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MFRC522 bảng dữ liệu(PDF) 60 Page - NXP Semiconductors |
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MFRC522 bảng dữ liệu(HTML) 60 Page - NXP Semiconductors |
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60 / 109 page  112132 © NXP B.V. 2007. All rights reserved. Product data sheet Rev. 3.2 — 22 May 2007 60 of 109 NXP Semiconductors MFRC522 Contactless Reader IC 10.4.12 Switching from F/S to HS mode and Vice Versa After reset and initialization, the MFRC522 is in Fast mode (which is in effect F/S mode as Fast mode is downward compatible to Standard mode). The connected MFRC522 recognizes the “S 00001XXX A” sequence and switches its internal circuitry from the Fast mode setting to the HS mode setting. Following actions are taken: 1. Adapt the SDA and SCL input filters according to the spike suppression requirement in HS mode. 2. Adapt the slope control of the SDA output stages. For system configurations, where no other I2C devices are involved in the communication, have an additional possibility to switch to HS-mode. By setting the bit I2CForceHS in register Status2Reg to logic 1, the HS mode is entered. Setting this bit to logic 1 changes the HS-mode permanent meaning that sending the master code is no longer necessary. This is not according the specification and should only be used when no other devices are connected on the bus. Spikes on the I2C lines shall be avoided because of the reduced spike suppression. 10.4.13 MFRC522 at Lower Speed modes MFRC522 is fully downwards compatible, and can be connected to an F/S mode I2C-bus system. As no master code will be transmitted in such a configuration, the device stays in F/S mode and communicates at F/S mode speeds. |
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