Table 31. Jp11 Jumper Settings During Idd Measurement With Calibration - STMicroelectronics STM32L476G-EVAL User Manual

UM1855
Calibration procedure and current measurement compensation steps:
•
On JP11, short terminals 1,2 and open terminals 3,4. The current through the shunt
resistor is now zero.
•
Run low-power-mode IDD measurement as described in
V
offset
•
On JP11, add a second jumper, to short terminals 3 and 4, then remove the jumper
from terminals 1,2 of JP11. The MCU supply has not been interrupted and the supply
current now passes through the shunt resistor.
•
Run low-power-mode IDD measurement as described in
V
measured
amplifier's offset V
•
The software computes a V
V
out

Table 31. JP11 jumper settings during IDD measurement with calibration

Jumper
JP11
measured corresponds to offset of the differential amplifier.
obtained corresponds to the sum of MCU supply current and the differential
.
offset
= V - V
measured offset
Setting
JP11
Configuration used to measure V
JP11 in VDD position
1 2 3 4
STM32L476ZGT6 supply current does not flow through shunt
resistor.
JP11
Configuration to transit from direct to shunted supply to
1 2 3 4
STM32L476ZGT6, without ever interrupting the MCU supply.
JP11
Default setting.
Configuration used to measure the MCU supply current.
1 2 3 4
JP11 in IDD position
STM32L476ZGT6 supply current flows through shunt resistor.
DocID027351 Rev 3
number representing the MCU supply current as
out
Hardware layout and configuration
Section 2.30.2. The value
Section 2.30.2. The value
Description
.
offset
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