STPM11 datasheet(29/45 Pages) STMICROELECTRONICS

29 / 45 page

STPM11/12/13/14

Theory of operation

29/45

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.

100000

CHP

8-bit unsigned data for primary current channel calibration.

256 values are possible. When CHP is 0 the calibrator is at -12.5% of the

nominal value. When CHP is 255 the calibrator is at +12.5%. The calibration

step is then 0.098%.

100001

100010

100011

100100

100101

100110

100111

39 (1)

101000

CHS

STPM13/14 only

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%.

101001

101010

101011

101100

101101

101110

101111

47 (1)

110000

CRC

STPM11/13 only

2-bit unsigned data for calibration of RC oscillator. (see Typical characteristics

in)

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

CRC=1, cal=+10%;

CRC=2, cal=-10%

110001

49 (1)

110010

NOM

2-bit modifier of nominal voltage for Single Wire Meter.

NOM=0: KNOM=0.3594 / NOM=1: KNOM=0.3906 / NOM=2: KNOM=0.4219 /

NOM=3: KNOM=0.4531

110011

51 (1)

110100

ADDG

Selection of additional gain on current channels:

ADDG=0: Gain+=0 / ADDG=1: Gain+=8

110101

CRIT

STPM13/14 only

Selection of tamper threshold:

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

110110

LVS

Type of stepper selection:

LVS=0: pulse width 31.25 ms, 5V, / LVS=1: pulse width, 156.25 ms, 3V

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

Table 14.

Configuration bits map (continued)

Address

Name

N. of

bits

DESCRIPTION (1)

6-BIT

Binary

DEC

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