SL900A datasheet(24/103 Pages) AMSCO

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[v1-12] 2018-Oct-29

SL900A − System Description

Temperature Conversion

The calibration data does not have to be included in the

temperature conversion equation. The temperature value

calculation is dependent on the selected voltage references

(see Analog to Digital Conversion):

By default (factory setting), the voltage references are set:

Vo1 = 260mV, Vo2 = 410mV. This yields a temperature

conversion range of -29.3ºC ~ 58.1ºC. The temperature

conversion equation for this setting is:

Please note if the ADC voltage references are changed from the

default values, the temperature sensor calibration is no longer

valid.

Battery Voltage Conversion

The battery voltage conversion is dependent on the initial

battery voltage (1.5V or 3V) and on the selected voltage

references (see Analog to Digital Conversion). The conversion

equations with factory selected voltage references (Vo1 = 0V,

Vo2 = 310mV) are:

For 1.5V battery, the equation is:

• V = code*0.85mV + 873mV

• LSB = 0.85mV

• Offset = 873mV

For 3V battery:

• V = code*1.65mV + 1.69V

• LSB = 1.65mV

• Offset = 1.69V

The code for the battery measurement is 10bits. This code is

formed from 6 MSB bits from the logged battery measurement

padded with 4 LSB 0s

(EQ3)

°C

()

⋅

code∗Resolution Low temp limit

⋅⋅

–

(EQ4)

°C

()

⋅

code∗0.0855

°C 29.3°C

–

(EQ5)

LSB

0.0855

°C

(EQ6)

Offset

29.3

–

()°C

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