Introduction to Multi switch detection interface ICs
A Multi switch detection interface ICs is a specialized integrated circuit developed for detecting signals from multiple switches. It is capable of simultaneously connecting to various input types including mechanical switches, touch switches, and proximity switches, consolidates and processes the switch status signals, and transmits the processed results to the main control unit. This design simplifies circuit layout and effectively reduces the I/O resource load of the host device.
These Multi switch detection interface ICs can support 8, 16, or more switch inputs simultaneously, and are compatible with both normally open (NO) and normally closed (NC) switch configurations. They can automatically detect the on/off status of each input channel, eliminating the requirement for the host unit to poll each channel individually, which in turn reduces the consumption of the host's processing resources.
Built-in hardware debouncing circuitry is integrated to filter out signal noise generated during the opening or closing of mechanical switches. This guarantees stable and reliable output of switch status signals, and effectively prevents false trigger detection.
These devices convert multiple parallel switch signals into standardized interface outputs, such as I2C, SPI, or UART, enabling direct compatibility with the communication interfaces of mainstream microcontrollers (MCUs) and reducing the demand for additional peripheral components.
Most MSDI ICs are equipped with a low-power sleep mode, which automatically reduces power consumption when no switch activity is detected, making them suitable for power-sensitive applications including battery-powered portable devices and IoT sensor nodes.
Specific part numbers for Multi-Switch Detection Interface (MSDI) ICs
The TIC12400 is an advanced Multi-Switch Detection Interface (MSDI) device developed for monitoring the status of external switches. It supports 24 direct input channels, among which 10 channels can be configured to monitor digital I/O switches. Each input provides six programmable wetting current settings to meet the requirements of different application scenarios. The TIC12400 adopts an integrated 10-bit ADC to monitor multi-state analog switches, and uses independent comparators to monitor digital switches without relying on the MCU. It supports wake-up function for all switch inputs, eliminating the necessity of keeping the MCU active continuously, thereby reducing overall system power consumption. This device supports two working modes: continuous mode and polling mode. In continuous mode, wetting current is provided continuously. In polling mode, wetting current is applied periodically according to a programmable timer to sample input status, which significantly reduces system power consumption. The TIC12400 also integrates a variety of fault detection and diagnostic functions to improve system stability and reliability.
Multi-Switch Detection Interface (MSDI) IC Parameters
The Multi switch detection interface ICs parameters are as follows:
|
Number of input channels |
24 |
|
Operating voltage (min) (V) |
6.5 |
|
Operating voltage (max) (V) |
24 |
|
Input/output voltage (max) (V) |
40 |
|
Input/output voltage (min) (V) |
-24 |
|
IO current (mA) |
1, 2, 5, 10, 15 |
|
Operating temperature range (°C) |
-40 to 105 |
|
Interface type |
SPI |
|
Features |
Configurable wetting current, Integrated 10-bit ADC, Interrupt wake-up operation, Overvoltage warning, Polling mode, SPI, Undervoltage warning, Withstands load dump condition and reverse polarity condition |
|
Diagnostics |
ADC self-diagnostic, Wetting current diagnostic |
|
Logic voltage (min) (V) |
3 |
|
Logic voltage (max) (V) |
5.5 |
|
Rating |
Catalog |
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