USB2640I Standard Microsystems Corp., USB2640I Datasheet - Page 22

• Manufacturer Part Number: USB2640I
• Description: Industrial Temperature Usb 2.0 Flash Media Controller And Usb Hub Combo
• Manufacturer: Standard Microsystems Corp.

Revision 2.0 (10-03-08)
General Purpose
I/O
General Purpose
I/O
General Purpose
I/O
RESET input
TEST Input
1.8V Digital Core
Power Bypass
3.3V Power &
Voltage
Regulator Input
Ground
No Connects
NAME
GPIO2 / RXD
(CRD_PWR)
SYMBOL
nRESET
GPIO1 /
GPIO10
VDD18
VDD33
LED1 /
TEST
Table 6.1 USB2640i/USB2641i Pin Descriptions (continued)
TXD
VSS
NC
48-PIN
SLUG
QFN
DIGITAL / POWER / GROUND
37
36
35
38
40
15
12
16
25
34
22
26
27
28
Industrial Temperature USB 2.0 Flash Media Controller and USB Hub Combo
DATASHEET
BUFFER
I/O200
TYPE
I/O12
I/O12
IS
MISC
I
22
DESCRIPTION
GPIO: This pin may be used either as input, edge
sensitive interrupt input, or output.
LED: In addition, as an output, the GPIO1 can be
used as output controlled by the LED1_GPIO1
register.
TXD: The signal can be used as input to the TxD
of UART in the device when the TXD_SEL bit in
UTIL_CONFIG1 register is cleared to "0".
GPIO: This pin may be used either as input, edge
sensitive interrupt input, or output.
RXD: In addition to the above, the signal can be
used as input to the RXD of UART in the device
when the RXD_SEL bit in UTIL_CONFIG1 register
is cleared to "0".
These pins may be used either as input, edge
sensitive interrupt input, or output. It is a
requirement that this is the only FET used to
power xD devices. Failure to do this will violate xD
voltage specification on xD device pins.
Card power drive: 3.3V (100 mA or 200 mA)
This active low signal is used by the system to
reset the chip. The active low pulse should be at
least 1 μs wide.
This signal is used for testing the chip. If the test
function is not used, tie this pin low externally.
+1.8V Core power bypass. This requires an
external bypass capacitor of 1.0 μF minimum.
3.3V Power & Regulator Input.
Ground Reference
No connect pins only apply to the USB2641i. No
trace or signal should be routed/attached to these
pins.
SMSC USB2640i/USB2641i