STMicroelectronics Discovery kit for STM32L151/152 line - with STM32L152RC MCU STM32L152C-DISCO STM32L152C-DISCO Hoja De Datos
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STM32L152C-DISCO
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STM32L15xCC STM32L15xRC STM32L15xUC STM32L15xVC
Electrical characteristics
111
6.3.22 LCD
controller
The STM32L15xxC embeds a built-in step-up converter to provide a constant LCD
reference voltage independently from the V
reference voltage independently from the V
DD
voltage. An external capacitor C
ext
must be
connected to the V
LCD
pin to decouple this converter.
Table 65. LCD controller characteristics
Symbol
Parameter
Min
Typ
Max
Unit
V
LCD
LCD external voltage
-
-
3.6
V
V
LCD0
LCD internal reference voltage 0
-
2.6
-
V
LCD1
LCD internal reference voltage 1
-
2.73
-
V
LCD2
LCD internal reference voltage 2
-
2.86
-
V
LCD3
LCD internal reference voltage 3
-
2.98
-
V
LCD4
LCD internal reference voltage 4
-
3.12
-
V
LCD5
LCD internal reference voltage 5
-
3.26
-
V
LCD6
LCD internal reference voltage 6
-
3.4
-
V
LCD7
LCD internal reference voltage 7
-
3.55
-
C
ext
V
LCD
external capacitance
0.1
-
2
µF
I
LCD
(1)
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.
Supply current at V
DD
= 2.2 V
-
3.3
-
µA
Supply current at V
DD
= 3.0 V
-
3.1
-
R
Htot
(2)
2. Guaranteed by design, not tested in production.
Low drive resistive network overall value
5.28
6.6
7.92
M
R
L
High drive resistive network total value
192
240
288
k
V
44
Segment/Common highest level voltage
-
-
V
LCD
V
V
34
Segment/Common 3/4 level voltage
-
3/4 V
LCD
-
V
V
23
Segment/Common 2/3 level voltage
-
2/3 V
LCD
-
V
12
Segment/Common 1/2 level voltage
-
1/2 V
LCD
-
V
13
Segment/Common 1/3 level voltage
-
1/3 V
LCD
-
V
14
Segment/Common 1/4 level voltage
-
1/4 V
LCD
-
V
0
Segment/Common lowest level voltage
0
-
-
Vxx
(3)
3. Based on characterization, not tested in production.
Segment/Common level voltage error
T
T
A
= -40 to 85
C
-
-
50
mV