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MYoun.4
MYoun.4
Associate
September 8, 2021
Solved

ST25RU3993-HPEV PIE encoding pulse width (PW)

  • September 8, 2021
  • 1 reply
  • 632 views

Hi :)

I know ST25RU3993 use PIE encoding when it transmits data.

In EPC Gen-2 protocol, PW (pulse width, in attached image) used in PIE has a value:

MAX(0.265Tari, 2 μs)<=PW<=0.525Tari

I want to know what range of PW ST25RU3993-HPEV can use.

Thank you.

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0693W00000DmUHZQA3.jpg

This topic has been closed for replies.
Best answer by Bart Herse

Hi MYoun.4,

let me refer to the datasheet of ST25RU3993.

In Table 12 on page 49, explaining the purpose of the TX options register, it is shown that the TARI can be set to 6.25µs, 12.5µs and 25µs.

The PIE symbol for a logic one can be changed in the same register.

Using the bits TXOne[1:0] the length of a PIE-"1" can be changed.

There is no way to change PW directly, but PW will be always half of TARI value.

Cheers,

B

1 reply

Bart Herse
Bart HerseBest answer
Technical Moderator
September 29, 2021

Hi MYoun.4,

let me refer to the datasheet of ST25RU3993.

In Table 12 on page 49, explaining the purpose of the TX options register, it is shown that the TARI can be set to 6.25µs, 12.5µs and 25µs.

The PIE symbol for a logic one can be changed in the same register.

Using the bits TXOne[1:0] the length of a PIE-"1" can be changed.

There is no way to change PW directly, but PW will be always half of TARI value.

Cheers,

B

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