Pin and Pad Assignments and Descriptions .................................................................................................................................................6
1.1 ZSSC3224 Die Pad Assignments and Descriptions ............................................................................................................................6
1.2 ZSSC3224 24-PQFN Pin Assignments and Pin Descriptions .............................................................................................................7
2.
3.
4.
5.
Absolute Maximum Ratings ..........................................................................................................................................................................8
4.1 Power Supply Rejection Ratio (PSRR) versus Frequency ................................................................................................................11
5.2 Signal Flow and Block Diagram .........................................................................................................................................................12
5.3 Analog Front End...............................................................................................................................................................................13
Selection of Gain and Offset – Sensor System Dimensioning............................................................................................17
Temperature Measurement ................................................................................................................................................18
External Sensor: Absolute Voltage Source Sensors ..........................................................................................................18
Digital Signal Processor (DSP) Core ..................................................................................................................................19
Power Supervision..............................................................................................................................................................19
5.4 Digital Section....................................................................................................................................................................................19
6.1 Power Up ...........................................................................................................................................................................................20
Common Functionality ........................................................................................................................................................26
Calibration Step 2 – Data Collection ...................................................................................................................................37
6.5 Communication Interface...................................................................................................................................................................26
6.6 Multiple Time Programmable (MTP) Memory ....................................................................................................................................31
Bridge Signal Compensation ..............................................................................................................................................39
Temperature Signal Compensation ....................................................................................................................................41
Measurement Output Data Format .....................................................................................................................................42
6.8 The Calibration Math .........................................................................................................................................................................39
Quality and Reliability .................................................................................................................................................................................45
Related Documents ....................................................................................................................................................................................45
13. Document Revision History ........................................................................................................................................................................47
List of Figures
Figure 1.1
Figure 1.2
Figure 5.1
Figure 5.2
Figure 5.3
Figure 6.1
Figure 6.2
Figure 6.3
Figure 6.4
Figure 6.5
Figure 6.6
Figure 6.7
Figure 6.8
Figure 6.9
ZSSC3224 Die Pad Assignments .....................................................................................................................................................6
Pin Assignments: 4.0
4.0
0.85 mm 24-PQFN Package .............................................................................................................7
ZSSC3224 Functional Block Diagram with Resistive-Bridge Sensor .............................................................................................12
ZSSC3224 Functional Block Diagram with Voltage-Source Sensor...............................................................................................13
ADC Gain and Offset Setup ...........................................................................................................................................................18
Operational Flow Chart: Power Up .................................................................................................................................................22
Operational Flow Chart: Command Mode and Normal Mode (Sleep and Cyclic) ..........................................................................23
SPI Read Status .............................................................................................................................................................................29
Figure 6.10 I2C Read Status .............................................................................................................................................................................30
Figure 6.11 I2C Read Data ................................................................................................................................................................................30
Figure 7.1
Figure 7.2
Approximate ZSSC3224 Pad Layout ..............................................................................................................................................43
General 24-PQFN Package Dimensions ........................................................................................................................................44
ZSSC3224 Die Pad Assignments .....................................................................................................................................................6
Absolute Maximum Ratings ..............................................................................................................................................................8
Gain Polarity ...................................................................................................................................................................................14
ADC Conversion Times for a Single Analog-to-Digital Conversion ................................................................................................15
General Status Byte .......................................................................................................................................................................27
Mode Status ...................................................................................................................................................................................27
Measurement Results of ADC Raw Measurement Request (Two’s Complement) ........................................................................42
Calibration Coefficients (Factors and Summands) in Memory (Sign Magnitude) ...........................................................................42
Output Results from SSC-Correction Math or DSP—Sensor and Temperature ............................................................................42
Interrupt Thresholds TRSH1 and TRSH2—Format as for SSC-Correction Math Output ...............................................................42
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