SL900A-ASWB datasheet(21/90 Pages) AMSCO

21 / 90 page

ams Datasheet: 2014-May-06 [v1-01]

SL900A – 21

S y st em D e scription

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” on page 18.):

By default (factory setting), the voltage references are set: Vo1

= 0V, Vo2 = 310mV. This yields a theoretical temperature

conversion range of -89.3ºC ~ +94.6ºC. The temperature

conversion equation for this setting is:

When the reference voltages are set to some other value, the

following equation needs to be used for temperature

conversion:

The Vo1 and Vo2 in the above equation have to be in mV.

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” on page 18.). 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

°C

()

⋅

code∗Resolution

Low temp limit

⋅⋅

–

°C

()

⋅

code∗0.18

°C 89.3°C

–

LSB

0.18

°C

Offset

89.3

–

()°C

°C

()

⋅

Vo2 mV

[] code 1024

() code Vo1 mV

[]

⋅

–

⋅

1024 1.686

⋅

------------------------------------------------------------------------------------------------------------------

273.15

–

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