NTP53X2 datasheet(108/133 Pages) NXP

108 / 133 page

NXP Semiconductors

NTP53x2

NTAG 5 link - NFC Forum-compliant I2C bridge

NTP53x2

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Product data sheet

Rev. 3.3 — 3 July 2020

COMPANY PUBLIC

544533

108 / 133

aaa-035476

tuning cap

optional open drain control

signal to control host

Rpu

1 µF

HOST

VCC

VOUT

VDD

GND

VOUT configurable to 1.8 V, 2.4 V or 3 V

GND

Figure 13. Energy harvesting example circuit

How to use energy harvesting in applications is described in AN12365.

8.6 Security

NTAG 5 link implements different levels to protect data. The easiest, but efficient method

is to lock EEPROM to read only.

With the plain password authentication scheme, the memory can be split in three

different parts with different access conditions.

With NTP5332's mutual AES authentication the memory is split in three different parts

again, but with the advantage, that the password will never be transmitted in plain text.

Configuration area and SRAM can be protected from both interfaces as well.

Further implementation details can be found in AN12366.

8.6.1 Locking EEPROM to read only

Independent on the split of the memory, the user memory may be locked to read-only.

If the user EEPROM shall stay in read/write state, the LOCK BLOCK command can be

disabled (see Table 39) and lock block sections can be locked (see Table 80). With these

features, it can be ensured, NTAG 5 link stays in read/write state.

Locking the complete EEPROM to read-only as defined in NFC Forum Type 5 Tag

specification is quite time consuming. Every single block needs to be addressed by a

LOCK BLOCK command (see Section 8.2.3.5). To accelerate this locking, NTAG 5 link

stores the information in the configuration area. With this feature, locking the EEPROM

can be accelerated by a factor of 16. Note, that these bits are one time programmable

(see Section 8.1.3.30) and blocks are indicated as locked in the Get Multiple Block

Security Status response.

As long as I2C Lock Block Configuration bytes are not set to 1b, the user EEPROM may

still be modified from I2C perspective.

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