Ultra Fast USB 2.0
Table 6.1 USB2640/USB2641 Pin Descriptions (continued)
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NAME | SYMBOL | QFN | TYPE | DESCRIPTION |
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| MISC |
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General Purpose | GPIO1 / | 37 | I/O12 | GPIO: This pin may be used either as input, edge |
I/O | LED1 / |
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| sensitive interrupt input, or output. |
| TXD |
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| LED: In addition, as an output, the GPIO1 can be | |
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| used as output controlled by the LED1_GPIO1 |
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| register. |
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| TXD: The signal can be used as input to the TxD |
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| of UART in the device when the TXD_SEL bit in |
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| UTIL_CONFIG1 register is cleared to "0". |
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General Purpose | GPIO2 / RXD | 36 | I/O12 | GPIO: This pin may be used either as input, edge |
I/O |
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| sensitive interrupt input, or output. |
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| RXD: In addition to the above, the signal can be |
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| used as input to the RXD of UART in the device |
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| when the RXD_SEL bit in UTIL_CONFIG1 register |
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| is cleared to "0". |
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General Purpose | GPIO10 | 35 | I/O200 | These pins may be used either as input, edge |
I/O | (CRD_PWR) |
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| sensitive interrupt input, or output. It is a |
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| requirement that this is the only FET used to |
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| power xD devices. Failure to do this will violate xD |
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| voltage specification on xD device pins. |
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| Card power drive: 3.3V (100 mA or 200 mA) |
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RESET input | nRESET | 38 | IS | This active low signal is used by the system to |
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| reset the chip. The active low pulse should be at |
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| least 1 μs wide. |
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TEST Input | TEST | 40 | I | This signal is used for testing the chip. If the test |
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| function is not used, tie this pin low externally. |
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| DIGITAL / POWER / GROUND | ||
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1.8V Digital Core | VDD18 | 15 |
| +1.8V Core power bypass. This requires an |
Power Bypass |
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| external bypass capacitor of 1.0 μF minimum. |
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3.3V Power & | VDD33 | 12 |
| 3.3V Power & Regulator Input. |
Voltage |
| 16 |
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Regulator Input |
| 25 |
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| 34 |
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Ground | VSS | SLUG |
| Ground Reference |
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No Connects | NC | 22 |
| No connect pins only apply to the USB2641. No |
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| 26 |
| trace or signal should be routed/attached to these |
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| 27 |
| pins. |
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| 28 |
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Revision 2.0 | 22 | SMSC USB2640/USB2641 |
| DATASHEET |
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