CPU manager

Features 200MS power-power reset latency low VCC detection and reset assertation-five standard reset threshold voltage-use special programming order adjust the low VCC reset threshold voltage- The reset signal is valid to VCC 1V optional non-easy-to-lose sexual watch dog-0.2, 0.6, 1.4 seconds-Close selection-through software selecting long battery life, low power consumption- lt; 50 Mi'an's maximum machine current, watch the door dog open- lt; 1 Wei'an maximum machine current, watch the door dog closed 2.7V to 5.5V operations SPI mode 0 interface built-in accident writing Putting Protection-Electricity/Power-off Protection Circuit-See Dog Change High reliability can be packaged-8 guide TSSOP-8 guide SOIC-8-needle pdip

Explain this description The device will integrate three common functions, power -on reset, watch dog timer and power supply voltage monitoring in a software package. This combination reduces system costs, reduces the demand for board space, and improves reliability. Seeing dog timer provides an independent protection mechanism for the microcontroller. During the system failure, the device will respond with reset signal after the optional super time interval. The user selects the interval from the three preset values. Once selected, the interval will not change even after the circulation is powered. The low -VCC detection circuit protection user system of the device is exempted from the effects of low voltage conditions. When VCC is lower than the minimum VCC trigger point, the system resets. Before the VCC is restored to the normal working level and stable, the assertion is reset. There are five industry standard VTRIP thresholds available, but the unique circuit of Intersil allows re -programming thresholds to meet the custom requirements, or fine -tuning threshold for applications that require higher accuracy.

Working principle

Powering and resetting to x5001 Electricity will activate the power -to -reset circuit. The circuit is activated at 1V and activates the reset/reset pin. This signal prevents the system microprocessor start working before the voltage is insufficient or the oscillator is stable. When V exceeds the device VFOR 200MS (nominal), the circuit is released to reset, allowing the processor to start executing the code.

Low -voltage monitoring

During the operation, X5001 monitors V level. If the power supply voltage is lower than the minimum of preset V, the reset is asserted. The reset signal prevents microprocessors from working in a state of power off or power off. The reset signal remains activated until the voltage drops below 1V. It also remains activated until VCC returns and exceeds VRen to 200ms.

Looking at the door dog timer

Watch the door dog timer circuit monitor the activity of microprocessor by monitoring WDI input. The microprocessor must regularly switch the CS/WDI pins to prevent reset signals. Before watching the door dog's time limit expires, it mustCS/WDI's foot must be switched from high to low. Two non -susceptible control positions in the door dog register determine the cycle of watching the door dog timer.

VCC threshold resetting program

X5001 with a standard V threshold (V) voltage when the factory leaves the factory. This value will not change under normal operation and storage conditions. However, in an incomplete application of standard V, or if the V value requires higher accuracy, the X5001 threshold can be adjusted. The procedure is described below to apply high -pressure control signals.

Set V voltage travel

This program is used to set V to higher voltage values. For example, if the current V is 4.4V and the new V is 4.6V, the process will be changed directly. If the new settings should be lower than the current settings, you need to reset the trigger point before setting the new value.

To set a new V voltage, apply the required VTHRESHOLD voltage to the V pins, and connect the W pins to programming voltage V. Then send the V programming command sequence to the device via the SPI interface. This V programming sequence includes pulling down CS, and then scheduled in the data 03h, 00h and 01H. Then adjust the CS and lower it, and the time time (in order) in the data 02H, 00h, and 01H and increase the CS. This will start the V programming sequence.

Reset V voltage travel

This program is used to set V to the voltage level of This machine ". For example