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HTMS8301FUG/AM Datasheet(PDF) 10 Page - NXP Semiconductors |
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HTMS8301FUG/AM Datasheet(HTML) 10 Page - NXP Semiconductors |
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10 / 44 page ![]() 184430 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2010. All rights reserved. Product data sheet PUBLIC Rev. 3.0 — 18 March 2010 184430 10 of 44 NXP Semiconductors HITAG µ ISO 18000 transponder IC 10.1.2 Data rate and data coding The RWD to HITAG µ ISO 18000 transponder IC communication uses Pulse Interval Encoding. The RWD creates pulses by switching the carrier off as described in Figure 4. The time between the falling edges of the pulses determines either the value of the data bit ’0’, the data bit ’1’, a code violation or a stop condition. Assuming equal distributed data bits ’0’ and ’1’, the data rate is in the range of about 5.2 kbit/s. [1] TC...Carrier period time (1/125kHz = 8 μs nominal) Fig 4. Reader to HITAG µ ISO 18000 transponder IC: Pulse Interval Encoding Table 6. Data coding times [1] Meaning Symbol Min Max Carrier off time TF1 4 × Tc 10 × Tc Data “0” time TFd0 18 × Tc 22 × Tc Data “1” time TFd1 26 × Tc 30 × Tc Code violation time TFcv 34 × Tc 38 × Tc Stop condition time TFsc ≥ 42 × Tc n/a 001aaj827 carrier on TF1 carrier off TFsc "stop condition'' carrier on TF1 carrier off TF1 TFcv "code violation'' carrier on TF1 carrier off TF1 TFd1 data "1'' carrier on TF1 carrier off TF1 TFd0 data "0'' |
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