Product data

MFRC631 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2014. All rights reserved.
Product data sheet
COMPANY PUBLIC
Rev. 3.3 — 4 February 2014
227433 96 of 120
NXP Semiconductors
MFRC631
High performance ISO/IEC 14443 A/B reader solution
9.14.3 LPCD_IMin
9.14.4 LPCD_Result_I
9.14.5 LPCD_Result_Q
Table 174. LPCD_QMax bits
Bit Symbol Description
7 LPCD_IMax.3 Defines the bit 3 of the high border for the LPCD. If the measurement
value of the I channel is higher than LPCD IMax, a LPCD IRQ is
raised.
6 LPCD_IMax.2 Defines the bit 2 of the high border for the LPCD. If the measurement
value of the I channel is higher than LPCD IMax, a LPCD IRQ is
raised.
5 to 0 LPCD_QMax Defines the high border for the LPCD. If the measurement value of
the Q channel is higher than LPCD QMax, a LPCD IRQ is raised.
Table 175. LPCD_IMin register (address 41h)
Bit 7 6 5 4 3 2 1 0
Symbol LPCD_IMax.1 LPCD_IMax.0 LPCD_IMin
Access
rights
r/w r/w r/w
Table 176. LPCD_IMin bits
Bit Symbol Description
7 to 6 LPCD_IMax Defines lowest two bits of the higher border for the low-power card
detection (LPCD). If the measurement value of the I channel is higher
than LPCD IMax, a LPCD IRQ is raised.
5 to 0 LPCD_IMin Defines the lower border for the ow power card detection. If the
measurement value of the I channel is lower than LPCD IMin, a LPCD
IRQ is raised.
Table 177. LPCD_Result_I register (address 42h)
Bit 7 6 5 4 3 2 1 0
Symbol RFU- RFU- LPCD_Result_I
Access
rights
-- r
Table 178. LPCD_I_Result bits
Bit Symbol Description
7 to 6 RFU -
5 to 0 LPCD_Result_I Shows the result of the last low-power card detection (I-Channel).
Table 179. LPCD_Result_Q register (address 43h)
Bit 7 6 5 4 3 2 1 0
Symbol RFU LPCD_Irq_Clr LPCD_Reslult_Q
Access
rights
r/w r