W55RFS27T3B Datasheet, PDF (2/16 Pages) Winbond – SUPER-REGENERATION RF RECEIVER

W55RFS27T3B
1. GENERAL DESCRIPTION
The Winbond W55RFS27T3B is a fully-integrated, S-R (Super-regeneration) RF transmitter with full-
function baseband command encoder and a Winbond-patented, channel-sharing algorithm that
supports up to three players simultaneously. As such, the W55RFS27T3B is suitable for R/C vehicles,
toys, or wireless data communication applications.
The W55RFS27T3B provides two input modes: uC-mode, for general-purpose, micro-controller
interfaces with the RF transmitter; and manual-mode, for a 3-player, 6-function, baseband command
encoder and RF transmitter. In manual-mode, the W55RFS27T3B works conveniently with up to
three W55RFS27R3C chips to provide a simple, multi-player remote control capability with low cost
and high performance.
The S-R RF transmitter operates on 27 MHz, 35 MHz, 40 MHz, or 49 MHz with a default data rate of
2.5 KBPS, and it is compliant with FCC part 15 Subpart C 15.227(15.235) and ETSI 300 220-1,
making it easier for wireless end products to get FCC and ETSI compliance approval.
In addition, the W55RFS27T3B accommodates a wide range of operating voltages (2.2 V to 5.5 V),
supports 2- or 3-battery R/C toy applications, and generates highly-efficient transmissions.
1.1 Features
• Operating frequency: 27 MHz ~ 49 MHz
• Wide operating voltage: 2.2 V ~ 5.5 V
• Two input modes—uC-mode and manual-mode—for more flexibility
• (uC-mode) Transmission data rate up to 10 Kbps for 30%-70% duty cycle signals
• (manual-mode) Winbond-patented, channel-sharing algorithm that allows up to 3 players
simultaneously on the same frequency band
• (manual-mode) R/C toy baseband control command encoder, supporting 4 or 6 functions: Forward,
Backward, Left-turn, Right-turn, and 2 user-defined functions F1 and F2 (user-defined functions
not available in 4-function mode)
• 15-dBm, high-efficiency transmissions (50 Ω) with minimum current consumption
• Power-down current consumption less than 1 uA
• Fewer external components required
• Compliant with FCC part 15 Subpart C 15.227(15.235) / ETSI 300 220-1 low-power and short-
range device requirements
• Operating temperature: 0°C ~ 70°C
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