Table 50. Usb Startup Time; Table 51. Usb Dc Electrical Characteristics; Table 52. Usb: Full Speed Electrical Characteristics; Figure 24. Usb Timings: Definition Of Data Signal Rise And Fall Time - ST STM32L15 QC Series Datasheet

STM32L151xC/C-A STM32L152xC/C-A
USB characteristics
The USB interface is USB-IF certified (full speed).
Symbol
t
STARTUP
1. Guaranteed by design.
Symbol
Input levels
V
DD
(2)
V
DI
(2)
V
CM
(2)
V
SE
Output levels
(3)
V
OL
(3)
V
OH
1. All the voltages are measured from the local ground potential.
2. Guaranteed by characterization results.
3. Guaranteed by test in production.
4. R is the load connected on the USB drivers.
L
Differential
data lines
V
CRS
V
SS
Symbol
t
r
t
f
t
rfm
V
CRS
(1)
USB transceiver startup time

Table 51. USB DC electrical characteristics

Parameter
USB operating voltage
Differential input sensitivity
Differential common mode range Includes V
Single ended receiver threshold
Static output level low
Static output level high

Figure 24. USB timings: definition of data signal rise and fall time

Cross over
points
t
f

Table 52. USB: full speed electrical characteristics

Parameter
(2)
Rise time
(2)
Fall Time
Rise/ fall time matching
Output signal crossover voltage

Table 50. USB startup time

Parameter
Conditions
I(USB_DP, USB_DM)
DI
R of 1.5 kΩ to 3.6 V
L
R of 15 kΩ to V
L
t
r
Driver characteristics
Conditions
C = 50 pF
L
C = 50 pF
L
t /t
r f
-
DS10262 Rev 8
Electrical characteristics
Max
1
(1)
Min.
- 3.0
0.2
range 0.8
- 1.3
(4)
-
(4)
2.8
SS
(1)
Min Max
4 20
4 20
90 110
1.3 2.0
Unit
µs
(1)
Max. Unit
3.6 V
-
2.5 V
2.0
0.3
V
3.6
ai14137b
Unit
ns
ns
%
V
99/134
113