AS5247 – 24

ams Datasheet: 2014-Jun-20 [v1-02]

A p pl i c at io n I n f o r m at i o n

Burn and Verification of the OTP Memory

Step-by-step procedure to permanently program the

non-volatile memory (OTP):

The programming can either be performed in 5V operation

using the internal LDO (1uF on regulator output pin), or in 3V

Operation but using a supply voltage between 3.3V and 3.5V.

1.

Power on cycle

2.

Write the SETTINGS1 and SETTINGS2 registerswith the

Custom settings for this application

3.

Position the magnet at the desired zero position

4.

Read out the measured angle from the ANGLE register

5.

Write ANGLE [5:0] into the ZPOSL register and ANGLE

[13:6] into the ZPOSM register

6.

Read reg(0x0016) to reg(0x0019)

→ Read register step1

7.

Comparison of written content (settings and angle) with

content of read register step1

8.

If point 7 is correct, enable OTP read / write by setting

PROGEN = 1 in the PROG register

9.

Start the OTP burn procedure by setting PROGOTP = 1

in the PROG register

10. Read the PROG register until it reads 0x0000

(Programming procedure complete)

11. Clear the memory content writing 0x00 in the whole

non-volatile memory

12. Enable OTP read / write by setting PROGEN = 1 in the

PROG register

13. Set the PROGVER = 1 to set the Guard band for the guard

band test.(1)

14. Refresh the non-volatile memory content with the OTP

content by setting OTPREF = 1

15. Read reg(0x0016) to reg(0x0019)

→ Read register step2

16. Comparison of written content (settings and angle) with

content of read register step2.

Mandatory: guard band test

17. New power on cycle, if point 16 is correct. If point 16

successful and the device is incorrectly programmed. A

reprogramming is not allowed!

1. Guard band test:

- Restricted to temperature range: 25 °C ± 20 °C

- Right after the programming procedure (max. 1 hour with same

- Conditions 25°C ± 20 °C)

- Same VDD voltage

The guard band test is only for the verification of the burned OTP fuses during the programming sequence.

A use of the guard band in other cases is not allowed.

Application Information