DS1238-5

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PMIC supervisors are integrated circuits that monitor system conditions such as power supply voltage levels and system temperature. When any of these conditions exceed predetermined thresholds, the supervisor IC will signal the system to initiate corrective or preventive action. The DS1238-5 is one such PMIC supervisor that was introduced by Dallas Semiconductor (now Maxim), offering excellent accuracy and superior system monitoring capabilities to detect low power conditions. It serves as a complementary product to their more popular DS1238-3 and DS1238-4 series.

In addition to its superior accuracy, the DS1238-5 also features a wide reset assertion range of 2.2 V to 5.9 V and a reset assertion time of less than 1 ms. It also offers extended temperature range of −40°C to +125°C, making it an excellent choice for operation in industrial and automotive environments. The reset signal is delivered to the host microcontroller or processor via a single Status bit that can be read over an I2C or SMBus interface.

The DS1238-5 is used as an automotive-grade power-fail supervisor/reset IC. It monitors the power supply by checking the voltage level and monitoring the temperature. In case of a power failure, it will signal the system to take preventive or corrective action. The reset signal is delivered to the host microcontroller or processor via a single status bit, which can be read over the I2C or SMBus interface. The device also provides an adjustable reset assertion threshold, programmable reset assertion delay, and programmable power-on reset pulse width.

The main application field for the DS1238-5 is in automotive, aerospace and medical equipment, as a reliable and accurate power-fail supervisor/reset IC. It can be used to monitor the power supply, temperature and other parameters to ensure safe and reliable operation. The DS1238-5 also offers an adjustable reset assertion threshold, programmable reset assertion delay, and programmable power-on reset pulse width, making it an ideal choice for automotive applications.

The working principle of the DS1238-5 power-fail supervisor is quite simple. It compares the voltage level of the power supply constantly against its predetermined threshold. The threshold can be programmed through the serial interface. If the power supply voltage drops below the threshold, the device will signal the system to shut down or take corrective action before the power failure happens. In case of a power-fail event, the DS1238-5 will issue a reset signal with an adjustable pulse width. The pulse width can also be programmed with the serial interface.

The DS1238-5 offers excellent accuracy and superior system monitoring capabilities to prevent system faults from happening. It is also a robust and cost-effective device, making it a popular choice for automotive, aerospace and medical applications where reliability and accuracy is of utmost importance.

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