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MC33690DWE

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26
MC33690 Standalone Tag Reader Circuit, Rev. 5
Freescale Semiconductor4
Table 1. Maximum Ratings
Rating Symbol Value Unit
Supply voltage V
SUP
V
SS
−0.3 to +40 V
Supply voltage without using the voltage regulator
(V
SUP
=V
DD
)
V
DD
V
SS
−0.3 to +7V
Voltage on SOURCE — V
SS
−0.3 to +40 V
Current into/from GATE — 0 mA
Voltage on GATE — V
SS
−0.3 V
Voltage on pins:
MODE1/2, CEXT, DOUT, LVR, XTAL1/2, Rx, Tx
—V
SS
−0.3 to V
DD
+0.3 V
Voltage on RD — ±10 V
Voltage on K and AM — V
SS
−3 to 40 V
Current on TD1 and TD2
(Drivers on and off)
— ±300 mA
Voltage on AGND — V
SS
±0.3 V
ESD voltage capability
1
— ±2000 V
ESD voltage capability
1
— ±200 V
Solder heat resistance test (10s) — 260 °C
Junction temperature T
J
170 °C
Storage temperature T
s
−65 to +150 °C
1
Human Body Model, AEC-Q100-002 Rev. C; Machine Model, AEC-Q100-003 Rev. E.
Table 2. Thermal Characteristics
Characteristic Symbol Value Unit
Junction to ambient thermal resistance (SOIC20) R
th
80 °C/W
Table 3. Pin Function Descriptions
Pin Function
Description
1 VSUP Power supply
2 SOURCE External N channel transistor source
3 GATE External N channel transistor gate
4 TD1 Antenna driver 1 output
5 VSS Power and digital ground
6 VDD Voltage regulator output
7 TD2 Antenna driver 2 output
8 MODE1 Mode selection input 1
9 MODE2 Mode selection input 2
10 RD Demodulator input
Description
MC33690 Standalone Tag Reader Circuit, Rev. 5
Freescale Semiconductor 5
1 Description
1.1 Tag Reader Module
The tag reader module is dedicated for automotive or industrial applications where information has to be transmitted
contactless.The tag reader module is a write/read (challenge/response) controller for applications that a demand high security
level.
The tag reader module is connected to a serial-tuned LC circuit that generates a magnetic field power supplying the tag. The
use of a synchronous sample and hold technique allows communication with all available tags using admittance switching
producing absorption of the RF field.
Load amplitude or phase shift modulation can be detected at high bit rates up to 8 kHz. The typical operational carrier frequency
of the tag reader module with an 8 MHz clock is 125 kHz.
11 AGND Demodulator ground
12 CEXT Comparator reference input
13 DOUT Demodulator output (5V)
14 LVR Low Voltage Reset input/output
15 XTAL2 Oscillator output
16 XTAL1 Oscillator input
17 AM Amplitude modulation input
18 K ISO 9141 transmitter output and receiver input
19 Rx ISO 9141 receiver monitor output
20 Tx ISO 9141 transmitter input
Table 3. Pin Function Descriptions (continued)
MC33690 Standalone Tag Reader Circuit, Rev. 5
Read Function
Freescale Semiconductor6
Figure 2. Tag Reader Block Diagram
2 Read Function
When answering to the base station, a transponder generates an absorption modulation of the magnetic field. It results in an
amplitude/phase modulation of the current across the antenna. This information is picked up at the antenna tap point between
the coil and the capacitor. An external resistive ladder down scales this voltage to a level compatible with the demodulator input
voltage range (see Section 15, “Tag Reader”).
The demodulator (see Figure 2) consists of:
• an input stage (emitter follower)
• a sample and hold circuit
• a voltage follower
• a low offset voltage comparator
The sampling time is automatically set to take into account a phase shift due to the tolerances of the antenna components (L and
C) and of the oscillator. The allowed phase shift measured at the input RD ranges from −45° to +45°. Assuming that the phase
D
C
Q
+
-
1/32 counter 1/2
RD
CEXT
AGND
Buffer
VDD
500ns
S/H Buffer
Comparator
100KW
8MHz
Clock 8 MHz
Data out
Interface
125 kHz
TD2
11.25°, 22.5°, 33.75°, 45°, 56.25°, 67.5°, 78.75°, 90°
AM Data
+
-
4MHz
125 kHz
LVR
Shutdown
TD1
10nF
+0°, -11.25°, -22.5°, -33.75°, -45°, -56.25°, -67.5°, -78.75°
C
A
L
A
R
1
R
2
C
EXT
R
A
VDD
+
-
Setup and Preload
Self synchronous
sample and hold
500mA
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26

MC33690DWE

Mfr. #:
Buy MC33690DWE
Manufacturer:
NXP / Freescale
Description:
Digital Signal Processors & Controllers - DSP, DSC STAND ALONE TAG READER
Lifecycle:
New from this manufacturer.
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