UM2408 Rev 2 27/51
UM2408 Hardware layout and configuration
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6.8 JP4 (IDD)
Jumper JP4, labeled IDD, is used to measure the STM32H7 microcontroller consumption by
removing the jumper and by connecting an ammeter:
• JP4 ON: STM32H7 is powered (Default position),
• JP4 OFF: an ammeter must be connected to measure the STM32H7 current. If there is
no ammeter, the STM32H7 is not powered.
As VDD is supplying level shifters U1 and U10, for very low power measurement, it is
recommended to set a pull-up, or pull-down, via SW for PA13, PB3, and PD8 pins.
Warning: On MB1363 Rev.C, VDD_MCU is also supplying Ethernet PHY
(U15) and debug voltage translation (U1 and U10).
On MB1363 Rev.C: If needed, for low power measurement (For example standby mode), in
order to measure only MCU (U7) power consumption, the user must remove the following
components: R4, R43, R44, R45, R46, R47, R48, R49, R50, R51, R52, R53, R59, R64, U1,
U10, U15, and SB72.
After removing these components, it becomes impossible to use Ethernet, and 1.8 V debug
with ST-LINK.
6.9 OSC clock
6.9.1 OSC clock supply
There are four ways to configure the pins corresponding to the external high-speed clock
(HSE):
• MCO from ST-LINK (Default): MCO output of ST-LINK is used as an input clock. This
frequency cannot be changed, it is fixed at 8 MHz and connected to the PH0-OSC_IN
of the STM32H7 microcontroller. The configuration must be:
–SB71 OFF
–SB72 ON
– SB3 and SB4 OFF
• HSE onboard oscillator from X2 crystal: for typical frequencies and its capacitors and
resistors, refer to the STM32H7 microcontroller datasheet and to the application note
Oscillator design guide for STM8AF/AL/S and STM32 microcontrollers AN2867 for the
oscillator design guide. The X2 crystal has the following characteristics: 25 MHz, 6 pF,
20 ppm. It is recommended to use NX2016SA-25MHz-EXS00A-CS11321
manufactured by NDK. The configuration must be:
– SB71 and SB90 OFF
– SB3 and SB4 ON
– C74 and C76 soldered with 5.1 pF capacitors
–SB72 OFF
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