ZSSC3122AI1B datasheet, PDF - EEWORLD Datasheet

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ZSSC3122AI1B: DescriptionWAFER (UNSAWN) - BOX; Categoryunclassified; File Size1MB，58 Pages; ManufacturerIDT (Integrated Device Technology, Inc.); Websitehttp://www.idt.com/

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cLite™ Low-Voltage Capacitive

Sensor Signal Conditioner

Brief Description

The ZSSC3122 is a CMOS integrated circuit for accurate

capacitance-to-digital conversion and sensor-specific correction of

capacitive sensor signals. Digital compensation of sensor offset,

sensitivity, and temperature drift is accomplished via an internal

digital signal processor running a correction algorithm with

calibration coefficients stored in a non-volatile EEPROM.

The ZSSC3122 is configurable for capacitive sensors with capaci-

tances up to 10pF and a sensitivity of 125aF/LSB. It is compatible

with both single capacitive sensors (both terminals must be

accessible) and differential capacitive sensors. Measured and

corrected sensor values can be output as I2C, SPI, PDM, or

alarms.

The I2C interface can be used for a simple PC-controlled cali-

bration procedure to program a set of calibration coefficients into

an on-chip EEPROM. The calibrated ZSSC3122 and a specific

sensor are mated digitally: fast, precise, and without the cost

overhead of trimming by external devices or laser.

ZSSC3122

Datasheet

Features



Maximum target input capacitance: 10pF



Sampling rates as fast as 0.7ms at 8-bit resolution;

1.6ms at 10-bit; 5.0ms at 12-bit; 18.5ms at14-bit



Digital compensation of sensor: piece-wise 1st and 2nd order

sensor compensation or up to 3

order single-region sensor

compensation



Digital compensation of 1st and 2nd order temperature gain

and offset drift



Internal temperature compensation reference

(no external components)



Programmable capacitance span and offset



Layout customized for die-die bonding with sensor for low-

cost, high-density chip-on-board assembly



Accuracy as high as ±0.25% FSO@ -20 to 125°C, 3V, 5V,

Vsupply ±10% (see data sheet section 1.3 for restrictions)



Minimized calibration costs: no laser trimming, one-pass

calibration using a digital interface



Excellent for low-power battery applications



Two interface options

Available Support



ZSSC3122 SSC Evaluation Kit available: SSC Evaluation

Board, samples, software, documentation.



Support for industrial mass calibration available.



Quick circuit customization option for large production

volumes.



Application Circuit:

Digital Output, Alarms

SUPPLY

(+1.8V to 5.5V)

I2C or SPI interface—easy connection to a microcontroller



PDM outputs (Filtered Analog Ratiometric) for both

capacitance and temperature

Up to two alarms that can act as full push-pull or open-drain

switches

Supply voltage: 1.8 to 5.5V

Typical current consumption 650μA down to 60μA depending

on configuration

Typical Sleep Mode current: ≤ 1μA at 85°C

Operation temperature: –20°C to +125°C

Die or TSSOP14 package



VDD

0.1µF

Vc ore

VSS

GND

ZSSC3122

Ready

SDA/MISO

SCL/SCLK

cLite

Alarm_High

Alarm_Low

June 8, 2018

ZSSC3122 Datasheet

Contents

Pin Assignments ...........................................................................................................................................................................................6

Pin Descriptions............................................................................................................................................................................................6

Absolute Maximum Ratings ..........................................................................................................................................................................7

Operating Conditions ....................................................................................................................................................................................7

Electrical Characteristics ..............................................................................................................................................................................8

Current Consumption Graphs .....................................................................................................................................................................11

6.1 Update Mode Current Consumption ..................................................................................................................................................11

6.2 Sleep Mode Current Consumption ....................................................................................................................................................11

Output Pad Drive Strength .........................................................................................................................................................................12

Temperature Sensor Nonlinearity ...............................................................................................................................................................13

Circuit Description ......................................................................................................................................................................................14

9.1 Signal Flow and Block Diagram .........................................................................................................................................................14

9.2 Analog Front-End ..............................................................................................................................................................................15

9.2.1

9.2.2

Capacitance-to-Digital Converter .......................................................................................................................................15

Temperature Measurement ................................................................................................................................................18

9.3 Digital Core ........................................................................................................................................................................................19

10. Normal Operation Mode .............................................................................................................................................................................20

10.1 Power-On Sequence .........................................................................................................................................................................21

10.2 Measurement Cycle...........................................................................................................................................................................21

10.3 Measurement Modes .........................................................................................................................................................................22

10.3.1

10.3.2

10.4.1

10.4.2

Update Mode ......................................................................................................................................................................22

Sleep Mode ........................................................................................................................................................................25

EEPROM Error Detection and Correction ..........................................................................................................................27

Alarm Diagnostics...............................................................................................................................................................27

10.4 Status and Diagnostics ......................................................................................................................................................................26

10.5 Output Modes ....................................................................................................................................................................................28

10.6 I2C and SPI .......................................................................................................................................................................................28

10.6.1

10.6.2

10.6.3

10.6.4

10.6.5

10.6.6

I2C Features and Timing ....................................................................................................................................................28

SPI Features and Timing ....................................................................................................................................................30

I2C and SPI Commands .....................................................................................................................................................30

Data Fetch (DF) ..................................................................................................................................................................31

Measurement Request (MR) ..............................................................................................................................................32

Ready Pin ...........................................................................................................................................................................33

10.7 PDM (Pulse Density Modulation) .......................................................................................................................................................33

10.8 Alarm Output .....................................................................................................................................................................................34

10.8.1

10.8.2

10.8.3

10.8.4

Alarm Registers ..................................................................................................................................................................35

Alarm Operation .................................................................................................................................................................35

Alarm Output Configuration ................................................................................................................................................36

Alarm Polarity .....................................................................................................................................................................36

June 8, 2018

ZSSC3122 Datasheet

11. Command Mode .........................................................................................................................................................................................37

11.1 Command Format..............................................................................................................................................................................37

11.2 Command Encodings ........................................................................................................................................................................38

11.3 Command Response and Data Fetch ...............................................................................................................................................38

12. EEPROM ....................................................................................................................................................................................................41

12.1 IDT Configuration Register (ZMDI_Config, EEPROM Word 02

HEX

)...................................................................................................43

12.2 Capacitance Analog Front-End Configuration (C_Config, EEPROM Word 06

HEX

) ............................................................................44

12.3 Temperature Analog Front-End Configuration (T_Config, EEPROM Word 11

HEX

)............................................................................45

12.4 Customer Configuration Register (Cust_Config, EEPROM Word 1C

HEX

)..........................................................................................46

13. Calibration and Signal Conditioning Math...................................................................................................................................................47

13.1 Capacitance Signal Conditioning .......................................................................................................................................................47

13.2 Temperature Signal Compensation ...................................................................................................................................................48

13.3 Limits on Coefficient Ranges .............................................................................................................................................................48

14. Application Circuit Examples ......................................................................................................................................................................49

14.1 Digital Output with Optional Alarms ...................................................................................................................................................49

14.2 Analog Output with Optional Alarms ..................................................................................................................................................50

14.3 Bang-Bang Control System ...............................................................................................................................................................51

14.4 Differential Input Capacitance ...........................................................................................................................................................52

14.5 External Reference Capacitor ...........................................................................................................................................................53

15. ESD/Latch-Up-Protection ...........................................................................................................................................................................54

16. Test.............................................................................................................................................................................................................54

17. Reliability ....................................................................................................................................................................................................54

18. Customization .............................................................................................................................................................................................54

19. Package Outline Drawings .........................................................................................................................................................................55

20. Example Marking Diagram for TSSOP14 Parts..........................................................................................................................................55

21. Storage and Soldering Conditions ..............................................................................................................................................................55

22. Glossary .....................................................................................................................................................................................................55

23. Ordering Information...................................................................................................................................................................................56

24. Document Revision History ........................................................................................................................................................................56

June 8, 2018

ZSSC3122 Datasheet

List of Figures

Figure 1.1

Figure 6.1

Figure 6.2

Figure 6.3

Figure 7.1

Figure 7.2

Figure 8.1

Figure 8.2

Figure 9.1

Figure 10.1

Figure 10.2

Figure 10.3

Figure 10.4

Figure 10.5

Figure 10.6

Figure 10.7

Figure 10.8

Figure 10.9

Pin Assignments for 4.4



5.0 mm 14-TSSOP – Top View...........................................................................................................6

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

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

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

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

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

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

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

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

General Operation .......................................................................................................................................................................20

Power-On Sequence with Fast Startup Bit Set in EEPROM .......................................................................................................21

Measurement Cycle Timing .........................................................................................................................................................22

Measurement Sequence in Update Mode ...................................................................................................................................23

I2C and SPI Data Fetching in Update Mode................................................................................................................................24

Measurement Sequence in Sleep Mode (Only I2C, SPI, or Alarms) ...........................................................................................25

I2C and SPI Data Fetching in Sleep Mode ..................................................................................................................................26

I2C Timing Diagram.....................................................................................................................................................................29

SPI Timing Diagram ....................................................................................................................................................................30

Figure 10.10 I2C Measurement Packet Reads .................................................................................................................................................31

Figure 10.11 SPI Output Packet with Positive Edge Sampling .........................................................................................................................32

Figure 10.12 I2C MR ........................................................................................................................................................................................32

Figure 10.13 SPI MR ........................................................................................................................................................................................33

Figure 10.14 Example of Alarm Function .........................................................................................................................................................35

Figure 10.15 Alarm Output Flow Chart .............................................................................................................................................................36

Figure 11.1

Figure 11.2

Figure 14.1

Figure 14.2

Figure 14.3

Figure 14.4

Figure 14.5

I2C Command Format .................................................................................................................................................................37

Command Mode Data Fetch .......................................................................................................................................................40

Digital Output with Optional Alarms Example ..............................................................................................................................49

Analog Output with Optional Alarms Example .............................................................................................................................50

Bang-Bang Control System Example ..........................................................................................................................................51

Differential Input Capacitance Example ......................................................................................................................................52

Ext. Reference Input Capacitance Example ................................................................................................................................53

June 8, 2018

ZSSC3122 Datasheet

List of Tables

Table 2.1

Table 9.1

Table 10.1

Table 10.2

Table 10.3

Table 10.4

Table 10.5

Table 10.6

Table 10.7

Table 10.8

Table 10.9

Table 10.10

Table 10.11

Table 10.12

Table 11.1

Table 11.2

Table 11.3

Table 12.1

Table 12.2

Table 12.3

Table 12.4

Table 12.5

Table 13.1

Table 14.1

Table 14.2

Table 14.3

Table 14.4

Table 14.5

Table 21.1

ZSSC3122 Pin Assignments for TSSOP-14 ..................................................................................................................................6

Selection Settings for C

REF

and C

OFF

...........................................................................................................................................17

CDC Resolution and Conversion Times ......................................................................................................................................22

Update Rate Settings ..................................................................................................................................................................23

Time Periods between Capacitance Measurements and Temperature Measurements for Different Resolution and Update

Rates ...........................................................................................................................................................................................24

Status Table ................................................................................................................................................................................27

Diagnostic Detection....................................................................................................................................................................27

Normal Operation Diagnostic Table ............................................................................................................................................27

Output Modes ..............................................................................................................................................................................28

Pin Assignment for Output Selections .........................................................................................................................................28

I2C Parameters ...........................................................................................................................................................................29

SPI Parameters ...........................................................................................................................................................................30

I2C and SPI Command Types .....................................................................................................................................................30

Low Pass Filter Example for R = 10k .......................................................................................................................................34

Command List and Encodings .....................................................................................................................................................38

Response Bits .............................................................................................................................................................................39

Command Diagnostic Bits ...........................................................................................................................................................39

EEPROM Word Assignments ......................................................................................................................................................41

ZMDI_Config Bit Assignments .....................................................................................................................................................43

C_Config Bit Assignments ...........................................................................................................................................................44

T_Config Bit Assignments ...........................................................................................................................................................45

Cust_Config Bit Assignments ......................................................................................................................................................46

Limits on Coefficient Ranges .......................................................................................................................................................48

Example 1: Configuration Settings ..............................................................................................................................................49

Example 2: Configuration Settings ..............................................................................................................................................50

Example 3: Configuration Settings ..............................................................................................................................................51

Example 4: Configuration Settings ..............................................................................................................................................52

Example 5: Configuration Settings ..............................................................................................................................................53

TSSOP14 Storage and Soldering Conditions ..............................................................................................................................55

June 8, 2018

ZSSC3122AI1B Related Products

	ZSSC3122AI1B	ZSSC3122AI1C	ZSSC3122AA1B	ZSSC3122AA1C	ZSSC3122AI2R	ZSSC3122AI2T
Description	WAFER (UNSAWN) - BOX	DICE (WAFER SAWN) - FRAME	WAFER (UNSAWN) - BOX	DICE (WAFER SAWN) - FRAME	TSSOP / 14 / 4,4MM G1 - TAPE&REE;	TSSOP / 14 / 4,4MM G1 - TUBE

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