TIC10024-Q1 Datasheet, PDF (17/81 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
Feature Description (continued)
8.3.8 Switch Inputs Settings
IN0 to IN23 are inputs connected to external mechanical switches. The switch status of each input, whether open
or closed, is indicated by the status registers. Table 1 below describes various settings that can be configured for
each input. Note some settings are shared between multiple inputs. It is required to first stop device operation by
setting the TRIGGER bit low in the register CONFIG before making any configuration changes, as described in
Device Trigger.
Input
IN0
IN1
IN2
IN3
IN4
IN5
IN6
IN7
IN8
IN9
IN10
IN11
IN12
IN13
IN14
IN15
IN16
IN17
IN18
IN19
IN20
IN21
IN22
IN23
Table 1. TIC10024-Q1 Wetting Current and Threshold Setting Details
Threshold
THRES_COMP_IN0_IN3
THRES_COMP_IN4_IN7
Wetting Current
WC_IN0_IN1
WC_IN2_IN3
WC_IN4
WC_IN5
WC_IN6_IN7
THRES_COMP_IN8_IN11
THRES_COMP_IN12_IN15
THRES_COMP_IN16_IN19
THRES_COMP_IN20_IN23
WC_IN8_IN9
WC_IN10
WC_IN11
WC_IN12_13
WC_IN14_15
WC_IN16_17
WC_IN18_19
WC_IN20_21
WC_IN22
WC_IN23
Current Source (CSO) / Current
Sink (CSI)
CSO
CSI
CSO
CSI
CSO
CSI
CSO
CSI
CSO
CSI
CSO
CSI
CSO
CSI
CSO
CSI
CSO
CSI
CSO
CSI
CSO
CSO
CSO
CSO
CSO
CSO
CSO
CSO
CSO
CSO
CSO
CSO
CSO
CSO
Supported Switch Type
Switch to GND
Switch to VBAT
Switch to GND
Switch to VBAT
Switch to GND
Switch to VBAT
Switch to GND
Switch to VBAT
Switch to GND
Switch to VBAT
Switch to GND
Switch to VBAT
Switch to GND
Switch to VBAT
Switch to GND
Switch to VBAT
Switch to GND
Switch to VBAT
Switch to GND
Switch to VBAT
Switch to GND
Switch to GND
Switch to GND
Switch to GND
Switch to GND
Switch to GND
Switch to GND
Switch to GND
Switch to GND
Switch to GND
Switch to GND
Switch to GND
Switch to GND
Switch to GND
8.3.8.1 Input Current Source/Sink Selection
Among the 24 inputs, IN10 to IN23 are intended for monitoring only ground-connected switches and are
connected to current sources. IN0 to IN9 can be programmed to monitor either ground-connected switches or
battery-connected switches by configuring the CS_SELECT register. The default configuration of the IN0-IN9
inputs after POR is to monitor ground-connected switches (current sources are selected). To set an input to
monitor battery-connected switches, set the corresponding bit to logic 1.
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