ZSSC3123 Datasheet

© 2016 Integrated Device Technology, Inc.

3

January 26, 2016

Contents

List of Figures .............................................................................................................................................................4

List of Tables ..............................................................................................................................................................5

1

IC Characteristics ................................................................................................................................................7

1.1

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

1.2

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

1.3

Electrical Parameters ...................................................................................................................................8

1.4

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

1.4.1

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

1.4.2

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

1.5

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

1.6

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

2

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

2.1

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

2.2

Analog Front End........................................................................................................................................14

2.2.1

Capacitance-to-Digital Converter.........................................................................................................14

2.2.2

Temperature Measurement .................................................................................................................19

2.3

Digital Core .................................................................................................................................................21

3

Normal Operation Mode ....................................................................................................................................21

3.1

Power-On Sequence ..................................................................................................................................23

3.2

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

3.3

Measurement Modes ..................................................................................................................................24

3.3.1

Update Mode........................................................................................................................................24

3.3.2

Sleep Mode ..........................................................................................................................................27

3.4

Status and Diagnostics...............................................................................................................................29

3.4.1

EEPROM Error Detection and Correction............................................................................................30

3.4.2

Alarm Diagnostics ................................................................................................................................30

3.5

Output Modes .............................................................................................................................................31

3.6

I

2C™ and SPI .............................................................................................................................................31

3.6.1

I

2C™ Features and Timing...................................................................................................................31

3.6.2

SPI Features and Timing .....................................................................................................................32

3.6.3

I

2C™ and SPI Commands ...................................................................................................................33

3.6.4

Data Fetch (DF) ...................................................................................................................................34

3.6.5

Measurement Request (MR)................................................................................................................35

3.6.6

Ready Pin.............................................................................................................................................36

3.7

PDM (Pulse Density Modulation)................................................................................................................37

3.8

Alarm Output...............................................................................................................................................38

3.8.1

Alarm Registers....................................................................................................................................38

3.8.2

Alarm Operation ...................................................................................................................................38