ZSSC3123AA1B datasheet, PDF - EEWORLD Datasheet

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ZSSC3123AA1B: DescriptionCapacitive Sensor Signal Conditioner; File Size1MB，69 Pages; ManufacturerETC2

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Capacitive Sensor Signal Conditioner

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Data Sheet

Rev. 1.00/ September 2011

ZSSC3123

cLite

™

Capacitive Sensor Signal Conditioner

ZSSC3123

cLite™ Capacitive Sensor Signal Conditioner

Contents

IC Characteristics .................................................................................................................8

1.1 Absolute Maximum Ratings ............................................................................................8

1.2 Operating Conditions ......................................................................................................8

1.3 Electrical Parameters ......................................................................................................9

1.4 Current Consumption Graphs ....................................................................................... 12

1.4.1 Update Mode Current Consumption ........................................................................ 12

1.4.2 Sleep Mode Current Consumption........................................................................... 12

1.5 Output Pad Drive Strength ............................................................................................ 13

1.6 Temperature Sensor Nonlinearity ................................................................................. 14

Circuit Description .............................................................................................................. 15

2.1 Signal Flow and Block Diagram .................................................................................... 15

2.2 Analog Front End .......................................................................................................... 15

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

2.2.2 Temperature Measurement ..................................................................................... 21

2.3 Digital Core ................................................................................................................... 22

Normal Operation Mode ..................................................................................................... 22

3.1 Power-On Sequence ..................................................................................................... 24

3.2 Measurement Cycle ...................................................................................................... 24

3.3 Measurement Modes .................................................................................................... 25

3.3.1 Update Mode ........................................................................................................... 25

3.3.2 Sleep Mode ............................................................................................................. 29

3.4 Status and Diagnostics ................................................................................................. 31

3.4.1 EEPROM Error Detection and Correction ................................................................ 32

3.4.2 Alarm Diagnostics .................................................................................................... 33

3.5 Output Modes ............................................................................................................... 33

3.6 I

C and SPI ................................................................................................................... 33

3.6.1 I

C Features and Timing .......................................................................................... 34

3.6.2 SPI Features and Timing ......................................................................................... 35

3.6.3 I

C and SPI Commands ........................................................................................... 36

3.6.4 Data Fetch (DF) ....................................................................................................... 36

without the prior written consent of the copyright owner. The information furnished in this publication is subject to changes

without notice.

Data Sheet

September 29, 2011

4 of 67

ZSSC3123

cLite™ Capacitive Sensor Signal Conditioner

3.6.5 Measurement Request (MR) ................................................................................... 38

3.6.6 Ready Pin ................................................................................................................ 39

3.7 PDM (Pulse Density Modulation) .................................................................................. 39

3.8 Alarm Output ................................................................................................................. 41

3.8.1 Alarm Registers ....................................................................................................... 41

3.8.2 Alarm Operation....................................................................................................... 41

3.8.3 Alarm Output Configuration ..................................................................................... 43

3.8.4 Alarm Polarity .......................................................................................................... 43

Command Mode ................................................................................................................. 44

4.1 Command Format ......................................................................................................... 44

4.2 Command Encodings .................................................................................................... 44

4.3 Command Response and Data Fetch ........................................................................... 46

EEPROM ............................................................................................................................ 49

5.1.1 ZMDI Configuration Register (ZMDI_Config, EEPROM Word 02

HEX

) ...................... 51

5.1.2 Capacitance Analog Front End Configuration (C_Config, EEPROM Word 06

HEX

)... 52

5.1.3 Temperature Analog Front End Configuration (T_Config, EEPROM Word 11

HEX

) .. 53

5.1.4 Customer Configuration Register (Cust_Config, EEPROM Word 1C

HEX

) ................ 54

Calibration and Signal Conditioning Math ........................................................................... 55

6.1 Capacitance Signal Conditioning .................................................................................. 55

6.2 Temperature Signal Compensation .............................................................................. 57

6.3 Limits on Coefficient Ranges ........................................................................................ 58

Application Circuit Examples .............................................................................................. 59

7.1 Digital Output with Optional Alarms .............................................................................. 59

7.2 Analog Output with Optional Alarms ............................................................................. 60

7.3 Bang-Bang Control System ............................................................................................ 61

7.4 Differential Input Capacitance ....................................................................................... 62

7.5 External Reference Capacitor ....................................................................................... 63

ESD/Latch-Up-Protection ................................................................................................... 63

Pin Configuration and Package .......................................................................................... 64

10 Test..................................................................................................................................... 65

Data Sheet

September 29, 2011

without the prior written consent of the copyright owner. The information furnished in this publication is subject to changes

without notice.

5 of 67

ZSSC3123AA1B Related Products

	ZSSC3123AA1B	ZSSC3123AA1C	ZSSC3123AA2
Description	Capacitive Sensor Signal Conditioner	Capacitive Sensor Signal Conditioner	Capacitive Sensor Signal Conditioner

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