Specifications

Table Of Contents
Cinterion
®
ALAS5V Hardware Interface Description
2.1 Application Interface
67
ALAS5V_HID_v00.030a 2019-03-20
Confidential / Preliminary
Page 30 of 124
2.1.3 USB Interface
ALAS5V supports a USB 3.0 Super Speed (5Gbps) device interface, and alternatively a USB
2.0 device interface that is High Speed compatible. The USB interface is primarily intended for
use as command and data interface, and for downloading firmware.
The USB host is responsible for supplying the VUSB_IN line. This line is for voltage detection
only. The USB part (driver and transceiver) is supplied by means of BATT+. This is because
ALAS5V is designed as a self-powered device compliant with the “Universal Serial Bus Spec-
ification Revision 3.0”
1
.
Figure 5: USB circuit
To properly connect the module's USB interface to the external application, a USB 3.0 or 2.0
compatible connector and cable or hardware design is required. For further guidelines on im-
plementing the external application’s USB 3.0 or 2.0 interface see [4] and [5]. For more infor-
mation on the USB related signals see Table 4. Furthermore, the USB modem driver distributed
with ALAS5V needs to be installed.
While a USB connection is active, the module will never switch into SLEEP mode. Only if the
USB interface is in Suspended state or Detached (i.e., VUSB_IN = 0) is the module able to
switch into SLEEP mode thereby saving power
2
.
1. The specification is ready for download on http://www.usb.org/developers/docs/
2. Please note that if the USB interface is employed, and a USB cable is connected, there should also be
a terminal program linked to the USB port in order to receive and process the initial SYSSTART URC
after module startup. Otherwise, the SYSSTART URC remains pending in the USB driver's output buffer
and this unprocessed data prevents the module from power saving.
BATT+
USB_DP
c)
lin. reg.
GND
Module
Detection only
VUSB_IN
b)
USB part
a)
a)
All serial (including R
S
) and pull-up resistors for data lines are implemented .
USB_DN
c)
c)
If the USB interface is operated with super or high speeds, it is recommended to take special care routing the data
lines. Application layout should implement a differential impedance of 90 ohms for proper signal integrity .
VBUS
F
b)
Since VUSB_IN is used for detection only it is recommended not to add any further blocking capacitors on
the VUSB_IN line.
USB_SSRX_N
c)
USB_SSRX_P
c)
USB_SSTX_N
c)
USB_SSTX_P
c)
USB_SS
_PHY
USB_HS
_PHY
USB 2.0
Controller
USB 3.0
Controller
2.0
2.0
3.0
100nF
100nF
SMT