Users Manual
Models A2500R24A and A2500R24C
Contents
1.
Overview.............................................................................................................................. 5
1.1. A2500R24A .................................................................................................................... 5
1.2. A2500R24C .................................................................................................................... 5
1.3. Features .......................................................................................................................... 6
1.4. Theory of Operation ........................................................................................................ 6
1.4.1. Typical Flow ............................................................................................................ 9
1.5. Applications .................................................................................................................. 11
2.
Product Approvals ............................................................................................................. 12
2.1. USA (Federal Communications Commission, FCC,
) .............................................. 12
2.1.1. FCC Labeling Requirements ................................................................................. 12
2.1.2. End User Manual ................................................................................................... 13
2.1.3. RF Exposure ......................................................................................................... 13
2.2. Canada (Industry Canada, IC) ...................................................................................... 14
2.3. Europe (Conformité Européenne, ) ........................................................................... 15
2.4. Potential Interference Sources...................................................................................... 16
2.4.1. WLAN .................................................................................................................... 16
2.4.2. Bluetooth ............................................................................................................... 16
2.4.3. Microwave ovens ................................................................................................... 16
2.4.4. Other Interference ................................................................................................. 17
2.4.5. Time critical data ................................................................................................... 17
2.5. Approved Usage ........................................................................................................... 17
2.5.1. USA & Canada ...................................................................................................... 17
2.5.2. Europe ................................................................................................................... 18
3.
Electrical Characteristics ................................................................................................... 19
3.1. Absolute Maximum Ratings .......................................................................................... 19
3.2. Operating Conditions .................................................................................................... 20
3.3. Pin Out .......................................................................................................................... 20
3.4. Recommended Layout .................................................................................................. 22
3.5. Power Supply Considerations ....................................................................................... 24
A2500R24x – Users Manual
Release Date 01/10/11
Page 5 of 26
1. Overview
The A2500R24C and A2500R24A are surface mount modules with an integrated crystal,
internal voltage regulator, matching circuitry and filtering. The A2500R24A has an integral
antenna, whereas the A2500R24C utilizes an external antenna through a U.FL connector (see
Table 1). The modules operate in the global non-licensed 2.4GHz ISM/SRD frequency band and
are ideal for achieving low power wireless connectivity without having to deal with extensive RF,
antenna design and regulatory compliance, allowing quick time to market. The modules are
100% tested to provide consistent performance.
The A2500R24C and A2500R24A have received regulatory approvals for modular devices in
the United States (FCC), Canada (IC) and Europe (ETSI). The modular approval allows the
OEM or end user to place either an A2500R24A or an A2500R24C with an approved antenna
inside a finished product without having to perform costly regulatory testing for an intentional
radiator. Section 2 has information on the requirements for the end user/integrator must fulfill to
use the modules without intentional radiator regulatory testing.
The A2500R24C and A2500R24A are based on the CC2500 transceiver IC from Texas
Instruments. All control lines for the transceiver are provided at module level for full control of its
operation. Please see the CC2500 data sheet (www.ti.com) for how to control the modules.
Please see section 2.5 for the recommended register settings to achieve optimal performance
and regulatory compliance.
The A2500R24C and A2500R24A modules both measure 9x12x2.5mm and are footprint
compatible with each other.
1.1.
A2500R24A
The A2500R24A has an integral antenna, providing high efficiency and near omni-directional
radiation pattern. This approach offers the lowest system cost when the application allows
collocation of radio and antenna.
1.2.
A2500R24C
The A2500R24C has a compact antenna connector that allows for locating the antenna away
from the module due to form/function or in order to exit a metal enclosure, see section 3.2 for
more information on antenna location and enclosure considerations.
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