2002 May 24

8

Philips Semiconductors

Product specification

I-CODE Long range reader

module hardware

SLRM900

Table 1

DC power supply output voltage

Table 2

DC power supply ripple voltage

7.2

Reader software

The available software for the SLRM900 is contained in

document

"SLRM900 I-CODE Long Range Reader

Module, protocol Reader-Host".

7.3

Reader hardware

The internal electronics of the SLRM900 can be divided in

two major units:

• RF board (see Fig.7)

• Microcontroller board (see Fig.8).

7.3.1

7.3.1.1

Voltage regulation

All necessary internal voltages for the module are derived

internally from the 24 V DC power supply voltage.

7.3.1.2

Clock generator

This part generates the 13.56 MHz clock frequency for the

transmitter amplifier. A divided clock signal is connected to

the microcontroller for synchronization purposes.

7.3.1.3

Modulator and transmitter amplifier

To transmit data to the I-CODE labels, the carrier has to be

modulated by the modulator with a digital signal from the

microcontroller according to data sheet

"SL1ICS3001

I-CODE Label IC, protocol air interface". The transmitter

amplifier amplifies the modulated carrier signal.

7.3.1.4

Modulation index and RF power regulation

The RF power regulator keeps the antenna output voltage

to a level determined by software settings. Also, by using

software settings, the modulation index can be set,

according to data sheet

"SL1ICS3001 I-CODE Label IC".

The required modulation index has to be re-adjusted after

any change of the RF output power and at large

temperature variations.

7.3.1.5

Receiver, filter, demodulator, and ADC

An amplitude modulated signal is received from the

I-CODE1 label IC. After filtering, demodulation, and

amplification, the analog data signal is converted by the

12-bit ADC for further digital processing.

7.3.1.6

Opto-couplers

All internal analog and digital signals between the

RF board and microcontroller board are galvanically

separated by opto-couplers.

7.3.2

7.3.2.1

Microcontroller

The microcontroller processes the protocol for the

communication between the I-CODE labels and the

SLRM900. The serial interface signals are converted in

such a way, that the labels are able to process them, and

the outgoing signals from the labels are converted into

serial interface-compatible signals.

Another important microcontroller task is its control

function. Software control offers the possibility to change

both the RF-output power and the modulation index.

7.3.2.2

RS232 interface

The device communicates with the host (processor or PC)

via a serial interface, using a jumper-selectable baud rate

of either 57.6 kbaud in standard mode, or 115.2 kbaud in

fast mode (see setting for JP4 in Table 3).

OUTPUT PARAMETER

VALUE

DC supply voltage

+24 V

DC current

2 A

RIPPLE FREQUENCY

MAXIMUM

RIPPLE VOLTAGE

50 Hz

≤ f < 10 MHz

100 mV (p-p)

10 MHz

≤ f < 20 MHz

50 mV (p-p)

f

≥ 20 MHz

100 mV (p-p)