Specifications

Cinterion
®
ALAS66A Hardware Interface Overview
2 Interface Characteristics
33
 ALAS66A_HIO_v01.000a 2019-02-26
Confidential / Released
Page 17 of 51
2 Interface Characteristics
ALAS66A is equipped with an SMT application interface that connects to the external applica-
tion. The SMT application interface incorporates the various application interfaces as well as
the RF antenna interface.
2.1 Application Interface
2.1.1 USB Interface
ALAS66A 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 debugging interface.
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
ALAS66A is designed as a self-powered device compliant with the “Universal Serial Bus Spec-
ification Revision 3.0”
1
.
Figure 2: 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. Furthermore, the USB driver
distributed with ALAS66A needs to be installed.
1. The specification is ready for download on http://www.usb.org/developers/docs/
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
1µF
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