Ultra Fast USB 2.0 SD/MMC Flash Media Controller
Datasheet
Table 5.2 USB2244/2244i
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| BUFFER |
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NAME | SYMBOL | QFN | TYPE | DESCRIPTION |
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24MHz Crystal | XTAL1 | 33 | ICLKx | This pin can be connected to one terminal of |
or external clock | (CLKIN) |
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| the crystal or it can be connected to an external |
input |
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| 24 clock when a crystal is not used. |
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24MHz Crystal | XTAL2 | 32 | OCLKx | This is the other terminal of the crystal, or it can |
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| be left open when an external clock source is |
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| used to drive XTAL1(CLKIN). It may not be |
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| used to drive any external circuitry other than |
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| the crystal circuit. |
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3.3V Analog | VDDA33 | 36 |
| 3.3V Analog Power |
Power |
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1.8V PLL Power | VDD18PLL | 34 |
| This pin is the 1.8V Power for the PLL. |
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| +1.8V Filtered analog power for internal PLL. |
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| This pin must have a 1.0μF(or greater) ±20% |
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| (ESR <0.1Ω) capacitor to VSS. |
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| MISC |
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General Purpose | GPIO1 (LED1) | 1 | I/O12 | This pin may be used either as input, edge |
I/O |
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| sensitive interrupt input, or output. |
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| In addition, as an output, the GPIO1 can use |
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| output controlled by the LED1_GPIO1 register. |
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General Purpose | GPIO2 / RXD / | 27 | I/O12 | GPIO: This pin may be used either as input, |
I/O | SDA |
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| edge sensitive interrupt input, or output. |
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| I | RXD: In addition to the above, the signal can |
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| be used as input to the RXD of UART in the |
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| device, when the TXD_RXD_SEL bit in |
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| UTIL_CONFIG1 register is cleared to "0". |
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| I/O12 | SDA: This is the data pin when used with an |
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| external serial EEPROM. |
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General Purpose | GPIO4 | 29 | I/O12 | This pin may be used either as input, edge |
I/O |
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| sensitive interrupt input, or output. |
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General Purpose | GPIO7 / | 31 | I/O12 | GPIO: This pin may be used either as input, |
I/O | TXD / |
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| edge sensitive interrupt input, or output. |
| SCK |
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| O12 | TXD: In addition, as an output, the GPIO7 can | |
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| ||
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| be used as an output TXD of UART in the |
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| device, when the GPIO2/TXD bit in |
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| UTL_CONFIG register is set to "1" |
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| O12 | SCK: This is the clock output when used with |
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| an external EEPROM. |
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General Purpose | GPIO10 | 21 | I/O200 | GPIO: This pin may be used either as input, |
I/O | (CRD_PWR) |
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| edge sensitive interrupt input, or output. |
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| CRD_PWR: Card Power drive of 3.3V @ either |
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| 100mA or 200mA. |
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General Purpose | GPIO14 | 19 | I/O12 | This pin may be used either as input, edge |
I/O |
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| sensitive interrupt input, or output. |
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RESET Input | nRESET | 18 | IS | This active low signal is used by the system to |
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| reset the chip. The active low pulse should be |
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| at least 1μs wide. |
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SMSC USB2244/USB2244i |
| 11 | Revision 1.0 | |
DATASHEET