MC33690 Datasheet, PDF (20/24 Pages) Motorola, Inc – Standalone Tag Reader Circuit

Freescale S^Me^Cm³³i⁶c⁹o⁰nductor, Inc.
Figure 15 : Direct connection to a microcontroller
VBAT
C₁
NC
GATE
To microcontroller
power supply pin
NC
SOURCE
VSS
C₂
C_{3 VDD}
10uF 100nF
R_A^VSS
L_A
R₁
TD1
C_A
R₂
RD
VSUP
STARC
LVR
XTAL1
XTAL2 ^1MΩ
VDD
MODE1
TD2
MODE2
CEXT
C_{EXT 10nF}
AGND
DOUT
AM
To microcontroller
port/reset pin
8.2pF
8MHz
8.2pF
To microcontroller
port
VBAT
510Ω
To microcontroller
port
Tx
K
Rx
If no external MOS transistor is necessary to increase the voltage regulator current capability, the pins GATE
and SOURCE must be left unconnected.
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: www²⁰.freescale.com
revision 4.8, 5 February 2002