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MAX14501AEWN+ Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX14501AEWN+ Datasheet(HTML) 9 Page - Maxim Integrated Products |
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9 / 41 page  Hi-Speed USB-to-SD Card Readers with Bypass _______________________________________________________________________________________ 9 Pin Description PIN TQFN WLP NAME FUNCTION INPUTS/OUTPUTS 1 C4 I2C_SEL I2C Select Input. I2C_SEL must be connected to VIO or GND at power-up. Drive I2C_SEL low to disable I2C control and drive I2C_SEL high to enable I2C control. 2 A2 SCL I2C Serial-Clock Input. SCL is +3.6V tolerant and the high threshold is set by VIO. If the I2C interface is not used, connect SCL to GND. 3 B4 SDA I2C Serial-Data I/O. SDA is +3.6V tolerant and the high threshold is set by VIO. If the I2C interface is not used, connect SDA to GND. 4 A3 ADD I2C Address Selection Input. Connect ADD to VIO or GND to select between two I2C slave addresses: (GND = 1110 000Xb and VIO = 1110 001Xb). 6B6 BERR/INT Card Reader Error/Interrupt Output. BERR/INT becomes BERR for simple control and INT for I2C control. BERR/INT goes low to indicate an error in Card Reader mode during simple control and asserts for enabled interrupts during I2C control. 7A7 BUSY Busy Output. BUSY asserts low to indicate device is in Card Reader mode. 8 C6 MODE Card Reader/Pass Thru Mode Select Input. MODE is only active during simple control. Drive MODE low to enable Pass Thru mode and drive MODE high to enable Card Reader mode. For I2C control, MODE must be connected to GND. 9B7 RST Reset Input. Drive RST low to reset the internal registers to default values and put all outputs in high impedance. Connect RST to VIO for normal operation. 25 E6 FREF Frequency Input. FREF is the clock input (12MHz/13MHz/19.2MHz/26MHz) for the internal logic and USB PHY. FREF can accept a square-wave or sine-wave clock. An internal clock squaring circuit can be enabled or disabled through I2C. In simple control, the internal clock squarer is enabled by default. 27 F5 RREF Reference Resistor. Connect a Bias Resistor 6.19k Ω ±1% from RREF to GND. USB INTERFACE 22 G7 CD+ USB Analog Switch/Hi-Speed USB Transceiver. CD+ connects to D+ on the USB connector. 21 F7 CD- USB Analog Switch/Hi-Speed USB Transceiver. CD- connects to D- on the USB connector. 20 G8 HD+ USB Analog Switch. HD+ connects to D+ on the host side. 19 F8 HD- USB Analog Switch. HD- connects to D- on the host side. 28 E5 KVBUS USB Bus Power-Supply Detection Input. Connect a resistor-divider between USB VBUS, KVBUS, and GND. SD CARD INTERFACE 13 C8 CDAT1_0 SD Card 1 Data Bus Analog Switch/Card Reader Interface. CDAT1_0 connects to DAT0 on the SD card. 12 B8 CDAT1_1 SD Data Card 1 Bus Analog Switch/Card Reader Interface. CDAT1_1 connects to DAT1 on the SD card. 11 C7 CDAT1_2 SD Data Card 1 Bus Analog Switch/Card Reader Interface. CDAT1_2 connects to DAT2 on the SD card. |
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