CRX14 데이터 시트보기 (PDF) - STMicroelectronics

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CRX14

Low Cost ISO14443 type-B Contactless Coupler Chip with Anti-Collision, CRC Management and Anti-Clone Function

STMicroelectronics 

CRX14

I²C Authenticate Register Protocol

For information please contact your nearest STMi-

croelectronics sales office.

I²C Slot Marker Register Protocol

An I²C Write command to the Slot Marker Register

generates an automated sixteen-command loop

(See Figure 17. for a description of the command).

All the answers from the ST short range memory

devices that are detected, are written in the Input/

Output Frame Register.

Read from the I²C Slot Marker Register is not sup-

ported by the CRX14. If the I²C Host tries to read

the Slot Marker Register, the CRX14 will return the

data value FFh in both Random Address and Cur-

rent Address Read modes until NoACK is generat-

ed by the I²C Host.

The result of the detection sequence is stored in

the Input/Output Frame Register. This Register

can be read by the host by using I²C Random Ad-

dress Read.

Figure 17. Host-to-CRX14 Transfer: I²C Write to Slot Marker Register

Bus Master

CRX14 Write

Bus Slave

S

R/W

T

S

A Device Select

Slot Marker

T

R

Code

Register

O

T

Address

P

1 0 1 0X X X

03h

ACK

ACK

ai09246

Figure 18. CRX14-to-Host Transfer: I²C Random Address Read from Slot Marker Register

S

T

Bus Master A

R

T

R/W

Device Select

Code

Slot Marker

Register

Address

R

E

S

T

R/W

A Device Select

R

Code

T

NoACK

S

T

O

P

CRX14 Read

1 0 1 0X X X

00h

1 0 1 0X X X

FFh

Bus Slave

ACK

ACK

ACK

ai09247

Figure 19. CRX14-to-Host Transfer: I²C Current Address Read from Slot Marker Register

Bus Master

CRX14 Read

Bus Slave

S

R/W

T

A Device Select

R

Code

T

1 0 1 0X X X

ACK

NoACK

S

T

O

P

FFh

ai09248

19/40

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