SL3S4021 datasheet(10/30 Pages) NXP

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NXP Semiconductors

SL3S4011_4021

UCODE I²C

SL3S4011_4021

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Product data sheet

Rev. 3.5 — 18 September 2018

COMPANY PUBLIC

204935

10 / 30

10 Supported features

The UCODE I2C is equipped with a number of additional features and a custom

command. Nevertheless, the chip is designed in a way that standard EPCglobal READ /

WRITE / ACCESS commands can be used to operate the features.

The memory map in the previous section describes the Configuration Word used to

control the additional features located after address 200h of the EPC memory, hence

UCODE I2C features are controlled by bits located in the EPC number space. For this

reason, the standard READ / WRITE commands of a UHF EPCglobal compliant reader

can be used to select the flags or activate/deactivate features if the memory bank is not

locked. In case of locked memory banks the ChangeConfig custom command has to be

used.

The bits (flags) of the ConfigurationWord are selectable using the standard EPC SELECT

command.

10.1 UCODE I2C special feature

• Externally Supplied flag

The flag will indicate the availability of an external supply.

• RF active flag

The flag will indicate on which RF port power is available and signal transmission

ongoing.

• RF Interface on/off switching

For privacy reasons, the two RF ports as well as the I2C interface can be switched on/

off by toggling the related bits of the ConfigurationWord. The ConfigurationWord is

accessible via RF and I2C interface. Although it is possible to kill the RF interface via

the KILL feature of EPC Gen2, a minimum of one port shall be active at all times. In the

case of the dual port version, either one or both RF can be active. In the case of the

single front-end version, the RF port cannot be deactivated.

• I2C Interface on/off switching

For privacy reasons, the I2C port can be disabled by toggling the related bit of the

ConfigWord but only via RF.

• RF - I2C Bridge feature

The UCODE I2C can be used as an RF- I2C bridge to directly forward data from the

RF interface to the I2C interface and vice versa. The UCODE I2C is equipped with

a download/upload register of 16-bit data buffer located in the EPC bank. The data

received via RF can be read via I2C like regular memory content. In case the buffer

is empty reading the register returns NAK. This feature should be combined with the

Download Indicator or the interrupt signaling. The content of the buffer is only valid if

the download indicator is set and an interrupt was triggered (when interrupt signaling is

enabled in the ConfigWord).

– Upload Indicator flag (I2C to UHF) - address 203h in the configuration word

The flag will indicate if data in the download/upload register is available. Will be

automatically cleared when the download/upload register is read out via UHF.

– Download Indicator flag (UHF to I2C) - address 200h in the configuration word

The flag will indicate if data in the download/upload register is available. Will be

automatically cleared when the download/upload register is read out via I2C.

• Interrupt signaling/Download Indicator

The UCODE I2C features two methods of signaling:

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