CRX14 datasheet(7/40 Pages) STMICROELECTRONICS

Part #	CRX14

Description	Low Cost ISO14443 type-B Contactless Coupler Chip with Anti-Collision, CRC Management and Anti-Clone Function

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CRX14

SIGNAL DESCRIPTION

See Figure 2., and Table 1., for an overview of the

signals connected to this device.

Oscillator (OSC1, OSC2). The OSC1 and OSC2

pins are internally connected to the on-chip oscil-

lator circuit. The OSC1 pin is the input pin, the

OSC2 is the output pin. For correct operation of

the CRX14, it is required to connect a 13.56MHz

quartz crystal across OSC1 and OSC2. If an exter-

nal clock is used, it must be connected to OSC1

and OSC2 must be left open.

Antenna Output Driver (RFOUT). The

Antenna

Output Driver pin, RFOUT, generates the modulat-

ed 13.56MHz signal on the antenna. Care must be

taken as it will not withstand a short-circuit.

RFOUT has to be connected to the antenna circuit-

ry as shown in Figure 5. The LRC antenna circuitry

must be connected across the RFOUT pin and

GND.

Antenna Input Filter (RFIN). The antenna input

filter of the CRX14, RFIN, has to be connected to

the external antenna through an adapter circuit, as

shown in Figure 5.

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 (VREF). The

Transmitter Reference Voltage input, VREF, pro-

vides a reference voltage used by the output driver

for ASK modulation.

The Transmitter Reference Voltage input should

be connected to an external capacitor, as shown in

Figure 5.

Serial Clock (SCL). The SCL input pin is used to

strobe all I²C data in and out of the CRX14. In ap-

plications where this line is used by slave devices

to synchronize the bus to a slower clock, the mas-

ter must have an open drain output, and a pull-up

resistor must be connected from the Serial Clock

(SCL) to VCC. ( Figure 6. indicates how the value

of the pull-up resistor can be calculated).

In most applications, though, this method of syn-

chronization 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.

Serial Data (SDA). The SDA signal is bi-direc-

tional. It is used to transfer I²C data in and out of

the CRX14. It is an open drain output that may be

wire-OR’ed with other open drain or open collector

signals on the bus. A pull-up resistor must be con-

nected from Serial data (SDA) to VCC. (Figure 6.

indicates how the value of the pull-up resistor can

be calculated).

Chip Enable (E0, E1, E2). The Chip Enable in-

puts E0, E1, E2 are used to set and reset the value

on the three least significant bits (b3, b2, b1) of the

7-bit I²C Device Select Code. They are used for

hardwired addressing, allowing up to eight CRX14

devices to be addressed on the same I²C bus.

These inputs may be driven dynamically or tied to

VCC or GND to establish the Device Select Code

(note that the VIL and VIH levels for the inputs are

CMOS compatible, not TTL compatible).

When left open, E0, E1 and E2 are internally read

at the logic level 0 due to the internal pull-down re-

sistors connected to each inputs.

Power Supply (VCC, GND, GND_RF). Power is

supplied to the CRX14 using the VCC, GND and

GND_RF pins.

VCC is the Power Supply pin that supplies the pow-

er (+5V) for all CRX14 operations.

The GND and GND_RF pins are ground connec-

tions. They must be connected together.

Decoupling capacitors should be connected be-

tween the VCC Supply Voltage pin, the GND

Ground pin and the GND_REF Ground pin to filter

the power line, as shown in Figure 5.

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