XC6123A743MR-G

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The purpose of power Management IC (PMIC) devices is to provide a reliable, efficient, and cost-effective solution for managing the power management needs of complex systems. Supervisors provide a tightly-coupled monitoring and protection system for preventative system integrity for various supply rails. An example is the XC6123A743MR-G supervisor chip from Toshiba, which is designed for mobile applications, where the constraints of size, complexity, and power consumption are challenges. This article examines the applications and working principles of the XC6123A743MR-G.

The XC6123A743MR-G supervisor chip is designed to provide protection and supervision for extremely low power applications, such as mobile handhelds, mobile phones and 3G/4G communication systems. It is built on Toshiba’s advanced BiCMOS technology to provide reliable, accurate monitoring and protection of multiple power rails. The XC6123A743MR-G features include two voltage supervisor inputs and one output, two manual reset inputs, an watchdog timer, power-on reset, and a low power sleep mode. This makes it ideal for monitoring voltage levels, protecting against out-of-specification voltage transients, detecting system lockup conditions, and providing reliable system reset.

The XC6123A743MR-G provides two types of supervisor inputs. The first is a positive-going supervisory signal that is used to monitor the voltage level of the power rail. The supervisor signal voltage is compared to two user-defined threshold levels. If the monitored signal is higher than the high threshold, a reset signal will be issued. Additionally, if the monitored signal drops below the low threshold, a reset signal will be issued as well. This provides a reliable way to protect the system from out-of-specification transients, such as brown-outs or over-voltages.

The second type of supervisor input is a negative-going supervisory signal. This is used to detect a system lock-up condition, in which the processor fails to reset itself and hangs. When the negative-going signal is detected, the XC6123A743MR-G will issue a reset signal, forcing the processor to re-initialize. This is a critical feature for applications such as mobile phones and 3G/4G communication systems, which must remain operational despite occasional system anomalies.

The XC6123A743MR-G also features a watchdog timer, which can be used to detect any system hang conditions that might occur due to software bugs or irregularities. The watchdog timer is user-programmable and provides a period of time in which to detect a system hang condition. If a system hang condition is detected, the XC6123A743MR-G will issue a reset signal to the processor, forcing it to re-initialize.

Additionally, the XC6123A743MR-G includes a manual reset input. This provides a direct connection to a processor reset pin, allowing the user to manually reset the processor in the event of a system hang. The XC6123A743MR-G also provides a low-power sleep mode for power-critical applications, which helps to reduce power consumption during periods of inactivity.

In summary, the XC6123A743MR-G supervisor chip from Toshiba is an ideal solution for monitoring and protecting power rails in power-sensitive applications such as mobile phones and 3G/4G communication systems. It provides reliable, efficient monitoring and protection of multiple supply rails and features two types of supervisor inputs, a watchdog timer, power-on reset, and a low-power sleep mode. The XC6123A743MR-G is designed to provide reliable, cost-effective power management solutions for complex systems.

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