STPM10 datasheet(30/47 Pages) STMICROELECTRONICS

30 / 47 page

Theory of operation

STPM10

30/47

DocID17728 Rev 5

Address

Name

Number

of bits

Description(1)

6-bit

binary

DEC

011110

011111

100000

CHP

8-bit unsigned data for secondary current channel

calibration. 256 values are possible. When CHS is 0 the

calibrator is at -12.5% of the nominal value. When CHS is

255 the calibrator is at +12.5%. The calibration step is then

0.098%

100001

100010

100011

100100

100101

100110

100111

101000

101001

101010

101011

101100

101101

101110

101111

110000

CRC

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

5: "Absolute maximum ratings")

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

CRC=1, cal = +10%

CRC=2, cal = -10%

110001

110010

Reserved

110011

Reserved

110100

Reserved

110101

CRIT

Selection of tamper threshold: CRIT=0: 12,5% / CRIT=1:

6,25%

110110

Reserved

110111

Reserved

Notes:

(1)These bits represent the MSB of the decimal value indicated in the description column

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.

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