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TIC12400-Q1 Datasheet(PDF) 20 Page - Texas Instruments |
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TIC12400-Q1 Datasheet(HTML) 20 Page - Texas Instruments |
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20 / 127 page  20 TIC12400-Q1 SCPS260 – AUGUST 2017 www.ti.com Product Folder Links: TIC12400-Q1 Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated Feature Description (continued) Table 1. TIC12400-Q1 Wetting Current and Threshold Setting Details (continued) Input Threshold Wetting Current Current Source (CSO) / Current Sink (CSI) Supported Switch Type Comparator Input Mode ADC Input Mode IN20 THRES_COMP_IN 20_IN23 THRES3A THRES3B THRES3C WC_IN20_21 CSO Switch to GND IN21 THRES3A THRES3B THRES3C CSO Switch to GND IN22 THRES3A THRES3B THRES3C WC_IN22 CSO Switch to GND IN23 THRES3A THRES3B THRES3C THRES8 THRES9 WC_IN23 CSO 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. 8.3.8.2 Input Mode Selection The TIC12400-Q1 has a built-in ADC and a comparator that can be used to monitor resistor coded switches or digital switches. Digital switch inputs have only two states, either open or closed, and can be adequately detected by a comparator. Resistor coded switches may have multiple positions that need to be detected and an ADC is appropriate to monitor the different states. Each input of the TIC12400-Q1 can be individually programmed to use either a comparator or an ADC by configuring the appropriate bits in the MODE register depending on the knowledge of the external switch connections. The benefit of using a comparator instead of an ADC to monitor digital switches is its reduced polling time which translates to overall power saving when the device operates in the low-power polling mode. Comparator input mode is selected by default for all enabled inputs upon device reset. 8.3.8.3 Input Enable Selection The TIC12400-Q1 provides switch status monitoring for up to 24 inputs, but there might be circumstances in which not all inputs need to be constantly monitored. The microcontroller may choose to enable/disable monitoring of certain inputs by configuring the IN_EN register. Setting the corresponding bit to logic 0 de- activates the wetting current source/sink and stops switch status monitoring for the input. Disabling monitoring of unused inputs reduces overall power consumption of the device. All inputs are disabled by default upon device reset. |
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