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

APPLYING THE I²C PROTOCOL TO THE CRX14 REGISTERS

I²C Parameter Register Protocol

Figure 11. shows how new data is written to the

Parameter Register. The new value becomes ac-

tive after the I²C STOP condition.

Figure 12. shows how to read the Parameter Reg-

ister contents. The CRX14 sends and re-sends the

Parameter Register contents until it receives a

NoACK from the I²C Host.

The CRX14 supports the I²C Current Address and

Random Address Read modes. The Current Ad-

dress Read mode can be used if the previous

command was issued to the register where the

Read is to take place.

Figure 11. Host-to-CRX14 Transfer: I²C Write to Parameter Register

S

T

Bus Master

A

R

T

R/W

Device Select

Code

Parameter Register

Address

S

Register Byte

Value

T

O

P

CRX14 Write

1 0 1 0X X X

00h

data

Bus Slave

ACK

ACK

ACK

ai09240

Figure 12. CRX14-to-Host Transfer: I²C Random Address Read from Parameter Register

R

E

S

R/W

T

S

T

R/W

Bus Master A

R

T

Device Select

Code

Parameter Register A Device Select

Address

R

Code

T

NoACK

S

T

O

P

CRX14 Read

1 0 1 0X X X

00h

1 0 1 0X X X

data

Bus Slave

ACK

ACK

Register Byte

ACK

Value

ai09241

Figure 13. CRX14-to-Host Transfer: I²C Current Address Read from Parameter Register

Bus Master

CRX14 Read

Bus Slave

S

R/W

T

A Device Select

R

Code

T

NoACK

S

T

O

P

1 0 1 0X X X

data

ACK

Register Byte

Value

ai09242

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