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DS10198 Rev 8 203/270
STM32L476xx Electrical characteristics
238
6.3.25 LCD controller characteristics
The devices embed 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
VLCD pin to decouple this converter.
Table 90. LCD controller characteristics
(1)
Symbol Parameter Conditions Min Typ Max Unit
V
LCD
LCD external voltage - - 3.6
V
V
LCD0
LCD internal reference voltage 0 - 2.62 -
V
LCD1
LCD internal reference voltage 1 - 2.76 -
V
LCD2
LCD internal reference voltage 2 - 2.89 -
V
LCD3
LCD internal reference voltage 3 - 3.04 -
V
LCD4
LCD internal reference voltage 4 - 3.19 -
V
LCD5
LCD internal reference voltage 5 - 3.32 -
V
LCD6
LCD internal reference voltage 6 - 3.46 -
V
LCD7
LCD internal reference voltage 7 - 3.62 -
C
ext
V
LCD
external capacitance
Buffer OFF
(BUFEN=0 is LCD_CR register)
0.2 - 2
F
Buffer ON
(BUFEN=1 is LCD_CR register)
1-2
I
LCD
(2)
Supply current from V
DD
at
V
DD
= 2.2 V
Buffer OFF
(BUFEN=0 is LCD_CR register)
-3-
A
Supply current from V
DD
at
V
DD
= 3.0 V
Buffer OFF
(BUFEN=0 is LCD_CR register)
-1.5-
I
VLCD
Supply current from V
LCD
(V
LCD
= 3 V)
Buffer OFF
(BUFFEN = 0, PON = 0)
-0.5-
A
Buffer ON
(BUFFEN = 1, 1/2 Bias)
-0.6-
Buffer ON
(BUFFEN = 1, 1/3 Bias)
-0.8-
Buffer ON
(BUFFEN = 1, 1/4 Bias)
-1-
R
HN
Total High Resistor value for Low drive resistive network - 5.5 - M
R
LN
Total Low Resistor value for High drive resistive network - 240 - k
V
44
Segment/Common highest level voltage - V
LCD
-
V
V
34
Segment/Common 3/4 level voltage - 3/4 V
LCD
-
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 -
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