Datasheet
Electrical characteristics STM32L433xx
192/224 DocID028794 Rev 4
Figure 41. SD default mode
USB characteristics
The STM32L433xx USB interface is fully compliant with the USB specification version 2.0
and is USB-IF certified (for Full-speed device operation).
CAN (controller area network) interface
Refer to Section 6.3.14: I/O port characteristics for more details on the input/output alternate
function characteristics (CAN_TX and CAN_RX).
SWPMI characteristics
The Single Wire Protocol Master Interface (SWPMI) and the associated SWPMI_IO
transceiver are compliant with the ETSI TS 102 613 technical specification.
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Table 100. USB electrical characteristics
(1)
Symbol Parameter Conditions Min Typ Max Unit
V
DDUSB
USB transceiver operating voltage 3.0
(2)
-3.6V
T
crystal_less
USB crystal less operation temperature -15 - 85 °C
R
PUI
Embedded USB_DP pull-up value during idle 900 1250 1600
R
PUR
Embedded USB_DP pull-up value during
reception
1400 2300 3200
Z
DRV
(3)
Output driver impedance
(4)
Driving high
and low
28 36 44
1. T
A
= -40 to 125 °C unless otherwise specified.
2. The STM32L433xx 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 voltage range.
3. Guaranteed by design.
4. No external termination series resistors are required on USB_DP (D+) and USB_DM (D-); the matching
impedance is already included in the embedded driver.
Table 101. SWPMI electrical characteristics
Symbol Parameter Conditions Min Typ Max Unit
t
SWPSTART
SWPMI regulator startup time
SWP Class B
2.7 V V
DD
3,3V
- - 300 s
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