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參數(shù)資料
| 型號： | CP2104EK |
| 廠商： | Silicon Laboratories Inc |
| 文件頁數(shù)： | 10/22頁 |
| 文件大?。?/td> | 0K |
| 描述： | KIT EVAL FOR CP2104 |
| 產(chǎn)品培訓(xùn)模塊： | CP21xx USB Bridge |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 主要目的： | 接口，USB 2.0 至 UART（RS485）電橋 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | CP2104 |
| 主要屬性： | 全速（12Mbps） |
| 次要屬性： | LED 狀態(tài)指示器 |
| 已供物品： | 板，線纜，CD |
| 相關(guān)產(chǎn)品： | 336-2008-5-ND - IC SGL USB-TO-UART BRIDGE 24QFN |
| 其它名稱： | 336-2007 |
CP2104
18
Rev. 1.1
Alternatively, if 3.0 to 3.6 V power is supplied to the VDD pin, the CP2104 can function as a USB self-powered
device with the voltage regulator bypassed. For this configuration, tie the REGIN input to VDD to bypass the voltage
regulator. A typical connection diagram showing the device in a self-powered application with the regulator
bypassed is shown in Figure 9.
The USB max power and power attributes descriptor must match the device power usage and configuration. See
application note “AN721: CP210x/CP211x Device Customization Guide” for information on how to customize USB
descriptors for the CP2104.
Figure 9. Typical Self-Powered Connection Diagram (Regulator Bypass)
Note 1
VBUS
D+
D-
GND
USB
Connector
To external circuitry for
USB suspend states
Standard
UART
Signals
CP2104
RI
DCD
GPIO.2
GPIO.3
GPIO.0
GPIO.1
SUSPEND
DTR
DSR
RTS
CTS
TXD
RXD
REGIN
VDD
GND
VIO
VBUS
D+
D-
RST
0.1
F
VIO
4.7 k
Note 1 : Avalanche transient voltage suppression diodes compatible with Full-speed USB should be
added at the connector for ESD protection. Use Littelfuse p/n SP0503BAHT or equivalent.
Note 2 : An external pull-up is not required, but can be added for noise immunity.
Note 3 : VIO can be connected directly to VDD or to a supply as low as 1.8 V to set the I/O interface
voltage.
Note 4 : If configuration ROM is to be programmed via USB, a 4.7
F capacitor must be added
between VPP and ground. During a programming operation, the pin should not be
connected to other circuitry, and VDD must be at least 3.3 V.
Note 5 : For self-powered systems where VDD and VIO may be unpowered when VBUS is connected
to 5 V, a resistor divider (or functionally-equivalent circuit) on VBUS is required to meet the
absolute maximum voltage on VBUS specification in the Electrical Characteristics section.
VPP
4.7
F
Note 4
To external circuitry for
status and control
1-5
F
3.3 V
Power
Note 2
Note 3
47 k
24 k
Note 5
(Optional)
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