STM32L151xC STM32L152xC Electrical characteristics
The device embeds a built-in step-up converter to provide a constant LCD reference voltage independently from the V
DD
V
LCD
voltage. An external capacitor C
pin to decouple this converter.
ext
must be connected to the
Symbol
Table 65. LCD controller characteristics
Parameter Min Typ Max Unit
V
LCD
V
LCD0
V
LCD1
V
LCD2
V
LCD3
V
LCD4
V
LCD5
V
LCD6
V
LCD7
C ext
LCD external voltage
LCD internal reference voltage 0
LCD internal reference voltage 1
LCD internal reference voltage 2
LCD internal reference voltage 3
LCD internal reference voltage 4
LCD internal reference voltage 5
LCD internal reference voltage 6
LCD internal reference voltage 7 -
-
-
-
-
-
-
-
-
2.6
2.73
2.86
2.98
3.12
3.26
3.4
3.55
3.6
-
-
-
-
-
-
-
-
V
I
LCD
(1)
V
LCD
external capacitance
Supply current at V
DD
= 2.2 V
Supply current at V
DD
= 3.0 V
Low drive resistive network overall value
0.1
-
-
-
3.3
3.1
2
-
-
µF
µA
R
Htot
(2)
R
L
(2)
V
44
V
34
V
23
V
12
V
13
V
14
V
0
High drive resistive network total value
Segment/Common highest level voltage
Segment/Common 3/4 level voltage
Segment/Common 2/3 level voltage
Segment/Common 1/2 level voltage
Segment/Common 1/3 level voltage
Segment/Common 1/4 level voltage
Segment/Common lowest level voltage
5.28
192
-
-
-
-
-
-
0
6.6
240
-
3/4 V
2/3 V
1/2 V
1/3 V
1/4 V
-
LCD
LCD
LCD
LCD
LCD
7.92
288
V
LCD
-
-
-
-
-
-
M k
Ω
Ω
V
V
Δ Vxx
(3)
Segment/Common level voltage error
T
A
= -40 to 105 ° C
± 50 mV
1. LCD enabled with 3 V internal step-up active, 1/8 duty, 1/4 bias, division ratio= 64, all pixels active, no LCD connected.
2. Guaranteed by design.
3. Guaranteed by characterization results.
DocID022799 Rev 13 109/136
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