COUNTERS I2C

Two components DS6182 sharing the I2C bus through the switch TCA9543A.

DS1682:

The DS1682 is an integrated elapsed-time recorder containing a factory-calibrated, temperature-compensated RC time base that eliminates the need for an external crystal. Using EEPROM technology to maintain data in the absence of power, the DS1682 requires no backup power source. The DS1682 detects and records the number of events on the EVENT pin and the total cumulative event time since the DS1682 was last reset to 0. The ALARM pin alerts the user when the total time accumulated equals the user-programmed alarm value. The polarity of the open-drain ALARM pin can be programmed to either drive low or to become high impedance upon an alarm condition. The DS1682 is ideal for applications that monitor the total amount of time that a device has been in operation and/or the number of uses since inception of service, repair, or the last calibration.

Features:

• Records the Total Time That the Event Input Has Been Active and the Number of Events That Have Occurred
• 32-Bit, Nonvolatile, Elapsed Time Counter (ETC) Monitors Event Duration with Quarter-Second Resolution and Provides 34 Years of Total Time Accumulation
• Programmable Elapsed Time ALARM Output
• Nonvolatile, 17-Bit Event Counter Records the Total Number of Times an Event has Occurred
• Calibrated, Temperature-Compensated RC Time Base Accurate to 2% Typical
•  10 Bytes of EEPROM User Memory
• Write Disable Function to Prevent the Memory from Being Changed or Erased
• 2-Wire Serial Communication
• Wide 2.5V to 5.5V Power-Supply Range
• Useful in Time-of-Use Warranty, Calibration, Repair, and Maintenance Applications

TCA9543APWR:

The TCA9543A is a dual bidirectional translating switch controlled by the I 2C bus. The SCL/SDA upstream pair fans out to two downstream pairs, or channels. Either individual SCn/SDn channel or both channels can be selected, determined by the contents of the programmable control register. Two interrupt inputs (INT1–INT0), one for each of the downstream pairs, are provided. One interrupt output (INT) acts as an AND of the two interrupt inputs. An active-low reset (RESET) input allows the TCA9543A to recover from a situation where one of the downstream I 2C buses is stuck in a low state. Pulling RESET low resets the I 2C state machine and causes both of the channels to be deselected, as does the internal power-on reset function. The pass gates of the switches are constructed such that the VCC terminal can be used to limit the maximum high voltage, which will be passed by the TCA9543A. This allows the use of different bus voltages on each pair, so that 1.8-V, 2.5-V, or 3.3-V parts can communicate with 5-V parts without any additional protection. External pull-up resistors pull the bus up to the desired voltage level for each channel. All I/O terminals are 5.5-V tolerant.

Features:

• 1-of-2 Bidirectional Translating Switches
• I2C Bus and SMBus Compatible
• Two active-low interrupt inputs
• Active-low interrupt output
• Active-low reset input
• Two address pins allowing up to four TCA9543A devices on the I2C bus
• Channel selection via I2C bus, in any combination
• Power-up with all switch channels deselected
• Low RON switches
• Allows voltage-level translation between 1.8-V, 2.5-V, 3.3-V, and 5-V buses
• No glitch on power-up
• Supports hot insertion
• Low standby current
• Operating power-supply voltage range of 1.65-V to 5.5-V
• 5.5-V Tolerant inputs
• 0 to 400-kHz Clock frequency
• Latch-up Performance exceeds 100-mA Per JESD78
• ESD Protection exceeds JESD 22
  • 4000-V Human-body model (A114-A)
  • 1500-V Charged-device model (C101)