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DS1683S+ Datasheet(PDF) 8 Page - Maxim Integrated Products |
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DS1683S+ Datasheet(HTML) 8 Page - Maxim Integrated Products |
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8 / 21 page  8 DS1683 Total-Elapsed-Time and Event Recorder with Alarm Event Logging When the DS1683 is powered up, the internal oscilla- tor starts; the ETC and Event Counter values, which are recorded in the shadowed EEPROM bank memory, are transferred to the ETC and Event Counter SRAM loca- tions; and the device waits for an event (rising edge of the EVENT signal). When an event triggers the input by transitioning the EVENT pin from a low to a high level, the following occur: 1) The ETC and Event Counter values are once again transferred from shadowed EEPROM bank memory to their SRAM counter locations. 2) After the glitch filtering and tEI, the ETC SRAM counter value increments. See Figure 2 for timing. An event greater than time event minimum (tG) but less than tEI (i.e., a low-high-low transition on EVENT < tEI) incre- ments the Event Counter SRAM value but not the ETC SRAM value. 3) The ETC SRAM value increments every tEI. The ETC SRAM counter holds time in quarter-second resolution. 4) When the EVENT pin goes low, the Event Counter SRAM value increments by one, the ETC SRAM coun- ter stops incrementing, and the values from the ETC and Event Counter SRAM locations are transferred to their Shadowed EEPROM counterparts. The I2C bus is not available for tW. The ETC value does not roll over when FFFFFFFFh, or approximately 34 years, is reached. The Event Counter value does not roll over when reaching a value of FFFFh. While the EVENT pin is high, I2C write commands are ignored, though I2C read commands are still possible. Password Protection From the factory, the DS1683 powers up without pass- word protection enabled. The intent is to provide a manufacturer an optional security feature to protect the Configuration register, Alarm registers, User EEPROM, ETC and Event Counter settings, and the Password Value (PWV). The customer is not able to alter the Configuration register, Alarm registers, ETC or Event Counter, User EEPROM or Password Value settings if the password conditions are not met. The DS1683 password is stored in the 4-byte read- only Password Value register, located at 1Ah–1Dh. The default value for this register is FFFFFFFFh. To change this value, a 4-byte I2C write command must be issued. The 4 bytes of the new password must be issued with the same I2C write command. Once the STOP of the I2C write command is issued, the Password Value register is updated with the new 4-byte value. The Password Entry bytes (PWE) are where the user enters the 4-byte password to unlock access to the DS1683’s EEPROM locations. When writing the PWE value, the user must issue a 4-byte I2C write command starting at location 02h. This 4-byte value must match the 4-byte Password Value stored in registers 1Ah–1Dh. Figure 2. Event Input Timing INTERNAL EVENT CLOCK tG tEI EVENT INPUT |
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Similar Description - DS1683S+ |
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