CRX14_10 Datasheet, PDF (21/47 Pages) STMicroelectronics – ISO14443 type-B contactless coupler chip with anti-collision, CRC management and anti-clone function

CRX14
CRX14 I²C protocol description
After reading each Byte, the CRX14 waits for the master to send an ACK during the 9^th bit
time. If the master does not return an ACK within this time, the CRX14 terminates the data
transfer and switches to stand-by mode.
Figure 9. CRX14 I²C read modes sequences
I²C CURRENT ADDRESS READ
R/W
ACK
ACK
ACK
BUS Master
DEV SEL
CRX14 READ
BUS Slave
DATA 1
ACK
I²C RANDOM ADDRESS READ
R/W
DATA 2
DATA 3
DATA 4
R/W
ACK
BUS Master
CRX14 READ
DEV SEL
ADDRESS
DEV SEL
BUS Slave
ACK
ACK
DATA 1
ACK
DATA 2
ACK
NoACK
DATA N
ACK
NoACK
DATA N
AI09266
Doc ID 8880 Rev 4
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