W55RFS27T1B Datasheet, PDF (11/17 Pages) Winbond – SUPER-REGENERATION RF TRANSMITTER

W55RFS27T1B
4.1.2 Application Circuit for 6 Control Functions
Set TEST = 0.
1. Use this circuit when F1 and F2 are required (i.e., when more than 4 functions are required).
2. When a 9-V battery is used, an external power switch is required to save power.
3. LEDs require extra components.
VSPLY
TXOUT
TXOUT
SW1
Forward
SW3
Left turn
S1
R3 1K
S2
R4 1K
Input Protection
SW2
Backward
SW4
Right turn
300
LED
R5
LED1
100u
C0
1N4148
D1
1N4148
D2
S1
S2
LED control circuit
SW5 F1
SW6 F2
CKSEL0
CKSEL1
VDD
VDD
C18 +
10u
U1
1 _S3
S2 ¹⁶
2 _S4
S1 ¹⁵
3
CKSEL0
14
TXOUT
4 _TEST
ID0 ¹³
5
CKSEL1
12
ID1
6 _ANT
X2 ¹¹
7
VSS
10
X1
8 _VDD
RESET ⁹
W55RFS27T3B
C19
47n
S2
S1
TXOUT
ID0
ID1
C8 7p
49.86MHz
R1
Overtone Crystal
20K
ANTENNA
L1
39nH
L2
C13 47n
1uH
Dependent on Antenna
C7
240p
JP3
1
2
Power In
VDD
BT1
BAT
JP6
1
2
3
ID0
VDD
ID0
JP7
1
2
3
ID1
VDD
ID1
L7
1uH
C9
7p
C33
47n
* 27MHz,(L1,C7)= (56nH, 470pF), (L7,C33)=none
* 35MHz,(L1,C7)= (47nH, 360pF), (L7,C33)=(3.3uH,47n)
* 40MHz,(L1,C7)= (47nH, 300pF), (L7,C33)=(2.2uH,47n)
* 49MHz,(L1,C7)= (39nH, 240pF), (L7,C33)=(1uH,47n)
CKSEL0
VDD
CKSEL1
For 49MHZ
Title
W55RFS27T3B Application Circuit (49MHz)
Size Document Number
A
{Doc}
Rev
{RevCode}
Date:
Tuesday, July 06, 2004
Sheet
1
of 1
- 11 -
Publication Release Date:May 24, 2005
Revision A3