STPM11 datasheet(28/43 Pages) STMICROELECTRONICS

28 / 43 page

Theory of operation

STPM11/12/13/14

28/43

7.16

Mode signals

The STPM1X includes four Mode signals. These signals change some of the operation of

the STPM1X. The mode signals are not retained when the STPM1X supply is not available

and then they are cleared when a POR occurs.

The mode signals bit can be written using the normal writing procedure of the CFGI

interface (see CFGI par. 7.17)

– RD mode signal has been already described in par. 7.15 (configuring the STPM1X),

but there is another implied function of the signal RD. When it is set, each sense

amplifier is disconnected from corresponding anti-fuse 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 transforms the MOP and MON pins to act

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

Figure 23.).

This feature is useful in order to boost the VCC supply voltage of the STPM1X to

generate the VOTP voltage (14V to 20V) needed to program the OTP anti-fuse

elements.

– CSEL (STPM13/14 only). Under normal operating conditions, if anti-tamper module is

not activated (see PST configuration bits) the STPM1X will selects channel 1 as the

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 by setting CSEL mode bit.

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

fuse element. When this bit is not set, any writing 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 anti-fuse element.

Table 15.

Mode signals description

Signal

Name

Bit

Value

Status

Binary

Command

Hex

Command

PUMP

MOP and MON operate normally

0111000x

70 or 71

MOP and MON provide the driving signals to implement a

charge-pump DC-DC converter

1111000x

F0 or F1

CSEL

Current Channel 1 selected when tamper is disabled

0111100x

78 or 79

Channel 2 selected when tamper is disabled

1111100x

F8 or F9

The 56 Configuration bits originated by OTP anti-fuses

0111101x

7A or 7B

The 56 Configuration bits originated by shadow latches

1111101x

FA or FB

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 anti-fuse elements

1111110x

FC or FD

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