Optional Lcd Power Supply Scheme; Current Consumption Measurement; Figure 12. Optional Lcd Power Supply Scheme; Figure 13. Current Consumption Measurement Scheme - ST STM32L15 QC Series Datasheet

STM32L151xC/C-A STM32L152xC/C-A
6.1.7

Optional LCD power supply scheme

Option 1
Option 2
1. Option 1: LCD power supply is provided by a dedicated VLCD supply source, VSEL switch is open.
2. Option 2: LCD power supply is provided by the internal step-up converter, VSEL switch is closed, an
external capacitance is needed for correct behavior of this converter.
6.1.8

Current consumption measurement

Figure 12. Optional LCD power supply scheme

V
DD
V
DD1/2/.../N
N x 100 nF
+ 1 x 10 μF
V
LCD
100 nF
V
C
EXT
V
SS1/2/.../N

Figure 13. Current consumption measurement scheme

A
+
-
DS10262 Rev 8
VSEL
Step-up
Converter
LCD
N x 100 nF
+1 x 10 μF
100 nF
+1 μF
Electrical characteristics
LCD
N x V
DD
N x V
SS
V
LCD
V
DDA
V
REF+
V
REF-
V
SSA
MS32462V2
MS33028V1
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