USB2226 Datasheet, PDF (15/23 Pages) SMSC Corporation – 4th Generation USB 2.0 Flash Media Controller with Integrated Card Power FETs

4th Generation USB 2.0 Flash Media Controller with Integrated Card Power FETs
Datasheet
SYMBOL
CF_nPWR
128-PIN
VTQFP
105
SM/xD_PWR
79
SD/MMC_PWR
44
CLK_SEL[1:0]
92
93
BUFFER
TYPE
DESCRIPTION
I/O8
CF Card Power Control:
This active low output is intended to drive an external power control
P-FET which will supply the CF card with power.
I/O8
SM / xD Card Power drive of 3.3V @ 100mA.
I/O8
SD / MMC Card Power drive of 3.3V @ 200mA.
I/O8
Clock Select:
These pins will select the maximum clock rate that the interface will
operate at.
Table 5.1 CLK_SEL[1:0] Assignments
CLK_SEL1 CLK_SEL0
CLOCK RATE
X
1
SD/MMC and MS max clock
is 15Mhz
0
0
SD/MMC max clock is 48Mhz;
MS clock is set normally
1
0
SD/MMC max clock is 24Mhz;
MS clock is set normally
nRESET
nTEST[1:0]
VDD18
VDD33
VSS
115
IS
RESET input:
This active low signal is used by the system to reset the chip. The
active low pulse should be at least 1μs wide.
95
I
TEST input:
96
These signals are used for testing the chip. User should normally tie
them high externally, if the test function is not used.
DIGITAL POWER, GROUNDS, and NO CONNECTS
49
1.8v Digital Core Power:
106
+1.8V Core power
All VDD18 pins must be connected together on the circuit board.
3
3.3v Power & Voltage Regulator Input:
43
80
3.3V Power & Regulator Input.
100
108
pins 100 & 108 supply 3.3V power to the internal 1.8V regulators.
109
15
Ground:
16
47
Ground Reference
84
85
97
112
SMSC USB2226
15
DATASHEET
Revision 1.4 (10-08-07)