W55RFS27R3C
Super-Regeneration RF Receiver
W55RFS27R3C
Data Sheet
-1-
Publication Release Date: May 31, 2005
Revision A1
W55RFS27R3C
Table of Content-
1.
GENERAL DESCRIPTION ......................................................................................................... 3
1.1
1.2
W55RFS27R3C Features............................................................................................... 3
W55RFS27R3C Pad Definition....................................................................................... 4
1.2.1
1.2.2
W55RFS27R3C Pad Description..................................................................................4
Power-On Trapping Function Description.....................................................................5
2.
SYSTEM DESCRIPTION............................................................................................................ 6
2.1
2.2
W55RFS27R3C System Block Diagram ........................................................................ 6
W55RFS27R3C Functional Description ......................................................................... 7
W55RFS27R3C Absolute Maximum Ratings ................................................................. 8
W55RFS27R3C DC Characteristics ............................................................................... 8
W55RFS27R3C Ordering Information ............................................................................ 9
W55RFS27R3C Package Information ............................................................................ 9
3.4.1
3.4.2
W55RFS27R3C Bonding Pad List................................................................................9
W55RFS27R3C Bonding Pad Diagram ......................................................................10
3.
ELECTRONIC CHARACTERISTICS.......................................................................................... 8
3.1
3.2
3.3
3.4
4.
DESIGN INFORMATION .......................................................................................................... 11
4.1
W55RFS27R3C Reference Design .............................................................................. 11
4.1.1
W55RFS27R3C Application Circuit ............................................................................11
5.
REVISION HISTORY ................................................................................................................ 13
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W55RFS27R3C
1. GENERAL DESCRIPTION
The Winbond W55RFS27R3C is a fully integrated, S-R (Super-regeneration) RF receiver with full-
function baseband command decoder for R/C vehicles, toys, or wireless data communication
applications.
The W55RFS27R3C provides two input modes:
uC-mode,
for general-purpose, micro-controller
interfaces to the RF transmitter (the decoder is disabled); and
manual-mode,
for a 6-function,
baseband command decoder and RF receiver.
Manual-mode
is also designed with the Winbond-
patented
ChannelShared
WB
protocol for multi-player applications, and up to three players are allowed
simultaneously in the same frequency band. As a result, the W55RFS27T3B / W55RFS27R3C provide
a simple remote control capability for multiple players with low cost and high performance.
In addition, the W55RFS27R3C accommodates a wide range of operating voltages (2.2 ~ 5.5 V) and
supports 2- or 3-battery applications.
The associated transmitter W55RFS27T3B meets FCC/ETSI regulations for 27 MHz, 40 MHz, and 49
MHz S-R (Super-regeneration) demodulation.
1.1 W55RFS27R3C Features
Winbond patented
ChannelShared
WB
simultaneously in one frequency band.
protocol
enables
a
maximum
of
three
players
On-chip LNA provides better isolation so that receivers can work together without interference.
Enhanced receiver circuit provides higher sensitivity than traditional super-regenerative circuits.
Operating frequencies: 27 MHz to 49 MHz (depending on the oscillator frequency)
Operating voltages: 2.2 V ~ 5.5 V
(uC-mode) Receiving data rates up to 2.5 Kbps for 50% duty cycle signals
(manual-mode) R/C-toy baseband control command decoder, supporting 6 functions; Forward,
Backward, Left-turn, Right-turn, and 2 user-defined functions F1 and F2
(manual-mode) Frequency hopping increases receiver sensitivity
Power-down current consumption less than 1 µA
Associated transmitter W55RFS27T3B is compliant with FCC part 15 Subpart C 15.227 / ETSI 300
220-1 low-power and short-range device requirements
Operating temperature: 0°C ~ 70°C
-3-
Publication Release Date: May 31, 2005
Revision A1
W55RFS27R3C
1.2 W55RFS27R3C Pad Definition
1.2.1
W55RFS27R3C Pad Description
PAD NO.
I/O
A/D
FUNCTIONAL DESCRIPTION
SYMBOL
GND
CMFB
RBIAS
RSAW
VDDA
VDDA
GND_LNA
VDD_LNA
SDINGD
LNAING
LNAINS
LNAOUT
OSCin
OSCout
GNDA
Resetn
Mode
ID0
ID1
TEST
F1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
Ground
I/O
I/O
I/O
Power
Power
Ground
Power
Ground
I
I
O
O
O
O
I/O
I
I
I
I
I/O
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
D
D
D
D
D
D
Ground return path
Common-mode feedback capacitor connection
Resistor to adjust internal ring-oscillator frequency
Resistor to control internal saw generator
Regulated voltage output
Regulated voltage output
LNA Ground return path
LNA power input
Filter capacitor connection
LNA Gate input
LNA Source input
LNA output(NC)
Oscillator tank input
Oscillator tank output
Regulator ground return path
Resetn =0 reset whole circuit, internal pull-high
Receiver mode selection; should be “0” for regular
operation
ID setting(LSB) for Channel shared protocol
([ID1:ID0] = [1,1])
uC-mode
ID setting (MSB) for Channel shared protocol
([ID1:ID0] = [1,1])
uC-mode
TEST=1, reserved for chip testing, internal pull-low
(manual-mode) Decoder F1 output
(uC-mode) Set to “0”.
(manual-mode) Decoder F2 output
(manual-mode) Power on trapping of Frequency
Hopping
(uC-mode) $ENB (“0” to power down)
F2
22
I/O
D
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W55RFS27R3C
W55RFS27R3C Pad Description, continued.
SYMBOL
PAD NO.
I/O
A/D
FUNCTIONAL DESCRIPTION
(manual-mode) Decoder Right-turn output
R
23
I/O
D
(uC-mode) HOP_CLK (toggle every 20 ms for better
performance or fix at “0” or “1”)
(manual-mode) Decoder Left-turn output
(uC-mode) Set to “0”.
(manual-mode) Decoder Backward output
(uC-mode) Set to “1”.
(manual-mode) Decoder Forward output
(uC-mode) Set to “0”.
Receiver data output / Power on trapping of LNA
Power input
L
B
F
RXD
VSPLY
24
25
26
27
28
I/O
I/O
I/O
I/O
Power
D
D
D
D
A
1.2.2
Power-On Trapping Function Description
TRAPPING
STATE
FUNCTION DESCRIPTION
RECOMMENDED
USAGE
POWER-
TRAPPING PIN
NAME
1
RXD
0
1
F1*
0
1
F2
0
Enable LNA
Disable LNA
Not Used
Not Used
Enable Frequency Hopping
Disable Frequency Hopping
Enable Frequency
Hopping
Disable (Set to “0”)
Enable LNA
* Note:
Currently, F1 does not support any functions, but it should be set to “0” when the W55RFS27R3C is powered on.
-5-
Publication Release Date: May 31, 2005
Revision A1
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