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Ultra Fast USB 2.0 Memory Stick Flash Media Controller
Datasheet
Revision 1.0 (05-27-08) 12 SMSC USB2242/USB2242i
DATASHEET
General Purpose
I/O
GPIO7 /
TXD /
SCK /
MS_SKT_SEL
31 I/O12 GPIO: This pin may be used either as
input, edge sensitive interrupt input, or
output.
O12 TXD: In addition, as an output, the GPIO7
can be used as an output TXD of UART in
the device, when the GPIO2/TXD bit in
UTL_CONFIG register is set to "1"
O12 SCK: This is the clock output when used
with an external EEPROM.
I MS_SKT_SEL: On the positive edge of
nRESET, this pin is sampled to determine
the Memory Stick socket size.
1 = 8 bit
0 = 4 bit
General Purpose
I/O
GPIO10
(CRD_PWR)
21 I/O200 GPIO: This pin may be used either as
input, edge sensitive interrupt input, or
output.
CRD_PWR: Card Power drive of 3.3V @
either 100mA or 200mA.
General Purpose
I/O
GPIO14 19 I/O12 This pin may be used either as input, edge
sensitive interrupt input, or output.
General Purpose
I/O
GPIO15 26 I/O12 This pin may be used either as input, edge
sensitive interrupt input, or output.
RESET Input nRESET 18 IS This active low signal is used by the
system to reset the chip. The active low
pulse should be at least 1μs wide.
TEST Input TEST 28 I This signal is used for testing the chip.
User should normally tie this pin low
externally if the test function is not used.
No Connects NC 12
15
16
17
25
No Connect. No trace or signal should be
routed/attached to these pins.
DIGITAL / POWER
+1.8V Core power VDD18 13 +1.8V core power. This pin must have a
1.0
μF (or greater) ±20% (ESR <0.1Ω)
capacitor to VSS.
3.3V Power &
Regulator Input.
VDD33 6
14
22
3.3V Power & Regulator Input.
Ground VSS SLUG Ground Reference
Table 5.2 USB2242/2242i 36-Pin QFN Pin Descriptions (continued)
NAME SYMBOL 36-PIN QFN
BUFFER
TYPE DESCRIPTION