Tuesday, April 16, 2024

Analog Switches To Monitor & Protect 1.8 V Electronic Systems

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The series of 4- and 8-channel analogue switches are designed for monitoring and protecting 1.8 V systems, suitable for automotive, consumer, and industrial applications.

Analog switches

Nexperia has launched a new series of 4- and 8-channel analogue switches, the NMUX1308 and NMUX1309, for monitoring and protecting 1.8 V electronic systems. These switches are designed for automotive, consumer, and industrial applications, including sensor monitoring, diagnostics, and computing. They are suitable for use in automotive sensor monitoring, domestic appliances, and other electronic systems requiring reliable protection.

Typically, analogue switches require extra voltage translators due to the inability of the control circuitry to operate at the power supply voltage level of the switch. However, the switches have control pins that function independently of their power supply voltage range, eliminating the need for additional level-shifting components and thus saving space on the board and reducing costs.

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The company claims to offer several features in the series of switches to enhance system safety. The fail-safe logic allows control pins to be biased before the system powers up and to remain biased even after the system has powered down, removing the need for power sequencing between the analogue switch and the microcontroller unit (MCU). Additionally, a power-off protection feature enables analog pins to be biased before system power-up and to stay biased after system power-down, eliminating power sequencing restrictions for the analog switch and various power rails supporting analog signals and ADC circuitry further down the signal chain. The integration of both features in the series prevents back-powering of the supply rail through any pin of the analogue switch.

These devices also incorporate injection current control circuitry, limiting output voltage shifts on the active channel to less than 5 mV during an overvoltage event on disabled signal channels. This removes the necessity for external diode and resistor networks, thereby saving board space and reducing costs. The switches come in leaded and leadless options, including a leadless package that supports Automated Optical Inspection (AOI) for automotive applications.

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