MAX66120 MAXIM [Maxim Integrated Products], MAX66120 Datasheet - Page 15

• Manufacturer Part Number: MAX66120
• Description: ISO 15693-Compliant 1Kb Memory Fob Powered Entirely Through the RF Field
• Manufacturer: MAXIM [Maxim Integrated Products]

The Stay Quiet command addresses an individual slave
and transitions it to the quiet state. The request must be
sent in the addressed mode (Select_flag bit = 0,
Address_flag bit = 1). The slave transitioning to the
quiet state does not send a response.
The Select command addresses an individual slave
and transitions it to the selected state. The request
must be sent in the addressed mode (Select_flag
bit = 0, Address_flag bit = 1). The slave transitioning to
the selected state sends a response. If there was a
slave with a different UID in the selected state, then that
slave transitions to the ready state without sending a
response.
The Reset to Ready command addresses an individual
slave and transitions it to the ready state. To address a
slave in the quiet state, the request must be sent in the
addressed mode (Select_flag bit = 0, Address_flag
bit = 1). To address a slave in the selected state, the
request can be sent in any address mode. The slave
transitioning to the ready state sends a response.
* If this command is processed without any error, the slave responds with a response flags byte of 00h.
* If this command is processed without any error, the slave responds with a response flags byte of 00h.
** The UID is transmitted only in the addressed mode.
REQUEST FLAGS
REQUEST FLAGS
REQUEST FLAGS
(1 Byte)
(1 Byte)
(1 Byte)
______________________________________________________________________________________
ISO 15693-Compliant 1Kb Memory Fob
Reset to Ready
Stay Quiet
Select
COMMAND
COMMAND
COMMAND
Request Data for the Reset to Ready Command*
02h
25h
26h
The command descriptions show the data fields of the
request and response data packets. To create the com-
plete frame, an SOF, 16-bit CRC, and EOF must be
added (see Figure 5). ISO 15693 defines three address
modes, selected, addressed, and nonaddressed,
which are specified through the setting of the
Select_flag bit and the Address_flag bit. The memory
and control function commands can be issued in any
address mode. To access slaves in the quiet state, the
addressed mode is required. The addressed mode
requires that the master include the slave's UID in the
request.
Depending on the complexity of a function, various
error conditions can occur. In case of an error, the
response to a request begins with a response flags
byte 01h followed by one 1-byte error code.
Table 5 shows a matrix of commands and potential
errors. If there was no error, the response begins with a
response flags byte 00h followed by command-specific
data, as specified in the detailed command description.
If the MAX66120 does not recognize a command, it
does not generate a response.
Request Data for the Stay Quiet Command
Request Data for the Select Command*
Memory and Control Function
(8 Bytes)
(8 Bytes)
(8 Bytes)
UID**
UID
UID
Error Indication
Commands
15