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 20 of 45
6.6 Analog inputs
Pad number Function
2 AN15
14 AN1
15 AN0
17 AN8
19 AN14
20 AN13
21 AN12
22 AN11
23 AN10
24 AN5
Table 7: ADC pads
The microcontroller provides a 10-bit Analog to digital converter (ADC) with sampling speeds up to 1MSps.
The measurement can be done on any of the input pins listed in the table above.
6.7 Microcontroller programming interface
Pad number Pad function Description
13 MCLR Reset
14 PGEC1 Programming Clock
15 PGED1 Programming Data
20 TDI JTAG Test Data In
21 TCK JTAG Test Clock
22 TDO JTAG Test Data out
23 TMS JTAG Test Machine State
Table 8: Programming and JTAG pads
An ICSP (In-Circuit Serial Programming) interface (PGEC1, PGED1, MCLR) is provided to allow device re-
flashing using a Microchip tool. A JTAG connection is also provided which can be used for system debugging
purposes or device programming. For information on JTAG operation, please refer to Microchip
documentation.