Data Sheet

Parameter Symbol Test Condition Min Typ Max Unit
RX Channel Power Indicator
Accuracy worst case with in-
put swetp from -60 dBm to
RX_SAT
RCPI
TOLS
802.11b: 1 Mbps — -4.5 — dB
802.11g: 6 Mbps — -2.8 — dB
802.11n: MCS=7 — -3.3 — dB
RX Channel Power Indicator
Accuracy Worst Case with
input signal swept from refer-
ence sensitivity to -69 dbm
RCPI
TOLW
802.11b: 1 Mbps — -1.3 — dB
802.11g: 6 Mbps — -1.4 — dB
802.11n: MCS=7 — -1.0 — dB
RX Channel power Indicator
Step Size
RCPI
STEP
802.11b: 1 Mbps — 0.5 — dB
802.11g: 6 Mbps — 0.5 — dB
802.11n: MCS=7 — 0.5 — dB
4.6 Reference Oscillator and Low Power Clock Characteristics
The WFM200S contains a built-in 38.4 MHz XTAL to generate the reference clock.
To achieve low power operation during power save modes, an external 32.768 KHz clock is required.
4.6.1 Low Power 32.768 kHz Clock Input Requirements
Table 4.6. Low Power 32.768 kHz Clock Input Requirements
Parameter Symbol Test Condition Min Typ Max Unit
Nominal Frequency of
LP_CLK
FNOM
LPCLK
— 32.768 — KHz
Frequency Tolerance of
LP_CLK over all conditions
1
FTOL
LPCLK
-1000 — 1000 ppm
Load of LP_CLK pin R
LPCLK
— 30 — KOhm
Input Level at LP_CLK SIGL
LPCLK
0.7 *
VDD_IO
— VDD_IO V p-p
Symmetry of LP_CLK DUTY
LPCLK
— 50 — %
Note:
1. To optimize power consumption in DTIM modes, it is recommended that the frequency drift of LP_CLK within 1 second be lower
than +- 100ppm.
4.7 Interface Terminal Characteristics
Unless otherwise indicated, typical conditions are: Operating Ambient Temp = 25 °C, V
VDD_IO
= V
VDD
= 1.8 V; V
VDD_PA
= 3.3V, center
frequency = 2,442 MHz, and measured by 50 Ω test equipment attached at pin.
4.7.1 Supply Terminal Specifications
There are three supply pins to attach to DC power sources: VDD_PA, VDD and VDD_IO.
Please refer to the section on 4.2 Operating Conditions for details on allowed voltages on these pins.
WFM200S Data Sheet
Electrical Specifications
silabs.com | Building a more connected world. Preliminary Rev. 0.51 | 14