Hello,
I am trying to set up an STPM066S PMIC via OTP (One Time Programming), but without success so far.
I am struggling a bit with the description in section 6.7 of the STPM066S data sheet (Rev. 2).
a) Is a more detailed application note on OTP available?
b) Is a reference implementation of the SPI communication for OTP programming available? A protocol of a successful SPI communication would suffice as well, I think.
If not, can someone tell me, what response from the PMIC I should expect?
Currently, I do the following steps:
1) apply +20V to the VBAT1 pin
2) write to SAF_REG_OP: Set SAF_ADDR = "8"; SAF_CMD = "11" (simulation); SAF_AUTO_DOWNLOAD_FORCE = "1"
3) write OTP Row 8 to SAF_REG_DI
4) write SAF_REG_OP as above, with SAF_ADDR = "9"
5) write OTP Row 9 to SAF_REG_DI
6) write SAF_REG_OP as above, with SAF_ADDR = "11"
7) write OTP Row 11 to SAF_REG_DI
😎write SAF_REG_OP as above, with SAF_ADDR = "12"
9) write OTP Row 12 to SAF_REG_DI
Is this the correct way to do this? I am uncertain if I am doing this right. Also, the datasheet confuses me a little. For example, the OTP bit mapping table in Figure 22, shows the CRC in bits 0 to 2, but the SAF_REG_DI table in 6.9.3 shows CRC in bits 13 to 15.
How would the STPM066S response to SPI command during OTP? Should I get any response on the DO signal during OTP programming? Should it be possible to read registers before the IC was configured by OTP?
I would be grateful for any hints towards the right direction.
