DS1678+ Maxim Integrated Products, DS1678+ Datasheet - Page 10

• Manufacturer Part Number: DS1678+
• Description: IC REAL TIME EVENT REC 8-DIP
• Manufacturer: Maxim Integrated Products
• Type: Time Event Recorderr

Specifications of DS1678+

• Memory Size: 32B
• Time Format: HH:MM:SS (12/24 hr)
• Date Format: YY-MM-DD-dd
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The user can write only to the RTC, control registers, and user NV RAM. The rest of the memory map is
read-only from the user’s perspective. During an event-log mission, all the memory is read-only. A write
terminates the mission. If there is an event being recorded when the mission is terminated, the event
finishes being recorded before the mission is stopped, and the values in the MIP and ME bits do not
change to zeros until the mission is complete.
During an event-log mission, memory locations 30h and above are not accessible to the user to avoid data
collisions from a user read and an event being logged at the same time. If the user tries to read a location
with an address greater than 2Fh during a mission, the value returned is 00h.
Table 3. DS1678 Event Elapsed Time Duration
ADDRESS REGISTE
07FD
07FB
07FC
07FE
07FF
0000
0001
0002
0003
0004

Event 1 Elapsed Time from Last Event Counter LSB
Event 1 Elapsed Time from Last Event Counter MSB
Event 2 Elapsed Time from Last Event Counter LSB
Event 2 Elapsed Time from Last Event Counter MSB
Event 1023 Elapsed Time from Last Event Counter LSB
Event 1023 Elapsed Time from Last Event Counter MSB
Event 1024 Elapsed Time from Last Event Counter LSB
Event 1024 Elapsed Time from Last Event Counter MSB

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