USB5742 Datasheet, PDF (12/46 Pages) Microchip Technology – 2-Port SS/HS USB Controller Hub

USB5742
TABLE 3-5: SPI/SMBUS PIN DESCRIPTIONS
Num
Pins
Symbol
SPI_CE_N
GPIO7
Buffer
Type
O12
I/O12
Description
Active low SPI chip enable output.
General purpose input/output 7.
Non-Removable Port Configuration Strap.
1
CFG_NON_REM
This configuration strap is used to configure the number of non-
I
removable ports. Refer to Section 3.4.3, "Non-Removable Port Con-
figuration (CFG_NON_REM)" for more information.
SPI_CLK
1
SMCLK
GPIO4
SPI_DO
1
SMDAT
GPIO5
SPI_DI
GPIO9
1
CFG_BC_EN
O6
OD12
I/O6
O6
I/O12
I/O6
IS
I/O12
I
See Note 3.
SPI clock output to the serial ROM, when configured for SPI opera-
tion.
SMBus clock pin, when configured for SMBus slave operation.
General purpose input/output 4.
SPI data output, when configured for SPI operation.
SMBus data pin, when configured for SMBus slave operation.
General purpose input/output 5.
SPI data input, when configured for SPI operation.
General purpose input/output 9.
Battery Charging Configuration Strap.
This configuration strap is used to enable battery charging. Refer to
Section 3.4.4, "Battery Charging Configuration (CFG_BC_EN)" for
more information.
See Note 3.
Note 3: Configuration strap values are latched on Power-On Reset (POR) and the rising edge of RESET_N (external
chip reset). Configuration straps are identified by an underlined symbol name. Signals that function as con-
figurations traps must be augmented with an external resistor when connected to a load. Refer to Section
3.4, "Configuration Straps and Programmable Functions" for additional information.
TABLE 3-6: MISCELLANEOUS PIN DESCRIPTIONS
Num
Pins
1
1
1
1
Symbol
RESET_N
XTALI
CLK_IN
XTALO
RBIAS
Buffer
Type
IS
ICLK
ICLK
OCLK
AI
Description
The RESET_N pin puts the device into Reset Mode, as the name of
the pin and function then align.
External 25 MHz crystal input
External reference clock input.
The device may alternatively be driven by a single-ended clock oscil-
lator. When this method is used, XTALO should be left unconnected.
External 25 MHz crystal output
A 12.0 k (+/- 1%) resistor is attached from ground to this pin to set
the transceiver’s internal bias settings.
DS00002016B-page 12
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