Guru
Joined: 13/10/2014
Location: AustraliaPosts: 2165
| Posted: 01:03am 02 Mar 2019 |
From the Mucleo User Manual:
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Using VIN or E5V as an external power supply
When powered by VIN or E5V, it is still possible to use the ST-LINK for programming
or debugging only, but it is mandatory to power the board first using VIN or E5V,
then to connect the USB cable to the PC. In this way the enumeration succeeds,
thanks to the external power source.
The following power-sequence procedure must be respected:
1. Connect jumper JP3 between pin 1 and pin 2 for E5V or between
pin 5 and pin 6 for VIN
2. Check that JP1 is removed
3. Connect the external power source to VIN or E5V
4. Power on the external power supply 7 V< VIN < 12 V to VIN, or 5 V for E5V
5. Check that the green LED LD6 is turned ON
6. Connect the PC to the USB connector CN1
If this order is not respected, the board may be powered by USB (U5V) first,
then by VIN or E5V as the following risks may be encountered:
1. If more than 300mA current is needed by the board, the PC may be damaged or the
current supplied can be limited by the PC. As a consequence the board is not
powered correctly.
2. 300mA is requested at enumeration (since JP1 must be OFF) so there is risk that
the request is rejected and the enumeration does not succeed if the PC cannot
provide such current. Consequently the board is not power supplied (LED LD6 remains OFF).
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