ZSSC3018BA3W datasheet, PDF - EEWORLD Datasheet

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ZSSC3018BA3W: DescriptionSENSOR SIGNAL CONDITIONER; Categorysemiconductor Analog mixed-signal IC; File Size1MB，50 Pages; ManufacturerIDT (Integrated Device Technology, Inc.); Websitehttp://www.idt.com/

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ZSSC3018BA3W Overview

SENSOR SIGNAL CONDITIONER

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Versatile, High Resolution 18-Bit

Sensor Signal Conditioner

Brief Description

The ZSSC3018 is a sensor signal conditioner (SSC) integrated

circuit for high-accuracy amplification and analog-to-digital

conversion of differential or pseudo-differential input signals.

Designed for high-resolution sensor module applications, the

ZSSC3018 can perform offset, span, and 1

and 2

order

temperature compensation of the measured signal. Developed for

correction of resistive bridge or absolute voltage sensors, it can

also provide a corrected temperature output measured with an

internal sensor.

The measured and corrected sensor values are provided at the

digital output pins, which can be configured as I

C (≤ 3.4MHz) or

SPI (≤ 10MHz). Digital compensation of signal offset, sensitivity,

temperature, and non-linearity is accomplished via a 26-bit

internal digital signal processor (DSP) running a correction

algorithm. Calibration coefficients are stored on-chip in a highly

reliable, non-volatile, multiple-time programmable (MTP) memory.

Programming the ZSSC3018 is simple via the serial interface. The

interface is used for the PC-controlled calibration procedure,

which programs the set of calibration coefficients in memory. The

ZSSC3018 provides accelerated signal processing, increased

resolution, and improved noise immunity in order to support high-

speed control, safety, and real-time sensing applications with the

highest requirements for energy efficiency.

ZSSC3018

Datasheet

Benefits



Integrated 26-bit calibration math DSP

Fully corrected signal at digital output

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

density chip-on-board assembly

One-pass calibration minimizes calibration costs

No external trimming, filter, or buffering components required

Highly integrated CMOS design

Integrated reprogrammable non-volatile memory

Excellent for low-voltage and low-power battery applications

Optimized for operation in calibrated resistive sensor

(e.g., pressure) or calibrated absolute voltage sensor

(e.g., thermopile) modules

Physical Characteristics

Supply voltage range: 1.68V to 3.6V



Current consumption: ~1.0mA (typical) in operating mode



Features



Flexible, programmable analog front-end design; up to 18-bit

analog-to-digital converter (ADC)

Fully programmable gain amplifier with gain range from 6.6 to

216 (linear)

Internal auto-compensated temperature sensor

Digital compensation of individual sensor offset; 1

and 2

order digital compensation of sensor gain as well as of 1

and 2

order temperature gain and offset drift

Programmable interrupt operation

High-speed sensing: e.g., 16-bit conditioned sensor signal

measurement rate >500s

-1

Typical sensor system can achieve an accuracy of better than

0.10% FSO*

-40 to 125°C



Sleep Mode current: 50nA (typical) at

125°C;

20nA (typical)

85°C

Temperature resolution: <0.003K/LSB

Best-in-class energy-efficiency:

with 16-bit resolution: <140pJ/step

with 18-bit resolution: <50pJ/step

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

Delivery options: die or 24-PQFN (4 x 4 mm) package

FSO = Full Scale Output.

ZSSC3018 Application Example

Sensor Bridge

VDD

GND

ZSSC3018

24-PQFN

EOC

MISO

MOSI/SDA

SCLK/SCL

January 10, 2017

ZSSC3018 Datasheet

Table of Contents

IC Characteristics .........................................................................................................................................................................................6

1.1 Absolute Maximum Ratings .................................................................................................................................................................6

1.2 Operating Conditions ...........................................................................................................................................................................6

1.3 Electrical Parameters ..........................................................................................................................................................................7

1.4 Power Supply Rejection Ratio (RSRR) versus Frequency ..................................................................................................................9

Circuit Description ......................................................................................................................................................................................10

2.1 Brief Description ................................................................................................................................................................................10

2.2 Signal Flow and Block Diagram .........................................................................................................................................................10

2.3 Analog Front End...............................................................................................................................................................................12

2.3.1

2.3.2

2.3.3

2.3.4

2.3.5

2.3.6

2.4.1

2.4.2

2.4.3

2.4.4

2.4.5

Amplifier..............................................................................................................................................................................12

Analog-to-Digital Converter ................................................................................................................................................13

Selection of Gain and Offset – Sensor System Dimensioning............................................................................................15

Temperature Measurement ................................................................................................................................................16

External Sensor Supply: Bridge Sensors............................................................................................................................16

External Sensor: Absolute Voltage Source Sensors ..........................................................................................................16

Digital Signal Processor (DSP) Core ..................................................................................................................................17

MTP Memory ......................................................................................................................................................................17

Clock Generator .................................................................................................................................................................17

Power Supervision..............................................................................................................................................................17

Interface..............................................................................................................................................................................17

2.4 Digital Section....................................................................................................................................................................................17

Functional Description ................................................................................................................................................................................18

3.1 Power-Up...........................................................................................................................................................................................18

3.2 Measurements ...................................................................................................................................................................................18

3.3 Interrupt (EOC Pin) ............................................................................................................................................................................18

3.4 Operational Modes ............................................................................................................................................................................20

3.4.1

3.5.1

3.5.2

3.5.3

3.6.1

3.6.2

3.7.1

3.7.2

3.7.3

SPI/I

C Commands ............................................................................................................................................................23

Common Functionality ........................................................................................................................................................26

SPI ......................................................................................................................................................................................27

C.......................................................................................................................................................................................29

Programming Memory ........................................................................................................................................................30

Memory Contents ...............................................................................................................................................................31

Calibration Step 1 – Assigning Unique Identification ..........................................................................................................39

Calibration Step 2 – Data Collection ...................................................................................................................................39

Calibration Step 3a) – Coefficient Calculations ..................................................................................................................40

3.5 Communication Interface...................................................................................................................................................................26

3.6 Memory..............................................................................................................................................................................................30

3.7 Calibration Sequence ........................................................................................................................................................................39

January 10, 2017

ZSSC3018 Datasheet

3.7.4

3.7.5

3.8.1

3.8.2

3.8.3

Calibration Step 3b) – Post-Calibration Offset Correction ..................................................................................................40

SSC Measurements ...........................................................................................................................................................41

Bridge Signal Compensation ..............................................................................................................................................42

Temperature Signal Compensation ....................................................................................................................................44

Measurement Output Data Format .....................................................................................................................................45

3.8 The Calibration Math .........................................................................................................................................................................42

Packaging Dimensions and Pin Assignments ............................................................................................................................................46

Quality and Reliability .................................................................................................................................................................................48

Ordering Sales Codes ................................................................................................................................................................................48

Related Documents ....................................................................................................................................................................................48

Glossary .....................................................................................................................................................................................................48

Document Revision History ........................................................................................................................................................................50

Table of Figures

Figure 2.1 ZSSC3018 Functional Block Diagram, Resistive-Bridge-Sensor .....................................................................................................10

Figure 2.2 ZSSC3018 Functional Block Diagram, Voltage-Source-Sensor ......................................................................................................11

Figure 2.3 ADC Gain and Offset Setup .............................................................................................................................................................16

Figure 3.1 Interrupt Functionality: INT_setup = 01 and INT_setup = 10 ...........................................................................................................19

Figure 3.2 Interrupt Functionality: INT_setup = 11 ............................................................................................................................................20

Figure 3.3 Operational Flow Chart: Power Up ..................................................................................................................................................21

Figure 3.4 Operational Flow Chart: Command Mode and Normal Mode (Sleep and Cyclic) ............................................................................22

Figure 3.5 SPI Configuration CPHA=0 ..............................................................................................................................................................27

Figure 3.6 SPI Configuration CPHA=1 ..............................................................................................................................................................27

Figure 3.7 SPI Command Request ...................................................................................................................................................................28

Figure 3.8 SPI Read Status ..............................................................................................................................................................................28

Figure 3.9 SPI Read Data .................................................................................................................................................................................28

Figure 3.10 I

C Command Request ....................................................................................................................................................................29

Figure 3.11 I

C Read Status ...............................................................................................................................................................................29

Figure 3.12 I

C Read Data ..................................................................................................................................................................................30

January 10, 2017

ZSSC3018 Datasheet

List of Tables

Table 1.1

Table 1.2

Table 1.3

Table 1.4

Table 2.1

Table 2.2

Table 2.3

Table 2.4

Table 2.5

Table 2.6

Table 3.1

Table 3.2

Table 3.3

Table 3.4

Table 3.5

Table 3.6

Table 3.7

Table 3.8

Table 3.9

Table 4.1

Table 4.2

Absolute Maximum Ratings ...............................................................................................................................................................6

Operating Conditions .........................................................................................................................................................................6

Requirements for VDD Power-on Reset (POR) .................................................................................................................................7

Electrical Parameters .........................................................................................................................................................................7

Amplifier Gain: Stage 1 ....................................................................................................................................................................12

Amplifier Gain: Stage 2 ....................................................................................................................................................................12

Gain Polarity ....................................................................................................................................................................................13

ADC Conversion Times for a Single A2D Conversion .....................................................................................................................13

ADC Offset Shift ...............................................................................................................................................................................14

Typical Conversion Times versus Noise Performance with Full Sensor Signal Conditioning for Measurement Including AZSM,

SM, AZTM, and TM (Bridge-Type Sensor) ......................................................................................................................................14

SPI/I

C Commands ..........................................................................................................................................................................23

Get_Raw Commands .......................................................................................................................................................................25

General Status Byte .........................................................................................................................................................................26

Mode Status .....................................................................................................................................................................................26

MTP Memory Content Assignments ................................................................................................................................................31

Measurement Results of ADC Raw Measurement Request (Two’s Complement) ..........................................................................45

Calibration Coefficients (Factors and Summands) in Memory (Sign-Magnitude) ............................................................................45

Output Results from SSC-Correction Math or DSP—Sensor and Temperature ..............................................................................45

Interrupt Thresholds TRSH1 and TRSH2—Format as for SSC-Correction Math Output.................................................................45

24-PQFN Dimensions (4 x 4 mm) ....................................................................................................................................................46

Pin Assignments 24-PQFN ..............................................................................................................................................................47

January 10, 2017

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