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UM2777 bảng dữ liệu(PDF) 13 Page - STMicroelectronics

tên linh kiện UM2777
Giải thích chi tiết về linh kiện  How to use the STEVAL-STWINKT1B SensorTile Wireless Industrial Node for condition monitoring and predictive maintenance applications
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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UM2777 bảng dữ liệu(HTML) 13 Page - STMicroelectronics

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2.3.1
Battery connectors
The battery supply voltage (VBAT) may be provided by connecting the 480 mA LiPo battery included in the
STWIN kit to the dedicated battery connector, or by supplying an external voltage through the J4 connector.
Figure 14. Battery and J4 connectors for VBAT supply
3 2 1
2
1 VBAT
GND
2.3.2
Power supply
The STWIN core system board can receive power from different sources:
•
V_USB: through micro USB connector [5 V]
•
Vin: through J5 connector [4.8-5.5 V]. The current on this port needs to be limited to 2 A
•
VBAT: lithium ion polymer battery (3.7 V, 480 mAh), STBC02 battery charger integrated in the board
The battery is always optional. The STBC02 battery charger automatically checks the available power inputs and
selects one to power the system. When the battery is connected as well as one of the other sources, the STBC02
automatically charges the battery.
When battery-powered, the equipment is intended to work properly with an operating temperature of 35°C.
Without the battery, the equipment is intended to work properly with an operating temperature of 45°C.
Figure 15. Power circuits
STWIN core system board
USB
3V3 DCDC
U14
CN3 (Wi-Fi)
STSAFE
5V
SYS (5V or VBAT)
CN2
(AMicArray)
CN2
CN1
VBAT
J5
STBC02
Battery
Charger
Analog Mic
OpAmp
U10
2.7 LDO
DCDC_1
DCDC_2
3V3_Ext
U16
3V3 DCDC
VEXT
J3
µSDCard
RS485
SYS
V_USB
5V
STM32L4+
Sensors
Bluetooth
low energy
UM2777
Power management
UM2777 - Rev 4
page 13/44



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