AS3955 datasheet(34/102 Pages) AMSCO

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[v1-04] 2016-Feb-03

AS3955 − Detailed Description

Lock bits apply only to RF interface, as SPI / I²C interface has

unlimited access to user data area.

• Lock 0 byte locks 8 blocks starting from address 00h where

lock bit 0 locks block on address 00h

• Lock 1 byte locks 8 blocks starting from address 08h where

lock bit 0 locks block on address 08h

• Lock 2 byte locks 16 blocks starting from address 10h

where lock bit 0 locks block on address 10h and 11h

• Lock 3 byte locks 16 blocks starting from address 20h

where lock bit 0 locks block on address 20h and 21h

• Lock 4 byte locks 16 blocks starting from address 30h

where lock bit 0 locks block on address 30h and 31h

• Lock 5 byte locks 16 blocks starting from address 40h

where lock bit 0 locks block on address 40h and 41h

• Lock 6 byte locks 16 blocks starting from address 50h

where lock bit 0 locks block on address 50h and 51h

• Lock 7 byte locks 16 blocks starting from address 60h

where lock bit 0 locks block on address 60h and 61h

• Lock 8 byte locks 16 blocks starting from address 70h

where lock bit 0 locks block on address 70h and 71h

Figure 33:

Example of Lock Bits

Capability Container

Block 03h in AS3955 EEPROM contains the Capability Container

(CC), pre-programmed during IC production according to NFC

Forum Type 2 Tag specifications [T2T ]. CC bits are OTP, i.e.

setting bits to 1b is an irreversible operation. Bits at 0b can be

set to 1b through a WRITE operation, the result being a bit-wise

OR with the current value.

Figure 34 and Figure 35 show the Capability Container content

at delivery.

Figure 34:

CC Content at Delivery (4kbit Option)

Lock 0 byte

Lock 1 byte

locks block

07h

06h

05h

04h

03h

02h

01h

00h

0Fh

0Eh

0Dh

0Ch

0Bh

0Ah

09h

08h

Byte number in block

Block address

03h

E1h

10h

3Bh

00h

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