, 1 for register;
refer to the address map)
• Data (30 bits: [29:24] Don’t Care, [23:0] Data)
• CRC (3 bits)
Figure 30 shows the sequence for a Write command. Bits [29:24]
are Don’t Care because the A1365 automatically generates 6 ECC
bits based on the content of bits [23:0]. These ECC bits will be
stored in EEPROM at locations [29:24].
Synchronize
MSB
MSB
Data
(30 bits maximum)
Read/Write
0 0 0
Memory Address
CRC
0/1
0/1
0/1 0/1 0/1 0/1 0/1 0/1 0/1 . . . 0/1 0/1 0/1 0/1
Figure 30: Write Sequence
Write Access Code (Controller to A1365)
The fields for the Access Code command are:
• Sync (2 zero bits)
• Read/Write (1 bit, must be 0 for write)
• Address (6 bits) (Address 0X24 for Customer Access)
• Data (30 bits) (0x2781_1F77 for Customer Access)
• CRC (3 bits)
Figure 31 shows the sequence for an Access Code command.
Synchronize
MSB
MSB
Data
(30 bits)
Read/Write
0 0 0
Memory Address
CRC
0
1
0 1 0 0 0/1 0/1 0/1 . . . 0/1 0/1 0/1 0/1
Figure 31: Access Code Write Sequence
The controller must open the serial communication with the
A1365 device by sending an Access Code. It must be sent within
Access Code Timeout (tACC ) from power-up or the device will
be disabled for read and write access.
Shadow Mode
For faster programming, Shadow Mode puts the sensor in a try
mode where one can write to the EEPROM registers as if they
are volatile registers. This is especially useful when searching
for Sensitivity, QVO, and Over Field Fault codes. Once the
desired codes are identified, the user should exit Shadow Mode
and execute an EEPROM Write. If a power-cycle is executed
during Shadow Mode, the registers will reset to their initial state.
SHADOW_ENABLE bit should be set to enter Shadow Mode.
Access Codes Information
Name
Serial Interface Format
Register Address
(Hex)
Data (Hex)
Customer
0x24
0x2781_1F77


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