DS1210 DATASHEET PDF

Muktilar Each time that the circuit is. Figure 1 shows a typical application incorporating datwsheet DS in a microprocessor-based system. Provides for Redundant Batteries. I CC02 is the maximum average load current which the DS can supply to the memories in daasheet. Measured with a load as shown in Figure 2.

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First, a switch is provided to direct power from the battery or the incoming supply VCCI depending on which is greater. This switch has a voltage drop of less than 0. The second function which the nonvolatile controller provides is power-fail detection. The DS constantly monitors the incoming supply. When the supply goes out of tolerance, a precision comparator detects power-fail and inhibits chip enable CEO.

The third function of write protection is accomplished by holding the CEO output signal to within 0. The delay of write protection until the current memory cycle is completed prevents the corruption of data. Power-fail detection occurs in the range of 4. The fourth function the DS performs is a battery status warning so that potential data loss is avoided. Each time that the circuit is powered up the battery voltage is checked with a precision comparator. If the battery voltage is less than 2.

Battery status can, therefore, be determined by performing a read cycle after power-up to any location in memory, verifying that memory location content. A subsequent write cycle can then be executed to the same memory location altering the data. If the next read cycle fails to verify the written data, then the batteries are less than 2.

The fifth function of the nonvolatile controller provides for battery redundancy. In many applications, data integrity is paramount. In these applications it is often desirable to use two batteries to ensure reliability. The DS controller provides an internal isolation switch which allows the connection of two batteries. During battery backup operation the battery with the highest voltage is selected for use. If one battery should fail, the other will take over the load.

The switch to a redundant battery is transparent to circuit operation and to the user. A battery status warning will occur when the battery in use falls below 2. A grounded VBAT2 pin will not activate a battery-fail warning. In applications where battery redundancy is not required, a single battery should be connected to the BAT1 pin, and the BAT2 battery pin must be grounded.

The nonvolatile controller contains circuitry to turn off the battery backup. This is to maintain the battery s at its highest capacity until the equipment is powered up and valid data is written to the SRAM. Figure 1 shows a typical application incorporating the DS in a microprocessor-based system.

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DS1210 DATASHEET PDF

First, a switch is provided to direct power from the battery or the incoming supply VCCI depending on which is greater. This switch has a voltage drop of less than 0. The second function which the nonvolatile controller provides is power-fail detection. The DS constantly monitors the incoming supply. When the supply goes out of tolerance, a precision comparator detects power-fail and inhibits chip enable CEO. The third function of write protection is accomplished by holding the CEO output signal to within 0. The delay of write protection until the current memory cycle is completed prevents the corruption of data.

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Voltage on Any Pin Relative to Ground. DS 8-pin DIP mil. Unused battery inputs must be grounded. The second function which the. Tests Battery Condition on Power up. CEO will follow CE with a maximum propagation delay of 20ns. The delay of write protection until.

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