Datasheet

STM32L100C6, STM32L100R8/RB Electrical characteristics
DocID024295 Rev 1 93/102
6.3.19 LCD controller
The STM32L100xx embeds a built-in step-up converter to provide a constant LCD 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 58. 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 MΩ
R
L
(2)
High drive resistive network total value 192 240 288 kΩ
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
ΔVxx
(3)
3. Based on characterization, not tested in production.
Segment/Common level voltage error
T
A
= -40 to 85 ° C
± 50 mV