NT3H2211W0FHKH Datasheet, PDF (30/77 Pages) NXP Semiconductors – NTAG I2C plus, NFC Forum Type 2 Tag compliant IC with I2C interface

NXP Semiconductors
NT3H2111/NT3H2211
NFC Forum Type 2 Tag compliant IC with I²C interface
8.4 Configurable Event Detection Pin
The event detection feature provides the capability to trigger an external device (e.g.
Controller) or switch on the connected circuitry by an external power management unit
depending on activities on the NFC interface.
The conditions for the activation of the field detection signal defined with FD_ON can be:
• The presence of the NFC field
• The detection of a valid command (Start of Communication)
• The selection of the IC
The conditions for the de-activation of the field detection signal defined with FD_OFF can
be:
• The absence of the NFC field
• The detection of the HALT state
• The NFC interface has read the last part of the NDEF message defined with
LAST_NDEF_BLOCK
All the various combinations of configurations are described in Table 13 and illustrated in
Figure 13, Figure 14 and Figure 15 for all various combinations of the filed detection
signal configuration. The timing diagrams are not in scale and all given timing values are
typical values.
The field detection pin can also be used as a handshake mechanism in the pass-through
mode to signal to the external Controller if
• New data is written to SRAM on the NFC interface
• Data written to SRAM from the Controller is read via the NFC interface.
See Section 11 for more information on this handshake mechanism.
In Figure 12 an example how to connect the FD pin is given. All given values are typical
values and may vary from application to application.
APPLICATION
supply
(1.2 V ~ 3.6 V)
Rpu
>2 kΩ
GND
event detect signal
Fig 12. FD pin example circuit
LA
1
VSS
2
SCL
3
FD
4
LB
8
VOUT
7
VCC
6
SDA
5
aaa-021652
NT3H2111/NT3H2211
Product data sheet
COMPANY PUBLIC
All information provided in this document is subject to legal disclaimers.
Rev. 3.0 — 3 February 2016
359930
© NXP Semiconductors N.V. 2016. All rights reserved.
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