THEMIS
THEMIS User Manual - Rev. First Edition: 1.0 - Last Edition: 2.2 - Author: A.R. - Reviewed by S.R. -Copyright © 2022 SECO S.p.A.
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USB Connectors
On THEMIS board there are two USB ports directly available on external connectors.
The USB downstream port #4 managed by the USB HSIC Hub is available on a 5-pin p1.27mm
connector type Molex p/n 53398-0571 or equivalent, with pinout shown in the table on the left.
Mating connector: MOLEX 51021-0500 receptacle with 50079-8000 female crimp terminals.
Signal Description of this port:
/USB_P4-: USB Port #4 differential pair; it is managed by Microchip USB4604 Hub controller
’
s Downstream
Port #4.
+5V
USB4
voltage is derived from +5V_ALW power rail using a 600mA power switch.
In addition, there is an USB OTG Port, managed directly by the i.MX8 processor, which is carried to
a standard micro-AB connector, described in the table on the left.
Depending on the needed use of the system, it is necessary to connect micro-A or micro-B USB
cables to connector CN44
A micro-A USB cable has to be used when the system has to work in Host mode. In this case, USB_VBUS is a power
output of THEMIS Board for the connected device.
When a micro-B USB cable is used, its USB_ID pin is floating; this way, the board acknowledges that it must configure
itself to work as a Client. In this case, USB_VBUS is an input of the carrier board from the external Host.
Signal description of this port:
US/USB_OTG_D-: USB OTG Port #1 differential pair.
USB_VBUS: USB voltage rail. It is an input for USB port working in Client mode, an output for Host mode.
USB_ID: Client/Host identification signal. This signal is high when the USB port works in client mode, is low when works in Host mode.
TRSS Audio jack
On THEMIS board, audio functionalities are controlled by an I2S Audio Codec type
TLV320AIC3204IRHBR.
It is possible to have Stereo Line Out and Mic In Audio functionalities, all of them on a single TRRS
Combo Audio Jack, i.e. a single jack which offer both stereo Line Out and Mic In functionalities.
Such TRRS Combo Audio jack can be used with any 4-poles 3.5mm diameter audio jack, with pinout compatible with
the most recent Headsets, shown in the table on the left.
USB 2.0 Internal Header CN20
Pin
Signal
1
+5V
USB4
2
USB_P4-
3
4
GND
5
SHLD (GND)
USB micro-AB connector CN44
Pin Signal
1
USB_VBUS
2
USB_OTG_D-
3
US
4
USB_ID
5
SHLD (GND)
TRRS Audio jack- CN40
Pin
Signal
TIP
Headphone Out Left Channel
RING1
Headphone Out Right Channel
RING2
GND
SLEEVE MIC_IN
