AS39513 datasheet(20/108 Pages) AMSCO

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[v1-10] 2018-Apr-25

AS39513 − Detailed Description

Sensor Measurements

After the battery check, the sensor measurements are made.

The three possible measurement that consist of Temperature,

External Sensor and Battery Voltage are independently enabled

by the System parameters TSMEAS, EXMEAS, and BVMEAS part

of the System EEPROM fields, and they are executed in a fixed

sequence as they are reported below.

First, there is the temperature measurement. If TSMEAS is 1, the

temperature circuits are enabled, and the temperature

configuration values for the references and ADC are loaded.

After a wait period for analog settling, an ADC measurement is

taken, and the result is stored in ts_res_ff[9:0].

Next is the external sensor measurement. If EXMEAS is 1, the

external sensor circuitry is enabled, including the optional

current drive for the external sensor. The external sensor values

for the references and ADC are loaded, and a wait period ensues

to allow for analog settling. After the wait period, an ADC

measurement is taken, and the result is stored in ex_ref_ff[9:0].

Finally, there is the battery voltage measurement. If BVMEAS is

1, the battery measurement circuits are enabled, and the

battery voltage configuration values for the reference and ADC

are loaded. After a wait period for analog settling, an ADC

measurement is taken, and the result is stored in bv_res_ff[9:0].

AS39513 Fiches technique(PDF) 20 Page - ams AG