SL900A datasheet(62/90 Pages) AMSCO

62 / 90 page

SL900A – 62

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

Ex ter n al S e ns or F r o n t - End ( S FE)

The interrupt mode is selected with the SET LOG MODE

command with the “Logging Mode[2:0]” field (“Logging

Formats” on page 41). The implemented IRQ modes are:

Figure 54:

IRQ Logging Modes

Either of the 2 external sensor pads, or both of them, can be

used for generating an interrupt. This function can also be used

for button-triggered measurements, as the user can select

which sensor will be logged during an interrupt event.

The interrupt level can be selected by the application with the

SET CALIBRATION DATA command (“irlev[1:0]”). The setting is

valid for EXT1 and EXT2.

Figure 55:

Sensor Front End Setting Bits

The IRQ threshold varies from chip to chip for a maximum of

±25% from its nominal specified value. The ratio between levels

at different IRQ-level-CODE remains constant. The IRQ voltage

levels are supply ratiometric.

Bit 2

Bit 1

Bit 0

Logging Form

Description

IRQ, EXT1

Interrupt triggered on the EXT1 external

sensor input

IRQ, EXT2

Interrupt triggered on the EXT2 external

sensor input

IRQ, EXT1, EXT2

Interrupt triggered on the EXT1 and EXT2

external sensor input

Irlev [1:0]

EXT1 resistive – [MΩ]

EXT2 resistive - [MΩ]

IRQ level - % of

supply voltage

Bit 1

Bit 0

< 3

< 25 %

< 1

< 8 %

< 4.2

< 35 %

< 5.2

< 43%

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