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HTRM800 Datasheet(PDF) 8 Page - NXP Semiconductors |
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HTRM800 Datasheet(HTML) 8 Page - NXP Semiconductors |
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8 / 20 page  2001 Oct 04 8 Philips Semiconductors Product specification HITAG long range reader module hardware HTRM800 family 7.4 Postal approval The postal approval can only be granted for final products, not just for components like the HTRM800. But this reader module is designed in a way that it is possible to get the postal approval for a system including the HTRM800. Electromagnetic emissions comply with the guidelines in FTZ 17 TR 2100, ETS 300 330 and ETS 300 683. Electromagnetic immunity complies with the guidelines in ETS 300 683. The following configuration is in compliance with the European telecommunication standards: • Reader module HTRM800 • Power supply according to the recommendations (transformer type) • Antenna: 50 × 70 cm, number of turns N = 26 and inductivity L = 1.2 mH. A survey of the passed measurements is given in Table 1. Table 1 Survey of measurements ITEM MEASUREMENT STANDARD REQUIREMENTS EMI electromagnetic emission ETS 300 330, Sep 1994 FTZ 17 TR 2100 RFI emission limit class EN 55022, 1987 Immunity RF electromagnetic field ENV 50140 80 to 1000 MHz: 3 V/m, AM 80%, 1 kHz electrostatic discharge IEC 801-2, 1991 contact discharge: 4 kV; air discharge: 8 kV electrical fast transient (burst) IEC 801-4, 1988 signal ports: 0.5 kV; DC power ports: 1 kV; AC power ports 2 kV RF common mode ENV 50141 current clamp injection 150 kHz to 80 MHz: 3 V (rms), AM 80%, 1 kHz voltage dips and interruptions IEC 1000-4-11 reduction of 30% of UN for 10 ms, of 60% of UN for 100 ms, voltage interruption for 5 s surges, common and differential mode IEC 1000-4-5 AC power input ports: 1 kV (lines-to-ground), 0.5 V (line-to-line) 7.5 Operating security The following mechanisms ensure the operation security of the HITAG system: • Anticollission mode • Monitoring the supply voltage • Antenna rupture and short circuit. 7.5.1 ANTICOLLISION MODE Anticollision mode in long range applications permits you to process several HITAG 1 transponders simultaneously. Theoretically up to 232 HITAG 1 transponders can be processed simultaneously. In practice this number is limited, because of the mutual influence of the transponders. They detune each other, if there are too many too close to each other. In long range applications using HITAG 2 transponders, only one transponder is handled even if there are several transponders within the communication field of the antenna. In this case either no communication takes place or the ‘stronger’ or closer transponder takes over. By muting a selected transponder (HALT mode) another transponder that is to be found in the communication field of the antenna can be recognized. 7.5.2 MONITORING THE SUPPLY VOLTAGE The supply voltage is controlled by a watch dog circuit which triggers a system reset if the supply voltage of the core module drops below 4.75 V or if the microcontroller fails. 7.5.3 ANTENNA RUPTURE AND ANTENNA SHORT-CIRCUIT The HTRM800 does not get permanently damaged in case of an antenna rupture or a brief antenna short-circuit. The detection of detuned or broken antennas (antenna malfunction) is possible. |
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