STM32F042F4 datasheet(89/117 Pages) STMICROELECTRONICS

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STM32F042x4 STM32F042x6

Electrical characteristics

USB characteristics

The STM32F042x4/x6 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).

Table 65. USB electrical characteristics

Symbol

Parameter

Conditions

Min.

Typ

Max.

Unit

VDDIO2

USB transceiver operating

voltage

-3.0(1)

1. The STM32F042x4/x6 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.

-3.6

tSTARTUP(2)

2. Guaranteed by design, not tested in production.

USB transceiver startup time

1.0

µs

RPUI

Embedded USB_DP pull-up

value during idle

1.1

1.26

1.5

kΩ

RPUR

Embedded USB_DP pull-up

value during reception

2.0

2.26

2.6

ZDRV(2)

Output driver impedance(3)

3. 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.

Driving high

and low

Ω

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