Specifications

Cinterion
®
BGS5 Hardware Interface Overview
2 Interface Characteristics
23
 BGS5_HID_v00.341 2013-09-23
Confidential / Preliminary
Page 11 of 41
2 Interface Characteristics
BGS5 is equipped with an SMT application interface that connects to the external application.
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
BGS5 supports a USB 2.0 Full Speed (12Mbit/s) device interface. The USB interface is primar-
ily 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
BGS5 is designed as a self-powered device compliant with the “Universal Serial Bus Specifi-
cation Revision 2.0”
1
.
Figure 2: USB circuit
To properly connect the module's USB interface to the host a USB 2.0 compatible connector is
required. Furthermore, the USB modem driver distributed with BGS5 needs to be installed.
While the USB connection is active, the module will not change into SLEEP mode. Switching
between active and SLEEP mode is controlled by the VUSB_IN signal. Only if VUSB_IN is low,
will the module switch to SLEEP mode. Therefore, VUSB_IN must be disabled or set to low
1. The specification is ready for download on http://www.usb.org/developers/docs/
VBUS
DP
DN
VREG (3V075)
BATT+
USB_DP
2)
lin. reg.
GND
Module
Detection only
VUSB_IN
USB part
1)
RING0
Host wakeup
1)
All serial (including R
S
) and pull-up resistors for data lines are implemented.
USB_DN
2)
2)
If the USB interface is operated in High Speed mode (480MHz), it is recommended to take
special care routing the data lines USB_DP and USB_DN. Application layout should in this
case implement a differential impedance of 90Ohm for proper signal integrity.
R
S
R
S
SMT