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A1365 Datasheet(PDF) 30 Page - Allegro MicroSystems

Part No. A1365
Description  Low-Noise, High-Precision, Programmable Linear Hall-Effect Sensor IC
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Maker  ALLEGRO [Allegro MicroSystems]
Homepage  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

A1365 Datasheet(HTML) 30 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
30
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
EEPROM Cell Organization
Programming coefficients are stored in non-volatile EEPROM,
which is separate from the digital subsystem, and accessed by the
digital subsystem EEPROM Controller module. The EEPROM
is organized as 30-bit-wide words, each word is made up of 24
data bits and 6 ECC (Error Checking and Correction) check bits,
stored as shown in figure below.
External EEPROM Word Bit Sequence; C# – Check Bit, D# – Data Bit
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
EEPROM Bit
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
Contents
C5
C4
C3
C2
C1
C0
D23 D22 D21 D20 D19 D18 D17 D16 D15
EEPROM ECC Errors
Bits
Name
Description
29:26
No meaning
25:24
ECC
00 = No error
01 = Error detected and message corrected
10 = Uncorrectable error
11 = No meaning
23:0
D[23:0]
EEPROM data
EEPROM Error Checking and Correction
(ECC)
Hamming code methodology is implemented for EEPROM
checking and correction. The device has ECC enabled after
power-up.
The device always returns 30 bits.
The message received from controller is analyzed by the device
EEPROM driver and ECC bits are added. The first 6 received bits
from device to controller are dedicated to ECC.
Detecting ECC Error
If an uncorrectable error has occurred, bits 25:24 are set to 10, the
VOUT pin will go to a high-impedance state, and the device will
not respond to the applied magnetic field. Output voltage will go
to VBRK(HIGH) if a load resistor RL(PULLUP) is connected to VCC
or to VBRK(LOW) if a load resistor RL(PULLDWN) is connected to
GND.


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