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6.9. USB
The USB module can be configured as Host, Device or OTG with the correct switch settings on SW6.
Function / Device / Slave mode: This mode does not take any external power circuitry to implement. Simply put the
SW6 DIP switches to the proper setting as in table 6-7 and configure the software appropriately.
Host mode: Connect the included MiniAB to Host adapter Cable to have the proper cable connection for USB Host.
This mode uses U12 and associated passive circuitry to create USB Power. Set SW6 DIP switches to the settings
shown in table 6-7. Note that you will have to add an external 5V regulated supply that sources 1 Amp or greater to J4 in
order to meet the USB Specification for power delivery (500ma).
OTG: Set SW6 DIP switches to the settings shown in table 6-7. Note that the Maxim MAX3353EEUE and associated
circuitry will create the proper USB OTG voltages. Note the Maxim IC must be configured in software using the I2C bus
(Address 0x58) for proper operation. Note that you will have to add an external 5V regulated supply that sources more
than 1 Amp to J4 in order to meet the USB Specification for power delivery (500ma).
Table 6-6 contains details of the USB signal descriptions and pin connections. Table 6-7 details how to set the SW6 DKP
switches for each USB mode.
Description
USB_VBUS
USD+
USD-
VCC_USB
VSS_USB
USB_DPUPEA
USB _ID
USB_OVRCURA_DPUPEB
USB_DRPD
USB_DPRPD
USB0_EXICEN
USB cable connection monitor pin
USB data I/O pin
USB data I/O pin
Power supply pin for USB built-in transceiver
Ground pin for USB built-in transceiver
Pull-up control pin A
OTG USB ID
Host / OTG Over-current detect / Function Pull-up control pin B
D- Pull Down
D+ Pull Down
Expansion
Table 6-6: USB Pin Definitions
13
Function
Microcontroller
Pin Number
30
37
36
35
38
25
28
32
26
23
27
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