USR-WIFI232-B2 Hardware Manual
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Jinan USR IOT Technology Limited 5 / 9
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2. Hardware Design
2.1.
Typical Connection
2.2.
Power Interface
USR-WIFI232-B2 adopt single-voltage 3.3 V power supply. Peak current is about 350mA, work current is
about 200mA and sleep mode current is 100mA.
The power filter is recommended to be used near the connector of the user board, and it is recommended to
use two parallel decoupling capacitors with 100uF and 10uF to improve the stability of the system and
wireless performance.
2.3.
UART Interface
UART is serial data interface that can connect the RS-232 chip and transfer to the RS-232 level. UART
interface includes TXD/RXD/RTS/CTS.Take the RS-232 level as a reference circuit diagram as follows:
