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参数资料
| 型号： | MAX3421EETJ+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 18/28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
25
Maxim Integrated
MAX3421E in a Self-Powered Application
Figure 20 shows a self-powered peripheral design in
which the P has its own power source. This is a com-
mon configuration in battery-powered handheld
devices. Figure 20 also illustrates the SPI interfacing
with the minimum number of pins. This is achieved by
using a single bidirectional data line and no interrupt
pin connection. The MAX3421E register bit, FDUPSPI,
configures the SPI interface for bidirectional operation.
Although Figure 20 shows VL = VCC, if the microcon-
troller uses a different interface voltage (1.71V to 3.6V),
this reference voltage can be connected to VL. The
Figure 20 circuit shows a connection from the MAX3421E
GPX output to the microcontroller. GPX can be pro-
grammed (see Table 5) to connect the output of the inter-
nal VBUS comparator to the GPX output. This enables the
microprocessor to detect a USB plug-in event even if the
MAX3421E is put into its power-down state.
The VBUS detect input, VBCOMP, is an important
MAX3421E 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 MAX3421E 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 MAX3421E register USBCTL (R15). This
connects the internal 1.5k
Ω resistor from D+ to 3.3V, 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 MAX3421E 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 MAX3421E to disconnect the
pullup resistor anytime VBUS goes away, regardless of
the CONNECT bit setting.
MAX3421E in a Host Application
Figure 21 illustrates the MAX3421E operating as an
embedded host. A host supplies VBUS power to a
peripheral; therefore, this circuit requires an external 5V
supply. A circuit that provides power to external
devices should include power protection (the
MAX4793, for example, which limits current from
300mA to 400mA) to ensure that the circuit can contin-
ue to operate if the plugged-in device causes an over-
current condition. The FLAG indicator of the overcurrent
switch connects to one of the eight MAX3421E GPIN
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
1.0
μF
CERAMIC
CXI
CXO
12MHz
μP
8
USB "B"
CONNECTOR
GND
GPIN GPOUT
GPIO
GPX
N.C.
+3.3V
Figure 20. MAX3421E in a Self-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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