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参数资料
| 型号： | EVAL-ADUSB2EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 7/16页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL USB TO SPI/12C |
| 标准包装： | 1 |
| 系列： | SigmaDSP® |
| 附件类型： | 接口板 |
| 适用于相关产品： | SigmaStudio? |
Application Note
CIRCUIT SCHEMATICS
USB CONNECTOR
The connection between the host PC and the Cypress USB
interface device is via a standard USB cable that carries D+ and
D? signals for data communications, a 5 V power supply, and
ground. The D+ and D? lines are a one-wire communication
interface carried by half-duplex differential signals on a twisted
pair. The clock is embedded in the data using the nonreturn-to-
zero inverted (NRZI) line code. These signal lines connect
directly to pins on the Cypress USB interface.
A surface-mounted USB miniature Type B jack was selected for
its low profile and increasing ubiquity in consumer electronics.
5V0DD
VCC 1
AN-1006
POWER REGULATOR
The Cypress USB Interface I/O ports are capable of operating in
both 1.8 V and 3.3 V modes, depending on the target device in
the system. Two regulators, one for 5 V to 3.3 V regulation and
the other for 5 V to 1.8 V regulation, run simultaneously when
the board is powered. A switch (S1) is provided to easily switch
the IOVDD supply between the two regulators. LED D4 provides
visual feedback that the board is being supplied with 5 V power
from the PC USB port.
The position of switch S1 should not be changed when the
board is connected to the USB bus.
J3
USB-MINI-B-SMD
D– 2
D+ 3
DMINUS
DPLUS
GND 4
Figure 18. USB Connector Schematic
5V0DD
3V3DD
ADP1711AUJZ-3.3-R7
1 IN
3 EN
OUT 5
BYP 4
C21
1.0uF
GND
2
U8
C18
C19
1.0uF
+
C14
10uF
Red Diffused
10nF
1V8DD
1V8DD
3V3DD
IOVDD
ADP1711AUJZ-1.8-R7
1 IN OUT 5
3
S1
2
R10
475R
+
C22
15uF
C20
1.0uF
3
EN
GND
2
BYP
U7
4
C16
10nF
C17
1.0uF
+
C13
10uF
TP1
1
SPDT
Figure 19. Power Regulator Schematic
Rev. A | Page 7 of 16
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