ST UM2967 User Manual

A jumper is fitted on each header, but an ammeter can replace any jumper for easy IDD measurement. Refer to
Figure 20 and Table 8.
Figure 20. Jumpers default configuration (JP1, JP2, and JP3)
DT56172V1
Some solder bridges or serial resistors are available on boards to measure the current of some microcontroller
and peripheral supply rails (refer to schematics for detailed possibilities).
Table 8. IDD configuration (JP1, JP2, and JP3)
Reference
Jumper
(1)
Function Comment
JP1
ON 3V3 connected to SMPS output SMPS powers 3V3. No current measurement.
OFF
3V3 not connected to SMPS
output
3V3 is not powered. Add an ammeter to power the
MCU and peripherals and measure the current.
JP2
ON VDD connected to SMPS output
SMPS powers VDD for peripherals. No current
measurement.
OFF
VDD not connected to SMPS
output
VDD is not powered. Add an ammeter to power the
peripherals and measure the current.
JP3
ON
VDD_MCU connected to SMPS
output
SMPS powers VDD_MCU. No current measurement.
OFF
VDD_MCU not connected to
SMPS output
VDD_MCU is not powered. Add an ammeter to
power the MCU and measure the current.
1. The default setting is in bold.
9.3.1 VDD_MCU
By default, the TPS62140 SMPS output to VDD_MCU is set to 1.8 V, to be compatible with the current design and
peripherals.
VDDIO2 is a power rail dedicated to a few PIOs (PG2 to PG15) and is independent of other GPIO power rails in
the microcontroller. VDDIO2 is set at 1.8 V by default (connected to VDD_MCU).
VBAT is connected to VDD_MCU by default (for voltage measurement capability). Thus, VDD_MCU can be
monitored through the internal ADC channel on ADC1/2/4 (VBAT/4).
9.3.2 Internal SMPS
An internal SMPS can supply power to a few IPs of the microcontroller. This internal SMPS is supplied by
VDD_MCU and enables very low power consumption figures in some power modes of the STM32U5A9NJH6Q
microcontroller.
9.3.3 Analog power supplies
VDDA is the external analog power supply for ADC converters, DAC converters, voltage reference buffers,
operational amplifiers, and comparators. It is connected to VDD_MCU by default, through a ferrite bead.
UM2967
Microcontroller power
UM2967 - Rev 1
page 23/68

ST UM2967 Specifications

General

Brand	ST
Model	UM2967
Category	Computer Hardware
Language	English