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| Features * * * * * * * Watchdog Adjustable Over- and Undervoltage Detection of Vcc = 5 V Standby Modes On/Off via Ignition Pin VKL15 Internal Time Delay for Output Signal Push-pull Output Driver Interference and Damage Protection According to ISO/CD 7637 ESD Protection Description The ATA6025 is a monolithic circuit based on Atmel's smart power BCD60-III technology. It is a universal IC for monitoring basic functions of an automotive application. It is possible to monitor the battery voltage (VKL15) and an external 5 V voltage regulator. With the independent watchdog the correct function of a microcontroller can be observed. If a failure occurs, the output NOTL switches to high after a time delay. During standby mode the current consumption is reduced to a minimum. Figure 1. Block Diagram RREF VBG VCC oscillator on chip trimming OSC VCCH VCC over- & undervoltage detection IBias standby mode BIAS current 5V regulator VBG POR & Bandgap Reference VB monitoring VDD POR VBOK NOTL Short circuit 2.5 mA protected VB Watchdog IC ATA6025 VCCL up &down counter 400ms NL High at counter end NL Low at counter zero POR VDD VKL15 VDD NVKL15 failure watchdog fwd Watchdog WD standby mode OSC Input Test mode 1 or 2 CLK High at counter zero OSC divided by 4 GND 4716B-AUTO-06/03 1 Pin Configuration Figure 2. Pinning SO8 NOTL VB GND RREF 1 2 3 4 8 7 6 5 VCC CLK WD VKL15 Pin Description Pin 1 2 3 4 5 6 7 8 Symbol NOTL VB GND RREF VKL15 WD CLK VCC Function Push-pull output driver Voltage supply Ground Reference voltage to adjust oscillator frequency via resistor Rset Input for standby modes on/of via ignition KL15 Input for watchdog signal from microcontroller Clock output signal, open drain Input for monitoring 5V power supply 2 ATA6025 4716B-AUTO-06/03 ATA6025 Functional Description Voltage Supply The IC can be supplied directly from Vbattery. If the voltage at the VB pin is lower than the threshold of VVBlo = 5.76 V, the internal signal VBOK is set to low. If VBOK is low, the monitor function of the IC is completely disabled and the output NOTL is swiched off in all cases (see Figure 5). If the voltage at pin VKL15 is low, the IC is in standby mode and reduces the current consumption at pin VB < 100 A. Oscillator The frequency fCLK of the internal oscillator is defined by the external resistor RSET and the internal capacitor. Thus, it is possible to vary the oscillator frequency between 4 kHz and 24 kHz. This input is used to monitor the battery voltage at ignition pin VKL15. If the voltage VKL15lo < 1.8 V, the internal signal NVKL15 is set to high (see Figure 5). The IC switches to standby mode. During standby mode the monitor function is disabled and the output NOTL is switched off after the time delay tDelay. If the output NOTL is switched on and the voltage at VKL15 switches suddenly to low, the internal timer starts and switches the NOTL off after a time delay of tDelay = 400 ms. VKL15 Monitoring VCC Over-/Undervoltage Via the VCC input an external 5 V voltage regulator is continuously monitored. If the voltage at pin VCC exceeds the voltage of VCChon > 6.3 V, the failure bit VCCH is set high. If the voltage at pin VCC decreases to a value below VCClon < 4 V, the internal failure bit VCCL will be set to high (see Figure 3). This failure bit starts the internal counter and switches the output NOTL on after the time delay of typically tDelay= 400 ms. If the VCC voltage is inside the tolerance VCCloff < VVCC < VCChoff the failure signal will be reset and the internal counter counts back to zero. After a time delay of typically tDelay = 400 ms, the output NOTL is switched off again. Watchdog A microcontroller can be monitored by a digital window watchdog which accepts an incoming trigger signal TWD of a constant frequency at pin WD for correct operation. If the pulse width T WD between two alternate edges exceeds the time window of ToWD > 8.9 ms or if there is no watchdog signal, the failure signal fwd (failure watchdog) is set. In case the pulse width TWD between two alternate edges falls below the time window of TuWD < 2.6 ms, the failure signal fwd (failure watchdog) is also set. With this fwd signal the internal up counter is activated and after a time delay of tDelay = 400 ms, the output NOTL is switched to high. If NOTL is high, 16 successive correct watchdog signals TWD within the pulse width of TuWD < TWD < ToWD are needed to create the internal signal nfwd (no failure watchdog) to start the down counter. After a time delay of tDelay= 400 ms, the output NOTL is switched to low (see Figure 4). 3 4716B-AUTO-06/03 Time Delay The internal time delay is generated by an up/down counter. The clock for the counter is disabled if the voltage at the supply pin VB < 5.76 V. In this case, the internal signal VBOK will be set to low and the output NOTL is directly switched to low. The direction of counting is set by the watchdog or VCC over- and undervoltage detection. If the VCC monitoring detects an undervoltage condition, the failure signal VCCL (VCC low voltage) is set and starts the up counter. If the VCC monitoring detects an overvoltage condition, the failure signal VCCH (VCC high voltage) is set and starts the up counter. A failure at the watchdog sets the internal fwd signal (failure watchdog) to high and starts the up counter. If the counter's final value is reached, a Flip Flop is set and switches the output NOTL to high. If no failure signal is set and the window watchdog has counted successive 16 alternate WDI edges then the down counter is started. If the counter reaches the zero value the Flip Flop receives a reset command and switches the output NOTL off. The down counter is also started if the voltage at input VKL15 is low and switches the output NOTL after tDelay = 400 ms to low (see Figure 5). Output NOTL If the voltage at VKL15 is high and if a failure signal is set, the output NOTL switches to high after the internal time delay. The output is short circuit protected with a current limitation of ISCNOTL = 15 mA. The maximum output voltage is limited to VCNOTL = 22 V (see Figure 6). Test Mode The pin CLK is normaly open or connected to GND. If the internal clock frequency is to be checked, the CLK pin has to be connected with an external resistor Rex = 5 kW to a 5 V supply. The measured value is the clock frequency divided by four. Truth Table VVB VVB < 5.76 V VVCC Do not care VVCC < 4 V WDI Do not care Do not care Do not care 7.26 < VVB < 17.5 V 4.8 V < VVCC < 5.2 V VVCC > 6.3 V VVCC > 6.3 V VVCC < 4 V No watchdog failure Watchdog failure Do not care Do not care Do not care 22 V< VVB < 40 V 4.8 V < VVCC < 5.2 V VVCC > 6.3 V VVCC > 6.3 V No watchdog failure Watchdog failure Do not care VKL15 Low High Low High Low High High Low High Low High Low High High Low High Mode Standby, NOTL low NOTL low Standby, NOTL low NOTL high Standby, NOTL low NOTL low NOTL high Standby, NOTL low NOTL high Standby, NOTL low NOTL high (maximum 22 V) Standby, NOTL low NOTL low NOTL high (maximum 22 V) Standby, NOTL low NOTL high 4 ATA6025 4716B-AUTO-06/03 ATA6025 Absolute Maximum Ratings Parameters Supply voltage Voltage at pins VCC, WD Voltage at pins RREF, CLK Voltage at pin NOTL Voltage at pin KL15 (in series with external resistor of 50 kW 1%) Maximum current at pin VCC Maximum current at pin VB Maximum current in pins CLK, RREF, VKL15, NOTL Maximum current at pin WD ESD classification HBM ESD S.5.1 ESD classification MM JEDEC A115A Power dissipation Chip temperature Operating ambient temperature Storage temperature IWD all pins all pins PV TJ Tamb TStg -40 -40 -55 Symbol VVB VVCC, VWDI VRREF, VCLK VNOTL VKL15 IVCC IVB Min. -0.3 -0.3 -0.5 -0.3 -0.1 -100 -10 -100 -1 2000 200 300 +150 +125 +150 Max. +40 +30 +6 +22 +40 +0.1 +10 +100 +1 Unit V V V V V mA mA mA mA V V mW C C C Thermal Resistance Parameters Thermal resistance from junction to ambient Symbol RthJA Value 160 Unit K/W 5 4716B-AUTO-06/03 Electrical Characteristics VVB = 7.2 to 17.5 V, RKL15 = 50 kW 1%, RSET = 22 kW 1%, Tamb = -40 to 125C, unless otherwise specified No. 0 Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit Type* Current Consumption and ESD Clamping VVKL15 > 4.5 V Current consumption in VVB =17.5 V normal mode NOTL = high INOTL = -2.5 mA Standby: Current consumption in VVKL15 < 1.8 V standby mode VVB = 17.5 V NOTL = Iow Negative ESD clamping to GND, IVB = -10 mA pin VB Positive ESD clamping pin RREF Positve ESD clamping pin CLK Positve ESD clamping pin VB Positve ESD clamping pin VKL15 Positve ESD clamping pin NOTL Positve ESD clamping pin WD Positve ESD clamping pin VCC Reference Voltage Voltage at RREF Possible values of resistor RREF Oscillator Oscillator frequency Oscillator frequency is variable in a range VB Monitoring High level threshold Low level threshold Hysteresis 2 2 2 VVBhi VVBlo VVBhys 5.94 5.76 0.2 7.26 7.04 V V V A A A RSET = 22 kW 1% at pin CLK with pull-up-resistor to +5 V RSE = 10 kW to 50 kW 1% 7 fCLK fCLK 9 10 11 kHz A 4 4 VRREF RRREF 1.14 10 1.22 22 1.3 50 V kW A A to GND, IRREF = 5 mA to GND, ICLK = 20 mA to GND, IVB = 5 mA to GND, IVKL15 = 1.6 mA to GND, INOTL = 20 mA to GND, IWD = 0.7 mA to GND, IVCC = 0.5 mA 0.1 2 IVB 10 mA A 0.2 2 IVBstby 100 A A 0.3 0.4 0.5 0.6 0.7 0.8 0.9 0.10 1 1.1 1.2 2 2.1 2 4 7 2 5 1 6 8 VNVB VPRREF VPCLK VPVB VPVKL15 VPNOTL VPWD VPVCC -1.4 4 6 41 41 31 35 35 -0.3 8 10 65 65 55 55 55 V V V V V V V V A A A A A A A A 2.2 4 4.1 4.2 4.3 7 3.96 24.2 kHz A *) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter 6 ATA6025 4716B-AUTO-06/03 ATA6025 Electrical Characteristics (Continued) VVB = 7.2 to 17.5 V, RKL15 = 50 kW 1%, RSET = 22 kW 1%, Tamb = -40 to 125C, unless otherwise specified No. 5 5.1 5.2 5.3 5.4 6 Parameters VKL15 Monitoring Input resistor at VKL15 Low voltage threshold High voltage threshold Hysteresis VCC Monitoring Pull-down resistor to GND at pin VCC Undervoltage detection low level Undervoltage detection high level Overvoltage detection high level Overvoltage detection low level Hysteresis of underand overvoltage detection Oscillator Test Pull-down-resistor Saturation voltage Short current CLK = high, VCLK = 0 to 4.5 V ICLK = 1.6 mA, CLK = low VCLK = 5 V, CLK = low INOTL = 1.8 mA NOTL off VNOTL = VVB NOTL off 17.5 V < VVB < 30 V INOTL = -2.5 mA NOTL on 7 7 7 RpdCLK VsCLK IscCLK 6 15 0.4 10 kW V mA A A A VVB = 17.5 V VVKL15 = 0 V or VVKL15 = VVB VVCC = 5 V RKL15 = 50 kW 1% RKL15 = 50 kW 1% 5 5 5 5 RiKL15 VKL15lo VKL15hi VKL15hys 0.2 18 1.8 4.5 1 70 kW V V V A A A A Test Conditions Pin Symbol Min. Typ. Max. Unit Type* 6.1 8 RpdVCC 50 350 kW A 6.2 6.3 6.4 6.5 8 8 8 8 VCCIon VCCIoff VCCIoff VCChoff VCChys 4 4.8 6.3 5.2 V V V V A A A A 6.6 9 9.1 9.2 9.3 10 10.1 10.2 8 0.2 V A Push-pull Output NOTL Saturation voltage NOTL switched off Short current NOTL if switched off Maximum output voltage NOTL 1 1 VsatNOTLoff IscNOTLoff 1 15 V mA A A 10.3 1 VNOTLmax 17.5 22 V A 10.4 VsatNOTLon = Saturation voltage VVB - VNOTL NOTL switched on; V = VVB guaranteed down to VB VKL15 INOTL = -2.5 mA low level threshold NOTL on Short current NOTL if switched onf VNOTL = 0 V NOTL = on 1 VsatNOTLon 0.25 V A 10.5 1 IscNOTLon -50 mA A *) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter 7 4716B-AUTO-06/03 Electrical Characteristics (Continued) VVB = 7.2 to 17.5 V, RKL15 = 50 kW 1%, RSET = 22 kW 1%, Tamb = -40 to 125C, unless otherwise specified No. 10.7 Parameters Time delay of internal up and down counter Rise time at pin NOTL switch on Fall time at pin NOTL switch off Watchdog Pull-down-resistor Voltage threshold low Voltage threshold high Hysteresis Acceptable low WD pulse width for failure Acceptable high WD pulse width for failure VhysWD = VhighWD - VlowWD pulse = high or low RSET = 22 kW 1% pulse = high or low RSET = 22 kW 1% VVB = VKL15 = 17.5 V 6 6 6 6 6 6 RpdWD VlowWD VhighWD VhysWD TuWD ToWD 0.5 2.6 7.1 3 8 3.3 8.9 30 1 3.5 200 kW V V V ms ms A A A A A A CNOTL 200 pF VNOTL from low = 10% to high = 90% VVB CNOTL 200 pF VNOTL from high = 90% to low = 10% V(VB) Test Conditions Pin 1 Symbol tDelay trNOTL Min. 360 Typ. 400 Max. 450 Unit ms Type* A 10.8 1 5 s A 10.9 11 11.1 11.2 11.3 11.4 11.5 11.6 1 tfNOTL 5 s A *) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter 8 ATA6025 4716B-AUTO-06/03 ATA6025 Diagrams Figure 3. VCC Monitoring Diagram V(VCC) VCChon VCChoff VCCloff VCClon t low VCCH high VCCL Figure 4. Watchdog Timing Diagram no WD or TWD >ToWD TuWD < TWD < To WD 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 TWD 9 4716B-AUTO-06/03 Figure 5. Time Delay Diagram VBOK NVKL15 high low VCCH VCCL fwd NOTL tDelay tDelay tDelay tDelay tDelay tDelay Figure 6. Push-pull Output NOTL V(NOTL) VNOTLmax 22 V VBlo VBhi 17.5 to 22 V V(VB) 10 ATA6025 4716B-AUTO-06/03 ATA6025 Figure 7. Application Circuit Rset RREF VBG VCC oscillator on chip trimming OSC VCCH VCC over- & undervoltage detection IBias standby mode BIAS current 5 V regulator VBG POR & Bandgap Reference VB monitoring VDD POR VBOK NOTL Short circuit 2.5 mA protected VB CVB2 100 nF CVB1 DKL30 220 F BYG10J KL30 VCCL up & down counter 400 ms NL High at counter end NL Low at counter zero POR VDD VKL15 RKL15 50k CKL15 100 nF VDD NVKL15 failure watchdog fwd Watchdog WD standby mode OSC Input Test mode 1 or 2 CLK High at counter zero OSC divided by 4 GND 11 4716B-AUTO-06/03 Ordering Information Extended Type Number ATA6025 Package SO8 Remarks Package Information Package SO8 Dimensions in mm 5.00 4.85 1.4 0.4 1.27 3.81 8 5 0.25 0.10 0.2 3.8 6.15 5.85 5.2 4.8 3.7 technical drawings according to DIN specifications 1 4 12 ATA6025 4716B-AUTO-06/03 Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131 Tel: 1(408) 441-0311 Fax: 1(408) 487-2600 Atmel Operations Memory 2325 Orchard Parkway San Jose, CA 95131 Tel: 1(408) 441-0311 Fax: 1(408) 436-4314 RF/Automotive Theresienstrasse 2 Postfach 3535 74025 Heilbronn, Germany Tel: (49) 71-31-67-0 Fax: (49) 71-31-67-2340 1150 East Cheyenne Mtn. Blvd. Colorado Springs, CO 80906 Tel: 1(719) 576-3300 Fax: 1(719) 540-1759 Regional Headquarters Europe Atmel Sarl Route des Arsenaux 41 Case Postale 80 CH-1705 Fribourg Switzerland Tel: (41) 26-426-5555 Fax: (41) 26-426-5500 Microcontrollers 2325 Orchard Parkway San Jose, CA 95131 Tel: 1(408) 441-0311 Fax: 1(408) 436-4314 La Chantrerie BP 70602 44306 Nantes Cedex 3, France Tel: (33) 2-40-18-18-18 Fax: (33) 2-40-18-19-60 Biometrics/Imaging/Hi-Rel MPU/ High Speed Converters/RF Datacom Avenue de Rochepleine BP 123 38521 Saint-Egreve Cedex, France Tel: (33) 4-76-58-30-00 Fax: (33) 4-76-58-34-80 Asia Room 1219 Chinachem Golden Plaza 77 Mody Road Tsimshatsui East Kowloon Hong Kong Tel: (852) 2721-9778 Fax: (852) 2722-1369 ASIC/ASSP/Smart Cards Zone Industrielle 13106 Rousset Cedex, France Tel: (33) 4-42-53-60-00 Fax: (33) 4-42-53-60-01 1150 East Cheyenne Mtn. Blvd. Colorado Springs, CO 80906 Tel: 1(719) 576-3300 Fax: 1(719) 540-1759 Scottish Enterprise Technology Park Maxwell Building East Kilbride G75 0QR, Scotland Tel: (44) 1355-803-000 Fax: (44) 1355-242-743 Japan 9F, Tonetsu Shinkawa Bldg. 1-24-8 Shinkawa Chuo-ku, Tokyo 104-0033 Japan Tel: (81) 3-3523-3551 Fax: (81) 3-3523-7581 literature@atmel.com Web Site http://www.atmel.com Disclaimer: Atmel Corporation makes no warranty for the use of its products, other than those expressly contained in the Company's standard warranty which is detailed in Atmel's Terms and Conditions located on the Company's web site. The Company assumes no responsibility for any errors which may appear in this document, reserves the right to change devices or specifications detailed herein at any time without notice, and does not make any commitment to update the information contained herein. No licenses to patents or other intellectual property of Atmel are granted by the Company in connection with the sale of Atmel products, expressly or by implication. Atmel's products are not authorized for use as critical components in life support devices or systems. (c) Atmel Corporation 2003. All rights reserved. Atmel (R) and combinations thereof are the registered trademarks of Atmel Corporation or its subsidiaries. Other terms and product names may be the trademarks of others. Printed on recycled paper. 4716B-AUTO-06/03 xM |
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