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CSE7759B Fiches technique(PDF) 13 Page - Core Technology (Shenzhen) Co., Ltd.

No de pièce CSE7759B
Description  Calibration-free Electric Energy Measuring Chip
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Fabricant  CHIPSEA [Core Technology (Shenzhen) Co., Ltd.]
Site Internet  http://www.chipsea.com/
Logo CHIPSEA - 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
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3.4 Serial Port Protocol
Relevant parameters of voltage, current, power and electric quantity could be read by the
user through UART serial port protocol (RI and TI) and voltage, current, power and electric
quantity could be obtained through calculation. At present, this serial port only supports baud
rate of 4800bp (with allowable error of ±2%). Receive port RI is reserved temporarily and does
not have actual function. The serial port will transmit data pockets of voltage coefficient, voltage
cycle, current coefficient, current cycle, power coefficient, power cycle, calibration times and
number of CF pulses through TI (transmit data in hexadecimal system).
Specific format of the data pocket is composed of: Packet header (2*(1byte data+1bit even
parity check))→voltage coefficient (3*(1byte data +1bit even parity check))→voltage cycle
(3*(1byte data +1bit even parity check))→current coefficient (3*(1byte data +1bit even parity
check))→current cycle (3*(1byte data +1bit even parity check))→power coefficient (3*(1byte
data
+1bit
even
parity
check))→power cycle (3*(1byte data +1bit even parity
check))→calibration times (1*(1byte data +1bit even parity check))→number of CF pulses
(2*(1byte data +1bit even parity check))→Packet tail(1bytedata +1bit even parity check).
24byte totally; 54.912ms is used at 4800bps.
Figure 4: Schematic Diagram of UART Data
Table 3-1
Data Symbol
Data Name
High Byte
Medium Byte
Low Byte
Voltage coefficient
Ukh
Ukm
Ukl
Voltage cycle
Uth
Utm
Utl
Current coefficient
Ikh
Ikm
Ikl
Even
Parity
Check
Byte No. data flow
Stop
Bit
Start
Bit


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