ZSSC3123AA1B datasheet, PDF - EEWORLD Datasheet

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cLite

Capacitive Sensor

Signal Conditioner

ZSSC3123

Datasheet

Brief Description

The ZSSC3123 is a CMOS integrated circuit for accurate

capacitance-to-digital conversion and sensor-specific

correction of capacitive sensor signals. Digital compen-

sation 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 ZSSC3123 is configurable for capacitive sensors with

capacitances up to 260pF and a sensitivity of 125aF/LSB

to 1pF/LSB depending on resolution, speed, and range

settings. 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 I C

™

*, SPI, PDM, or

alarms.

The I C™ interface can be used for a simple PC-controlled

calibration procedure to program a set of calibration

coefficients into an on-chip EEPROM. The calibrated

ZSSC3123 and a specific sensor are mated digitally: fast,

precise, and without the cost overhead of trimming by

external devices or laser.

Benefits

•

Minimized calibration costs: no laser trimming, one-

pass calibration using a digital interface

Wide capacitance range to support a broad portfolio of

different sensor elements

Excellent for low-power battery applications

Interfaces

•

I²C™ or SPI interface—easy connection to a µC

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

Physical Characteristics

•

Supply voltage: 2.3V to 5.5V

Typical current consumption 650μA down to 60μA

depending on configuration

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

Operation temperature: –40°C to +125°C

Die or TSSOP14 package

Features

•

Maximum target input capacitance: 260pF

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

1.6ms at 10-bit; 5.0ms at 12-bit; 18.5ms at 14-bit

Digital compensation of sensor: piece-wise 1 and 2

order sensor compensation or up to 3 order single-

region sensor compensation

Digital compensation of 1 and 2 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@ -40 to 125°C, 3V, 5V, Vsupply ±10%

Available Support

•

ZSSC3123 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: Digital Output, Alarms

SUPPLY

(2.3V to 5.5V)

VDD

cLite

™

ZSSC3123

Ready

0.1µF

Vcore

VSS

SDA/MISO

SCL/SCLK

GND

Alarm_High

Alarm_Low

C™ is a registered trademark of NXP.

† See data sheet section 1.3 for restrictions.

January 26, 2016

ZSSC3123 Datasheet

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

3.6.1

I C™ Features and Timing................................................................................................................... 31

3.6.2

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

3.6.3

I C™ 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

January 26, 2016

ZSSC3123 Datasheet

3.8.3

Alarm Output Configuration ................................................................................................................. 40

3.8.4

Alarm Polarity ....................................................................................................................................... 40

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

IDT Configuration Register (IDT_Config, EEPROM Word 02

HEX

) ....................................................... 47

5.1.1

5.1.2

Capacitance Analog Front End Configuration (C_Config, EEPROM Word 06

HEX

) .............................. 48

5.1.3

Temperature Analog Front End Configuration (T_Config, EEPROM Word 11

HEX

) ............................. 49

5.1.4

Customer Configuration Register (Cust_Config, EEPROM Word 1C

HEX

) ........................................... 50

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

6.1

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

6.2

Temperature Signal Compensation ............................................................................................................ 53

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 ......................................................................................................................... 58

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

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

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

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

14 Related Documents ........................................................................................................................................... 61

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

16 Document Revision History ............................................................................................................................... 62

List of Figures

Figure 1.1

Figure 1.2

Figure 1.3

Figure 1.4

Figure 1.5

Figure 1.6

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

January 26, 2016

ZSSC3123 Datasheet

Figure 1.7

Figure 2.1

Figure 3.1

Figure 3.2

Figure 3.3

Figure 3.4

Figure 3.5

Figure 3.6

Figure 3.7

Figure 3.8

Figure 3.9

Figure 3.10

Figure 3.11

Figure 3.12

Figure 3.13

Figure 3.14

Figure 3.15

Figure 4.1

Figure 4.2

Figure 7.1

Figure 7.2

Figure 7.3

Figure 7.4

Figure 7.5

Figure 9.1

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

ZSSC3123 Block Diagram ................................................................................................................... 14

General Operation ............................................................................................................................... 22

Power-On Sequence with Fast Startup Bit Set in EEPROM ............................................................... 23

Measurement Cycle Timing ................................................................................................................ 24

Measurement Sequence in Update Mode ........................................................................................... 25

I C™ and SPI Data Fetching in Update Mode .................................................................................... 27

Measurement Sequence in Sleep Mode (Only I C™, SPI, or Alarms)................................................ 28

I C™ and SPI Data Fetching in Sleep Mode ....................................................................................... 29

I C™ Timing Diagram ......................................................................................................................... 32

SPI Timing Diagram ............................................................................................................................. 33

I C™ Measurement Packet Reads ...................................................................................................... 34

SPI Output Packet with Positive Edge Sampling................................................................................. 35

I C™ MR .............................................................................................................................................. 36

SPI MR ................................................................................................................................................. 36

Example of Alarm Function.................................................................................................................. 39

Alarm Output Flow Chart ..................................................................................................................... 39

I C™ Command Format ...................................................................................................................... 41

Command Mode Data Fetch................................................................................................................ 44

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

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

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

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

Ext. Reference Input Capacitance Example ........................................................................................ 58

ZSSC3123 Pin-Out Diagram ............................................................................................................... 59

List of Tables

Table 2.1

Table 2.2

Table 3.1

Table 3.2

Table 3.3

Table 3.4

Table 3.5

Table 3.6

Table 3.7

Table 3.8

CDC Multiplier ...................................................................................................................................... 17

Selection Settings for C

REF

, and C

OFF

, and Mult (Capacitance ranges are nominal values) ............... 18

CDC Resolution and Conversion Times .............................................................................................. 24

Update Rate Settings .......................................................................................................................... 25

Time Periods between Capacitance Measurements and Temperature Measurements for Different

Mult, Resolution and Update Rates ..................................................................................................... 26

Status Table ......................................................................................................................................... 30

Diagnostic Detection ............................................................................................................................ 30

Normal Operation Diagnostic Table .................................................................................................... 30

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

Pin Assignment for Output Selections ................................................................................................. 31

January 26, 2016

ZSSC3123AA1B Related Products

	ZSSC3123AA1B	ZSSC3123AA2T	ZSSC3123AI2R	ZSSC3123AI2T
Description	Integrated Device Technology Wafer (unsawn) - box	Sensor Interface Sensor Signal Conditoner	Sensor Interface TSSOP / 14 / 4,4mm G1 - tape&reel - 13"	Sensor Interface TSSOP / 14 / 4,4mm G1 - tube
Product Attribute	Attribute Value	Attribute Value	Attribute Value	-
Manufacturer	IDT (Integrated Device Technology)	IDT (Integrated Device Technology)	IDT (Integrated Device Technology)	-
Product Category	Integrated Device Technology	Sensor Interface	Sensor Interface	-

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