參數(shù)資料
型號(hào)： MAX14502AETL+T
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 18/41頁(yè)
文件大小： 0K
描述： IC CARD READER USB-SD 40-TQFN
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 2,500
應(yīng)用： USB
接口： I²C，2 線串口
電源電壓： 1.8 V ~ 3.3 V
封裝/外殼： 40-WFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 40-TQFN-EP（5x5）
包裝： 帶卷 (TR)
安裝類型： 表面貼裝
MAX14500–MAX14503
Hi-Speed USB-to-SD Card
Readers with Bypass
______________________________________________________________________________________
25
Error Checking
In simple control, the BERR/INT output functions as
BERR and indicates if an error occurs during Card
Reader mode. If BERR asserts low to indicate an error,
the MAX14500–MAX14503 stay in Card Reader mode.
If the error clears, data transfer begins. BERR asserts if
KVBUS, VTM, or VSD are not present. It is recommend-
ed that MODE be pulled low when BERR indicates an
error to return the MAX14500–MAX14503 to Pass Thru
mode for the host P to clear the error.
In I2C control, BERR/INT functions as an interrupt out-
put (INT) and asserts for errors encountered in Card
Reader mode when interrupts are not masked. To find
the source of the interrupt, read the interrupt request
registers and status register.
Busy Indication (BSY)
The BUSY output is used in simple control and I2C con-
trol to indicate when Card Reader mode is active. In
simple control, transitioning MODE high to low requests
the internal microcontroller to enable Pass Thru mode.
BUSY asserts low while in Card Reader mode and
deasserts high in Pass Thru mode.
The BSY bit in STATUS1 (0x12) behaves similarly with
I2C control. The BUSY output is represented by the BSY
bit. Requests to put the device to sleep or bypass
(Pass Thru mode) while in Card Reader mode can be
verified by checking the state of the BUSY signal or
BSY bit. The BUSY output indicates the status of the
BUSY flag in STATUS1. The BSY bit is 1 when the
BUSY output asserts low. When enabled, changes in
the busy flag cause an interrupt. In I2C control, either
the BSY bit or the BUSY output give the status of the
busy state.
HCRD_PRST
HCLK1
HCMD1
HDAT1_[3:0]
CD+
HOST PROCESSOR
USB SWITCHES
CD-
D+
D-
HD+
HD-
USB
CONNECTOR
SD CARD INTERFACE
USB HS
CARD READER
CCRD_PRST
SD PORT 1 SWITCHES
CCLK1
CCMD1
BUSY
BERR
MODE = HIGH
4
CDAT1_[3:0]
I2C_SEL = LOW
SD
PORT1
I/O
LEVEL
TRANSLATORS
HOST
I/O
SD
SLOT 1
USB
TRANSCEIVER
MAX14500–
MAX14503
Figure 11. I2C_SEL is connected low to enable simple control and MODE = 1 to enable Card Reader mode for SD card 1.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX14502EVKIT+ 功能描述:界面開發(fā)工具 MAX14502 Eval Kit RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類型:RS-485 工具用于評(píng)估:ADM3485E 接口類型:RS-485 工作電源電壓: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:模擬開關(guān) IC Dual SPDT Neg Rail w/ +/-VCC Cap RoHS:否 制造商:Texas Instruments 開關(guān)數(shù)量:2 開關(guān)配置:SPDT 開啟電阻（最大值）:0.1 Ohms 切換電壓（最大）: 開啟時(shí)間（最大值）: 關(guān)閉時(shí)間（最大值）: 工作電源電壓:2.7 V to 4.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體: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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