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SRI2K 数据表(PDF) 38 Page - STMicroelectronics |
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SRI2K 数据表(HTML) 38 Page - STMicroelectronics |
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38 / 45 page ![]() DC and ac parameters SRI2K 38/45 Doc ID 15779 Rev 3 10 DC and ac parameters Table 7. Operating conditions Symbol Parameter Min. Max. Unit TA Ambient operating temperature –20 85 °C Table 8. DC characteristics Symbol Parameter Condition Min Typ Max Unit VCC Regulated voltage 2.5 3.5 V ICC Supply current (active in read) VCC = 3.0 V 100 µA ICC Supply current (active in write) VCC = 3.0 V 250 µA VRET Retromodulation induced voltage ISO 10373-6 20 mV CTUN Internal tuning capacitor 13.56 MHz 64 pF Table 9. AC characteristics(1) 1. All timing measurements were performed on a reference antenna with the following characteristics: External size: 75 mm x 48 mm Number of turns: 3 Width of conductor: 1 mm Space between 2 conductors: 0.4 mm Value of the coil: 1.4 µH Tuning Frequency: 14.4 MHz. Symbol Parameter Condition Min Max Unit fCC External RF signal frequency 13.553 13.567 MHz MICARRIER Carrier modulation index MI=(A-B)/(A+B) 8 14 % tRFR,tRFF 10% Rise and Fall times 0.8 2.5 µs tRFSBL Minimum pulse width for Start bit ETU = 128/fCC 9.44 µs tJIT ASK modulation data jitter Coupler to SRI2K –2 +2 µs tMIN CD Minimum time from carrier generation to first data 5ms fS Subcarrier frequency fCC/16 847.5 kHz t0 Antenna reversal delay 128/fS 151 µs t1 Synchronization delay 128/fS 151 µs t2 Answer to new request delay 14 ETU 132 µs tDR Time between request characters Coupler to SRI2K 0 57 µs tDA Time between answer characters SRI2K to coupler 0 µs tW Programming time for write With no auto-erase cycle (OTP) 3ms With auto-erase cycle (EEPROM) 5ms Binary counter decrement 7 ms |
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