Lcd Controller (Stm32L152Xx Only); Table 57. Lcd Controller Characteristics - STMicroelectronics STM32L151CB Manual

STM32L151xx, STM32L152xx
6.3.20

LCD controller (STM32L152xx only)

The STM32L152xx embeds a built-in step-up converter to provide a constant LCD reference
voltage independently from the V
to the V
LCD
Table 57.
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.
DD
pin to decouple this converter.
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
Doc ID 17659 Rev 6
voltage. An external capacitor C
Min
0.1
5.28
192
0
Electrical characteristics
must be connected
ext
Typ Max
3.6
2.6
2.73
2.86
2.98
3.12
3.26
3.4
3.55
2
3.3
3.1
6.6 7.92
240 288
V
LCD
3/4 V
LCD
2/3 V
LCD
1/2 V
LCD
1/3 V
LCD
1/4 V
LCD
± 50
95/109
Unit
V
µF
µA
MΩ
kΩ
V
V
mV