Data Sheet
Table Of Contents
- 1 Design guidelines
- 2 Ordering Information
- 3 Pinout and Terminal Descriptions
- 4 Packaging
- 5 Power control
- 6 Interfaces
- 7 Block diagram
- 8 Example schematics
- 9 802.11 Radio
- 10 Firmware
- 11 Host interfaces
- 12 Electrical characteristics
- 13 RF Characteristics
- 14 Physical dimensions
- 15 Layout guidelines
- 16 Soldering recommendations
- 17 Certifications
- 18 Qualified Antenna Types for WF121-E
Silicon Labs
Page 40 of 45
17 Certifications
WF121 is compliant to the following specifications:
17.1 CE
WF121 is in conformity with the essential requirements and other relevant requirements of the R&TTE
Directive (1999/5/EC). The product is conformity with the following standards and/or normative documents.
• EMC (immunity only) EN 301 489-17 V.2.2.1 in accordance with EN 301 489-1 V1.9.2
• Radiated emissions EN 300 328 V1.9.1
• Safety standards: EN 60950-1:2006 + A11:2009 + A1:2010 + A12:2011 + A2:2013
17.2 FCC and IC
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
(1) this device may not cause harmful interference, and
(2) this device must accept any interference received, including interference that may
cause undesired operation.
FCC RF Radiation Exposure Statement:
This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. End
users must follow the specific operating instructions for satisfying RF exposure compliance. This transmitter
must not be co-located or operating in conjunction with any other antenna or transmitter. This transmitter is
considered as mobile device and should not be used closer than 20 cm from a human body. To allow portable
use in a known host class 2 permissive change is required. Please contact support at http://www.silabs.com/
for detailed information.
IC Statements:
This device complies with Industry Canada license-exempt RSS standard(s). Operation is subject to the
following two conditions: (1) this device may not cause interference, and (2) this device must accept any
interference, including interference that may cause undesired operation of the device.
Under Industry Canada regulations, this radio transmitter may only operate using an antenna of a type and
maximum (or lesser) gain approved for the transmitter by Industry Canada. To reduce potential radio
interference to other users, the antenna type and its gain should be so chosen that the equivalent isotropically
radiated power (e.i.r.p.) is not more than that necessary for successful communication.
If detachable antennas are used:
This radio transmitter (identify the device by certification number, or model number if Category II) has been
approved by Industry Canada to operate with the antenna types listed below with the maximum permissible
gain and required antenna impedance for each antenna type indicated. Antenna types not included in this list,