Electrical characteristics
STM32F103x8, STM32F103xB
Table 44. USB DC electrical characteristics
Symbol
Parameter
Conditions
Min.(1)
Max.(1) Unit
Input levels
VDD
USB operating voltage(2)
3.0(3)
0.2
3.6
V
V
(4)
VDI
Differential input sensitivity
Differential common mode range
Single ended receiver threshold
I(USBDP, USBDM)
Includes VDI range
(4)
VCM
0.8
2.5
2.0
(4)
VSE
Output levels
1.3
VOL
VOH
Static output level low
Static output level high
RL of 1.5 kΩ to 3.6 V(5)
0.3
3.6
V
(5)
RL of 15 kΩ to 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 design, not tested in production.
RL is the load connected on the USB drivers
5.
Figure 36. 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 45.
Symbol
USB: Full-speed electrical characteristics(1)
Parameter
Conditions
Min
Max
Unit
Driver characteristics
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 design, 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 5.3.12: I/O current injection characteristics for more details on the
input/output alternate function characteristics (CAN_TX and CAN_RX).
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Doc ID 13587 Rev 14
STMICROELECTRONICS [ ST ]
