ZSSC3122 Datasheet

© 2016 Integrated Device Technology, Inc.

4

January 25, 2016

4

Command Mode ............................................................................................................................................. 41

4.1

Command Format.................................................................................................................................... 41

4.2

Command Encodings .............................................................................................................................. 41

4.3

Command Response and Data Fetch ..................................................................................................... 42

5

EEPROM ........................................................................................................................................................ 45

5.1.1

IDT Configuration Register (IDT_Config, EEPROM Word 02HEX) .................................................... 47

5.1.2

Capacitance Analog Front End Configuration (C_Config, EEPROM Word 06HEX)........................... 48

5.1.3

Temperature Analog Front End Configuration (T_Config, EEPROM Word 11HEX) .......................... 49

5.1.4

Customer Configuration Register (Cust_Config, EEPROM Word 1CHEX) ........................................ 50

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Calibration and Signal Conditioning Math ...................................................................................................... 51

6.1

Capacitance Signal Conditioning ............................................................................................................ 51

6.2

Temperature Signal Compensation......................................................................................................... 52

6.3

Limits on Coefficient Ranges................................................................................................................... 53

7

Application Circuit Examples.......................................................................................................................... 54

7.1

Digital Output with Optional Alarms......................................................................................................... 54

7.2

Analog Output with Optional Alarms ....................................................................................................... 55

7.3

Bang-Bang Control System....................................................................................................................... 56

7.4

Differential Input Capacitance ................................................................................................................. 57

7.5

External Reference Capacitor ................................................................................................................. 58

8

ESD/Latch-Up-Protection ............................................................................................................................... 58

9

Pin Configuration and Package...................................................................................................................... 59

10 Test................................................................................................................................................................. 61

11 Reliability ........................................................................................................................................................ 61

12 Customization................................................................................................................................................. 61

13 Part Ordering Codes ...................................................................................................................................... 61

14 Related Documents........................................................................................................................................ 62

15 Glossary ......................................................................................................................................................... 62

16 Document Revision History ............................................................................................................................ 63

List of Figures

Figure 1.1

Best Case Settings (Typical Part)..................................................................................................... 11

Figure 1.2

Worst Case Settings (Typical Part) .................................................................................................. 11

Figure 1.3

Typical Current Consumption during Sleep Mode (No Measurements)........................................... 11

Figure 1.4

Output High Drive Strength Graph ................................................................................................... 12

Figure 1.5

Output Low Drive Strength Graph .................................................................................................... 12

Figure 1.6

First Order Fit (Typical Part) ............................................................................................................. 13

Figure 1.7

Second Order Fit (Typical Part) ........................................................................................................ 13

Figure 2.1

ZSSC3122 Block Diagram ................................................................................................................ 14

Figure 3.1

General Operation ............................................................................................................................ 21

Figure 3.2

Power-On Sequence with Fast Startup Bit Set in EEPROM ............................................................ 22

Figure 3.3

Measurement Cycle Timing ............................................................................................................. 23