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参数资料
| 型号： | MAX3420EETG+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/22页 |
| 文件大小： | 0K |
| 描述： | IC USB PERIPH CONTROLLER 24TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 75 |
| 控制器类型： | USB 外设控制器 |
| 接口： | USB/串行 |
| 电源电压： | 3 V ~ 3.6 V |
| 电流 - 电源： | 15mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 供应商设备封装： | 24-TQFN-EP（4x4） |
| 包装： | 管件 |
| 产品目录页面： | 1407 (CN2011-ZH PDF) |
| 配用： | MAX3420EEVKIT-2+-ND - EVAL KIT FOR MAX3420E |
The VBUS detect input, VBCOMP, is an important
MAX3420E feature. Because the P is powered
whether the USB device is plugged in or not, it needs
some way to detect a plug-in event. A comparator
inside the MAX3420E checks for a valid VBUS connec-
tion on VBCOMP and provides a connect status bit to
the P. Once connected, the P can delay the logical
connection to the USB bus to perform any required ini-
tialization, and then connect by setting the CONNECT
bit to 1 in the MAX3420E register USBCTL (R15). This
connects the internal 1.5k
Ω resistor from D+ to VCC, to
signal the host that a device has been plugged in.
If a host turns off VBUS while the device is connected,
the USB rev. 2.0 specification requires that the device
must not power its 1.5k
Ω pullup resistor connected to
D+. The MAX3420E has two features to help service
this event. First, the NOVBUSIRQ bit indicates the loss
of VBUS. Second, the P can set a bit called VBGATE
(VBUS gate) to instruct the MAX3420E to disconnect the
pullup resistor anytime VBUS goes away, regardless of
the CONNECT bit setting.
Crystal Selection
The MAX3420E requires a crystal with the following
specifications:
Frequency: 12MHz
±0.25%
CLOAD: 18pF
CO: 7pF max
Drive level: 200W
Series resonance resistance: 60
Ω max
Note: Series resonance resistance is the resistance
observed when the resonator is in the series resonant
condition. This is a parameter often stated by quartz crys-
tal vendors and is called R1. When a resonator is used in
the parallel resonant mode with an external load capaci-
tance, as is the case with the MAX3420E oscillator circuit,
the effective resistance is sometimes stated. This effec-
tive resistance at the loaded frequency of oscillation is:
R1 x ( 1 + (CO / CLOAD))2
For typical CO and CLOAD values, the effective resis-
tance can be greater than R1 by a factor of 2.
USB Peripheral Controller
with SPI Interface
MAX3420E
VCC
VL
XI
XO
N.C.
INT
MOSI
GPX
MISO
SCLK
RES
D+
D-
D+
D-
VBCOMP
SS
0.1
μF
GND
GPIN
GPIO
GPOUT
VBUS
33
Ω
33
Ω
1.0
μF
CERAMIC
1.0
μF
CERAMIC
CXI
CXO
12MHz
μP
4
USB
"B" CONNECTOR
+3.3V
Figure 17. MAX3420E in a Self-Powered Application
MAX3420E
20
Maxim Integrated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX3420EETG+ | 功能描述:外围驱动器与原件 - PCI USB Peripheral Controller w/SPI RoHS:否 制造商:PLX Technology 工作电源电压: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:FCBGA-1156 封装:Tray |
| MAX3420EETG+T | 功能描述:外围驱动器与原件 - PCI USB Peripheral Controller w/SPI RoHS:否 制造商:PLX Technology 工作电源电压: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:FCBGA-1156 封装:Tray |
| MAX3420EETG-T | 功能描述:外围驱动器与原件 - PCI RoHS:否 制造商:PLX Technology 工作电源电压: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:FCBGA-1156 封装:Tray |
| MAX3420EEVKIT | 制造商:Maxim Integrated Products 功能描述:MAX3420E EVAL KIT - Bulk |
| MAX3420EEVKIT-2+ | 功能描述:界面开发工具 MAX3420E Eval Kit RoHS:否 制造商:Bourns 产品:Evaluation Boards 类型:RS-485 工具用于评估:ADM3485E 接口类型:RS-485 工作电源电压:3.3 V |
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