Datasheet

NXP Semiconductors
MF0ICU2
MIFARE Ultralight C - Contactless ticket IC
MF0ICU2 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2019. All rights reserved.
Product data sheet Rev. 3.3 — 30 July 2019
COMPANY PUBLIC 137633 18 / 36
8.2 Timings
The timing shown in this document are not to scale and values are rounded to 1 μs.
All given command and response transmission times refer to the data frames including
start of communication and end of communication. A PCD data frame contains the start
of communication (1 "start bit") and the end of communication (one logic 0 + 1 bit length
of unmodulated carrier). A PICC data frame contains the start of communication (1 "start
bit") and the end of communication (1 bit length of no subcarrier).
The minimum command response time is specified according to Ref. 2 as an integer n
which specifies the PCD to PICC frame delay time. The frame delay time (FDT) from
PICC to PCD is at least 87 μs which corresponds to a n=9. The maximum command
response time is specified as a time-out value. Depending on the command, the T
ACK
value specified for command responses defines the PCD to PICC frame delay time. It
does it for either the 4-bit ACK/NAK value specified in Section 8.3 or for a data frame.
All command timings are according to ISO/IEC 14443-3 frame specification as shown for
the Frame Delay Time in Figure 10. For more details refer to Ref. 1 and Ref. 2.
aaa-006279
last data bit transmitted by the PCD
FDT = (n* 128 + 84)/fc
first modulation of the PICC
FDT = (n* 128 + 20)/fc
128/fc
logic „1“
128/fc
logic „0“
256/fc
end of communication (E)
256/fc
end of communication (E)
128/fc
start of
communication (S)
128/fc
start of
communication (S)
Figure 10. Frame Delay Time (from PCD to PICC) and T
ACK
and T
NAK
Remark: Due to the coding of commands, the measured timings usually excludes (a part
of) the end of communication. Consider this factor when comparing the specified with the
measured times.
8.3 MIFARE Ultralight C ACK and NAK
The MIFARE Ultralight C - Contactless ticket IC uses, apart from the responses defined
in the following sections, two half-byte answers to acknowledge the command received in
ACTIVE and AUTHENTICATED state (see Figure 4) abbreviated as ACK and NAK.
The MIFARE Ultralight C - Contactless ticket IC distinguishes between positive (ACK)
and negative (NAK) acknowledge. Valid values for ACK and NAK are shown in Table 15.
Table 15. ACK and NAK values
Answer value Answer explanation
Ah positive acknowledge (ACK)