Features • • • • • • • • • Input Voltage: 8 V to 40 V Output Voltage Linear Regulator: 5 V/50 mA/3 mA ON_NOFF (High Active) Input Window Watchdog OFF Mode Quiescent current < 10 µA Standby Mode Quiescent Current < 30 µA Temperature Range: -40° C to 125°C Reset Logic Select Pin Standby/OFF Mode Description The ATA6405 is a fully integrated system voltage supply IC. The device is designed for the 12/24 V board voltage system in a motor vehicle. In order to minimize power consumption, a switching regulator generates a voltage for supplying the internal linear regulator with a 5 V output voltage for microcontrollers. To monitor the microcontroller, provision has been made for a window watchdog feature incorporating a reset logic function. The voltage system IC has three modes: active, Standby and OFF. One control input serves to facilitate the selection between the active and Standby modes. Another input permits the selection between the Standby and OFF modes. In the OFF mode, a maximum quiescent current of less than 10 µA flows through the system and in Standby mode quiescent current less than 30 µA. 12/24 V System Power Supply IC ATA6405 Preliminary Rev. 4737B–AUTO–08/04 Block Diagram/Application Circuit D1 K30 2 × 22 µF + 47 nF (9.0 to 40.0 V) VB2 VLR (5 V) Microcontroller CVB + VB1 SCN_OUT NTRIG Window watchdog Period 11.2 ms Window 6.40 ms VVB Monitor SR0 Buck Converter 7.55 V 6.5 V/50 mA LX1 LX2 LX3 L1 300 µH ResetLogic VSR Regulator LR1 NRES 5 V (±2%)/50 mA VLR 5V ON_NOFF ON OFF + CVSR Bandgap, Current/Bias Oscillator 400 kHz Control TST_SCN TST_TE TCLK SCN_IN NSTB ON I_SET Standby + Regulator Temperature Monitor 165°C AGND DGND LR2 Standby: 5 V/3 mA PGND CVLR 47 µF + 47 nF 2 × 33 µF + 47 nF PGND R1 20k Mode Select Application Notes 1. It is strongly recommended to connect the blocking capacitors at VB1, VB2, VSR, VLR as closely as possible to the pins PGND, AGND. 2. It is strongly recommended to use capacitors with very low ESR. 3. The 47 nF capacitors are of ceramic types. 4. It is strongly recommended to connect the resistor R1 as closely as possible to the pins I_SET and AGND. 2 ATA6405 [Preliminary] 4737B–AUTO–08/04 ATA6405 [Preliminary] Pin Configuration NC NRES NTRIG SCN_OUT SCN_IN TCLK NC Figure 1. Pinning QFN28 7x7 (pitch 0.8 mm) 28 27 26 25 24 23 22 DGND 1 21 NC I_SET 2 20 TST_SCN AGND 3 19 TST_TE VLR 4 18 NSTB VSR 5 17 ON_NOFF PGND 6 16 VB2 PGND 7 15 VB1 8 9 10 11 12 13 14 NC NC LX3 LX2 LX1 NC NC MLP 7x7mm 0.8mm pitch ATA6405 28 lead Pin Description Pin Symbol 1 DGND Grounding connection for digital stages Function 2 I_SET Connection for reference resistance 3 AGND Grounding connection for analog stages 4 VLR Output from LR1 Output from LR2 5 VSR Feedback input of switching regulator and input of linear regulator LR1 6 PGND Grounding connection for power stages 7 PGND Grounding connection for power stages 8 NC Not connected 9 NC Not connected 10 LX3 Switching output of switching regulator 11 LX2 Switching output of switching regulator 12 LX1 Switching output of switching regulator 13 NC Not connected 14 NC Not connected 15 VB1 Voltage supply 16 VB2 Voltage supply 17 ON_NOFF Input for selecting between ON and OFF or Standby mode Remarks 5 V/50 mA (ON_mode) 5 V/3 mA (Standby mode) Connector to VB ⇒ ON mode LOW ⇒ OFF mode 3 4737B–AUTO–08/04 Pin Description (Continued) Pin Symbol Function Remarks 18 NSTB Input for selecting the OFF- or Standby mode Connector to VB ⇒ OFF mode LOW ⇒Standby mode 19 TST_TE Connections for test purposes 20 TST_SCN Connections for test purposes 21 NC Not connected 22 NC Not connected 23 TCLK Connections for test purposes 24 SCN_IN Connections for test purposes 25 SCN_OUT 26 NTRIG Trigger input for watchdog Low - active, slope L/H 27 NRES Reset output Low - active 28 NC Connections for test purposes Not connected Functional Description The system voltage supply IC described here is designed for the 12/24V board voltage supply systems in motor vehicles. To minimize power losses, provision is made for a step-down type switching regulator to transform the battery voltage to the lowest possible initial value so as to supply the internal linear regulator with 5V. The linear regulator is equipped with monitors controlling different voltages, currents and the temperature. Accuracy of the regulators and monitors is provided by a bandgap acting in conjunction with an external reference resistance on pin I_SET. In addition to the voltage regulators, the system is further enhanced by a monitoring and control feature for microcontrollers designed in the form of a window watchdog geared to the reset logic system. A switching input is provided for switching the system on and off. Another input controlling the switched-off state serves to determine whether the system is to be completely switched off (OFF mode) or whether the Standby mode is to be enabled, in which case minimum supply of the microcontroller on pin VLR is maintained. General Features This product is designed for continuous operation on terminal 30 of a motor vehicle board supply system. Accordingly, attention has been paid to ensuring minimum current consumption in the OFF mode. The rise in supply voltage when connected to terminal 30 or when connecting up a battery must not be allowed to fall below 2V/ms. This applies to the process of assembly and not to normal operation where minimum supply voltage is ensured even when power fades occurs during the starting phase. Operating Modes: ON/OFF/Standby These operating modes can be set via the ON_NOFF and NSTB pins. Connecting pin ON_NOFF to pin VB results in the ON mode being set irrespective of the NSTB pin. If the ON_NOFF pin remains unconnected, either the OFF mode or Standby mode will be set depending on the NSTB pin. Connection of NSTB to VB results int the OFF mode being set. On the other hand, connecting the NSTB pin to ground potential will result in the Standby mode being set provided that the ON mode was previously enabled. The NSTB pin is designed for permanent wiring depending on the desired mode of functioning. 4 ATA6405 [Preliminary] 4737B–AUTO–08/04 ATA6405 [Preliminary] Operating Sequence Whenever a voltage having a typically greater value than 7.55 V is applied to the VB pin, the switching regulator can be run up (after a brief initialization phase of approximately 100 µs) by switching from the OFF mode to the ON mode. As soon as transient build-up is just about to transpire, the LR1 linear regulator is automatically switched on, applying a typical output voltage of 5.6 V to the VSR pin. As long as transient build-up has not yet taken place on the LR1 linear regulator, a reset will be put out on the NRES pin (reset for the microcontroller supplied by the linear regulator). As soon as the typical output voltage of 4.75 V has been exceeded on the VLR pin, the reset will terminate with a delay of approximately 10 ms. This period covers the transient build-up phase on the oscillator of the microcontroller. In the event pin VLR falls below the typical limiting values, a reset will be put out. In the event of excess temperature occurring or if the supply voltage falls below the specified limiting value, both voltage regulators will be immobilized. This will also lead indirectly to the reset state, which will remain in force until pin VB voltage drops to approximately 2.5 V. The further sequence of operations after termination of the ON mode unleashed by switching to ON_NOFF will depend on the wiring of the NSTB pin (also refer to the previous description). The switching regulator and linear regulator are switched off irrespective of the NSTB pin. If the Standby mode has been selected, the first linear regulator (LR1) will be substituted by a second linear regulator of lower power capacity, this being fed directly via the VB pin. For minimized current consumption all further functions will switched off. These are the internal supply, the oscillator with the related voltage monitoring controllers, the temperature controlling monitor and the watchdog. Enabling of the Standby mode is only possible after an ON-MODE phase. Initial application of the supply voltage will prove insufficient. With the transfer from the Standby to the ON mode, activated by the switching pin ON_NOFF, the pin NRES remains high in the first time (with external resistor). Due to the functionality there is the same procedure as the one at the end of the generation of the reset output (LOW HIGH transmission at NRES). Also see section “RESET” and “Watchdog” on page 6. Reset The purpose of the reset function is to transform the microcontroller to be monitored into a predefined state. In order to achieve this, the NRES pin is drawn internally (or externally) on ground potential. In the OFF mode the reset signal is active permanently. After switching into the ON mode the reset signal remains for 10 ms, typically, after transient build-up of all voltage regulators. Outputting of the reset in the ON mode may be triggered due to a variety of different reasons. In case of undervoltage at pin VLR the reset occurs immediately. The turn-off delay is typically 10 ms and starts with the end of the event. The activation of the watchdog generates a reset of 10 ms. Undervoltage at pin VB or overtemperature will switch off all voltage regulators and a reset is generated due to undervoltage at pin VLR. With the changeover from the ON mode to the Standby mode the reset is locked in any time. The reset is also locked with the return to the ON mode as long as all voltage regulators have finished the transient build-up. 5 4737B–AUTO–08/04 Oscillator The task of the oscillator is to provide system timing for the switching regulator as well as a timing basis for all counting and delay functions, including those of the watchdog system. It is designed in the form of an RC oscillator, the frequency of which is governed by the tolerances of integrated capacity and the properties of external resistance on pin I_SET. Temperature dependence is better than 300 ppm/°C subject to corresponding selection of external resistance. To minimize interference in the radio-broadcasting band, the typical frequency has been permanently set to 400 kHz. Switching Regulator SR From the variable supply voltage present on the VB pin, the SR switching regulator generates a typical output voltage of 6.5 V on the VSR pin. The latter acts as a feedback input for the switching regulator and also as an input for the LR1 linear regulator. Typical loading capacity is laid out for 50 mA. The current limitation is fixed at 100 mA. An external capacitor is needed to suppress transients and to ensure a normal input voltage for LR1. The ESR of the capacitor has to be considered due to the ripple. If the ripple is too high the voltage monitor at pin VSR will not release LR1. The operating frequency is bled off from an integrated RC oscillator, whose frequency has been set at 400 kHz. This frequency serves to ensure minimum possible interference in the radio broadcasting bands. In this context, the slope rate on the circuit output has been selected in such a way that an optimum state is achieved between the efficiency factor and freedom from interference. Linear Regulators LR1, LR2 The linear regulator LR1 provides a typical supply voltage of 5.0 V on the VLR pin. The input voltage is provided on the VSR pin (output of switching regulator). An internal current limiter is set to approximately 70 mA. This regulator is only enabled in the ON mode. When changing from the ON mode to the Standby mode, linear regulator LR2 is enabled, which draws its input current directly from the VB pin, thus maintaining the typical output voltage of 5.0 V on the VLR pin up to a current of approximately 3 mA. The current limitation is fixed at 7 mA. An external capacitor needs to be added at pin VLR in accordance to the load of the microcontroller to avoid generating a reset of the voltage monitor controller. Pin SCN OUT A high level in the ON mode at this pin indicates undervoltage detection at pin VB or overtemperature of the device. Watchdog The watchdog anticipates a triggering signal from the microcontroller at the NTRIG input within a recurrent time window. On the basis of this low-active (or alternatively highactive) signal, evaluation of the low slope (or high slope) takes place, however only if a minimum dwell time ttrig is exceeded. If no such triggering signal is received, output of a reset will take place. Alternatively, outputting of a reset may take place if ttrig exceeds a predefined maximum value. The timing basis of the watchdog is provided by the internal RC oscillator. 6 ATA6405 [Preliminary] 4737B–AUTO–08/04 ATA6405 [Preliminary] Detailed Description of the Watchdog Function Figure 2. Watchdog Sequence tres NRES td td t1 t2 t1 t2 NTRIG ttrig WD sequence (typically): t1 = 8.0 ms t2 = 6.4 ms After completion of the reset function (low/high slope on NRES) a lead time td follows (e.g. for setups) of typically 40 µs before the actual watchdog sequence begins. Times t1 and t2 form a part of the watchdog sequence and assume a fixed relationship to one another. A triggering signal from the microcontroller is anticipated within the timeframe of t2 (6.4 ms). Of decisive importance in this case is the low/high slope after the minimum dwell time t trig of typically 40 µs. This slope serves to restart the watchdog sequence. Should the triggering signal fail to emerge, the NRES output will be drawn on ground potential applying the time duration tres of typically 10 ms. A reset situation is likewise unleashed if the triggering signal emerges within the timeframe of t1 (8 ms) or alternatively if ttrig exceeds the time of 100 µs. An example of how the above time values are defined is given in the first variant. However, the time values can, on principle, be selected by the mask function. A 6-bit counter is available for ttrig and a 16-bit counter for td, t1, t2, tres. In the same way, orientation of the trigger pulse (low- or high-active) is selectable by the mask function. The original time basis is defaulted by the internal oscillator. The time basis Twd for the watchdog is obtained by applying a division ratio of 1:4. All the times indicated above are multiples of Twd. Oscillator cycle duration: Tosc = 1/fosc = 1/400 kHz ±Tol. = 2.50 µs ±Tol. Time basis for watchdog: Twd = 4 x Tosc = 10 µs (typical) The above time values and oscillator tolerances result in a typical triggering frequency based on T = 10.56 ms ±0.94 ms. 7 4737B–AUTO–08/04 Absolute Maximum Ratings Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Parameters Symbol Min. Max. Unit Supply voltage Vvb -0.35 40 V Output voltage LX Vout -1.0 Vvb + 0.35 V Input voltage regulator LR Vin -0.35 8 + 0.35 V Output voltage regulator LR Vout -0.35 Vsr + 0.35 V Output voltage pin NRES Vout -0.35 Vvlr + 0.35 V Output current pin I_SET Iout 1.0 mA Input voltage NTRIG Vin -0.35 Vvlr + 0.35 V Input voltage ON_NOFF, NSTB Vin -0.35 Vvb + 0.35 V Junction temperature Tj -40 150 °C Storage temperature Tstg -55 150 °C Thermal Resistance Parameters Junction to case (1) Junction to ambient Note: Symbol Value Unit RthJC 10 K/W RthJA 130 K/W 1. Chip soldered on metal plate Operating Range Parameters Symbol Min. Max. Unit Supply voltage Vvb 8 40 V Ambient Temperature Tamb -40 +125 °C 8 ATA6405 [Preliminary] 4737B–AUTO–08/04 ATA6405 [Preliminary] Electrical Characteristics Vvb = 8 V to 40 V; Tamb = -40°C to 125°C; reference point is pin AGND. No. 1 Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit Type* Power Supply 1.1 Input current ON mode No load on SR, LR VB Ivb 10 mA A 1.2 Input current OFF mode VB Ivb 10 µA A 1.3 Input current Standby mode VB Ivb 30 µA A 1.4 Dissipated power ON mode P 0.5 W D 2 2.1 3 3.1 4 4.1 5 Voltage Regulator SR Output voltage IVSR = 0 to 50 mA VSR VSR 6.1 6.5 7.1 V A IVLR = 0 to 50 mA VLR VLR1 4.90 5V 5.10 V A IVLR = 0 to 3 mA VLR VLR2 4.50 5V 5.50 V A 7.4 7.55 7.7 V A V A V A V A V A Voltage Regulator LR1 Output voltage 5V Voltage Regulator LR2 Output voltage 5V Voltage Monitor VB 5.1 Enable threshold voltage VB Vth 5.2 Hysteresis VB Vhy 6 Voltage Monitor VSR 6.1 Enable threshold voltage VSR Vth 6.2 Hysteresis VSR Vhy 7 0.1 5.48 5.6 5.72 0.1 Voltage Monitor VLR 7.1 Enable threshold voltage VLR Vth 7.2 Hysteresis VLR Vhy 0.1 V A 8 4.65 4.75 4.85 Temperature Monitor 8.1 Disable threshold Tth 165 °C C 8.2 Hysteresis Thy 15 °C C 9 9.1 Logic High input voltage NTRIG Vih 4.0 V A V A µA A 9.2 Low input voltage NTRIG Vil 0.4 9.3 Input current Vin = 5 V NTRIG Iin 1.0 9.4 Input current Vin = 0 V NTRIG Iin -1.0 µA A 9.5 High input voltage ON_NOFF, NSTB Vih 7.0 V A 9.6 Low input voltage ON_NOFF, NSTB Vil 0.4 V A 9.7 Input current Vin = 40 V ON_NOFF Iin 197 983 µA A 9.8 Input current Vin = 4 V ON_NOFF Iin 3.1 15 µA A 9.9 Input current Vin = 0.4 V ON_NOFF Iin 0.5 1 µA A *) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter 9 4737B–AUTO–08/04 Electrical Characteristics (Continued) Vvb = 8 V to 40 V; Tamb = -40°C to 125°C; reference point is pin AGND. No. Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit Type* 9.10 Input current Vin = 40 V NSTB Iin 0.5 1 µA A 9.11 Input current Vin = 4 V NSTB Iin 0.5 1 µA A 9.12 Input current Vin = 0.4 V NSTB Iin -2 -1 µA A 9.13 Low output voltage Iout = -1 mA NRES Vol 0.4 V A 9.14 High output voltage Iout = -5 mA SCN_OUT Voh V A 9.15 Low output voltage Iout = 5 mA SCN_OUT Vol 0.4 V A LX Tosc 2.0 2.50 3.0 µs A 8.0 10.0 12.0 4.6 10 Oscillator/Watchdog 10.1 Oscillator period time 10.2 WD time base Twd µs D 10.3 WD pre-period td 4 Twd D 10.4 WD disable time t1 800 Twd A 10.5 WD enable time t2 640 Twd A Twd A Twd A 10.6 Reset-out time 10.7 Trigger pulse 1000 tres NTRIG ttrig 4 10 *) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter Noise and Surge Immunity Parameter Test Conditions Value Conducted interferences ISO 7637-1 Level 4 Interference suppression VDE 0879 Part 2 Level 5 ESD (Human Body Model) MIL-STD-883D Method 3015.7 ±1.5 kV ESD (Charge Device Model) ESD STM5.3.1 - 1999 ±500 V 10 ATA6405 [Preliminary] 4737B–AUTO–08/04 ATA6405 [Preliminary] Ordering Information Extended Type Number ATA6405-PKQ Package QFN28 Remarks Voltage Regulator Package Information 11 4737B–AUTO–08/04 Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 487-2600 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 Asia Room 1219 Chinachem Golden Plaza 77 Mody Road Tsimshatsui East Kowloon Hong Kong Tel: (852) 2721-9778 Fax: (852) 2722-1369 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 Atmel Operations Memory 2325 Orchard Parkway San Jose, CA 95131, USA 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 Microcontrollers 2325 Orchard Parkway San Jose, CA 95131, USA 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 ASIC/ASSP/Smart Cards 1150 East Cheyenne Mtn. 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