SL900A datasheet(21/103 Pages) AMSCO

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[v1-12] 2018-Oct-29

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SL900A − System Description

Figure 20:

Storage Rule

Limits Counter

The Limits counter can be used as an advanced alarm

mechanism. It is enabled in all log formats and it will display

the cumulative number of measurements that are outside

limits. The application does not have to read the whole EEPROM

content in order to determine if the temperature limits have

been exceeded, just the Limits counter block. The Limits

counter block can be read out with the GET LOG STATE

command.

The system uses 4 limits that can be set by the user:

• Extreme upper limit

• Upper limit

• Lower limit

• Extreme lower limit

There is a dedicated 8-bit counter for each of the 4 limits in the

Limits counter block. The appropriate counter will increment

each time a sensor value is outside a limit.

The user can select which sensor will be used in the limits

comparison. The internal temperature sensor is selected by

default. Other sensors can be selected with the SET SFE

PARAMETERS command with the “Verify sensor ID[1:0]” field

(SPI address 0x018):

Figure 21:

Modes of Operation

Bit

Storage Rule

Description

0Normal

When the logging area in the EEPROM is full, the chip does not store any new

sensor data to the EEPROM, but it will still increment the measurement counter

and RTC.

Rolling

When the logging area is full, the chip continues with writing new sensor data

to the EEPROM form the beginning of the logging area. Thus the chip

overwrites the old stored data and increments the “Number of memory

replacements [5:0]” field in the System status group.

Verify Sensor ID Bit 1

Verify Sensor ID Bit 0 Sensor Selected for Limits Comparison

Internal temperature sensor - DEFAULT

External sensor 1

External sensor 2

Battery voltage

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