STPMS2L-PUR datasheet(11/33 Pages) STMICROELECTRONICS

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STPMS2

Application

Doc ID 16525 Rev 3

11/33

Application

The choice of external components in the transduction section of the application is a crucial

point in the application design, affecting the precision and the resolution of the entire

system.

Among the several considerations, a compromise should be found between the following

requirements:

Maximize the signal-to-noise ratio in the voltage and current channel

Choose the current-to-voltage conversion ratio Ks and the voltage divider ratio in a way

that calibration can be achieved

Choose Ks to take advantage of the whole current dynamic range in accordance with

desired maximum current and resolution.

To maximize the signal-to-noise ratio of the current channel, the voltage divider resistors

ratio should be as close as possible to those shown in Table 6.

Figure 4 below provides a reference application schematic diagram:

●

P = 64000 imp/kWh

●

INOM = 5 A

●

IMAX = 60 A

Typical sensitivity values for the current sensors are indicated inTable 6.

Figure 4.

Detailed application schematic

STPMS2H/L

cin

cip

vin

vip

MS3

CLK

DAT

DATn

1µ

C14

1µ

LOAD

VCC

CLK

R7 1K 1%

3.3 1%

R8 1K 1%

4.7n

E4622_X503

R4 150k

R3 150k

R2 150k

10n

470 1%

CLK

DAT

MS0 = CLK HP Ampl x 4

MS1 = 0

TC = 50 ppm/ C

MS2 = 0

Voltage c hannel ON, DAT =(CLK)? bs V: bs C

MS3 = 0

HardMode, BIST Mode OFF

1µ

AM09379v1

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