MAX691CPE

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The MAX691CPE is a supervisor chip from a family of MAXIM Integrated Products specifically designed to manage system power sequencing and reset signals in power supply applications. Through the use of voltage monitoring, the MAX691CPE can provide additional safety and reliability for the system by detecting power supply conditions that can cause a system failure.

The MAX691CPE application field includes various areas such as computers, automotive, telecom, power electronics, server and mainframe applications. The chip can be used to monitor battery/supercap/flyback power supplies and reduce system power-on surge. It features watchdog timer, adjustable reset voltage and timeout, and adjustable reset push-pull/open-drain options. In addition, the MAX691CPE offers adjustable active-low and active-high reset threshold voltages, adjustable reset timeouts ranging from milliseconds to over 50 minutes, and both open-drain push-pull reset outputs.

The working principle of the MAX691CPE is quite simple. The chip uses voltage monitoring to detect power supply conditions that can lead to a system failure, and then outputs a signal to indicate that the system needs to be reset. This is done by monitoring the primary supply voltage, which is typically the main power supply voltage of the system. The MAX691CPE monitors the input voltage of the supply and compares it to an adjustable reset threshold voltage. If the input voltage drops below the reset threshold voltage, then the MAX691CPE will output a reset signal to the system, which forces the system to reset.

The MAX691CPE also features a watchdog timer, which is used to detect system failures when the input voltage is below the reset threshold voltage. The watchdog timer is a time-based circuit that will force the system to reset if the input voltage remains below the reset threshold voltage for more than a specified amount of time. The watchdog timer can be configured to reset the system after a certain amount of time, and this can be set by programming the MAX691CPE.

Additionally, the MAX691CPE has adjustable reset push-pull/open-drain options. Push-pull reset signals are active-low reset signals that can be used to force a system to reset quickly and reliably; this is done by connecting the reset pin of the chip to the reset pin of the system. Open-drain reset signals, on the other hand, are active-high signals that can be used to reset the system more slowly, as the signal must travel through the entire system before it reaches the reset pin of the system.

In summary, the MAX691CPE is a power management chip designed to manage system power sequencing and reset signals in power supply applications. It can help ensure system reliability by monitoring the primary supply voltage, detecting power supply conditions that can cause a system failure, and providing adjustable push-pull/open-drain reset outputs. These features make the MAX691CPE an ideal choice for applications such as computers, automotive, telecom, power electronics, server and mainframe applications.

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