HTRC11001T/03EE,11 NXP Semiconductors, HTRC11001T/03EE,11 Datasheet - Page 6

• Manufacturer Part Number: HTRC11001T/03EE,11
• Description: IC RFID HITAG READER 14-SOIC
• Manufacturer: NXP Semiconductors
• Series: HITAG® 1r

Specifications of HTRC11001T/03EE,11

• Rf Type: Read Only
• Frequency: 125kHz
• Features: ISO11785, ISO14223
• Package / Case: 14-SOIC (0.154", 3.90mm Width)
• Product: RFID Readers
• Operating Temperature Range: - 40 C to + 85 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 568-2207-2; 935260092118; HTRC11001TD-T

Philips Semiconductors
8
8.1
The HTRC11001T works with an external 5 V 10% power
supply at pin V
10 mA +
For optimum performance, the power supply connection
should be bypassed to ground with a 100 nF capacitor
close to the chip.
8.2
The drivers deliver a square shaped voltage to the series
resonant antenna circuit (see Fig.4). Due to the full bridge
configuration of the drivers the output voltage V
approximately 10 V, corresponding to V
The current flowing through the antenna is sine shaped
and the peak and RMS values are approximately:
8.3
In order to detect an antenna short-circuit or open-circuit
the antenna tap voltage is monitored.
An antenna fail condition is reported in the status
bit ANTFAIL (see Table 5) if the antenna tap voltage does
not go more negative than the diagnosis level voltage
(V
driver cycle.
8.4
The crystal oscillator at pins XTAL1 and XTAL2 works with
either crystal or ceramic resonators. It delivers the input
clock frequency of 4, 8, 12 or 16 MHz. The oscillator
frequency is divided by a programmable divider (selection
bits FSEL1 and FSEL0) to obtain the carrier frequency of
125 kHz (see Table 3).
Alternatively, an external clock signal (CMOS compatible)
may connected to pin XTAL1. For example, this clock
signal can be derived from the microcontroller clock.
2001 Nov 23
I
I
ant(p)
ant(rms)
diag
HITAG reader chip
FUNCTIONAL DESCRIPTION
= 1.15 V). This condition is checked for every coil
=
Power supply
Antenna drivers
Diagnosis
Oscillator with programmable divider
=
4
-- -
2
-- -
------ -
1
2
V
--------------- -
R
I
ant(p)
ant(p)
DD
ant
I
ant(p)
. The maximum DC current is
= 137 mA.
ant(p)
= 5 V.
ant(p-p)
is
6
8.5
The demodulator senses the absorption modulation
applied by a transponder when inserted into the field. The
signal is picked up at the antenna tap point between
L
to a level on pin RX below 8 V (peak value) with respect to
pin QGND (see Fig.4). Internally the signal is filtered with
a second-order low-pass filter.
The antenna current and therefore the tap voltage is
modulated by the transponder in amplitude and/or phase.
This signal is fed into a synchronous demodulator
recovering the baseband signal. The amplification and the
bandpass filter edge frequencies of the demodulator can
be adapted to different transponders via settings in the
configuration pages (see Table 3).
The phase between the driver excitation signal and the
antenna tap voltage depends on the antenna tuning. With
optimum tuning, the phase of the antenna tap voltage is
90 off the antenna driver signal. Detuning of the antenna
resonant circuit results in a change of this phase
relationship. The built-in phase measurement unit allows
the measurement of this phase relationship with a
resolution of
compute a sampling time that compensates the detuning
of the reader antenna.
The phase measurement procedure can be carried out:
Before the system is switched into WRITE_TAG mode, the
demodulator has to be frozen. This is internally done by
clamping the input of the filter amplifier unit to the level on
pin QGND. Doing so avoids large transients in the
amplifier and digitizer, which could affect settling times.
In addition to the clamping, there exist other means in the
HTRC11001T which allow further reduction of the settling
times. All the parts of the circuitry which are associated
with these functions are controlled by the bits FREEZE0,
FREEZE1 and THRESET (see Table 2).
For more details concerning write timing, demodulator
setting, power-up sequence, etc. please refer to the
application note “AN 98080 Read/Write devices based on
the HITAG Read/Write IC HTRC110” .
a
Once before the first communication starts, if the
position of the transponder does not change with
respect to the reader antenna
During the communication (after sending the write
pulses and before receiving the answer of the
transponder), if the tag is moving.
and C
Adaptive sampling time demodulator
a
. It is divided by R
----- -
64
1
360
=
5.625
v
and the internal resistor R
. This can be used to
HTRC11001T
Product specification
int