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ZMD31020BIB Datasheet(PDF) 7 Page - Zentrum Mikroelektronik Dresden AG |
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ZMD31020BIB Datasheet(HTML) 7 Page - Zentrum Mikroelektronik Dresden AG |
7 / 19 page Copyright © 2004, ZMD AG, Rev. 1.6, 2005-05-19 7/19 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 preliminary and subject to changes without notice. ZMD31020 Sensor Signal Conditioner Datasheet 2.5.4 Temperature Measurement The temperature sensing diode, selected by TS – configuration bit 5, is biased with a constant current of 40µA. It‘s forward drop changes with –2.1mV/°K typically, and is passed as differential temperature signal. The 40µA current source is only on during temperature measurement, to prevent any interference with the bridge sensor signal's measurement. The differential temperature signal is resolved by the ADC with only 10 bits, against a differential reference voltage of 0.980V, derived from an on-chip bandgap. Whenever measuring temperature, the ADC is set to RSADC = 15/16. The CMC performs the sensor signal fine-tuning in the digital domain. It is a 16 bit RISC micro-controller, driven by an on-chip clock generator with a nominal clock frequency of 1.5 MHz. The overall clock frequency tolerance is smaller than ±25%. The CMC includes a 16-bit width ALU and a (16 x 16)-bit RAM. Furthermore it has a 12- bit input counter into which the ADC will serially transmit conversion results; 4096 clock cycles are needed per result. The CMC is connected to a (1k x 16)-bit instruction ROM and a (12 x 16)-bit parameter EEPROM. At the output side the CMC is equipped with an I 2C-interface as a digital series output for the corrected sensor signal. Initially, during calibration, the same interface is used bi-directionally: to write the configuration word into the EEPROM, to read non-corrected sensor value as well as temperature, and again and finally to write the valid calibration parameters into the EEPROM. The parameter EEPROM is a non-volatile store for 12 parameter values, each with 16 bits of width. Address Parameter Default content 0HEX calibration parameter a0 for sensor's non-linearity correction 5234 Hex 1HEX calibration parameter a1 for sensor's offset correction 0023 Hex 2HEX calibration parameter a2 for first order sensor offset drift correction 2044 Hex 3HEX calibration parameter a3 for second order sensor offset drift correction 3022 Hex 4HEX calibration parameter a4 for gain correction 6356 Hex 5HEX calibration parameter a5 for first order gain drift correction 1045 Hex 6HEX calibration parameter a6 for second order gain drift correction 2073 Hex 7HEX low-side scale limit value for corrected sensor signal 03E8 Hex 8HEX high-side scale limit value for corrected sensor signal 0FA0 Hex 9HEX configuration word 0040 Hex AHEX customer-specific identification word 1234 Hex BHEX customer-specific identification word 5678 Hex Contents of the parameter EEPROM The configuration word and it's contents under address &H09 have been described already in chapter 2.5. The calibration parameters are stored under addresses &H00 through &H06. The calculation of these parameters is described in the ZMD31020 Functional Description. 2.6 Correction Microcontroller CMC 2.7 Parameter EEPROM |
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