STPMS2L-PUR datasheet(11/33 Pages) STMICROELECTRONICS

Nome de Peças	STPMS2L-PUR

Descrição Electrónicos	Smart sensor II dual-channel 1-bit, 4 MHz, second-order sigma-delta modulator with embedded PGLNA

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Fabricante Electrônico	STMICROELECTRONICS [STMicroelectronics]

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STPMS2

Application

Doc ID 16525 Rev 3

11/33

5

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:

1.

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

2.

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

that calibration can be achieved

3.

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

U1

STPMS2H/L

1

2

3

4

cin

5

cip

6

vin

7

vip

8

9

10

11

12

MS3

13

CLK

14

DAT

15

DATn

16

17

18

e3

19

e4

20

C5

1µ

C6

1µ

C14

1µ

C9

1µ

L

LOAD

N

VCC

CLK

R7 1K 1%

R6

3.3 1%

R8 1K 1%

C7

4.7n

C8

4.7n

L3

E4622_X503

R4 150k

R3 150k

R2 150k

C3

10n

R5

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

L1

1µ

VL

VN

AM09379v1

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Fabricante Electrônico	Nome de Peças	Folha de dados	Descrição Electrónicos
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