A1373EKB datasheet(21/22 Pages) ALLEGRO

21 / 22 page

High Precision, Output Pin Programmable

Linear Hall Effect Sensors

A1373 and

A1374

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

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

in all registers to 0. The device enters the Initial state.

2. Send one VPH pulse to enter the Mode Selection state.

3. Send one VPL pulse to select Try Value mode.

4. Send one VPH pulse to enter the Register Selection state.

5. Send four VPL pulses to select the TC register.

6. Send one VPH pulse to enter Bitfield Selection state (Write

mode). The TC register is reset to 00000 (assuming all of

those bitfields have intact fuses).

7. Send five VPL pulses to set bitfields 0 and 2 (00101).

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 VPL pulse to increase the code to 6 (setting bitfields

1 and 2: 00110).

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 VPH pulse to exit Bitfield Selection mode. (The

device returns to the Mode Selection state.)

10. RESET the device by powering it off and on.

11. Send one VPH pulse to enter the Mode Selection state.

12. Send two VPL pulses to select Blow Fuse mode.

Programming Example

13. Send one VPH pulse to enter the Register Selection state.

14. Send four VPL pulses to select the TC register.

15. Send one VPH pulse to enter Bitfield Selection state (Write

Mode). The TC register is reset to 00000.

16. Send four VPL pulses to set bit 2 (00100, decimal 4).

17. Send one VPH pulse to exit Bitfield Selection state. The

bitfield fuse is blown, and the device returns to the Mode

Selection state.

One of the two bitfields is programmed. Now we program the

other bitfield.

18. Repeat steps 10 to 15 to select the TC register again. This

time, however, the register resets to 00100, because bit 2 has

been permanently set.

19. Send two VPL pulses to set bit 1 (00010, decimal 2).

20. Send one VPH pulse to exit Bitfield Selection state. The

bitfield fuse is blown, and the device returns to the Mode

Selection state.

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 VPH pulse to enter the Mode Selection state.

23. Send three VPL pulses to select Lock Device mode.

24. Send one VPH pulse to enter the Bitfield Selection state. (We

do not need to select a register for locking the device).

25. Send one VPL pulse to set the Lock bit to 1.

26. Send one VPH pulse to exit Bitfield Selection state. The

bitfield fuse is blown, and the device returns to the Mode

Selection state.

27. Programming the device is complete. Optionally, test the

results, or power-off the device.

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