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CSE7759B Datasheet(PDF) 12 Page - Core Technology (Shenzhen) Co., Ltd.

Part No. CSE7759B
Description  Calibration-free Electric Energy Measuring Chip
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Maker  CHIPSEA [Core Technology (Shenzhen) Co., Ltd.]
Homepage  http://www.chipsea.com/

 12 page
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This document is exclusive property of CHIPSEA and shall not be reproduced or copied or transformed to any other format
without prior permission of CHIPSEA
V2: Voltage signal on voltage channel pin;
����������������: Built-in crystal oscillator; typical frequency is about 3.579MHz;
����������������: Built-in reference source; typical frequency is about 2.43V;
Note: There exists noise in CSE7759B. Therefore, for the purpose of ensuring the amplitude
of properly measured effective values of current and voltage without signal input, current
effective value applied on channel V1P\V1N shall not be lower than 40uv and voltage applied on
channel V2P shall not be lower than 480uv. Please consult to technical support of the Company
when using.
3.3 Measuring Range
Different manganin resistors (1mR manganin resistor is recommended) selected will
influence current measuring range of CSE7759B directly.
The formula is as follows:
Full current measuring range(A)=
√2 ∗ manganin resistance(mR)
Such as: 1mR manganin resistor
Full current measuring range(A)=
√2 ∗ 1mR
≈ 30.9A
The current will reach ±2% accuracy within the scope of 500:1; namely, the current will
reach ±2% accuracy within current measuring range of 1mR manganin resistor 30.9A~0.0618A;
the accuracy will be larger than ±2% when the current is smaller than 0.0618A.
If there is noise in PCB, such noise will influence the measuring accuracy. Thus, accuracy
deviation caused by the noise in actual application should be taken into consideration as the
influence of the noise on the signal is high (Consult to the Company before printing PCB).
The influence of PCB noise on the signal may be detected at the CF pin (pin7) of
CSE7759B. Short-circuit at the manganin resistor. Observe when the current input signal is zero.
The larger manganin resistance is, the larger the signal frequency will be and the smaller the
cycle will be.
Voltage accuracy is ±2%.
Power measuring range will be determined by the current if the voltage is constant.

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