WCM3720A Datasheet, PDF (2/4 Pages) Winson Semiconductor Corp. – AC Sensing Current Module with Digital Data output

WCM3720A
Iset Table
User can set Iset to detect passing current. The selection table shown as following:
S3 S2 S1 S0
Iset
S3 S2
S1
S0
Iset
1
1
1
1
15A
0
1
1
1
7A
1
1
1
0
14A
0
1
1
0
6A
1
1
0
1
13A
0
1
0
1
5A
1
1
0
0
12A
0
1
0
0
4A
1
0
1
1
11A
0
0
1
1
3A
1
0
1
0
10A
0
0
1
0
2A
1
0
0
1
9A
0
0
0
1
1A
1
0
0
0
8A
0
0
0
0
X
Note: 1: Open the jumper
0: Short the jumper
X: No limit
If the measured current is more than the setting maximum current, then the CONT will output a high-level
signal.
Normally, the CONT pin is kept in low-level.
Pad Description
Pad No Pad Name
1
CONT
2
DRX
3
DTX
4
SYNC
5
SW1
6
GND
7
VDD
I/O
Description
The over-current indicator. If the current ≧Iset , the CONT pin
O will outputs high level. Otherwise, the CONT pin outputs low
level.
I The data of measured current output. Its output is UART
O communication. The baud rate is 2.4K bits/sec.
The SYNC pin indicates the output of data. It will output low
O level when the UART is start and output high level when URAT
is terminated
I Reserve
― The system ground
― The positive power input pin
Electrical Characteristics
Symbol Parameter
Test Condition
Min. Typ. Max. Unit
VDD Condition
V_DD
Operation Voltage
－
－
4.0 5.0 12.0
V
I_DD
Operation Current
5V Without Loading － 20 25
mA
P_OP
Measureable Current 5V
－
Range
0.1 － 20
A
Top
Operating temperature －
－
﹣20 － 85
℃
T_ST
Store temperature
－
－
﹣30 － 125
℃
Measured Current Data Output
The measured current can be transmitted by UART format. There are total 7 bytes of data will be output. For
example, if the measured data is “5.376”A, then the output data is ‘0’, ‘5’, ‘3’, ‘7’, ‘6’, ‘\r’,‘\n’, total of 7 bytes;
the output data is ASCII code. If the measured data is “10.76” A, then the output data is ‘1’, ‘0’, ‘7’, ‘6’, ‘0’,
‘\r’,‘\n’, total of 7 bytes.
Winson reserves the right to make changes to improve reliability or manufacturability.
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