CR14-MQP/1GE STMicroelectronics, CR14-MQP/1GE Datasheet - Page 23

• Manufacturer Part Number: CR14-MQP/1GE
• Description: IC TYPE-B CHIP I2C ECO 16-SOIC N
• Manufacturer: STMicroelectronics

Specifications of CR14-MQP/1GE

• Rf Type: Transceiver
• Frequency: 13.56MHz
• Features: ISO14443-B
• Package / Case: 16-SOIC (0.154", 3.90mm Width)
• Pin Count: 16
• Screening Level: Commercial
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-5719-1; 497-5719-1; 497-5719-5

CR14
5.2
Figure 13. Host-to-CR14 transfer: I²C write to I/O frame register for ISO14443B
Figure 14. CR14-to-host transfer: I²C random address read from I/O frame register for
Master
CR14
Bus
Master
CR14
Read
Bus
Slave
Write
Slave
Bus
Bus
S
T
A
R
T
S
T
A
R
T
1 0 1 0 XX X
1 0 1 0XXX
Device
Select
Code
I²C input/output frame register protocol
Figure 13
Input/Output Frame Register.
After the I²C STOP condition, the request frame is RF transmitted in the ISO14443 type-B
format. The CR14 then waits for the PICC answer frame which will also be stored in the
Input/Output Frame Register. The request frame is over-written by the answer frame.
Figure 14
The two CRC Bytes generated by the PICC are not stored.
The CR14 continues to output data Bytes until a NoACK has been generated by the I²C
Host, and received by the CR14. After all 36 Bytes have been output, the CR14 “rolls over”,
and starts outputting from the start of the Input/Output Frame Register again.
The CR14 supports the I²C Current Address and Random Address Read modes. The
Current Address Read mode can be used if the previous command was issued to the
register where the Read is to take place.
ISO14443B
Device
Select
Code
R/W
R/W
ACK
ACK
Input/Output
Register
Address
shows how to store a PICC request frame command of N Bytes into the
shows how to read an N-Byte PICC answer frame.
Input/Output
Register
Address
01h
01h
ACK
R
E
S
T
A
R
T
ACK
1 0 1 0 XXX
Request Frame
Device
Select
Code
Length N
N
R/W
ACK
Doc ID 11922 Rev 2
ACK
Received
Length
Frame
N
Command
PICC
Code
Data 1
Applying the I²C protocol to the CR14 registers
ACK
Answer
Data1
Frame
ACK
Data
Command
Parameter
ACK
PICC
Data 2
Answer
Frame
Data 2
Data
ACK
ACK
Command
Parameter
PICC
Answer
Frame
Data
ACK
ACK
Command
Parameter
Data N
PICC
Data N
Answer
Frame
Data
NoACK
ai12041
ai12042
ACK
23/47
S
T
O
P
S
T
O
P