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ZSSC3016CI1B Datasheet(PDF) 11 Page - List of Unclassifed Manufacturers |
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ZSSC3016CI1B Datasheet(HTML) 11 Page - List of Unclassifed Manufacturers |
11 / 45 page ZSSC3016 Low Power 16 Bit Sensor Signal Conditioner IC Data Sheet December 7, 2011 © 2011 Zentrum Mikroelektronik Dresden AG — Rev. 1.00 All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice. 11 of 44 2 Circuit Description 2.1. Brief Description The ZSSC3016 provides a highly-accurate amplification of bridge sensor signals. The compensation of sensor offset, sensitivity, temperature drift, and non-linearity is accomplished via an 18-bit DSP core running a correction algorithm with calibration coefficients stored in an MTP memory. The ZSSC3016 can be configured for a wide range of resistive bridge sensor types. A digital interface (SPI or I 2C) enables communication. The ZSSC3016 supports two operational modes: Normal Mode and Command Mode. Normal Mode is supposed to be the mode being used typically, in which the IC wakes up from a Sleep (low power) State, runs a measurement in Active State and turns back automatically to the Sleep State. 2.2. Signal Flow and Block Diagram See Figure 2.1 for the ZSSC3016 block diagram. 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 state machine controls the analog circuitry to perform the three measurement types: bridge, 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, the internal temperature reference sensor signals, or an input short for measuring offset. A full measurement request will trigger an automatic sequence of all measurement types and all input signals, respectively. The Temperature Reference Sensor block is based on a PTAT temperature sensor. The inherit (IC-fabrication related) device mismatch is suppressed by dynamic element matching technique. Figure 2.1 ZSSC3016 Functional Block Diagram. |
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