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 17 of 120
NXP Semiconductors
MFRC631
High performance ISO/IEC 14443 A/B reader solution
The selectable transfer speeds as shown are calculated according to the following
formulas:
if BR_T0 = 0: transfer speed = 27.12 MHz / (BR_T1 + 1)
if BR_T0 > 0: transfer speed = 27.12 MHz / (BR_T1 + 33)/2
(BR_T0  1)
Remark: Transfer speeds above 1228.8 kBits/s are not supported.
8.4.3.2 Framing
Remark: For data and address bytes the LSB bit has to be sent first. No parity bit is used
during transmission.
Read data: To read out data using the UART interface the flow described below has to be
used. The first send byte defines both the mode itself and the address.The Trigger on pin
IF3 has to be set, otherwise no read of data is possible.
Table 12. Settings of BR_T0 and BR_T1
BR_T001234567
factor BR_T011248163264
range BR_T1 1 to 32 33 to 64 33 to 64 33 to 64 33 to 64 33 to 64 33 to 64 33 to 64
Table 13. Selectable transfer speeds
Transfer speed (kbit/s) Serial SpeedReg Transfer speed accuracy (%)
(Hex.)
7.2 FA 0.25
9.6 EB 0.32
14.4 DA 0.25
19.2 CB 0.32
38.4 AB 0.32
57.6 9A 0.25
115.2 7A 0.25
128 74 0.06
230.4 5A 0.25
460.8 3A 0.25
921.6 1C 1.45
1228.8 15 0.32
Table 14. UART framing
Bit Length Value
Start bit (Sa) 1 bit 0
Data bits 8 bit Data
Stop bit (So) 1 bit 1
Table 15. Byte Order to Read Data
Mode byte 0 byte 1
RX address -
TX - data 0