MC33690 Datasheet, PDF (18/24 Pages) Motorola, Inc – Standalone Tag Reader Circuit

Freescale S^Me^Cm³³i⁶c⁹o⁰nductor, Inc.
APPLICATION SCHEMES
VBAT
VSS
L_A
C_A
Figure 13 : Standalone configuration with one wire bus
C₁
NC
GATE
NC
SOURCE
C₂
C_{3 VDD}
10µF 100nF
R_A ^VSS
TD1
R₁
R₂
RD
TD2
C_EXT
CEXT
10nF
AGND
VSUP
STARC
NC
LVR
8.2pF
XTAL1
8MHz
XTAL2 ^1MΩ _8.2pF
MODE1
MODE2
NC
DOUT _VSUP
VBAT
AM
510Ω
Tx
K
NC
Rx
If no external MOS transistor is necessary to increase the voltage regulator current capability, the pins GATE
and SOURCE must be left unconnected.
In this configuration, the outputs Rx and DOUT force a low level.
C₁ is not required for the STARC functionality and only acts as a reservoir of energy.
To preserve the demodulator sensitivity, C_EXT and R₂ should be connected to AGND, and VSS connected to
AGND using a low resistance path.
© Motorola, Inc., 2002.
F^Mo^Or ^TM^Oo^Rr^Oe^LAIn^Sfo^EMrm^ICa^Ot^Nio^Dn^UCO^Tn^ORT^Sh^Pis^ROP^Dro^Ud^Cu^TSct,
Go to: www¹⁸.freescale.com
revision 4.8, 5 February 2002