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STR720 Datenblatt(PDF) 387 Page - STMicroelectronics

Teilenummer STR720
Bauteilbeschribung  ARM720T 16/32-BIT MCU WITH 16K RAM, USB, CAN, 3 TIMERS, ADC, 6 COMMUNICATIONS INTERFACES
PDF  401 Pages
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Hersteller  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
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STR720 Datenblatt(HTML) 387 Page - STMicroelectronics

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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
RS
Series resistor
Accuracy:
±5%
25.65
27
28.35
Ω
Rpu
Line pull-up resistor
Accuracy:
±5%
1.425
1.500
1.575
k
Ω
VTERM
Line termination voltage
3.0
3.3
3.6
V
VIHU
USB clock signal input high
level
Same as P2.10 GPIO
2
-
-
V
VILU
USB clock signal input low
level
Same as P2.10 GPIO
-
-
0.8
V
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
V
VIH
Single-ended receiver
high level input voltage
2.0
-
-
V
VHYST
Single-ended receiver
hysteresis
-
400
0
mV
VDI
Differential input sensitivity
|USBDP - USBDM|
200
-
-
mV
VCM
Differential common mode
range(2)
Includes VDI range
0.8
-
2.5
V
STR720
USBDP (P2.15)
USBCLK (P2.10)
RS
RS
USBDM (P2.14)
Rpu
VTERM
D +
D -
USB CLOCK
SOURCE
fCKU



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