Integration Manual
Table Of Contents
- Contents
- Tables
- Figures
- 0. Document History
- 1. Introduction
- 2. Product Concept
- 3. Application Interface
- 4. Antenna Interface
- 5. Electrical, Reliability and Radio Characteristics
- 6. Mechanics
- 7. Board-to-Board Application Connector
- 8. Reference Approval
HMS1 Hardware Interface Description
Confidential / Preliminary
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HMS1_HD_V01.62 Page 21 of 39 2006-08-21
3.4. Power Saving
Intended for power saving, SLEEP mode reduces the functionality of the HMS1 to a
minimum and thus minimizes the current consumption.
The different sleep modes will be specified later.
3.5. RTC Backup
The internal Real Time Clock of HMS1 is supplied from a separate voltage regulator in the
analog controller which is also active when HMS1 is in POWER DOWN status.
In addition, you can use the VDDLP pin on the board-to-board connector to backup the RTC
from an external capacitor or a battery (rechargeable or non-chargeable). The capacitor or
battery is charged by the power management controller of HMS1. If the voltage supply at
BATT+ is disconnected, the RTC can be powered by the capacitor or battery. The size of the
capacitor determines the duration of buffering when no voltage is applied to HMS1, i.e. the
larger the capacitor the longer HMS1 will save the date and time.
3.6. USIM Interface
The base band processor has an integrated SIM interface compatible with the 34.121 USIM
Testing IC Card standard. This is wired to an integrated SIM card holder. The USIM interface
supports 3V and 1.8V USIM cards.
Note: No guarantee can be given, nor any liability accepted, if loss of data is encountered
after removing the SIM card during operation.
Also, no guarantee can be given for properly initializing any SIM card that the user
inserts after having removed a SIM card during operation.
3.7. USB Interface
HMS1 supports a USB 1.1 Full Speed (12Mbit/s) device interface. The USB interface is the
recommended communication interface for high speed data transmission.
To properly connect the module’s USB interface to the host a USB 2.0 full speed compatible
connector is required. The HMS1 distribution contains the suitable USB driver to operate
HMS1 over USB. It is recommended to use this drive.
The USB host is responsible for supplying, across the VUSB_IN line, power to the module’s
USB interface, but not to other HMS1 interfaces. This is because HMS1 is designed as a
self-powered device compliant with the “Universal Serial Bus Specification Revision 1.1” (The
specification is ready for download on
http://www.usb.org/developers/docs/).