NT3H2111 Datasheet, PDF (66/77 Pages) NXP Semiconductors – Designed to be the perfect enabler for NFC in home-automation

NXP Semiconductors
NT3H2111/NT3H2211
NFC Forum Type 2 Tag compliant IC with I²C interface
• The NFC interface polls/reads the bit SRAM_RF_READY from NS_REG (see
Table 14) to know if new data has been written by the I²C interface in the SRAM
• A trigger on the FD pin indicates to the host that data has been read from SRAM by
the NFC interface. This feature can be enabled by programming bits 5:2 (FD_OFF,
FD_ON) of the NC_REG appropriately (see Table 13)
The above mechanism is illustrated in the Figure 30.
RF field
FD pin
ON
OFF
HIGH
LOW
I2C_LOCKED
0
1
0
RF_LOCKED
0
1
SRAM_RF_READY
0
1
RF_FIELD_PRESENT
1
PTHRU_ON_OFF = 0b,
FD_ON = 11b, FD_OFF = 11b
SRAM_MIRROR_ON_OFF = 0b
3Ch
7Ch
TRANSFER_DIR = 0b
1
0
0
0
0
3Ch
t
Event
more data available?
aaa-021661
Fig 30. Illustration of the Field detection signal feature in combination with pass-through mode
for data transfer from I²C to NFC
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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