NXP Semiconductors

SE050

Plug & Trust Secure Element

3.2 Credential Storage & Memory

Within SE050, all credentials and secure objects are stored inside a dynamic file

structure. At creation, a user has to associate a file identifier with the object created. This

identifier is then used in subsequent operations to access the object. The number of

objects that can be allocated is only limited by the available memory in the system. After

usage, objects can be deleted and the associated memory is freed up again.

There is also the possibility to create transient objects. Transient objects have an object

descriptor stored in non-volatile memory, but the object content is stored in RAM.

Together with the import/export functionality of SE050, transient objects can be used

securely store secret keys in a remote memory system.

3.3 Preprovisioned "Ease of Use" configurations

Some generic SE050 variants are offered pre-configured for ease of use and can be

used during development phase and in the field. With this customers have all keys pre-

injected in SE050 that are required for the main use cases as e.g. cloud onboarding. For

more information, see: [4]

3.4 Startup behaviour

If a supply voltage is applied to pins Vin, Vcc within the specified supply voltage operating

range or a RF field according to ISO/IEC 14443 is applied to antenna pins LA, LB the IC

boots up.

During boot the IC checks for active interface according list below (in the order of the list):

• ISO7816: If interface available for this product type, check CLK to be toggling, then wait

for RST to be high

• ISO14443: If interface available for this product type, check of RF field on LA, LB

antenna pins

• I2C: If interface available for this product type, check if both I2C_SDA, I2C_SCL pins

are at high level (internal weak pull-up active)

• The chosen interface is the only interface the SE050 will receive commands for

processing. To select a different interface the IC needs to be reset.

4 Communication interfaces

4.1 I2C Interfaces

The I2C interface vary according the specific SE050 variant see Section 4.1.1.

The SE050 has one I2C interface supporting target and one I2C interface supporting

controller mode.

The I2C target interface is the main communication interface of the device and is used by

the host controller to send arbitrary APDUs to the device. It supports clock frequencies

up to 3.4 MHz when operated in High-Speed Mode (HS). The I2C interface is using the

Smartcard T=1 over I2C protocol.

The default target address of the SE050 is configured to 0x48.

SE050

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Product data sheet

Rev. 3.5 — 22 August 2022

504935

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