AS39513 datasheet(17/108 Pages) AMSCO

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ams Datasheet

Page 17

[v1-10] 2018-Apr-25

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AS39513 − Detailed Description

IDLE Mode

In the IDLE mode the device is waiting for commands either

from the RFID or SPI interface. In this state the device can be

first initialized after the first power up by setting the related

EEPROM parameters. Initiating either interface and sending a

command enables the internal “command” signal that moves

the device into IDLE COMMAND mode.

In IDLE mode the data logging parameters can be configured

using Write System Block commands. Once fully configured a

Set mode command can be used to either commence logging

or change state to the WAIT state.

WAIT Mode

In WAIT mode the device is waiting before to enter in the ACTIVE

mode for a defined condition that is dependent on the System

parameters (Logging Control Parameters) set in the EEPROM.

WAIT mode provides in fact a mechanism to delay the start of

logging after the Set Mode command is issued.

If the parameter TMSRT is set to 1, then the WAIT mode will

transition to the ACTIVE mode after LOGDEL*512 seconds,

where LOGDEL is also part of the System Parameters.

If the parameter DIMD[1:0] is 2’b10, then the WAIT mode will

transition to the ACTIVE mode when the DIN pin is pulled low.

If TMSRT is 0 and DIMD is not 2’b10, then the WAIT mode will

transition without delay to the ACTIVE mode. (The bit fields

TMSRT, DIMD, and LOGDEL are further documented in the

Memory Map section.)

Commands from either the RFID or SPI interfaces are accepted

in the WAIT mode. If a command request and a start event occur

at the exact same time, the command processing has priority;

the mode will transition to ACTIVE when the command is done.

If a command is being processed when a start event occurs, the

start event is pending until the command is completed and

then the transition to ACTIVE mode occurs.

When the device transitions from the WAIT to the ACTIVE mode,

the real time clock counter (RTC) is reset to 0. In this way, the

baseline time of the AS39513 is the time that the device was

placed in ACTIVE mode.

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