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CSE7759B Datasheet(HTML) 21 Page - Core Technology (Shenzhen) Co., Ltd.

Part No. CSE7759B
Description  Calibration-free Electric Energy Measuring Chip
Download  25 Pages
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Maker  CHIPSEA [Core Technology (Shenzhen) Co., Ltd.]
Homepage  http://www.chipsea.com/
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CSE7759B Datasheet(HTML) 21 Page - Core Technology (Shenzhen) Co., Ltd.

 
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本资料为芯海科技专有财产,非经许可,不得复制、翻印或转变其他形式使用。
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
聚点滴之芯.成浩瀚之海
21/25
Internal DSP of CSE7759B has certain gain. Output frequency of active power may be
calculated through the following formula after passing through frequency conversion module:
������������=
����1 × ����2 × 48
����������������
2
×
����������������
128
V1: Voltage signal on current channel pin;
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.
For example: If the current is 5A, it will be a 1mR manganin resistor; if the voltage is 200V,
it will be a 1k divider resistor (Refer to circuit of Figure 2).
������������=
1�������� × 5���� × 200���� × 1����/1���� × 48
2.43����2
×
3.579������������
128
≈ 227Hz (Theoretical value)
3.7.2 Current Example of Electric Quantity Calculation
The serial port outputs overflow flags of 2byte number of pulses and 1bit number of pulses
(Adj.bit7). Value negation will occur to Adj.bit7 once when number of pulses is overflowing.
The user could calculate current electric quantity by accumulating number of pulses.
Note: Overflowing times of number of pulses =n; number of 2byte pulses =y
Current Electric Quantity Theoretical Value(kW. h)=
Total number of pulses
Number of pulses a kilowatt hour
=
���� × 65536 + ����
227�������� × 3600����
As for fixed hardware (manganin), one kilowatt hour generates fixed pulses. Thus, number
of pulses generated by kilowatt hour is a fixed value.


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