hcs473 Microchip Technology Inc., hcs473 Datasheet - Page 8

• Manufacturer Part Number: hcs473
• Description: Code Hopping Encoder And Transponder
• Manufacturer: Microchip Technology Inc.

HCS473
DS40035C-page 6
FIGURE 2-1:
FIGURE 2-2:
L
L
X
X
Note:
Note:
C
C
X
X
1µF
1µF
L
Y
Connect unused LC antenna inputs to LCCOM
through a 100Ω resistor for proper bias conditions.
The 680pF capacitor prevents device instability - self
resonance.
100Ω
660 pF
C
S0
S1
S2
S3/RFEN
V
LCX
LCY
S0
S1
S2
S3/RFEN
V
LCX
LCY
Y
DDT
DDT
HCS473
HCS473
V
V
L
DD
DD
Z
HCS473 3-AXIS
APPLICATION
HCS473 1-AXIS
APPLICATION
LCCOM
LCCOM
680pF
100nF
100nF
DATA
DATA
V
V
LED
LED
LCZ
V
LCZ
V
V
V
SST
SST
100Ω
DD
DD
SS
SS
C
Z
Circuit
Circuit
RF
RF
Preliminary
FIGURE 2-3:
FIGURE 2-4:
FIGURE 2-5:
S3 Input/
RFEN Output
Note:
S0, S1, S2
Inputs
Note:
DATA
R
RDATA is disabled when the DATA line is driven.
PD
is disabled when driving RFEN.
RDATA
S0/S1/S2 PIN DIAGRAM
S3/RFEN PIN DIAGRAM
DATA PIN DIAGRAM
 2002 Microchip Technology Inc.
R
PD
PFET
NFET
R
PFET
NFET
PD
V
V
DD
DD
DATA OUT
RFEN