UM0240 Datasheet, PDF (7/39 Pages) STMicroelectronics – ST Industrial Communication Board - EVALCOMMBOARD

UM0240
2
Power supply
Power supply
Board components require the following voltage supplies.
Table 1. Voltages present on board
Function
Supply Converter
Device
Input Range Output Value
Main Power
Supply
VDD
Switching
Converter
(Buck)
L5973D
5V ÷ 35V
5V
MCU Flash
Programming
VPP
Regulated
Charge Pump ST662A (pin VOUT)
Converter
Vdd
12V
OpAmp negative
supply
-5V
Non regulated
Charge Pump
ST662A (pin C1-)
Vdd
-5
These supplies are all derived from an input power supply that can be taken from four
different sources:
1. PLM 10V: connected to the 10V line of the PLM connector
2. 5V Motor: connected to the 5V line of the Motor connector
3. Phone Jack: external connector, compatible with common notebook power supply
connectors, bringing power supply in the 5V÷ 35V range
4. USB 5V: connected to the 5V line of the USB supply
This enhanced flexibility of source and source voltage selection coexists due to diodes D7,
D8, D10 and D12, which prevent the reverse current flowing in the supply inputs, keeping
different sources independent.
The higher voltage input will be the dominant supply.
LED D11 is turned on when the power supply is active.
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