STPM066S datasheet(53/67 Pages) STMICROELECTRONICS

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6.9.5

SAF_REG_STAT

RESERVED

Address

0x34

[0] SAF_USR_PROTECT_STAT: SAF protection status for usr region; '1' means the SAF rows in user

region can't be burned or simulated;

[1] SAF_RES_PROTECT_STAT: SAF protection status for usr region; '1' means the SAF rows in trim

region can't be burned or simulated;

[2] STATUS_CRC_GLB: CRC checksum status for all rows;

[3] SAF_CRC_OK: CRC checksum status for current SAF row reading operation;

[4] SAF_BUSY: SAF is busy for reading/program or CRC checking;

[5] SAF_AUTO_DL_END: '1' means SAFauto download is ended;

[6] SAF_OPERATION_ERROR: Invalid SAF operation in OTP programing mode;

[7] CRC_BUSY: CRC busy flag;

[15:8] RESERVED

Note: This register is only accessible in OTP program mode.

6.10

Power down phase

When WKUP signal goes low, the device moves from any state to STANDBY status turning off all the regulators:

at first all the active regulators are switched off, then, after a delay time (Tdelay), the internal VREG is switched off

too.

6.11

Power up programming

According to the data written in OTP cells, we can have different power up phases.

After the Pre-regulator Buck is turned on, the power-up order of the other regulators can be selected, via OTP, as

follows:

•

000 = regulator is turned on only by SPI enable signal

•

001 = regulator is turned on after Buck regulator (second regulator)

•

010 = regulator is turned on as third one

•

011 = regulator is turned on as fourth one

•

111 = regulator is turned on only by SPI enable signal

STPM066S

Power down phase

DS12976 - Rev 2

page 53/67

STPM066S Datasheet(PDF) 53 Page - STMicroelectronics