USB82640 Datasheet, PDF (12/64 Pages) Microchip Technology – Automotive USB 2.0 Hub and Flash Media Card Controller Combo

USB82640
TABLE 5-1: USB82640 PIN DESCRIPTIONS (CONTINUED)
Symbol
XTAL2
48-Pin
VQFN
44
Buffer
Type
OCLKx
Description
24 MHz Crystal Output
This is the other terminal of the crystal, or a no
connect pin, when an external clock source is
used to drive XTAL1 (CLKIN).
If Pins not Used
Connection
N/A
Note:
Leave it open,
when an exter-
nal clock source
is used to drive
XTAL1 (CLKIN).
VDD18PLL
VDDA33
SPI_CE_N
SPI_CLK/
SCL
46
-
1.8 V PLL Power Bypass
This pin is the 1.8 V power bypass for the PLL.
This pin requires an external bypass capacitor
of 1.0 µF.
If REG_EN is low, this pin serves as a power
supply (1.8 V) for the device.
5
-
3.3 V Analog Power
41
• Pin 48 requires an external bypass capaci-
48
tor of 4.7 µF.
SPI Interface
8
O12
SPI Chip Enable
Leave open
This is the active low chip enable output. If the
SPI interface is enabled, drive this pin high in
power down states.
9
I/O12 SPI Clock
Leave open
This is the SPI clock out to the serial ROM. See
Section 5.4, "ROM BOOT Sequence" for dia-
gram and usage instructions.
During reset, this pin is driven low.
When configured, this is the I²C EEPROM clock Leave open
pin.
DS60001312A-page 12
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