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参数资料
| 型号： | MAX3421EETJ+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 17/28页 |
| 文件大小： | 0K |
| 描述： | IC USB PERIPH/HOST CNTRL 32TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 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： | 32-WFQFN 裸露焊盘 |
| 供应商设备封装： | 32-TQFN-EP（5x5） |
| 包装： | 托盘 |
| 产品目录页面： | 1407 (CN2011-ZH PDF) |
| 配用： | MAX3421EVKIT-1+-ND - EVAL KIT FOR MAX3421E |
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MAX3421E
USB Peripheral/Host Controller
with SPI Interface
24
Maxim Integrated
CLOAD: 18pF (max)
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 MAX3421E 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.
MAX3421E in a Bus-Powered Peripheral
Application
Figure 19 depicts the MAX3421E in a peripheral device
that is powered by VBUS. This configuration is advanta-
geous because it requires no external power supply.
VBUS is specified from 4.75V to 5.25V, requiring a 3.3V
regulator to power the MAX3421E. This diagram
assumes that the microprocessor is powered by 3.3V
as well, so the VL pin (logic-level reference voltage) is
connected to VCC. Therefore, the GPIOs (general-pur-
pose inputs/outputs) are referenced to 3.3V.
USB is a hot-plug system (VBUS is powered when the
device is plugged in), so it is good design practice to
use a power-on reset circuit to provide a clean reset to
the system when the device is plugged in. The
MAX6349TL serves as an excellent USB regulator,
since it has very low quiescent current and a POR cir-
cuit built in.
Because this design is bus powered, it is not necessary
to test for the presence of VBUS. In this case, the bus
voltage-detection input, VBCOMP, makes an excellent
general-purpose input. The VBCOMP input has two inter-
rupts associated with it, VBUSIRQ and NOVBUSIRQ.
These interrupts can detect both edges of any transitions
on the VBCOMP input.
The configuration in Figure 19 shows the SPI interface
using the maximum number of SPI interface pins. The
data pins, MOSI and MISO, are separate, and the
MAX3421E supplies an interrupt signal through the INT
output pin to the P to notify the P when its attention
is required.
MAX3421E
VCC
VL
XI
XO
INT
MOSI
MISO
SCLK
RES
D+
D-
D+
D-
VBCOMP
SS
0.1
μF
GND
VBUS
33
Ω
33
Ω
1.0
μF
CERAMIC
CXI
CXO
12MHz
3.3V
REGULATOR
MAX6349TL
μP
8
USB "B"
CONNECTOR
GND
GPIN GPOUT
4.7
μF
GPIO
GPI
Figure 19. MAX3421E in a Bus-Powered Peripheral Application
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX3421EETJ+ | 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 |
| MAX3421EETJ+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 |
| MAX3421EVKIT-1+ | 功能描述:界面开发工具 MAX3421E/20E 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 |
| MAX3430CPA | 功能描述:RS-485接口IC RoHS:否 制造商:Texas Instruments 数据速率:250 Kbps 工作电源电压:3.3 V 电源电流:750 uA 工作温度范围:- 40 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| MAX3430CPA+ | 功能描述:RS-485接口IC Fail-Safe 1/4-Unit 3.3V Transceiver RoHS:否 制造商:Texas Instruments 数据速率:250 Kbps 工作电源电压:3.3 V 电源电流:750 uA 工作温度范围:- 40 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
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