DATA SHEET AAT3532 MicroPowerTM Microprocessor Reset Circuit General Description Features The AAT3532 PowerManager is a member of Skyworks' Total Power Management IC (TPMIC™) product family. It is a fully integrated device for monitoring microprocessor activity, external reset, and power supply conditions. The device holds the microprocessor in a reset condition for a minimum of 250ms while VCC is established to ensure correct system start-up. A manual reset can be initiated via a de-bounced input pin. As an additional level of protection, the AAT3532 includes a watchdog timer which requires a periodic strobe input from the microprocessor to ensure correct operation. The AAT3532 has a programmable watchdog timer and voltage tolerance level. The quiescent supply current is extremely low, typically 23µA. • Adjustable 4.5V or 4.75V Voltage Monitor • 250ms (min) Reset Pulse Width • Low Quiescent Current: Typically 23µA • Adjustable Watchdog Timer (150ms, 600ms, or 1200ms) • De-bounced Manual Reset Input • Operates Down to 20ns Strobe Input Pulse Width • No External Components • Temperature Range: -40° to +85°C • Standard 8-Pin SOP Package • Pin Compatible with MAX1232 The AAT3532 is available in a Pb-free, 8-pin SOP package and is specified over the -40°C to +85°C temperature range. Applications •Automotive •Computers •Controllers • Embedded Systems • Intelligent Instrumentation • Telecom Equipment Typical Application VDD VDD VCC PBRST RST AAT3532 TD RESET INPUT µP RST ST I/O TOL GND Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202245A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 8, 2012 1 DATA SHEET AAT3532 MicroPowerTM Microprocessor Reset Circuit Pin Descriptions Pin # Symbol 1 PBRST 2 3 4 TD TOL GND 5 RST 6 RST 7 ST 8 VCC Function Push-button reset input. A de-bounced active low input for manual reset. Guaranteed to recognize inputs 20ms or greater. Watchdog time delay set input. See Table 1 for watchdog timeout selections. Tolerance set. Input selects 5% or 10% threshold detection. IC ground connection. Reset output (active high). Activated when either: VCC falls below the reset voltage threshold; PBRST is forced low; ST is not strobed within the minimum timeout period; or during power-up. Reset output (active low, open drain). Inverse of RST. Strobe input to watchdog timer. A pulse is required within the watchdog timeout period to prevent RST and RST entering active state. 5V supply. Pin Programming Selections Timeout TD Pin Min Typ Max GND Float VCC 62.5ms 250ms 500ms 150ms 600ms 1200ms 250ms 1000ms 2000ms Table 1: TD Pin Programming for Watchdog Timeout Selections. TOL Pin Tolerance VCC GND 10% 5% Table 2: Reset Voltage Threshold Programming Selections. Pin Configuration SOP-8 (Top View) 1 VCC 2 2 8 7 ST 3 6 RST 4 5 RST PBRST 1 TD 2 TOL GND Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202245A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 8, 2012 DATA SHEET AAT3532 MicroPowerTM Microprocessor Reset Circuit Absolute Maximum Ratings1 TA = 25°C, unless otherwise noted. Symbol VCC VI/O TA TS TLEAD VESD Description VCC to GND Voltage on I/O Pins Relative to GND Operating Temperature Range Storage Temperature Range Maximum Soldering Temperature (at leads, 10 sec.) ESD Rating2—HBM Value Units -0.5 to 6 -0.5 to (VCC+0.5) -40 to 85 -65 to 150 300 2000 V V °C °C °C V Value Units 100 1.25 °C/W W Thermal Characteristics3 Symbol QJA PD Description Maximum Thermal Resistance Maximum Power Dissipation 1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions specified is not implied. Only one Absolute Maximum Rating should be applied at any one time. 2. Human body model is a 100pF capacitor discharged through a 1.5kW resistor into each pin. 3. Mounted on an FR4 board. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202245A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 8, 2012 3 DATA SHEET AAT3532 MicroPowerTM Microprocessor Reset Circuit DC Electrical Characteristics VIN = 4.5V to 5.5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are TA = 25°C. Symbol Description VCC Supply Voltage IQ VCCTP IIL IOH IOL VIH VIL IRST Conditions Quiescent Current VCC = 5.5V Reset Threshold 5% Reset Threshold 10% Input Leakage ST, TOL Output Current RST2 Current RST2, RST ST and PBRST Input High ST and PBRST Input Low RST Output Leakage TOL = GND TOL = VCC 1 Min Typ Max Units 4.5 5.0 23 160 4.62 4.37 5.5 50 500 4.74 4.49 1.0 V CMOS Levels TTL Levels VOH = 2.4V VOL = 0.4V 4.50 4.25 -1.0 -8.0 10.0 2.0 -0.3 VCC + 0.3 0.8 1.0 VOH = VCC µA V µA mA mA V V µA AC Electrical Characteristics VIN = 4.5V to 5.5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are TA = 25°C. Symbol CIN COUT tPB tPBD tRST tST 4 Conditions Input Capacitance ST, TOL3 Output Capacitance RST, RST3 PBRST4 PBRST Delay Reset Active Time ST Pulse Width TA = 25ºC TA = 25ºC See Figure 2 See Figure 2 tTD ST Time-out Period tf tr VCC VCC VCC VCC tRPD tRPU 1. 2. 3. 4. Description Fall Time3 Rise Time3 Detect to RST High and RST Low Detect to RST Low and RST Open See Figure 3 TD Pin = 0V TD Pin = Open TD Pin = VCC 4.75V to 4.25V 4.25V to 4.75V VCC Falling VCC Rising Min 20 1 250 20 62.5 250 500 10 0 250 Typ Max Units 5 7 pF pF ms ms ms ns 4 610 20 1000 150 600 1200 250 1000 2000 5 610 50 1000 Measured with outputs open and ST toggling at 100kHz, 50% duty cycle. RST is an open drain output. Guaranteed by design and not subject to production testing. PBRST must remain low for greater than 20ms to guarantee a reset. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202245A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 8, 2012 ms µs µs µs ms DATA SHEET AAT3532 MicroPowerTM Microprocessor Reset Circuit Functional Block Diagram VCC TOL VCC Tolerance Select Reset Generator RST RST VREF PBRST ST De-Bounce Circuit Watchdog Timer Detector Watchdog Timer TD GND Applications Information Power Monitor The reset function monitors the VCC supply to ensure a microprocessor is correctly reset and is powered up into a known condition following a power supply failure. RST and RST will remain valid for VCC voltages down to 1.4V. The RST and RST pins are asserted whenever VCC drops below the reset threshold voltage. This voltage can be set by programming the TOL pin. Connecting TOL to VCC sets the 10% tolerance of the VCC supply (typically 4.37V for VCC = 5V). Connecting TOL to GND sets the 5% tolerance of the VCC supply (typically 4.62V for VCC = 5V). The reset pin is guaranteed to remain asserted for a minimum period of 250ms after VCC has risen above the reset threshold voltage. (See Figure 1.) The RST output is an open drain output. For correct operation, a pull-up resistor of 10kW should be connected between this output and VCC. Manual Reset The PBRST pin makes it possible to manually reset the system by either directly connecting a mechanical pushbutton between the PBRST pin and GND or connecting to a logic low output. Internal de-bounce circuitry is provided to reduce the effect of noise glitches at the input. The signal should remain low for a minimum of 20ms for correct operation. Once the PBRST signal is released (or goes to a logic high), RESET (RESET) remains asserted for a minimum of 250ms. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202245A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 8, 2012 5 DATA SHEET AAT3532 MicroPowerTM Microprocessor Reset Circuit +5V +4.75V (5% Trip Point) VCC +4.50V (10% Trip Point) 0V RESET Output Delay (VCC Rising) RESET Output Delay (VCC Falling) tRPU tRPD RST RST Figure 1: Reset Output Delay. t PB t PBD PBRST t RST RESET RESET Figure 2: Push-Button Reset. 6 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202245A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 8, 2012 DATA SHEET AAT3532 MicroPowerTM Microprocessor Reset Circuit Watchdog Timer The watchdog timer monitors the microprocessor to ensure that the system is functioning correctly. The ST pin of the AAT3532 can be derived from the microprocessor data signals, address signals, and/or I/O signals. The watchdog timer function forces the RST and RST signals into the active state when the ST input is not toggled by a pre-determined time. This time period is set by the logic state of the TD pin, as shown in Table 1. The timer starts once the RST signals become inactive. If the watchdog timer does not receive a high-to-low transition within the specified timeout period, then the RST signals are activated for a minimum 250ms. In normal operation, the timer should receive a transition from the microprocessor within the timeout period, in which case the timer is reset and normal operation continues. The AAT3532 will accept and recognize ST pulses down to a minimum of 20ns wide. t ST ST t TD Figure 3: Watchdog Input. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202245A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 8, 2012 7 DATA SHEET AAT3532 MicroPowerTM Microprocessor Reset Circuit Ordering Information Package Marking Part Number (Tape and Reel)1 SOP-8 3532 AAT3532IAS-T1 Skyworks Green™ products are compliant with all applicable legislation and are halogen-free. For additional information, refer to Skyworks Definition of Green™, document number SQ04-0074. Package Information 6.00 ± 0.20 3.90 ± 0.10 SOP-8 4.90 ± 0.10 0.42 ± 0.09 × 8 1.27 BSC 45° 4° ± 4° 0.175 ± 0.075 1.55 ± 0.20 0.375 ± 0.125 0.235 ± 0.045 0.825 ± 0.445 All dimensions in millimeters. 1. Sample stock is generally held on all part numbers listed in BOLD. Copyright © 2012 Skyworks Solutions, Inc. All Rights Reserved. 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Additional information, including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference. 8 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202245A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 8, 2012