Electrical characteristics
Table 55.
Symbol
Input levels
V
USB
V
DI(4)
V
CM(4)
V
SE(4)
USB voltage
(2)
Differential input sensitivity
STM32F103xC, STM32F103xD, STM32F103xE
USB DC electrical characteristics
Parameter
Conditions
Min.
(1)
Max.
Unit
Within V
DD
voltage range
I(USBDP, USBDM)
3.0
(3)
0.2
0.8
1.3
3.6
V
Differential common mode range Includes V
DI
range
Single ended receiver threshold
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
Ω
to 3.6 V
(5)
R
L
of 15 k
Ω
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 kΩ 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 characterization, not tested in production.
5. R
L
is the load connected on the USB drivers
Figure 50. USB timings: definition of data signal rise and fall time
Crossover
points
Differen tial
Data L ines
V
CRS
VS S
tf
tr
ai14137
Table 56.
USB: full-speed electrical characteristics
Driver characteristics
(1)
Symbol
t
r
t
f
t
rfm
V
CRS
Parameter
Rise time
(2)
Fall Time
Rise/ fall time matching
Output signal crossover voltage
Conditions
C
L
= 50 pF
C
L
= 50 pF
t
r
/t
f
Min
4
4
90
1.3
Max
20
20
110
2.0
Unit
ns
ns
%
V
1. Guaranteed by characterization, 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).
5.3.17
CAN (controller area network) interface
Refer to
for more details on the input/output alternate
function characteristics (CANTX and CANRX).
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