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ZSSC3218 Datasheet(PDF) 10 Page - Integrated Device Technology |
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ZSSC3218 Datasheet(HTML) 10 Page - Integrated Device Technology |
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10 / 55 page  ZSSC3218 Datasheet © 2016 Integrated Device Technology, Inc. 10 April 20, 2016 2 Circuit Description 2.1. Brief Description The ZSSC3218 provides a highly accurate amplification of bridge sensor signals. The compensation of sensor offset, sensitivity, temperature drift, and non-linearity is accomplished via a 26-bit DSP core running a correction algorithm with calibration coefficients stored in a non-volatile memory. The ZSSC3218 can be configured for a wide range of resistive bridge sensor types and for absolute voltage source sensors. A digital interface (SPI or I 2C™) enables communication. The ZSSC3218 supports two operational modes: Normal Mode and Command Mode. Normal Mode is the standard operating mode. Typically in Normal Mode, the ZSSC3218 wakes up from a Sleep State (low power), runs a measurement in Active State, and automatically returns to the Sleep State. (See section 3.4 for details on operational modes.) 2.2. Signal Flow and Block Diagram See Figure 2.1 and Figure 2.2 for the ZSSC3218 block diagram for different input sensors. The sensor bridge supply VDDB and the power supply for analog circuitry are provided by a voltage regulator, which is optimized for power supply disturbance rejection (PSRR). See section 1.4 for a graph of PSRR versus frequency. To improve noise suppression, the digital blocks are powered by a separate voltage regulator. A power supervision circuit monitors all supply voltages and generates appropriate reset signals for initializing the digital blocks. The System Control Unit controls the analog circuitry to perform the three measurement types: external sensor, temperature, and offset measurement. The multiplexer selects the signal input to the amplifier, which can be the external signals from the input pins INP and INN or the internal temperature reference sensor signals. A full measurement request will trigger an automatic sequence of all measurement types and all input signals. Figure 2.1 ZSSC3218 Functional Block Diagram, Resistive-Bridge Sensor Sensor Bridge AGND / CM Generator Bias Current Generator Power-ON Reset Temperature Reference Sensor DSP Core (Calculations, Communication) MTP System Control Unit Pre- Amplifier VTP VTN EOC INP INN VDD VSSB Oscillator Clock Generator SPI I²C TM SCLK/SCL MISO MOSI/SDA SS VSS Voltage Regulator Power Ctr. Vreg int A D 18 Bit VDDB ZSSC3218 RES |
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