W55RFS27R1B Datasheet, PDF (13/15 Pages) Winbond – SUPER-REGENERATION RF RECEIVER

W55RFS27R1B
4.2 W55RFS27R1B Smart-Detector^WB Function
4.2.1 Introduction
The Smart-Detector^WB function is designed to
overcome the effects of component deviation
and environmental changes. It enables the on-
chip OAGC (Oscillator Auto-Gain-Control) and
hopping clock functions, dynamically searching
for the best operating conditions and
maintaining the highest sensitivity in different
environments.
In manual-mode, the control mechanism is
built in while, in uC-mode, the OAGC and
hopping functions are fixed or controlled by the
external
MCU.
4.2.2 Using Smart-Detector^WB in Manual-mode
a). Set [MODE1:MODE0] to [00] to disable Smart-Detector^WB. Then, select RSAW to provide the
highest sensitivity. Note the default values for OAGC and HOPCLK are OAGC[2:0] = {0,1,0} and
HOPCLK = 0.
b). Set [MODE1:MODE0] to [11] to enable Smart-Detector^WB. Then, OAGC[2:0] change according to
the following sequence, and HOPCLK toggles once (“0” => “1” or “1” => “0”) every T seconds.
start
T
T
T
(1,0,0) (1,0,0) (0,1,1)
(0,0,0) ^T (0,0,1) ^T (0,1,0) ^T
( T ~= 20ms)
c). When a data packet is received, the W55RFS27R1B holds the current OAGC and HOPCLK
settings for around 50ms. When there is no more data input, OAGC and HOPCLK resume sequencing
and toggling.
4.2.3 Using Smart-Detector^WB in uC-mode
In uC-mode, OAGC[2:0] and HOPCLK are externally controlled. They can be fixed at specific values
or changed to follow the sequence described in manual-mode. Winbond recommends using fixed
settings in uC-mode because it can be difficult for the MCU to control these pins.
When OAGC and HOPCLK are fixed, the corresponding pins should be set to OAGC[2:0] = (0,1,0)
and HOPCLK = 0. Component deviation should be controlled tightly for consistent results in mass-
produced applications.
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Publication Release Date:June 8, 2005
Revision A3