Electrical characteristics
STM32F103xC, STM32F103xD, STM32F103xE
Table 55. USB DC electrical characteristics
Symbol
Parameter
Conditions
Min.(1)
Max.(1) Unit
Input levels
VUSB
USB voltage(2)
Within VDD voltage range
I(USBDP, USBDM)
3.0(3)
0.2
3.6
V
V
(4)
VDI
Differential input sensitivity
(4)
VCM
Differential common mode range Includes VDI range
Single ended receiver threshold
0.8
2.5
2.0
(4)
VSE
1.3
Output levels
VOL
VOH
Static output level low
Static output level high
RL of 1.5 kΩto 3.6 V(5)
0.3
3.6
V
(5)
RL of 15 kΩto VSS
2.8
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 VDD voltage range.
4. Guaranteed by characterization, not tested in production.
RL is the load connected on the USB drivers
5.
Figure 50. USB timings: definition of data signal rise and fall time
Crossover
points
Differential
Data Lines
V
CR S
V
SS
t
t
r
f
ai14137
Table 56.
Symbol
USB: full-speed electrical characteristics
Driver characteristics(1)
Parameter
Conditions
Min
Max
Unit
tr
tf
Rise time(2)
Fall Time(2)
CL = 50 pF
CL = 50 pF
tr/tf
4
4
20
20
ns
ns
%
V
trfm
VCRS
Rise/ fall time matching
90
1.3
110
2.0
Output signal crossover voltage
1. Guaranteed by characterization, not tested in production.
Measured from 10% to 90% of the data signal. For more detailed informations, please refer to USB
Specification - Chapter 7 (version 2.0).
2.
5.3.17
CAN (controller area network) interface
Refer to Section 5.3.13: I/O port characteristics for more details on the input/output alternate
function characteristics (CANTX and CANRX).
98/118
STMICROELECTRONICS [ ST ]
