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CSE7759B 데이터시트(PDF) 11 Page - Core Technology (Shenzhen) Co., Ltd. |
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CSE7759B 데이터시트(HTML) 11 Page - Core Technology (Shenzhen) Co., Ltd. |
11 / 25 page 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 11/25 error of CSE7759B without calibration may be controlled within ±3%. 1M resistor in voltage channel shall select high pressure resistant 1000V 1% resistor (or with higher accuracy); otherwise, it is necessary to divide into five 0805 1% (or with higher accuracy) resistors. It is necessary to protect complete machine being damaged in the process of use due to insufficient withstanding voltage of resistor. CSE7759B section collects strong current signal. As specified in safety regulation, the positions accessible to anybody shall be isolated. As shown in Figure 2, opto-isolator is used (the client may select isolation method of its own option and it is not limited). Select neutral line or live line as ground. It is recommended to use neutral line as ground. CSE7759B VDD V1P V1N V2P RI CF TI VSS 1MR 1% 1000V 1K 1% 33nF 33nF 220V Load 5V 1K 1% L live line 1K 1% Power Supply Module N neutral line L 1mR 1% manganin resistor 33nF 0.1uF 10uF UART neutral line as ground MCU 3.3V 4K7 8050 4K7 5V UART RX 4K7 3.3V 8050 Figure 3: Typical Application of CSE7759B (Non-isollation) Figure 3 shows CSE7759B non-isolation scheme. Operating voltage of MCU is 3.3V. If operating voltage of MCU is 5V, 200R resistor may be connected between TI and MCU. 3.2 Signal Frequency of Active Power ������������ 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; |
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