Atmel Wireless LAN Access Point Manual de usuario descargar pdf (Pagina 15)

Atmel ATWILC1500-MR [PRELIMINARY DATASHEET]

Atmel-42376A-ATWINC1500-MR210P-SmartConnect-Datasheet_102014

enabled. However, any pin which is used should have the pull-up resistor disabled. The reason for this is that if

any pins are driven to a low level while the ATWINC1500-MR210P is in the low power sleep state, current will

flow from the VDDIO supply through the pull-up resistors, increasing the current consumption of the module.

Since the value of the pull-up resistor is approximately 100K, the current through any pull-up resistor that is

being driven low will be VDDIO/100K. For VDDIO = 3.3V, the current through each pull-up resistor that is driven

low would be approximately 3.3V/100K = 33µA. Pins which are used and have had the programmable pull-up

resistor disabled should always be actively driven to either a high or low level and not be allowed to float.

See the ATWINC1500-MR210PA Programming Guide for information on enabling/disabling the programmable

pull up resistors.

8. Recommended Footprint (Unit: mm)

Figure 8-1. Footprint Drawing

9. RF Performance Placement Guidelines

It is critical to follow the recommendations listed below to achieve the best RF performance:

 Module must be placed on main board - printed antenna area must overlap with the carrier board. The

portion of the module containing the antenna should not stick out over the edge of the main board. The

antenna is designed to work properly when it is sitting directly on top of a 1.5mm thick printed circuit

board.

 If the module is placed at the edge of the main board, a minimum 22mm by 5mm area directly under the

an-tenna must be clear of all metal on all layers of the board. "In-land" placement is acceptable; however

deep-ness of keep-out area must grove to: module edge to main board edge plus 5mm. DO NOT PLACE

MODULE IN THE MIDDLE OF THE MAIN BOARD OR FAR AWAY FROM THE MAIN BOARD EDGE.

 Keep away from antenna, as far as possible, large metal objects to avoid electromagnetic field blocking.

 Do not enclose the antenna within a metal shield.

 Keep any components which may radiate noise or signals within the 2.4GHz - 2.5GHz frequency band far

away from the antenna or better yet, shield those components. Any noise radiated from the main board in

this frequency band will degrade the sensitivity of the module.

 Please contact Atmel for assistance if any other placement is required.

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