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USB82640 数据表(PDF) 13 Page - Microchip Technology |
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USB82640 数据表(HTML) 13 Page - Microchip Technology |
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13 / 64 page  2010-2015 Microchip Technology Inc. DS60001312A-page 13 USB82640 SPI_DO/ 10 I/O12 SPI Data Out This is the data out for the SPI port. See Section 5.4, "ROM BOOT Sequence" for diagram and usage instructions. Leave open SDA This pin is the data pin when the device is con- nected to the optional I²C EEPROM. Leave open SPI_SPD_SEL This pin is used to pick the speed of the SPI interface. During RESET_N assertion, this pin will be tri-stated with the weak pull-down resistor enabled. When RESET_N is negated, the value on the pin will be internally latched, and the pin will revert to SPI_DO functionality. Additionally, the internal pull-down will be disabled. 0 : 30 MHz (deprecated and might be removed in future versions) 1 : 60 MHz If the latched value is 1, then the pin is tri-stated when the chip is in the suspend state. If the latched value is 0, then the pin is driven low during a suspend state. Leave open SPI_DI 11 I/O12PD SPI Data In This is the data in to the controller from the SPI ROM. This pin has a weak internal pull-down applied at all times to prevent floating. Leave open Misc GPO1/ 37 I/O12 This general purpose pin is set to be used as an output. Leave open LED/ GPO1 can be used as an LED output TXD This signal can be used as input to the TxD of UART in the device. Custom firmware is required to activate this alternate function. RXD 36 I/O12 This signal can be used as input to the RXD of UART in the device. Custom firmware is required to activate this alternate function. Leave open CRD_PWR 35 I/O200 Card power drive: 3.3 V (200 mA) This pin powers the multiplexed flash media interface (slot) for the SD/MMC interface. Bits 0, 1, 2, and 3 control FET 2 of Register A5h. See Section 7.3.2.11, "A4h-A5h: LUN 0 Power Configuration," on page 28 for more information. Leave open TABLE 5-1: USB82640 PIN DESCRIPTIONS (CONTINUED) Symbol 48-Pin VQFN Buffer Type Description If Pins not Used Connection |
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