AS39513 datasheet(23/108 Pages) AMSCO

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[v1-10] 2018-Apr-25

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AS39513 − Detailed Description

Memory Pointer: Assuming the data can and should be logged,

the logging begins at the current value of the MEASPTR[11:0],

where MEASPTR[11:2] represents the EEPROM address for the

first log data, and 2*MEASPTR[1:0] is the bit position at which

to start the log data. The data is logged in the following order,

with increasing pointer addresses for each log value.

Once all the logging values are stored, and if the adjust logging

information ADJUST parameter is set to 1, then the MEASPTR is

rounded up to the nearest byte boundary. This wastes some

memory space in return for being able to easily calculate the

byte position of each log point.

Format Options: In order to minimize EEPROM usage, data is

logged at 2-bit boundaries according to the format options

LOGFMT: all measurement data is logged using either 8 or 10

bits.

The 8-bit format is used if both logging mode LOGMD = 2’b00

and logging format LOGFMT = 0. Otherwise, 10 bits are used.

Measurement Storing Sequence: First, if a temperature

measurement was made, the result in ts_res_ff is written.

Second, if an external measurement was made, the value in

ex_ref_ff is written. Third, if a battery voltage measurement was

made, the result in bv_res_ff is written.

Note the number of bits (8 or 10) stored for the temperature,

external sensor and battery voltage measurements depends on

the LOGFMT and LOGMD configuration settings.

Optional Status Signals: After the measurements are

recorded, the status of two digital signals can optionally be

recorded. If the optional logging data DLOG is 1, then the values

of the digital signals at the DIN pin (the digital input din_i) and

the external sensor interrupt SEXT (extirq_i) are recorded using

the 2-bit value { din_i, extirq_i }.

Note that if DLOG is the only logging option selected, that

means, there are no ADC measurements enabled, then the

logging state machine will wait about 3ms (the approximate

time for one ADC conversion) in order for the external voltage

at the SEXT pin to settle.

Note that if the value of the extirq_i signal want to be used, then

the Enable external sensor interrupt EIEN field must be set to 1

in order to enable the comparator that generates the extirq_i

interrupt event.

Logging Modes: Finally, information about this measurement

are written, depending on the logging mode.

If interrupt logging mode is used (LOGMD = 2’b01), then the

30-bit real-time clock counter value is logged, followed by a

two-bit value that indicates the logging event trigger source

(further detail will follow in the Memory Map section).

If one of the two limit logging modes is used (LOGMD = 2’b01

or LOGMD = 2’b11), the 16-bit log counter LOGCNT is written

into the EEPROM.

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