ZSSC3123 Datasheet

© 2018 Integrated Device Technology, Inc.

5

August 16, 2018

Figure 8. Second Order Fit (Typical Part).........................................................................................................................................................15

Figure 9. ZSSC3123 Block Diagram.................................................................................................................................................................16

Figure 10. General Operation .............................................................................................................................................................................24

Figure 11. Power-On Sequence with Fast Startup Bit Set in EEPROM .............................................................................................................25

Figure 12. Measurement Cycle Timing...............................................................................................................................................................26

Figure 13. Measurement Sequence in Update Mode .........................................................................................................................................27

Figure 14. I2C and SPI Data Fetching in Update Mode......................................................................................................................................29

Figure 15. Measurement Sequence in Sleep Mode (Only I2C, SPI, or Alarms) .................................................................................................30

Figure 16. I2C and SPI Data Fetching in Sleep Mode........................................................................................................................................31

Figure 17. I2C Timing Diagram...........................................................................................................................................................................34

Figure 18. SPI Timing Diagram ..........................................................................................................................................................................35

Figure 19. I2C Measurement Packet Reads.......................................................................................................................................................36

Figure 20. SPI Output Packet with Positive Edge Sampling...............................................................................................................................37

Figure 21. I2C MR ..............................................................................................................................................................................................38

Figure 22. SPI MR ..............................................................................................................................................................................................38

Figure 23. Example of Alarm Function ...............................................................................................................................................................40

Figure 24. Alarm Output Flow Chart ...................................................................................................................................................................41

Figure 25. I2C Command Format .......................................................................................................................................................................42

Figure 26. Command Mode Data Fetch .............................................................................................................................................................45

Figure 27. Digital Output with Optional Alarms Example....................................................................................................................................55

Figure 28. Analog Output with Optional Alarms Example...................................................................................................................................56

Figure 29. Bang-Bang Control System Example ................................................................................................................................................57

Figure 30. Differential Input Capacitance Example ............................................................................................................................................58

Figure 31. External Reference Input Capacitance Example...............................................................................................................................59

List of Tables

Table 1. Pin Descriptions...................................................................................................................................................................................7

Table 2. Absolute Maximum Ratings.................................................................................................................................................................8

Table 3. Recommend Operating Conditions .....................................................................................................................................................9

Table 4. Electrical Characteristics ...................................................................................................................................................................10

Table 5. CDC Multiplier ...................................................................................................................................................................................19

Table 6. Mult 1: Sensor Capacitors Ranging from 2pF to 10pF (Full Scale Values) .......................................................................................20

Table 7. Mult 2: Sensor Capacitors Ranging from 8pF to 32pF (Full Scale Values) .......................................................................................20

Table 8. Mult 4: Sensor Capacitors Ranging from 32pF to 130pF (Full Scale Values) ...................................................................................21

Table 9. Mult 8: Sensor Capacitors Ranging from 130pF to 260pF (Full Scale Values) .................................................................................21

Table 10. CDC Resolution and Conversion Times............................................................................................................................................26

Table 11. Update Rate Settings (Power_Down_Period Bit Field in ZMDI_Config) ...........................................................................................27

Table 12. Time Periods between Capacitance and Temperature Measurements for Mult1, Different Resolutions, and Update Rates ...........28

Table 13. Time Periods between Capacitance and Temperature Measurements for Mult2, Different Resolutions, and Update Rates ...........28