STPM10 datasheet(30/51 Pages) STMICROELECTRONICS

30 / 51 page

Theory of operation

STPM10

30/51

Doc ID 17728 Rev 3

As indicated above, the STPM10 includes 56 CFG bits. The CFG bits are not retained when

the STPM10 supply is not available and they are cleared when a POR occurs, but they are

not cleared when a remote reset command (RRR) is sent through SPI.

Normally, some of these bits must be loaded during power-up of the application. From the

microcontroller, it could also reload the configuration and calibration values after power-on

restart.

7.18

Mode signals

The STPM10 includes 8 mode signals located in the DFP data record. 3 of these are used

only for internal testing purposes while 5 are useful to change some of the operations of the

STPM10. The mode signals are not retained when the STPM10 supply is not available and

they are cleared when a POR occurs, but they are not cleared when a remote reset

command (RRR) is sent through SPI.

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

(see Section 7.19).

110000

CRC

2-bit unsigned data for calibration of RC oscillator. (see Table 5)

CRC=0, or CRC=3 cal=0%

CRC=1, cal=+10%;

CRC=2, cal=-10%.

110001 49 (1)

110010

Reserved

110011

Reserved

110100

Reserved

110101

CRIT

Selection of tamper threshold:

CRIT=0: 12,5% / CRIT=1: 6,25%

110110

Reserved

110111

Reserved (always set to 1 after production testing of die)

IMPORTANT: This bit represents the MSB of the decimal value indicated in the description column.

Table 11.

Configuration bit map (continued)

Address

Name

n. of

bits

Description (1)

6-bit

binary

DEC

Table 12.

Mode signal description

Bit #

Signal

name

Bit

value

Status

Binary

command

Hex

command

BANK

Used for RC startup procedure

0111000x

70 or 71

1111000x

F0 or F1

Reserved

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