DS1232LP+

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PMIC supervisors, like the DS1232LP+ from Maxim Integrated, exist for a number ofimportant reasons. They are widely used in various electronic applications to improvepower management and protect against power supply disturbances in the system. TheDS1232LP+ specifically is a highly integrated, dual-level supervisor IC with additionalfeatures for assisting power sequencing.

Application Field

The DS1232LP+ can help improve power management and reliability in varioussystems. It is well suited for use in computers, industrial controls, consumer products,telecommunications, medical electronics and automotive electronics. Some keyapplications include:

• Motherboard power control.
• Power supply sequencing and monitoring.
• Power supply failure protection.
• Memory management and protection.

The DS1232LP+ is designed to be easily incorporated into existing systems,with minimal changes required in order to integrate the system.

Working Principle

The DS1232LP+ is dual-level supervisor with two settings: a low voltage point and high voltage point. Both these points can be easily adjusted via an external resistornetwork, introducing flexibility for a variety of designs. For example, if the system isdesigned for a 3.3V power supply, then the supervisor can be adjusted to supply aslightly higher voltage for strong memory protection even during power supplytransitions.

The chip provides power-on reset and can detect low-voltage conditions on theVCC rail. It also has a watchdog timer which will reset the system if the timer runsout due to an unexpected failure. Additionally, the chip features latched shutdownwhen either of the low-voltage detect (LVD) and watchdog time-out functions is initiated.

The DS1232LP+ also features an adjustable delay circuit, helping with systemstartup time. This feature allows the delay to be set without any external components,which reduces the number of components in the circuit and eliminates the need totune other resistive networks.

The DS1232LP+ also integrates a watchdog timer, which is used to detect ahangup. The timer period is adjustable from 1000ms to 68secs. By setting the properwatchdog timeout, if a system hangs, the supervisor can be reset automatically,resulting in system restarts.

Conclusion

The DS1232LP+ from Maxim Integrated is an advanced, highly integrated, dual-levelsupervisor IC with adjustable delay for improved system startup. It offers improvedpower management and protection against power supply disturbances, helping toincrease the reliability of systems in computers, industrial controls, consumerproducts, telecommunications, medical electronics and automotive electronics.

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