HCS473 Datasheet, PDF (8/68 Pages) Microchip Technology – Code Hopping Encoder and Transponder

HCS473
FIGURE 2-1:
HCS473 3-AXIS
APPLICATION
VDD
1µF
100nF
HCS473
S0
VDD
S1
LED
S2 DATA
S3/RFEN VSS
VDDT VSST
LCX LCCOM
LCY LCZ
RF
Circuit
L_X
C_X L_Y
C_Y L_Z
C_Z
680pF
Note:
The 680pF capacitor prevents device instability - self
resonance.
FIGURE 2-2:
HCS473 1-AXIS
APPLICATION
VDD
1µF
100nF
HCS473
S0
VDD
S1
LED
S2 DATA
S3/RFEN VSS
VDDT VSST
LCX LCCOM
LCY LCZ
RF
Circuit
L_X
C_X
100Ω
100Ω
660 pF
Note:
Connect unused LC antenna inputs to LCCOM
through a 100Ω resistor for proper bias conditions.
FIGURE 2-3:
S0/S1/S2 PIN DIAGRAM
S0, S1, S2
Inputs
RPD
FIGURE 2-4:
S3/RFEN PIN DIAGRAM
VDD
PFET
RFEN
NFET
S3 Input/
RFEN Output
RPD
Note:
RPD is disabled when driving RFEN.
FIGURE 2-5:
DATA PIN DIAGRAM
VDD
PFET
DATA OUT
NFET
DATA
RDATA
Note:
RDATA is disabled when the DATA line is driven.
DS40035C-page 6
Preliminary
 2002 Microchip Technology Inc.