AS39513 datasheet(21/108 Pages) AMSCO

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[v1-10] 2018-Apr-25

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AS39513 − Detailed Description

Limit Check Algorithm

Once all the enabled measurements are done, an optional limit

check algorithm begins. The AS39513 can be set to only record

logging information if certain limit conditions are met. The

internal temperature sensor and external sensor each have

independent limit conditions. The ADC result for each sensor

measurement is compared to four thresholds to determine the

limit result. The limit thresholds are each 8-bit in length and are

the 8 MSB values when compared to the 10-bit ADC values.The

limit results follow the tables below. If a sensor is not enabled

for logging, its limit result is taken to be 3’b000.

Figure 11:

Limit Check Results for Temperature Sensor

Figure 12:

Limit Check Results for External Sensor

Note that in the computation of the limit result, the conditions

are checked in the order given in the tables above. It is possible

that more than one condition can be met at the same time,

because there is no check on the relative values of the four limit

parameters for each sensor. The first condition that is true in

the order given in the table is the condition that determines the

limit result.

Step

Condition

ts_lim

ts_res_ff ≥ { TXHILIM, 2’b00 }

3’b100

ts_res_ff ≤ { TXLOLIM, 2’b11 }

3’b101

ts_res_ff ≥ { THILIM, 2’b00 }

3’b110

ts_res_ff ≤ { TLOLIM, 2’b11 }

3’b111

Otherwise

3’b000

Step

Condition

ex_lim

ex_res_ff ≥ { EXHILIM, 2’b00 }

3’b100

ex_res_ff ≤ { EXLOLIM, 2’b11 }

3’b101

ex_res_ff ≥ { EHILIM, 2’b00 }

3’b110

ex_res_ff ≤ { ELOLIM, 2’b11 }

3’b111

Otherwise

3’b000

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