ZSSC3131 / ZSSC3136 Application Note - Automotive Sensor Switch
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1 ZSSC33 / ZSSC336 Application Note - Automotive Sensor Switch Contents Description..... General..... ZSSC33 and ZSSC336 Sensor Conditioners Benefits for Automotive Switch Applications... Setting up the ZSSC33/36 for Switching Applications Threshold with Offset and Hysteresis Alarm Window Digital Filter Fast or Slow Switches Application Circuits Related Documents... 5 Glossary... 6 Document Revision History... List of Figures Figure. Calibration Window... 3 Figure. Switch Implementation... 4 Figure.3 Switch with Hysteresis... 5 Figure.4 Switch Setting Example... 5 Figure.5 Sensor Range Correction... 6 Figure 3. Sensor Switch Application Driving a Relay... 9 Figure 3. Sensor Switch Application Connected to a Microcontroller... 9 Figure 3.3 Alarm Window... 0 Figure 3.4 Adding Hysteresis to the put... 0 List of Tables Table. Alarm Window Operation using Two Comparators... 6 Table. Fast vs. Slow Switch Setup Integrated Device Technology, Inc. March 30, 06
2 ZSSC33 / ZSSC336 Application Note - Automotive Sensor Switch Description.. General This document describes how to setup switch applications based on the ZSSC33 and ZSSC336 sensor conditioners, using the ZSSC33x Graphic User Interface (GUI). ZSSC33x family ICs are designed for automotive and industrial sensor signal conditioning (SSC) applications requiring a high degree of accuracy, strong ESD protection, and EMC immunity. Limit control is a common application for sensor switches, and it is an integral part of many sensing systems. Sensor switches have found many applications in automotive, industrial and consumer electronics. Sensing parameters for the ZSSC33/36 can be - Pressure - Flow - Force, torque, and acceleration - Proximity and similar measurements Typical applications, especially automotive uses, include engine oil pressure measurement, hydraulic brake systems, brake lights, dust control applications, fuel level gauges, filter systems, feedback for gear selection, clutch controls, and many others. ZSSC33x ICs are also applicable in HVAC and cooling systems... ZSSC33 and ZSSC336 Sensor Conditioners The ZSSC33 and the ZSSC336 are part of the ZSSC33x product family for automotive applications featuring the following functionality: Protection: excellent electromagnetic behavior as well as AEC-Q00 qualification. Flexibility: analog front-end (AFE) fits a wide range of sensors. put: ratiometric analog voltage output between 5% and 95% of maximum 5.5V supply voltage. Threshold and slew rate: adjustable via EEPROM settings. Safety: features for meeting SIL requirements (for ZSSC336 only)..3. Benefits for Automotive Switch Applications Many of the advantages of the ZSSC33/36 are specifically designed for automotive sensor switch applications: All settings are stored in an internal EEPROM. High accuracy can be achieved because the sensor signal used to trigger the switch has been conditioned. Flexible analog front-end allows configuration for nearly all resistive bridge sensor elements. Both ZSSC33 and ZSSC336 have automotive qualification and integrated automotive protection circuits. Integrated safety functions allow setting up SIL-rated switch applications using the ZSSC Integrated Device Technology, Inc. March 30, 06
3 ZSSC33 / ZSSC336 Application Note - Automotive Sensor Switch Setting up the ZSSC33/36 for Switching Applications The ZSSC33/36 output pin 9 (AOUT) is an analog voltage output within the range of 5% to 95% of the supply voltage VDDE. Depending on the calibration setup used, this output can have the functionality of either a ratiometric output voltage or of a switch (Alarm). For using the ZSSC33/36 with ratiometric voltage output, the normal calibration procedure is used (see the ZSSC33x Evaluation Kit Description for details). For switch configuration, refer to the following sections for setting the critical switch parameters. These settings refer to a linear calibration procedure (two-point calibration). Figure. Calibration Window.. Threshold with Offset and Hysteresis The threshold or the switching point is where the output voltage changes between the set maximum and minimum level (V and V MAX ); i.e., the switch is triggered. To design a switch with the ZSSC33 or ZSSC336, first a normal calibration procedure should be performed. This will determine the raw data values (PM and PM as shown in Figure.) corresponding to the minimum and maximum (V and V MAX ) output levels (see Figure.). 06 Integrated Device Technology, Inc. 3 March 30, 06
4 ZSSC33 / ZSSC336 Application Note - Automotive Sensor Switch Next the thresholds, including offset, can be calculated using the equations below: Equations Symbol Definitions PM PM p = * pth[%] + PM 00 p, p : Threshold levels. If p is greater than p (positive offset), then the output signal is active-high and vice versa. p = p + / Offset PM, PM: Acquired raw data from initial calibration. P M < p < p or P M < p < p (active-high or active-low signal) p < < p PM or < p PM p < (active-high or active-low signal) Offset: p Th [%]: Number of steps between V and V MAX corresponding to the raw data values. Desired switching level in percentage of the sensor signal range (0% - 00%). Offset (PM PM) V, V MAX: Minimum and maximum of analog output AOUT. V DD: Active-HIGH/LOW: Supply voltage (Max. 5.5V). Depending on the sign used for the offset active- HIGH (-) or active LOW (+) output is defined. Figure. Switch Implementation V DD V MAX Calibrated Sensor Response V DD V MAX Switch Response with Offset Offset Active High V PM PM Sensor Signal V p p Active Low Sensor Signal 06 Integrated Device Technology, Inc. 4 March 30, 06
5 ZSSC33 / ZSSC336 Application Note - Automotive Sensor Switch An actual hysteresis can be achieved using external components (for example a Schmitt trigger as shown in Figure 3.4). Trigger levels can be any levels within the V and V MAX window (maximum is 5% to 95% of VDDE). In normal cases, these differ from V and V MAX and p and p must be adjusted as described in section.. Figure.3 Switch with Hysteresis V DD Switch Response with Offset V DD Switch Response with Hysteresis V MAX V REF ' Offset V MAX V REF ' V V Sensor p' p p p' Signal p p Sensor Signal Note that the p and p parameters should not exceed the PM and PM values. To complete the procedure for setting the switch threshold and offset, the PM and PM values must be replaced with the calculated p and p and the coefficients must be calculated and stored again by clicking calccoef. Example: Calibrating a pressure sensor using the ZSSC33. Measured PM = 00 (at 0 psi for 0%) and PM = 8000 (at 0psi for 00%). The trigger level is chosen as 50% and hysteresis at 00, active-high (-): Result PM = p = * = 4050 PM = p = = Figure.4 Switch Setting Example Initial Calibration Re-Calculate Coefficients put signal will start switching from 0% to 90% at 3950 with 00 step levels. 06 Integrated Device Technology, Inc. 5 March 30, 06
6 ZSSC33 / ZSSC336 Application Note - Automotive Sensor Switch.. Alarm Window In order to achieve an alarm window with a single analog voltage output, external components must be added as shown in the application circuits in section 3. There are two external reference voltages (V REF and V REF corresponding to sensor outputs p and p ) setting the trigger points and shaping the alarm window. When the output voltage is within the desired limits, both comparator outputs are HIGH, so no current is running through the load R L (see Figure 3.3). Table. Alarm Window Operation using Two Comparators Input Inverting Non-Inverting Load V < V REF HIGH LOW On V < REF < V VREF HIGH HIGH Off V > V REF LOW HIGH On If the alarm window is relatively narrow, it makes sense to adjust the calibration of the sensor so that the output response is within user-selected margins, for example +/- p, of the alarm window (see Figure.5). This will increase the voltage difference ( V) of the trigger points and will make the actual schematic implementation easier. However, the change in the trigger levels should be taken into account for the given switching points using the subsequent equations. Formulas for calibration values based on actual measured trigger levels are also given. Figure.5 Sensor Range Correction V DD V MAX Sensor Range B V DD V MAX V REF ' Reduced Range B B V REF V REF V V V V REF ' - p + p A V Sensor A A PM p p PM Signal p' p p p' Sensor Signal 06 Integrated Device Technology, Inc. 6 March 30, 06
7 ZSSC33 / ZSSC336 Application Note - Automotive Sensor Switch Subsequent calculations: With given trigger levels V REF and V REF and defined window points p / [%] (reverse task): p / V REFn V' REF PM PM = p 00 = (V p' = p Dp Dp = p' p' V + (V / MAX p' V 00 MAX [%] + PM V = p + Dp VDD pn[%]) 00 ) + V p / pk p' = k p' Where PM PM = p 00 pk k p p' = p' + (V k / MAX [%] + PM V ) V' REF p p' = p' p' (V MAX V ) + V k = V' REF V k = V' REF V.3. Digital Filter The ZSSC33 and ZSSC336 offer a digital (averaging) filter function for calculating the output result. In practice, the digital filter adds the limitation of the analog output signal change (raise or fall). Mathematically the function can be described with the following equations: Equations Symbol Definitions S OUTi = S + (S S OUTi i OUTi LPF ) * DIFF LPFAVRG + ; i > 0; S i : S OUTi : Conditional equation result put result to be calculated S AVRG,S DIFF [0;7] LPF DIFF : Low pass filter differential coefficient (differential) LPF DIF LPFAVGR + LPF AVG : Averaging low pass filter coefficient (integrating) LPF + DIFF LPF AVRG Note that the coefficient must never become larger than! Otherwise, the filter function will oscillate and the system would have a flywheel effect. The output S OUTi is set to S i for the first calculation of an output result. 06 Integrated Device Technology, Inc. 7 March 30, 06
8 ZSSC33 / ZSSC336 Application Note - Automotive Sensor Switch The difference between this filter function and the function described in section. is that the output result is changing per measuring cycle (at specific time intervals). It is a purely software solution for noise immunity that adds a delay to the response even if the trigger point is reached. Note that setting the coefficients LPF AVRG and LPF DIFF to 0 disables the filter function..4. Fast or Slow Switches Depending on the target applications, both fast and slow switches can be achieved using ZSSC33/36 signal conditioners. An ON/OFFF delay can be implemented externally by adding a delay section in the drive circuit based on passive components. Table. outlines the applicable configuration: Table. Fast vs. Slow Switch Setup Switch Offset Hysteresis Digital Filter Delay Comments Fast Switch Yes/No Yes No No Slow Switch Yes/No Yes Yes Yes The switch will trigger once the threshold level is reached. External hysteresis can be used for noise immunity. All configuration parameters are applicable for shaping the output response. 06 Integrated Device Technology, Inc. 8 March 30, 06
9 ZSSC33 / ZSSC336 Application Note - Automotive Sensor Switch 3 Application Circuits Figure 3. Sensor Switch Application Driving a Relay Sensor Bridge C3 47nF C4 C VSSE AOUT VBN VBR_B VBP VBR_T IRTEMP ZSSC33/ZSSC336 VDDE VDD n.c. SCL SDA VSSA C 00nF C 00nF V SUPP +4.5V to +5.5V R kω R 50Ω Figure 3. Sensor Switch Application Connected to a Microcontroller Sensor Bridge C3 47nF C4 C VSSE AOUT VBN VBR_B VBP VBR_T IRTEMP ZSSC33/ZSSC336 VDDE VDD n.c. SCL SDA VSSA C 00nF C 00nF V SUPP +4.5V to +5.5V R kω 3 V SUPP GPIO 4 V SUPP µc 06 Integrated Device Technology, Inc. 9 March 30, 06
10 ZSSC33 / ZSSC336 Application Note - Automotive Sensor Switch Figure 3.3 Alarm Window Sensor Bridge C3 47nF C4 C VSSE AOUT VBN VBR_B VBP VBR_T IRTEMP ZSSC33/ZSSC336 VDDE VDD n.c. SCL SDA VSSA C 00nF C 00nF V SUPP +4.5V to +5.5V R V Reference R V Reference R Comp - C6 Comp RL Comparators with open-collector outputs Both outputs are HIGH when the voltage is within the required limits. Figure 3.4 Adding Hysteresis to the put C3 47nF Sensor Bridge C4 C VSSE AOUT VBN VBR_B VBP VBR_T IRTEMP ZSSC33/ZSSC336 VDDE VDD n.c. SCL SDA VSSA C 00nF C 00nF V SUPP +4.5V to +5.5V R V - Reference R3 C6 R Vin - Comp + RH Vout RL 06 Integrated Device Technology, Inc. 0 March 30, 06
11 ZSSC33 / ZSSC336 Application Note - Automotive Sensor Switch 4 Related Documents Document ZSSC33x Functional Description ZSSC33x Evaluation Kit Description ZSSC33x High Voltage Protection Description ZSSC33 Documents ZSSC33 Feature Sheet ZSSC33 Data Sheet ZSSC 336 Documents ZSSC336 Feature Sheet ZSSC336 Data Sheet Visit IDT s website or contact your nearest sales office for the latest version of these documents. 5 Glossary Term AEC EEPROM ESD SIL Description Automotive Electronics Council Electrically Erasable Programmable Read Only Memory Electrostatic Device Safety Integrity Level 06 Integrated Device Technology, Inc. March 30, 06
12 ZSSC33 / ZSSC336 Application Note - Automotive Sensor Switch 6 Document Revision History Revision Date Description.00 May 30, 0 First release. March 30, 06 Changed to IDT branding. Corporate Headquarters 604 Silver Creek Valley Road San Jose, CA Sales or Fax: Tech Support DISCLAIMER Integrated Device Technology, Inc. (IDT) reserves the right to modify the products and/or specifications described herein at any time, without notice, at IDT's sole discretion. Performance specifications and operating parameters of the described products are determined in an independent state and are not guaranteed to perform the same way when installed in customer products. The information contained herein is provided without representation or warranty of any kind, whether express or implied, including, but not limited to, the suitability of IDT's products for any particular purpose, an implied warranty of merchantability, or non-infringement of the intellectual property rights of others. This document is presented only as a guide and does not convey any license under intellectual property rights of IDT or any third parties. IDT's products are not intended for use in applications involving extreme environmental conditions or in life support systems or similar devices where the failure or malfunction of an IDT product can be reasonably expected to significantly affect the health or safety of users. Anyone using an IDT product in such a manner does so at their own risk, absent an express, written agreement by IDT. Integrated Device Technology, IDT and the IDT logo are trademarks or registered trademarks of IDT and its subsidiaries in the United States and other countries. Other trademarks used herein are the property of IDT or their respective third party owners. For datasheet type definitions and a glossary of common terms, visit All contents of this document are copyright of Integrated Device Technology, Inc. All rights reserved. 06 Integrated Device Technology, Inc. March 30, 06
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