CR14-MQP/1GE STMicroelectronics, CR14-MQP/1GE Datasheet - Page 9

• Manufacturer Part Number: CR14-MQP/1GE
• Description: IC TYPE-B CHIP I2C ECO 16-SOIC N
• Manufacturer: STMicroelectronics

Specifications of CR14-MQP/1GE

• Rf Type: Transceiver
• Frequency: 13.56MHz
• Features: ISO14443-B
• Package / Case: 16-SOIC (0.154", 3.90mm Width)
• Pin Count: 16
• Screening Level: Commercial
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-5719-1; 497-5719-1; 497-5719-5

CR14
2
2.1
2.2
2.3
2.4
2.5
Signal description
See
connected to this device.
Oscillator (OSC1, OSC2)
The OSC1 and OSC2 pins are internally connected to the on-chip oscillator circuit. The
OSC1 pin is the input pin, the OSC2 is the output pin. For correct operation of the CR14, it is
required to connect a 13.56MHz quartz crystal across OSC1 and OSC2. If an external clock
is used, it must be connected to OSC1 and OSC2 must be left open.
Antenna output driver (RF
The Antenna Output Driver pin, RF
antenna. Care must be taken as it will not withstand a short-circuit.
RF
schematic
Antenna input filter (RF
The antenna input filter of the CR14, RF
through an adapter circuit, as shown in
The input filter demodulates the signal generated on the antenna by the load variation of the
PICC. The resulting signal is then decoded by the 847kHz BPSK decoder.
Transmitter reference voltage (V
The Transmitter Reference Voltage input, V
output driver for ASK modulation.
The Transmitter Reference Voltage input should be connected to an external capacitor, as
shown in
Serial clock (SCL)
The SCL input pin is used to strobe all I²C data in and out of the CR14. In applications
where this line is used by slave devices to synchronize the bus to a slower clock, the master
must have an open drain output, and a pull-up resistor must be connected from the Serial
Clock (SCL) to V
calculated).
In most applications, though, this method of synchronization is not employed, and so the
pull-up resistor is not necessary, provided that the master has a push-pull (rather than open
drain) output.
OUT
Figure 1: Logic
has to be connected to the antenna circuitry as shown in
Figure
The LRC antenna circuitry must be connected across the RF
4.
CC
.
diagram, and
(Figure 5
Doc ID 11922 Rev 2
indicates how the value of the pull-up resistor can be
Table 1: Signal
OUT
IN
)
, generates the modulated 13.56MHz signal on the
OUT
Figure
IN
, has to be connected to the external antenna
REF
)
, provides a reference voltage used by the
4.
REF
names, for an overview of the signals
)
Figure 4: CR14 application
OUT
Signal description
pin and GND.
9/47