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参数资料
| 型号： | MAX14502AETL+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 25/41页 |
| 文件大小： | 0K |
| 描述： | IC CARD READER USB-SD 40-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | USB |
| 接口： | I²C，2 线串口 |
| 电源电压： | 1.8 V ~ 3.3 V |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 供应商设备封装： | 40-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
| 安装类型： | 表面贴装 |
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MAX14500–MAX14503
Hi-Speed USB-to-SD Card
Readers with Bypass
______________________________________________________________________________________
31
SD Port Switches
The SD port analog switches change states immediately
whether the MAX14500–MAX14503 are in Sleep mode
(WAKEUP = 0) or awake. If the internal USB Hi-Speed
SD card reader is in operation, the SD card switches for
the selected path are opened automatically. Any writes
to the SD port switch bits for that path are ignored. The
SD port analog switches for the path not being used for
the card reader are controllable by the host P, and any
writes to these bits affect state changes immediately.
Card Detection
The MAX14500–MAX14503 provide an analog switch to
pass the card present signal on SD card slot 1. This
allows the host P to continue using the SD slot card
present switch (see Figure 21). The internal analog
switch can be bypassed if an alternate algorithm is
used to detect card data change. The second SD card
path does not provide this analog switch so if this path
is used for another SD card socket, an alternate card-
detection mechanism for the host P may be needed. If
the second SD card path is used for an SD interface
NAND chip, no card detection is required.
The MAX14500–MAX14503 do not use the SD card slot
switch to detect insertion and removals. Instead, a pro-
tocol-based detection mechanism is used that polls for
the presence or absence of an SD card. This allows
both path 1 and path 2 to support an SD card slot with
removable SD cards without a connection between
the MAX14500–MAX14503 and the SD socket card pre-
sent switch. The pullup voltage for the card slot detec-
tion may be any voltage equal to or less than VSD.
Enumeration
The MAX14500–MAX14503 enumerate to the USB
mass storage class and appear as a USB mass stor-
age device on most operating systems.
USB Hi-Speed vs. Full-Speed
The MAX14500–MAX14503 support USB Hi-Speed and
full-speed operation. The MAX14500–MAX14503 operate
at 480Mbps when plugged into a Hi-Speed USB host,
and at 12Mbps when plugged into a full-speed host.
USB VID/PID
Using I2C, the MAX14500–MAX14503 have dedicated
I2C registers for vendor identification (VID) and product
identification (PID). The programmed 16-bit default val-
ues are shown in the
Register Map section. The factory
default values can be replaced with your company’s VID
and PID.
CCRD_PRST
MECHANICAL CARD
DETECT SWITCH
MAX14500–MAX14503 SD
PORT1 SWITCH
CCMD1
CCLK1
HCRD_PRST
≤ VSD
HCMD1
HCLK1
CDAT1_[3:0]
HDAT1_[3:0]
HOST SD PORT
CARD PRESENT INPUT
SD CARD
≤ VSD
MECHANICAL CARD
DETECT SWITCH
MAX14500–MAX14503 SD
PORT2 SWITCH
CCMD2
CCLK2
HCMD2
HCLK2
CDAT2_[3:0]
HDAT2_[3:0]
HOST SD PORT
CARD PRESENT INPUT
SD CARD
Figure 21. Host Card Detection Schemes
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX14502EVKIT+ | 功能描述:界面开发工具 MAX14502 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 |
| MAX14503AEWN+ | 制造商:Maxim Integrated Products 功能描述: |
| MAX14503ETL+ | 制造商:Maxim Integrated Products 功能描述: |
| MAX14504EWC+T | 功能描述:模拟开关 IC Dual SPDT Neg Rail w/ +/-VCC Cap RoHS:否 制造商:Texas Instruments 开关数量:2 开关配置:SPDT 开启电阻（最大值）:0.1 Ohms 切换电压（最大）: 开启时间（最大值）: 关闭时间（最大值）: 工作电源电压:2.7 V to 4.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:DSBGA-16 |
| MAX14505AEWC+ | 制造商:Maxim Integrated Products 功能描述:DUAL SPDT NEGATIVE RAIL ANALOG SWIT - Rail/Tube |
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