STR720 datasheet(387/401 Pages) STMICROELECTRONICS

387 / 401 page

STR720 - ELECTRICAL CHARACTERISTICS

387/401

28.10 USB - Universal Bus Interface

In order to implement a correct USB interface, a few external components are required to be

compliant to the protocol electrical characteristics. A possible application scheme is depicted

in Figure 77 and detailed in Table 102.

Hereafter the electrical characteristics of STR720 USB interface are reported. These values

are measured with a specific setup following USB standard recommendations and summed

up in the “Test Condition” column of the table, where RS is the series resistor value and CL the

capacitive load to GND connected to each USB pad.

Figure 77. USB typical application

Table 102. USB typical application recommendations

Symbol

Parameter

Conditions

Value

Unit

Min

Typ

Max

Series resistor

Accuracy:

±5%

25.65

28.35

Ω

Rpu

Line pull-up resistor

Accuracy:

±5%

1.425

1.500

1.575

Ω

VTERM

Line termination voltage

3.0

3.3

3.6

VIHU

USB clock signal input high

level

Same as P2.10 GPIO

VILU

USB clock signal input low

level

Same as P2.10 GPIO

0.8

fCKU

USB clock signal frequency

Accuracy:

± 0.25%

47.88

48.00

48.12

MHz

Table 103. USB DC Characteristics

Symbol

Parameter

Test Conditions(1)

Value

Unit

Min

Typ

Max

VIL

Single-ended receiver

low level input voltage

0.8

VIH

Single-ended receiver

high level input voltage

2.0

VHYST

Single-ended receiver

hysteresis

400

VDI

Differential input sensitivity

|USBDP - USBDM|

200

VCM

Differential common mode

range(2)

Includes VDI range

0.8

2.5

STR720

USBDP (P2.15)

USBCLK (P2.10)

USBDM (P2.14)

Rpu

VTERM

D +

D -

USB CLOCK

SOURCE

fCKU

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