STM32F103x8, STM32F103xB
Table 43.
Symbol
Input levels
V
DD
V
DI(4)
V
CM(4)
V
SE(4)
USB operating voltage
(2)
Differential input sensitivity
Differential common mode range
Single ended receiver threshold
I(USBDP, USBDM)
Includes V
DI
range
Electrical characteristics
USB DC electrical characteristics
Parameter
Conditions
Min.
(1)
Max.
(1)
Unit
3.0
(3)
0.2
0.8
1.3
3.6
V
2.5
2.0
V
Output levels
V
OL
V
OH
Static output level low
Static output level high
R
L
of 1.5 k
to 3.6 V
(5)
R
L
of 15 k
to V
SS(5)
2.8
0.3
V
3.6
1. All the voltages are measured from the local ground potential.
2. To be compliant with the USB 2.0 full-speed electrical specification, the USBDP (D+) pin should be pulled
up with a 1.5 k resistor to a 3.0-to-3.6 V voltage range.
3. The STM32F103xx USB functionality is ensured down to 2.7 V but not the full USB electrical
characteristics which are degraded in the 2.7-to-3.0 V V
DD
voltage range.
4. Guaranteed by design, not tested in production.
5. R
L
is the load connected on the USB drivers
Figure 30. USB timings: definition of data signal rise and fall time
Crossover
points
Differen tial
data lines
V
CRS
VS S
tf
tr
ai14137
Table 44.
Symbol
USB: Full-speed electrical characteristics
(1)
Parameter
Conditions
Min
Max
Unit
Driver characteristics
t
r
t
f
t
rfm
V
CRS
Rise time
(2)
Fall time
(2)
Rise/ fall time matching
Output signal crossover voltage
C
L
= 50 pF
C
L
= 50 pF
t
r
/t
f
4
4
90
1.3
20
20
110
2.0
ns
ns
%
V
1. Guaranteed by design, not tested in production.
2. Measured from 10% to 90% of the data signal. For more detailed informations, please refer to USB
Specification - Chapter 7 (version 2.0).
5.3.16
CAN (controller area network) interface
Refer to
for more details on the input/output alternate
function characteristics (CAN_TX and CAN_RX).
Doc ID 13587 Rev 11
67/92
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