W55RFS27R3C Datasheet, PDF (7/13 Pages) Winbond – Super-Regeneration RF Receiver

W55RFS27R3C
2.2 W55RFS27R3C Functional Description
ChannelShared^WB Protocol Engine
The W55RFS27R3C / W55RFS27T3B built-in ChannelShared^WB protocol allows a maximum of three
players simultaneously in the same frequency band. Each player is distinguished by the input states of
ID1 and ID0, instead of different frequencies. This approach significantly reduces the cost and
complexity of multi-player applications.
Frequency Hopping and HOP_CLK
In manual-mode, the W55RFS27R3C can automatically toggle the center frequency very slightly to
increase the receiver sensitivity. The W55RFS27R3C stops toggling while data is being received and
resumes again afterwards. This is called frequency hopping, and it is available in manual-mode.
Frequency hopping is enabled and disabled by the F2 pin, whose value is trapped during power-on. In
uC-mode, toggling is controlled manually using HOP_CLK (R pin, pin 23), and it is effectively disabled
by fixing the value of HOP_CLK at either “0” or “1”.
RF Receiver
The W55RFS27R3C has been implemented using an enhanced "Super-Regenerative" receiving
architecture. The resulting high sensitivity and high noise immunity is suitable for getting higher RF
receiving performance in very noisy environments. In addition, the on-chip LNA provides isolation from
other receivers, which is important in multi-player applications.
Power Regulator
The W55RFS27R3C built-in power regulator provides stable operating performance for operating
voltages from 2.2 to 5.5 V, a very wide range of voltages suitable for 2- or 3-battery R/C toys or R/C
vehicles.
Baseband Control Function Decoder
The W55RFS27R3C has a built-in, 6-function baseband control function decoder for R/C toys. The six
functions include Forward; Backward; Left-turn; Right-turn, and two user-defined functions F1 and F2.
Publication Release Date: May 31, 2005
-7-
Revision A1