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MFRC522 データシート(PDF) 80 Page - NXP Semiconductors |
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MFRC522 データシート(HTML) 80 Page - NXP Semiconductors |
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80 / 96 page  MFRC522_33 © NXP B.V. 2009. All rights reserved. Product data sheet PUBLIC Rev. 3 — 26 October 2009 112133 80 of 96 NXP Semiconductors MFRC522 Contactless reader IC 16.1.3 Test signals on pins AUX1 or AUX2 The MFRC522 allows the user to select internal signals for measurement on pins AUX1 or AUX2. These measurements can be helpful during the design-in phase to optimize the design or used for test purposes. Table 158 shows the signals that can be switched to pin AUX1 or AUX2 by setting AnalogSelAux1[3:0] or AnalogSelAux2[3:0] in the AnalogTestReg register. Remark: The DAC has a current output, therefore it is recommended that a 1 k Ω pull-down resistor is connected to pin AUX1 or AUX2. Table 156. Test bus signals: TestBusSel[4:0] = 07h Pins Internal signal name Description D6 s_data received data stream D5 s_coll bit-collision detected (106 kBd only) D4 s_valid s_data and s_coll signals are valid D3 s_over receiver has detected a stop condition D2 RCV_reset receiver is reset D1 - reserved Table 157. Test bus signals: TestBusSel[4:0] = 0Dh Pins Internal test signal name Description D6 clkstable oscillator output signal D5 clk27/8 oscillator output signal divided by 8 D4 to D3 - reserved D2 clk27 oscillator output signal D1 - reserved Table 158. Test signal descriptions AnalogSelAux1[3:0] or AnalogSelAux2[3:0] value Signal on pin AUX1 or pin AUX2 0000 3-state 0001 DAC: register TestDAC1 or TestDAC2 0010 DAC: test signal Corr1 0011 reserved 0100 DAC: test signal MinLevel 0101 DAC: test signal ADC_I 0110 DAC: test signal ADC_Q 0111 to 1001 reserved 1010 HIGH 1011 LOW 1100 TxActive |
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