SL13A-ASWB datasheet(31/49 Pages) AMSCO

31 / 49 page

ams Datasheet: 2014-May-06 [v1-01]

SL13A – 31

C o mmands

Out-of-Limits Counter

The Out-of-Limits counter can be used as an advanced alarm

mechanism. It is enabled in log format with temperature limits

and it will display the cumulative number of measurements that

are outside the specified limit. The application does not have

to read the whole EEPROM content in order to determine if the

temperature limits have been exceeded, just the Out-of-Limits

block. The Out-of-Limits counter block can be read out with the

Get Log State command.

Logging Timer

The SL13A device has an integrated RC oscillator that is

calibrated to 1024Hz. This oscillator drives the logging timer.

The logging timer resolution is 1 second, the maximum period

is 9.1 hours (32768 seconds).

The measurement real time is derived from 4 parameters - the

Start time (ST ), the Delay time (DT ), the measurement period

(MP) and the # of the measurement (NM). This value has to be

calculated in the reader by the equation:

Real time = ST+DT+MP*NM

Delay Time

The SL13A supports delayed start of the logging procedure. The

Delay time has a resolution of 8.53 minutes and a maximum

value of 582 hours (12 bits). The delay time value is set with the

Initialize command, while the Delay time counter starts

counting when the device receives the Start Log command.

Temperature Conversion

The calibration data does not have to be included in the

temperature conversion equation. The temperature value is

calculated as:

T(ºC) = code*0.169 – 92.7 – 5.4

LSB = 0.169ºC

offset = -92.7ºC

offset calibration = 0.169 * 32 = 5.4ºC

SL13A-ASWB Datasheet(PDF) 31 Page - ams AG