STM32F405 datasheet(129/204 Pages) STMICROELECTRONICS

129 / 204 page

DS8626 Rev 9

129/203

STM32F405xx, STM32F407xx

Electrical characteristics

Figure 44. USB OTG FS timings: definition of data signal rise and fall time

USB HS characteristics

Unless otherwise specified, the parameters given in Table 62 for ULPI are derived from

tests performed under the ambient temperature, fHCLK frequency summarized in Table 61

and VDD supply voltage conditions summarized in Table 60, with the following configuration:

•

Output speed is set to OSPEEDRy[1:0] = 10

•

Capacitive load C = 30 pF

•

Measurement points are done at CMOS levels: 0.5VDD.

Refer to Section Section 5.3.16: I/O port characteristics for more details on the input/output

characteristics.

Table 59. USB OTG FS electrical characteristics(1)

1. Guaranteed by design.

Driver characteristics

Symbol

Parameter

Conditions

Min

Max

Unit

Rise time(2)

2. Measured from 10% to 90% of the data signal. For more detailed informations, please refer to USB

Specification - Chapter 7 (version 2.0).

CL = 50 pF

420

Fall time(2)

CL = 50 pF

trfm

Rise/ fall time matching

tr/tf

110

VCRS

Output signal crossover voltage

1.3

2.0

Table 60. USB HS DC electrical characteristics

Symbol

Parameter

Min.(1)

1. All the voltages are measured from the local ground potential.

Max.(1)

Unit

Input level

VDD

USB OTG HS operating voltage

2.7

3.6

Table 61. USB HS clock timing parameters(1)

Parameter

Symbol

Min

Nominal

Max

Unit

fHCLK value to guarantee proper operation of

USB HS interface

-30

MHz

Frequency (first transition)

8-bit ±10%

FSTART_8BIT

MHz

ai14137b

Cross over

points

Differential

data lines

VCRS

VSS

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