Gemalto M2M GmbH ALS1-US Manual Do Utilizador

®

6 Sample Application

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ALS1-US_HIO_v01.000

2013-08-14

Confidential / Preliminary

Page 28 of 34

 shows a typical example of how to integrate an ALS1-US 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 ALS1-US 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.

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.

Disclaimer:

No warranty, either stated or implied, is provided on the sample schematic diagram shown in 

 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 ALS1-US modules.