ISL12022M EEPROM Recall Procedure
The ISL12022M device is a high-accuracy, temperature compensated Real Time Clock (RTC). An internal temperature sensor and state machine adjust the oscillator frequency to keep error less than ±5ppm. Most of the registers in the device are RAM-based, read and writable by a microcontroller. There are also compensation registers which have a special setup.
The compensation registers are EEPROM-based, and recalled into RAM for use by the state machine. They are programmable only during factory test, no other programming of these EEPROM registers is possible. The RAM mirror registers are accessible, however, with two different types. One type is readable by the user during normal operation, but not writable. These are in the control registers and contain initial calibration values for the crystal oscillator frequency compensation. The other type of register is for internal test and calibration of voltage references, A/D converter, and temperature sensor. These registers are locked and are normally not accessible by the user.
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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November 2, 2011 |
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Rev 0.00 |
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AN1709 |
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473 KB |
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