A1374LKB Allegro Microsystems Inc, A1374LKB Datasheet - Page 22

• Manufacturer Part Number: A1374LKB
• Description: IC SENSOR HALL EFFECT PREC 3-SIP
• Manufacturer: Allegro Microsystems Inc
• Type: Bipolar or Unipolar, Programmabler

Specifications of A1374LKB

• Sensing Range: 1.75mV/G ~ 11.25mV/G
• Voltage - Supply: 4.5 V ~ 5.5 V
• Current - Supply: 10mA
• Current - Output (max): 10mA
• Output Type: Analog, Ratiometric
• Features: High Precision
• Operating Temperature: -40°C ~ 150°C
• Package / Case: 3-SIP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

A1373
A1374
This example demonstrates the programming of the devices by
setting the register for Sensitivity Temperature Coefficient to
00110.
1. Power-on the system. This will reset the unprogrammed bits
2. Send one V
3. Send one V
4. Send one V
5. Send four V
6. Send one V
7. Send five V
Now we can measure the device output to see if this is the
desired value. We may find that the value we programmed is not
correct. So we will proceed to change it, as follows:
8. Send one V
We measure the device and find that this is the correct TC we
require. We are finished with trying values, and now want to set
the value permanently. In the following steps, remember that
blowing fuses is done one bit at a time.
9. Send one V
10. RESET the device by powering it off and on.
11. Send one V
12. Send two V
in all registers to 0. The device enters the Initial state.
mode). The TC register is reset to 00000 (assuming all of
those bitfields have intact fuses).
1 and 2: 00110).
device returns to the Mode Selection state.)
and
PH
PL
PH
PH
PL
PH
PH
PL
PL
PL
pulse to select Try Value mode.
pulse to enter the Register Selection state.
pulse to increase the code to 6 (setting bitfields
pulse to enter the Mode Selection state.
pulse to enter Bitfield Selection state (Write
pulses to set bitfields 0 and 2 (00101).
pulse to exit Bitfield Selection mode. (The
pulse to enter the Mode Selection state.
pulses to select Blow Fuse mode.
pulses to select the TC register.
High Precision, Output Pin Programmable
Programming Example
13. Send one V
14. Send four V
15. Send one V
16. Send four V
17. Send one V
One of the two bitfields is programmed. Now we program the
18. Repeat steps 10 to 15 to select the TC register again. This
19. Send two V
20. Send one V
After repeating the above steps to program all parameters, we
can lock the device:
21. RESET the device by powering it off and on.
22. Send one V
23. Send three V
24. Send one V
25. Send one V
26. Send one V
27. Programming the device is complete. Optionally, test the
Mode). The TC register is reset to 00000.
bitfield fuse is blown, and the device returns to the Mode
Selection state.
other bitfield.
time, however, the register resets to 00100, because bit 2 has
been permanently set.
bitfield fuse is blown, and the device returns to the Mode
Selection state.
do not need to select a register for locking the device).
bitfield fuse is blown, and the device returns to the Mode
Selection state.
results, or power-off the device.
Linear Hall Effect Sensor ICs
PH
PH
PH
PH
PH
PH
PL
PH
PL
PL
PL
PL
pulse to set the Lock bit to 1.
pulses to set bit 1 (00010, decimal 2).
pulse to enter the Register Selection state.
pulse to enter Bitfield Selection state (Write
pulse to exit Bitfield Selection state. The
pulse to exit Bitfield Selection state. The
pulse to enter the Mode Selection state.
pulse to enter the Bitfield Selection state. (We
pulse to exit Bitfield Selection state. The
pulses to select the TC register.
pulses to set bit 2 (00100, decimal 4).
pulses to select Lock Device mode.
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
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