AS3955 datasheet(41/111 Pages) AMSCO

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ams Datasheet

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[v1-01] 2015-Apr-29

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AS3955 − Detailed Description

Configuration Byte IC_CFG2

Figure 46:

Configuration Byte IC_CFG2

Note(s) and/or Footnote(s):

1. This byte can always be accessed for read and write via SPI / I²C and can be accessed for read and write from the RF side if rfcfg_en

is set to 1. Bits tun_mod and ext_mod represents a default value stored in a volatile memory which can be modified after initialization

over SPI / I²C.

Bit rfcfg_en enables the personalization process during

production at customer facilities. When this bit is set to 0, the

modification of the last two blocks is not possible anymore over

the RF field.

If auth_set is set then changing of authenticated setting

(authentication limits, read/write permission) is enabled over

the RF after successful authentication. Password can always be

changed via the RF side if tag is in authenticated state

regardless of the value of read/write bits.

Bit nak_on_crc_parity configures error handling mechanism as

described in Error Handling.

Bit selr_b6_inv configures SEL_RES response on Cascade Level

2. If selr_b6_inv is set to 1, bit b6 in SEL_RES response on Cascade

Level 2 will be inverted, otherwise it will be set as configured

in SELR byte.

Bits powm<1:0> are setting power modes as defined in Power

Management.

Conf. Bit

Name

Default

Function

Note

rfcfg_en

1: Enables personalization / configuration

over RF

tun_mod

1: Enables Tunneling Mode

ext_mod

1: Enables Extended Mode

nak_on_crc_parity

1: Defines error handling and response

auth_set

1: Configuration of the authentication

settings is enabled from RF side

selr_b6_inv

1: Inverts bit 6 in SEL_RES response on

Cascade Level 2

powm<1>

00: Power Mode 0

01: Power Mode 1

10: Power Mode 2

11: Power Mode 3

powm<0>

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