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MCRF250 Arkusz danych(PDF) 9 Page - Microchip Technology |
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MCRF250 Arkusz danych(HTML) 9 Page - Microchip Technology |
9 / 24 page 2003 Microchip Technology Inc. DS21267F-page 9 MCRF250 4.0 CONTACTLESS PROGRAMMING The contactless programming of the device is possible for a blank device (CB12 = 0) only, and is recommended for only low-volume, manual operation during development. In volume production, the MCRF250 is normally used as a factory programmed device only. The contactless programming timing sequence consists of: a) RF Power-up signal. b) Short gap (absence of RF field). c) Verify signal (continuous RF signal). d) Programming signal. e) Device response with programmed data. The blank device (CB12 = 0) understands the RF power-up followed by a gap as a blank checking command, and outputs 128 bits of FSK data with all ‘1’s after the short gap. To see this blank data (verify), the reader/programmer must provide a continuous RF signal for 128 bit-time. (The blank (unprogrammed) device has all ‘F’s in its memory array. Therefore, the blank data should be all ‘1’s in FSK format). Since the blank device operates at Default mode (MOD128), there are 128 RF cycles for each bit. Therefore, the time requirement to complete this verify is 128 bits x 128 RF cycles/bit x 8 use/cycles = 131.1 msec for 125 kHz signal. As soon as the device completes the verify, it enters the programming mode. The reader/programmer must provide RF programming data right after the verify. In this programming mode, each bit lasts for 128 RF cycles. Refer to Figure 4-1 for the contactless programming sequence. Customer must provide the following specific voltage for the programming: 1. Power-up and verify signal = 13.5 VPP ±1 VPP 2. Programming voltage: - To program bit to ‘1’: 13.5 VPP ±1 VPP - To program bit to ‘0’: 30 VPP ±2 VPP After the programming cycle, the device outputs programmed data (response). The reader/programmer can send the programming data repeatedly after the device response until the programming is successfully completed. The device locks the CB12 as soon as the programming mode (out of field) is exited and becomes a read-only device. Once the device is programmed (CB12 = 1), the device outputs its data according to the configuration register. The PG103001 (Contactless Programmer) is used for the programming of the device. The voltage level shown in Figure 4-1 is adjusted by R5 and R7 in the contactless programmer. Refer to the MicroID™ 125 kHz RFID System Design Guide (DS51115) for more information. |
Podobny numer części - MCRF250 |
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Podobny opis - MCRF250 |
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