SLRM900 Datasheet, PDF (8/16 Pages) NXP Semiconductors – I-CODE Long range reader module hardware

Philips Semiconductors
I-CODE Long range reader
module hardware
Product specification
SLRM900
Table 1 DC power supply output voltage
OUTPUT PARAMETER
DC supply voltage
DC current
+24 V
2A
VALUE
Table 2 DC power supply ripple voltage
RIPPLE FREQUENCY
50 Hz ≤ f < 10 MHz
10 MHz ≤ f < 20 MHz
f ≥ 20 MHz
MAXIMUM
RIPPLE VOLTAGE
100 mV (p-p)
50 mV (p-p)
100 mV (p-p)
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 RF BOARD
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 MICROCONTROLLER BOARD
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).
2002 May 24
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