DS1819CR-5+T&R

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Introduction

The DS1819CR-5+T&R Supervisors represents one of the latest in the PMIC supervision and protection family from Texas Instruments. It has a unique feature set, which includes a low dropout (LDO) voltage regulator, an adjustable watchdog timer (WDT) with a reset pulse width, a programmable input voltage threshold, and an adjustable reset alarm with an alarm assert interval. This supervisor provides an integrated solution to PMIC monitoring and protection functions, making it an ideal solution for several market segments and applications.

Application Field

The DS1819CR-5+T&R Supervisors provide a complete protection and supervision solution for various PMIC applications. It is ideal for use in white goods, power supplies, industrial equipment, automotive applications, and embedded systems. The adjustable watchdog timer and programmable input voltage threshold makes it suitable for systems with multiple power rails, where the output voltage can vary depending on the application and environment.

For automotive applications, the LDO module can provide constant input voltage to help prevent system errors and shutdowns due to voltage transients such as those from an alternator. Moreover, the adjustable reset alarm can provide reassurance that the system is running normally by generating a periodic diagnostic signal to check for system integrity.

For embedded systems, the adjustable WDT and input voltage threshold can help maintain the reliability of the system over a wide range of environmental conditions. The LDO provides constant input voltage even under fluctuating conditions, helping to increase system performance and reduce the risk of reset due to negative voltage conditions.

Working Principle

The DS1819CR-5+T&R Supervisors monitor the input voltage and WDT status, and provide an adjustable reset pulse as output. The input voltage is monitored by the Comparing Detector (CD), which compares the internal reference voltage to the input voltage. If the input voltage is below the set threshold for a specified amount of time, the CD will trigger the reset output. The WDT is an interval timer, which can be programmed to generate a reset pulse if the system is idle or not responding within the set time interval.

The adjustable reset alarm is used to generate a diagnostic signal to detect any abnormal conditions or faults in the system. It is typically used in automotive applications to detect any error conditions, such as short-circuit, over-temperature, or over-current protection. The reset alarm can be programmed to generate an alarm signal at a user-specified interval, helping to diagnose any system problems before they can cause major damage.

Additionally, the DS1819CR-5+T&R Supervisor includes an internal LDO voltage regulator to provide a constant input voltage. The LDO provides a stable voltage source to the system, regardless of the input voltage fluctuations, and helps minimize any reset due to negative voltage conditions.

Conclusion

The DS1819CR-5+T&R Supervisors provide a feature-rich solution for PMIC supervision and protection. It is ideal for white goods, power supplies, automotive, and embedded applications, thanks to its adjustable reset pulse width, adjustable watchdog timer, programmable input voltage threshold, and adjustable reset alarm. Furthermore, its integrated LDO voltage regulator helps provide a constant input voltage, despite fluctuations in the input voltage.

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