TIC10024-Q1 Datasheet, PDF (67/81 Pages) Texas Instruments – 24-Input Multiple Switch Detection Interface (MSDI) Device With Adjustable Wetting Current for Automotive Systems

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TIC10024-Q1
SCPS268 – SEPTEMBER 2017
– Program the wetting current to 10 mA by configuring WC_IN0_IN1 bits to 100 in the WC_CFG0 register
– Disable wetting current auto-scaling by setting AUTO_SCALE_DIS_CSO bit in WC_CFG1 register to 1
– Program the comparator threshold to 4 V by setting the THRES_COMP_IN0_IN3 bits to 11 in the
THRES_COMP register
– Program interrupt generation to both rising and falling transitions by setting the INC_EN_0 bits to 11 in
the INT_EN_COMP1 register
– Enable interrupt generation from switch state change by setting the SSC bit to 1 in the INT_EN_CFG0
register
– Program the CONFIG register: Keep the device in continuous mode by setting the POLL_EN bit to 0.
Start device operation by setting the TRIGGER bit to 1.
– Read the INT_STAT register to clear the baseline SSC interrupt once the interrupt is observed.
– Toggle the external switch open and monitor the INT pin. Read the INT_STAT register and
IN_STATE_COMP register to make sure the correct switch status is reported.
10.2.3 Application Curves
Figure 42 is the scope shot showing the switch getting toggled from close to open at time a). Before toggling, the
voltage at V_IN0 stays low at roughly 2.7 V. Once the switch opens, the voltage at V_IN0 gets pulled high to the V_S
voltage. The INT pin is asserted shortly after the switch toggles at time b) to notify the microcontroller an switch
state change event has occurred.
Figure 42. Measured Waveform Showing V_IN0 Pin and INT Pin Voltages
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