DWCS1700

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© Winson, 2021/5/31

Page 5

Application Note:

(1) Operating Mode:

(1.1) Continuous mode: Continuously transmit current data. Reset need to

pull low the RST pin to GND.

(1.2) Professional mode: Measure current data and reset according to the

command, RX received command and please refer to the commands< Table

1>.

(2) Measurement Method:

(2.1) AC measurement: After power-on, the sensor will automatically reset

the current value when no current passes through the sensor and the

current value can be also manually reset to zero. Data update rate is 2

Data /sec.

(2.2) DC measurement: After power-on, the current value must be manually

reset to zero when no current passes through the sensor. Data update rate

is 10 Data /sec.

(2.3) When measuring DC current, the sensor will generate an amount of

remanence. If this remanence cause reading error, please re-reset it.

(2.4) The proper use of reset function will make the measurement more

accurate.

(3) Measured Current Data Output:

The measured current can be transmitted by UART format.

(3.1)

If the measured data is AC “1.23”A, then the output data is ‘~’, ‘1’, ‘.’,

‘2’, ‘3’, ‘0’, ‘\r’, ‘\n’, total of 8 bytes; the output data is ASCII code. If the

measured data is “10.45” A, then the output data is ‘~’, ‘1’, ‘0’, ‘.’, ‘4, ‘5, ‘\r’,

‘\n’, total of 8 bytes.

(3.2)

If the measured data is +DC “1.23”A, then the output data is ‘+’, ‘1’, ‘.’,

‘2’, ‘3’, ‘0’, ‘\r’, ‘\n’, total of 8 bytes; the output data is ASCII code.

(3.3) If the measured data is -

DC “1.23”A, then the output data is ‘-’, ‘1’, ‘.’,

‘2’, ‘3’, ‘0’, ‘\r’, ‘\n’, total of 8 bytes; the output data is ASCII code.

y = -0.1333x + 1.6664

R²= 0.9999

0.985

0.990

0.995

1.000

1.005

1.010

1.015

4.9

4.95

5

5.05

5.1

VDD(V)

DWCS1700 Relative Current Change Standardization of Supply Voltage 5V VS. Supply Voltage