Datasheet

Electrical characteristics STM32L073xx
116/137 DocID027096 Rev 2
Figure 38. USB timings: definition of data signal rise and fall time
6.3.21 LCD controller
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
V
LCD
pin to decouple this converter.
Table 80. USB: full speed electrical characteristics
Driver characteristics
(1)
1. Guaranteed by design.
Symbol Parameter Conditions Min Max Unit
t
r
Rise time
(2)
2.
Measured from 10% to 90% of the data signal. For more detailed informations, please refer to USB
Specification - Chapter 7 (version 2.0).
C
L
= 50 pF 420ns
t
f
Fall Time
(2)
C
L
= 50 pF 4 20 ns
t
rfm
Rise/ fall time matching t
r
/t
f
90 110 %
V
CRS
Output signal crossover voltage 1.3 2.0 V
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Table 81. 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
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