STPM01 datasheet(35/56 Pages) STMICROELECTRONICS

35 / 56 page

STPM01

Theory of operation

35/56

– RD mode signal has been already described in the SPI section but there is another

implied function of the signal RD. When it is set, each sense amplifier is disconnected

from corresponding antifuse element and this way, its 3V NMOS gate is protected

from the high voltage of VOTP during permanent write operation. This means that as

long as the VOTP voltage reads more than 3V, the signal RD should be set.

– PUMP: when set, the PUMP mode signal transform the MOP and MON pins to act as

driving signals to implement a charge-pump DC-DC converter (see schematic page

36). This feature is useful in order to boost the VCC supply voltage of the STPM01 to

generate the VOTP voltage (14V to 20V) needed to program the OTP antifuse

elements.

– CSEL In normal operation, if the anti-tamper module is not activated (see PST

configuration bits) the STPM01 will select the channel 1 as source of current

information. For debug or calibration purposes it is possible to select channel 2 as

source of current channel signal when the tamper module is disabled. This is done

setting CSEL mode bit.

– WE (write Enable): This mode signal is used to permanently write to the OTP antifuse

element. When this bit is not set, any write to the configuration bit is recorded in the

shadow latches. When this bit is set the writing is recorded both in the shadow latch

and in the OTP antifuse element.

– Precharge: this command swaps the sequence of data record read, allowing the

reading of the last four data records as first and the first four as second. The reading

sequence will be 5,6,7,8,1,2,3,4. Differently from the other mode signals, the

precharge command is not retained inside the STPM01, in fact it should be sent each

time before the reading of the data records. This is the only command that can be

sent to STPM01 when the TSTD bit has been set.

Table 17.

Mode signals description

Bit #

Signal

Name

Bit

Value

Status

Binary

Command

Hex

Command

Reserved

1PUMP

MOP and MON operates normally

0111001x

72 or 73

MOP and MON provides the driving signals to implement a

charge-pump DC-DC converter

1111001x

F2 or F3

Reserved

CSEL

Current Channel 1 selected when tamper is disabled.

0111100x

78 or 79

Channel 2 selected when tamper is disabled.

1111100x

F8 or F9

5RD

The 56 Configuration bits originated by OTP antifuses

0111101x

7A or 7B

The 56 Configuration bits originated by shadow latches.

1111101x

FA or FB

6WE

Any writing in the configuration bits is recorded in the

shadow latches.

0111110x

7C or 7D

Any writing in the configuration bits is recorded both in the

shadow latches and in the OTP antifuse elements.

1111110x

FC or FD

Precharge

Swap the 32 bits data records reading. From

1,2,3,4,5,6,7,8, to 5,6,7,8,1,2,3,4 and viceversa.

1111111x

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