SMSC USB2242 User Manual
Page 12
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 1
μs 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
μ
F (or greater) ±20% (ESR <0.1
Ω)
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