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NTP53X2 bảng dữ liệu(PDF) 100 Page - NXP Semiconductors

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Giải thích chi tiết về linh kiện  NTAG 5 link - NFC Forum-compliant I2C bridge
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NXP Semiconductors
NTP53x2
NTAG 5 link - NFC Forum-compliant I2C bridge
NTP53x2
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2020. All rights reserved.
Product data sheet
Rev. 3.3 — 3 July 2020
COMPANY PUBLIC
544533
100 / 133
NTAG 5 link supports the I2C protocol defined in UM10204. Any device that sends data
onto the bus is defined as a transmitter, and any device that reads the data from the bus
is defined as a receiver. The device that controls the data transfer is known as the "bus
master", and the other as the "slave" device. A data transfer can only be initiated by the
bus master, which will also provide the serial clock for synchronization.
8.3.1.1.1 Start condition
Start is identified by a falling edge of Serial Data (SDA), while Serial Clock (SCL) is
stable in the high state. A Start condition must precede any data transfer command.
NTAG 5 link continuously monitors SDA (except during a Write cycle) and SCL for a Start
condition, and will not respond unless one is given.
8.3.1.1.2 Stop condition
Stop is identified by a rising edge of SDA while SCL is stable and driven high. A Stop
condition terminates communication between NTAG 5 link and the bus master. A Stop
condition at the end of a Write command triggers the internal write cycle.
8.3.1.1.3 Acknowledge bit (ACK)
The acknowledge bit is used to indicate a successful byte transfer. The bus transmitter,
whether it is the bus master or slave device, releases Serial Data (SDA) after sending 8
bits of data. During the ninth clock pulse period, the receiver pulls Serial Data (SDA) low
to acknowledge the receipt of the 9th data bits.
8.3.1.1.4 Data input
During data input, the IC samples SDA on the rising edge of SCL. For correct device
operation, SDA must be stable during the rising edge of SCL, and the SDA signal must
change only when SCL is driven low.
8.3.1.1.5 Addressing
To start communication between a bus master and NTAG 5 link, the bus master must
initiate a Start condition. Following this initiation, the bus master sends the device
address. The IC address from I2C consists of a 7-bit device identifier (see Table 229 for
default value).
As long as I2C address is 7 bit long, the 8th bit (least significant bit) is used as the Read/
Write bit (R/W). This bit is set to 1b for Read and 0b for Write operations.
If a match occurs on the device address, the IC gives an acknowledgment on SDA during
the 9th bit time. If the IC does not match the device select code, it deselects itself from
the bus and clears the register I2C_IF_LOCKED (see Table 88).
Table 229. Default NTAG 5 I2C address from I2C
Device address
b6
b5
b4
b3
b2
b1
b0
Value
1 [1]
0 [1]
1 [1]
0 [1]
1 [1]
0 [1]
0 [1]
[1]
Initial values - can be changed.
The I2C address of NTAG 5 link (Configuration Byte) can be modified by the NFC and I2C
interface.


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