UM1879 Rev 4 21/41
UM1879 Hardware layout and configuration
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10.13 MCU current ammeter
The jumper JP5, labeled Idd, allows the consumption of STM32L476VGT6 to be measured
directly by a built-in current ammeter circuit able to measure from 60nA to 50mA or by
removing the jumper and connecting an ammeter:
• Jumper on position OFF: STM32L476VGT6 is powered (default).
• Jumper on position ON: an on-board module is designed to measure from 60nA to
50mA by using several MOSFETs and switching automatically depending on the read
value.
• No jumper on JP5: an ammeter must be connected to measure the STM32L476VGT6
current through pin 1 and 2 (if there is no ammeter, the STM32L476VGT6 is not
powered).
Table 6. Connector CN2
Pin number Description Pin number Description
1 I2C1_SDA (PB7) 5 +3V3
2NC6NC
3 I2C1_SCL (PB6) 7 GND
4 EXT_RST(PD0) 8 NC
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