CD00161566 Datasheet, PDF (75/105 Pages) STMicroelectronics – nullMedium-density performance line ARM-based 32-bit MCU

STM32F103x8, STM32F103xB
Electrical characteristics
5.3.17
Symbol
Table 44. USB DC electrical characteristics
Parameter
Conditions
Min.⁽¹⁾
Max.⁽¹⁾ Unit
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
3.0⁽³⁾
0.2
0.8
1.3
3.6
V
-
2.5
V
2.0
Output levels
V_OL Static output level low
V_OH 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 36. USB timings: definition of data signal rise and fall time
Differen tial
data lines
VCR _S
Crossover
points
V_{S S}
tf
tr
ai14137
Symbol
Table 45. USB: Full-speed electrical characteristics⁽¹⁾
Parameter
Conditions
Min
Max
Unit
Driver characteristics
t_r
Rise time⁽²⁾
t_f
Fall time⁽²⁾
C_L = 50 pF
4
C_L = 50 pF
4
20
ns
20
ns
t_rfm
Rise/ fall time matching
t_r/t_f
90
110
%
V_CRS Output signal crossover voltage
1.3
2.0
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).
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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