Lcd Controller (Stm32L152Xx Only); Table 62. Lcd Controller Characteristics - STMicroelectronics STM32L151CB Manual

STM32L151x6/8/B, STM32L152x6/8/B
6.3.21

LCD controller (STM32L152xx only)

The embeds a built-in step-up converter to provide a constant LCD reference voltage
independently from the V
V pin to decouple this converter.
LCD
Symbol
V
LCD
V
LCD0
V
LCD1
V
LCD2
V
LCD3
V
LCD4
V
LCD5
V
LCD6
V
LCD7
C
ext
(1)
I
LCD
(2)
R
Htot
(2)
R
L
V
44
V
34
V
23
V
12
V
13
V
14
V
0
(3)
ΔVxx
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, not tested in production.
3. Based on characterization, not tested in production.
voltage. An external capacitor C
DD

Table 62. LCD controller characteristics

Parameter
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
V external capacitance
LCD
Supply current at V = 2.2 V
DD
Supply current at V = 3.0 V
DD
Low drive resistive network overall value
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
Segment/Common level voltage error
= -40 to 85 ° C
T
A
DocID17659 Rev 10
Electrical characteristics
must be connected to the
ext
Min Typ Max
- - 3.6
- 2.6
- 2.73
- 2.86
- 2.98
- 3.12
- 3.26
- 3.4
- 3.55
0.1 -
- 3.3
- 3.1
5.28 6.6 7.92
192 240 288
- - V
LCD
- 3/4 V
LCD
- 2/3 V
LCD
- 1/2 V
LCD
- 1/3 V
LCD
- 1/4 V
LCD
0 -
± 50
- -
Unit
-
-
-
- V
-
-
-
-
2 µF
-
µA
-
MΩ
kΩ
V
-
-
-
V
-
-
-
mV
103/129
103