SL900A datasheet(14/103 Pages) AMSCO

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[v1-12] 2018-Oct-29

SL900A − Shor t Description

Temperature Sensor

The on-chip temperature sensor is set with a default

temperature range of -29.3ºC to 58.1ºC and can measure the

temperature in the range from 0ºC to 10ºC with an accuracy of

TSRA. The temperature sensor is calibrated at VBAT=3.0V and

accuracy is only guaranteed in logging mode and not in the

presence of a strong RF field. A strong RF field can produce self

heating of the chip. Please note the assembly method used can

affect the temperature sensor accuracy.

It is recommended that care is taken with the assembly method

of the die as the on chip temperature sensor is sensitive to

mechanical stress. The temperature sensor accuracy was

confirmed in a calibrated oil bath using wirebonded SL900A die

assembled in ceramic DIL packages with non-conductive glue

for die attach, glued lids and no bondwire on bondpad EXT2.

Final accuracy of the completed product should in any case be

checked during product development especially where

different die assembly methods are used.

The temperature sensor can be reconfigured for other

temperature ranges but the sensor will need recalibrating if the

range is changed from the default values.

External Sensors

The on-chip external sensor front end provides a flexible

interface for analog external sensors. It has an auto-range and

interrupt function. It supports various types of analog sensors

from pressure, humidity, temperature, light …

Analog to Digital Converter

The chip has an integrated 10-bit analog to digital converter

with selectable voltage references. It is used for conversion of

temperature, external sensors and battery voltage.

External Sensor Interrupt

The external sensor inputs EXT1 and EXT2 can be used for

event-triggered logging. In this mode, the logging is not

triggered in predefined time intervals from the internal timer,

but can be triggered externally, either with a sensor, switch or

a microcontroller.

The interrupt source can be the EXT1, EXT2 input or both, were

the EXT1 input has the higher priority. The user application can

select which measurements are triggered by the interrupt

event.

In the interrupt mode, the sensor value is stored together with

the 32-bit real time clock value. For a correct real-time clock

value, the correct Start time has to be supplied. The interrupt

mode is started with the START LOG command and the correct

setting in the registers (SET LOG MODE command).

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