Specifications
Table Of Contents
- Contents
- Tables
- Figures
- 1 Introduction
- 2 Interface Characteristics
- 2.1 Application Interface
- 2.1.1 Pad Assignment
- 2.1.2 Signal Properties
- 2.1.3 USB Interface
- 2.1.4 Serial Interface ASC0
- 2.1.5 Serial Interface ASC1
- 2.1.6 Inter-Integrated Circuit Interface
- 2.1.7 UICC/SIM/USIM Interface
- 2.1.8 Enhanced ESD Protection for SIM Interfaces
- 2.1.9 Digital Audio Interface
- 2.1.10 Analog-to-Digital Converter (ADC)
- 2.1.11 RTC Backup
- 2.1.12 GPIO Interface
- 2.1.13 Control Signals
- 2.1.14 JTAG Interface
- 2.1.15 eMMC Interface
- 2.2 GSM/UMTS/LTE Antenna Interface
- 2.3 GNSS Antenna Interface
- 2.4 Sample Application
- 2.1 Application Interface
- 3 GNSS Interface
- 4 Operating Characteristics
- 5 Mechanical Dimensions and Mounting
- 6 Regulatory and Type Approval Information
- 7 Document Information
- 8 Appendix
Cinterion
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ALAS5V Hardware Interface Description
2.4 Sample Application
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ALAS5V_HID_v00.030a 2019-03-20
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2.4 Sample Application
Figure 24 shows a typical example of how to integrate an ALAS5V module with an application.
The PWR_IND line is an open collector that needs an external pull-up resistor which connects
to the voltage supply VCC µC of the microcontroller. Low state of the open collector pulls the
PWR_IND signal low and indicates that the ALAS5V module is active, high level notifies the
Power Down mode.
If the module is in Power Down mode avoid current flowing from any other source into the mod-
ule circuit, for example reverse current from high state external control lines. Therefore, the
controlling application must be designed to prevent reverse flow.
While developing SMT applications it is strongly recommended to provide test points
for certain signals, i.e., lines to and from the module - for debug and/or test purposes.
The SMT application should allow for an easy access to these signals. For details on
how to implement test points see [3].
The EMC measures are best practice recommendations. In fact, an adequate EMC strategy for
an individual application is very much determined by the overall layout and, especially, the po-
sition of components.
Some LGA pads are connected to clocks or high speed data streams that might interfere with
the module’s antenna. The RF receiver would then be blocked at certain frequencies (self in-
terference). The external application’s PCB tracks connected to these pads should therefore
be well shielded or kept away from the antenna. This applies especially to the USB and UICC/
SIM interfaces.
Depending on the micro controller used by an external application ALAS5V‘s digital input and
output lines may require level conversion. Section 2.4.2 shows a possible sample level conver-
sion circuit.
The analog-to-digital converter (ADCx_IN lines) can be used for antenna diagnosis. A sample
antenna detection circuit can be found in Figure 26 and Figure 27.
Disclaimer:
No warranty, either stated or implied, is provided on the sample schematic diagram shown in
Figure 24 and the information detailed in this section. As functionality and compliance with na-
tional regulations depend to a great amount on the used electronic components and the indi-
vidual application layout manufacturers are required to ensure adequate design and operating
safeguards for their products using ALAS5V modules.