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參數(shù)資料
| 型號(hào)： | MAX3421EEHJ+ |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 22/28頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC USB PERIPH/HOST CNTRL 32TQFP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 360 |
| 控制器類型： | USB 外設(shè)控制器 |
| 接口： | USB/串行 |
| 電源電壓： | 3 V ~ 3.6 V |
| 電流 - 電源： | 15mA |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 32-TQFP |
| 供應(yīng)商設(shè)備封裝： | 32-TQFP（5x5） |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁(yè)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
3
Maxim Integrated
3.3V
REGULATOR
POWER RAIL
ASIC,
DSP,
ETC.
SPI
3, 4
INT
MAX3421E
USB
Figure 2. The MAX3421E Connected to a Large Chip
3.3V
REGULATOR
MISO
LOCAL
GND
LOCAL
POWER
INT
MAX3421E
SCLK
MOSI
SS
MICRO
ASIC
DSP
I
S
O
L
A
T
O
R
S
USB
Figure 3. Optical Isolation of USB Using the MAX3421E
MICRO,
ASIC,
DSP
USB
PERIPHERAL
USB
"A"
USB
"B"
VBUS
SWITCH
FAULT
5V
SPI
3, 4
INT
VBUS
D+
D-
GND
VBUS
POWER
ON/OFF
3.3V
REGULATOR
MAX3421E
Figure 4. The MAX3421E in an Embedded Host Application
Two MAX3421E features make it easy to connect to
large, fast chips such as ASICs and DSPs (Figure 2).
First, the SPI interface can be clocked up to 26MHz.
Second, the VL pin and internal level translators allow
running the system interface at a lower voltage than
the 3.3V required for VCC.
The MAX3421E provides an ideal method for electrically
isolating a USB interface (Figure 3). USB employs flow
control in which the MAX3421E automatically answers
host requests with a NAK handshake, until the micro-
processor completes its data-transfer operations over
the SPI port. This means that the SPI interface can run
at any frequency up to 26MHz. Therefore, the designer
is free to choose the interface operating frequency and
to make opto-isolator choices optimized for cost or per-
formance.
Figure 4 shows a block diagram for a system in which
the MAX3421E operates as a USB host. A USB host
supplies 5V power to the VBUS pin of the USB “A” con-
nector to power USB peripherals. A system that pro-
vides power to an external peripheral should use
protection circuitry on the power pin to prevent an
external overcurrent situation from damaging the sys-
tem. A VBUS switch, such as the MAX4789, provides
power control plus two additional features: it limits the
current delivered to the peripheral (for example to
200mA), and it indicates a fault (overcurrent) condition
to the SPI controller. Maxim offers a variety of VBUS
switches with various current limits and features.
Consult the Maxim website for details.
A 3.3V regulator (for example, the MAX6349TL) powers
the MAX3421E, and optionally the system controller. If
the system controller operates with a lower voltage, the
MAX3421E SPI and I/O interface can run at the lower
voltage by connecting the system voltage (for exam-
ple, 2.5V or 1.8V) to the MAX3421E VL pin.
Typical Application Circuits (continued)
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|---|---|
| MAX3421EEHJ+ | 功能描述:外圍驅(qū)動(dòng)器與原件 - PCI USB Peripheral Controller w/SPI RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray |
| MAX3421EEHJ+T | 功能描述:外圍驅(qū)動(dòng)器與原件 - PCI USB Peripheral Controller w/SPI RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray |
| MAX3421EEHJ+TG2C | 制造商:Maxim Integrated Products 功能描述:USB PERIPHERAL/HOST CONTROLLER WITH SPI INTERFACE SPECIAL TA - Tape and Reel 制造商:Maxim Integrated Products 功能描述:USB PERIPHERAL/HOST CONTROLLER WITH SPI INTERFACE - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC USB PERIPH/HOST CNTRL TQFP 制造商:Maxim Integrated Products 功能描述:Peripheral Drivers & Components - PCIs USB Peripheral/Host Cntlr w/ SPI IF |
| MAX3421EETJ+ | 功能描述:外圍驅(qū)動(dòng)器與原件 - PCI USB Peripheral Controller w/SPI RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray |
| MAX3421EETJ+T | 功能描述:外圍驅(qū)動(dòng)器與原件 - PCI USB Peripheral Controller w/SPI RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray |
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