Table 31. Jp11 Jumper Settings During Idd Measurement With Calibration - ST 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 measured corresponds to offset of the differential amplifier.
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 = V
out measured

Table 31. JP11 jumper settings during IDD measurement with calibration

Jumper
JP11
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obtained corresponds to the sum of MCU supply current and the differential
.
offset
number representing the MCU supply current as
out
- V
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
Hardware layout and configuration
Section 2.30.2. The value
Section 2.30.2. The value
Description
.
offset
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