MIC2782 Dual-Input Push Button Reset IC with Immediate and Delayed Outputs General Description Features The MIC2782 is a two input, two output push button reset IC. It will generate a reset pulse for a factory programmed reset timeout period after both manual reset inputs have been held to a logic-low for the factory programmed setup period. The MIC2782 also has an ANDOUT logic output which will activate if both inputs are held low for longer than a debounce time (1.5ms), and deactivate if one or both inputs are released for longer than a debounce time (1.5ms). The RESET and ANDOUT outputs are active-low, open-drain NMOS outputs. The MIC2782 operates over the 1.5V to 5.5V supply voltage range, consuming 2.2A of supply current at 3.3V. The device features 65kinternal pull-up resistors on both of the inputs (/MR1 and /MR2). The device offers factory programmed setup periods of 6s, 8s, 10s, or 12s and reset timeout periods of 0.5s, 1s or 2s. It is available in a space saving, 6-bump, 0.4mm pitch, 0.8mm x 1.2mm Wafer Level Chip Scale Package. Data sheets and support documentation can be found on Micrel’s web site at: www.micrel.com. 1.5V to 5.5V Operating Supply Voltage Range 2.2A Supply Current with /MR1, /MR2 not asserted Factory programmed setup periods of 6s, 8s, 10s or 12s Factory programmed reset timeout periods of 0.5s, 1s or 2s Integrated 65k /MR1 and /MR2 Pull-Up Resistors Supports single push button reset with /MR1 tied to /MR2 RESET asserts after /MR1 and /MR2 are asserted low for a setup period ANDOUT asserts after /MR1 and /MR2 are asserted low for a debounce time (1.5ms) Open-Drain RESET and ANDOUT Outputs 6-bump, 0.4mm pitch, 0.8mm x 1.2mm Wafer Level Chip Scale Package (WLCSP) Applications Smart Phones Tablets eBooks Portable Games Portable Navigation Device ____________________________________________________________________________________________________________________ Typical Application . Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com January 2012 M9999-010912-A Micrel, Inc. MIC2782 Ordering Information Part Number Setup Period Reset Timeout Period (tSETUP) (tRESET) (s) (s) - 6 0.5 6-bump, 0.4mm pitch, 0.8mm x 1.2mm WLCSP - 6 1 6-bump, 0.4mm pitch, 0.8mm x 1.2mm WLCSP Part Marking MIC2782CLYCS(1) MIC2782CMYCS MIC2782CRYCS (1) (1) MIC2782DLYCS MIC2782DMYCS(1) MIC2782DRYCS (1) Package - 6 2 6-bump, 0.4mm pitch, 0.8mm x 1.2mm WLCSP UKU 8 0.5 6-bump, 0.4mm pitch, 0.8mm x 1.2mm WLCSP - 8 1 6-bump, 0.4mm pitch, 0.8mm x 1.2mm WLCSP - 8 2 6-bump, 0.4mm pitch, 0.8mm x 1.2mm WLCSP UKW 10 0.5 6-bump, 0.4mm pitch, 0.8mm x 1.2mm WLCSP MIC2782EMYCS(1) - 10 1 6-bump, 0.4mm pitch, 0.8mm x 1.2mm WLCSP (1) - 10 2 6-bump, 0.4mm pitch, 0.8mm x 1.2mm WLCSP MIC2782ELYCS MIC2782ERYCS MIC2782FLYCS (1) - 12 0.5 6-bump, 0.4mm pitch, 0.8mm x 1.2mm WLCSP MIC2782FMYCS(1) - 12 1 6-bump, 0.4mm pitch, 0.8mm x 1.2mm WLCSP (1) - 12 2 6-bump, 0.4mm pitch, 0.8mm x 1.2mm WLCSP MIC2782FRYCS Notes: 1. Contact Factory for availability. Ordering Guide MIC2782ELYCS TR Setup Period: C – 6 seconds D – 8 seconds E – 10 seconds F – 12 seconds January 2012 TR – Tape and Reel Reset Timeout Period: L – 0.5 seconds M – 1 seconds R – 2 seconds Package: CS – 0.8mm x 1.2mm WLCSP Junction Temperature Y – -40˚C to +85˚C 2 M9999-010912-A Micrel, Inc. MIC2782 Chip Scale Package (CS) Bump Configuration Y = Year Code WW = Week Code TOP VIEW TOP VIEW (BUMP SIDE DOWN) BOTTOM VIEW (BUMP SIDE UP) 6-Bump, 0.4mm pitch, 0.8mm x 1.2mm WLCSP Package Bump Designation Bump Name Pin Function A1 ANDOUT NMOS Open-Drain output, Active-Low. Asserts low 1.5ms after /MR1 and /MR2 are both asserted low. Connect a resistor greater than 5k from the ANDOUT pin to VDD in order to pull up the ANDOUT output voltage when inactive. No ESD diode from ANDOUT to VDD. Please see the Functional Description and Timing Diagram sections for further details of how the ANDOUT output functions. A2 /MR2 Manual Reset Input 2, Active-Low. Internal 65k (typical) Pull-Up Resistor to VDD. Pulling both manual reset inputs low for longer than the setup period causes one RESET output pulse for the reset timeout delay period. B1 RESET B2 /MR1 NMOS Open-Drain output, Active-Low. Asserts low after /MR1 and /MR2 have both asserted low for longer than setup period. Connect a resistor greater than 5k from the RESET pin to VDD in order to pull up the RESET output voltage when inactive. No ESD diode from RESET to VDD. Please see the Functional Description and Timing Diagram sections for further details of how the RESET output functions. Manual Reset Input 1, Active-Low. Internal 65k (typical) Pull-Up Resistor to VDD. Pulling both manual reset inputs low for longer than the setup period causes one RESET output pulse for the reset timeout delay period. C1 VDD Supply Voltage. Bypass to ground with minimum 0.1µF capacitor. C2 GND Supply Ground. January 2012 3 M9999-010912-A Micrel, Inc. MIC2782 Absolute Maximum Ratings (1) Operating Ratings (2) Supply Voltage (VDD)......................................GND to +6.0V Input Voltage (V/MR1, V/MR2)………GND - 0.3V to VDD + 0.3V NMOS Output Voltage (VRESET, VANDOUT)…....GND - 0.3V to +6.0V Lead Temperature (soldering, 10sec.)....................... 260°C Storage Temperature (Ts)..........................-55°C to +150°C ESD Rating (Human Body Model)(3) .............................. 2kV ESD Rating (Machine Model)…………………………...200V Supply Voltage (VDD).................................... +1.5V to +5.5V Input Voltage (V/MR1, V/MR2)…………………...….…0V to VDD NMOS Output Voltage (VRESET, VANDOUT)….……0V to +5.5V Junction Temperature (TJ) .......................... –40°C to +85°C Package Thermal Resistance 6-Bump, 0.4mm Pitch WLCSP (θJA) ................125°C/W Electrical Characteristics (4) For typical values, VDD = 3.3V, /MR1 = /MR2 = Open, TJ = 25°C, bold values indicate –40°C TJ +85°C; unless noted. Parameter Conditions Min. Typ. Max. Units 5.5 V Power Supply Input Supply Voltage (VDD) Supply Current (IDD) 1.5 Reset Output Valid VDD = 3.3V, /MR1 = /MR2 = VDD 2.2 4.0 VDD = 5.0V, /MR1 = /MR2 = VDD 3.2 5.0 VDD = 3.3V, /MR1 = /MR2 = GND 120 µA Reset Time Setup Period (tSETUP) Reset Timeout Period (tRESET) ANDOUT Debounce Time (tDB) Output Low Voltage (VOL) Open-Drain Leakage Current (ILEAKAGE) Ordering Option: C 5.4 6 6.6 Ordering Option: D 7.2 8 8.8 Ordering Option: E 9.0 10 11 Ordering Option: F 10.8 12 13.2 Ordering Option: L 0.4 0.5 0.6 Ordering Option: M 0.9 1 1.1 s Ordering Option: R 1.8 1 2 1.5 2.2 2 ms V/MR1,2 < (VIL – 100mV) VDD = 4.5V, ISINK = 1.6mA 0.3 VDD = 3.3V, ISINK = 1.2mA 0.3 VDD = 1.5V, ISINK = 0.5mA 0.3 RESET, ANDOUT Inactive 300 VRESET, VANDOUT = 5.5V s V nA /MR1, /MR2 Input 1.2 Input High Voltage (VIH) V Input Low Voltage (VIL) Internal Pull-Up Resistance (RPU) 55 For /MR1, /MR2 65 0.4 V 75 kΩ Notes: 1. Exceeding the absolute maximum rating may damage the device. 2. The device is not guaranteed to function outside its operating rating. 3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF. 4. Specification for packaged product only. January 2012 4 M9999-010912-A Micrel, Inc. MIC2782 Typical Characteristics 4.4 SUPPLY CURRENT (µA) VDD = 3.3V /MR1 = NOT ASSERTED /MR2 = NOT ASSERTED 3.0 2.6 2.2 1.8 TA = 25°C /MR1 = NOT ASSERTED /MR2 = NOT ASSERTED 3.6 2.0 1.2 -40 -15 10 35 60 85 1 2 3 4 5 6 -15 SETUP PERIOD (s) SETUP PERIOD (s) 9.8 4 5 10.5 10.0 9.5 9.0 -40 6 85 TA = 25°C MIC2782ELYCS 10.0 40 60 11.0 10.2 100 35 Setup Period vs. Supply Voltage 10.4 160 10 TEMPERATURE (°C) VDD = 3.3V MIC2782ELYCS 220 3 119 -40 10.6 TA = 25°C /MR1 = /MR2 = GND 2 120 Setup Period vs. Temperature 280 1 121 SUPPLY VOLTAGE (V) Supply Current for /MR1 and /MR2 Inputs Low vs. Supply Voltage 0 VDD = 3.3V /MR1 = /MR2 = GND 118 0 TEMPERATURE (°C) SUPPLY CURRENT (µA) 122 2.8 1.4 -15 10 35 60 85 TEMPERATURE (°C) SUPPLY VOLTAGE (V) 0 1 2 3 4 5 6 SUPPLY VOLTAGE (V) Reset Timeout Period vs. Supply Voltage Reset Timeout Period vs. Temperature 0.60 0.60 VDD = 3.3V MIC2782ELYCS RESET TIMEOUT PERIOD (s) RESET TIMEOUT PERIOD (s) Supply Current for /MR1 and /MR2 Inputs Low vs. Temperature SUPPLY CURRENT (µA) 3.4 SUPPLY CURRENT (µA) VDD Supply Current vs. Supply Voltage VDD Supply Current vs. Temperature 0.55 0.50 0.45 0.40 TA = 25°C MIC2782ELYCS 0.55 0.50 0.45 0.40 -40 -15 10 35 TEMPERATURE (°C) January 2012 60 85 0 1 2 3 4 5 6 SUPPLY VOLTAGE (V) 5 M9999-010912-A Micrel, Inc. MIC2782 Timing Diagram 1.5V VDD 1.5V t > tDB t = tDB t = tDB /MR1 /MR2 tRESET tSETUP RESET UNDEFINED STATE FOR VDD < 1.5V UNDEFINED STATE FOR VDD < 1.5V ANDOUT January 2012 6 M9999-010912-A Micrel, Inc. MIC2782 Functional Diagram January 2012 7 M9999-010912-A Micrel, Inc. MIC2782 pulse duration, will not reset the Setup Timer. After the RESET pin has de-asserted high, both the manual reset inputs must be held high for more than a Debounce Time to reset the Setup Timer. ANDOUT Debounce Time is a de-glitch time, typically 1.5ms, that senses the asserting of both manual reset inputs low together. A de-glitch time is needed if the manual reset inputs come from noisy push-button sources. If either manual reset inputs are asserted (or de-asserted) for less than a Debounce Time, the ANDOUT output will not respond. Functional Description Design and Product Advantages The MIC2782 is a dual push-button input reset IC with extended setup delay times. It is used for generating a hard reset for microcontrollers, PMICs or load disconnect switches. The dual manual reset inputs and long setup delay times help protect against accidental system resets. The fixed Reset Timeout period allows for more predictable phone or Tablet operation during hardware resets. It is used in applications such as smart phones, tablets, personal navigation devices, MP3 players and Set-Top Boxes (STB). Dual Manual Reset Inputs (/MR1, /MR2) The /MR1, /MR2 are active-low manual inputs that have integrated 65kΩ pull-up resistors to the VDD power supply. If both inputs are asserted (logic-level low) for a Setup Period (tSETUP), only one reset pulse, of width tRESET, is generated. The behavior of the RESET and ANDOUT outputs is independent of the order in which the /MR1, /MR2 inputs are driven low. The MIC2782 consumes only 2µA when /MR1 and /MR2 manual inputs are de-asserted (logic-level high) together. Current consumption is typically 120µA when both manual inputs are asserted low together and 55µA when only one of the manual inputs is asserted low while the other manual input is de-asserted high. General Functionality As shown in Figure 1, if both /MR1 and /MR2 are asserted low for longer than the Setup Period (tSETUP), the RESET output will be asserted (logic-level low) for a Reset Timeout Period (tRESET). During the Setup Period, if either of the /MR1 or /MR2 inputs are de-asserted high, then the Setup Period timer will be reset. To assert the RESET output low again, both the /MR1 and /MR2 inputs will have to be asserted low together for the full duration of the Setup period. If both /MR1 and /MR2 are asserted low for longer than the Debounce Time (tDB), then the ANDOUT output will be asserted, (logic-level low). ANDOUT will remain asserted low as long as both the /MR1 and /MR2 inputs are asserted low. If either the /MR1 or /MR2 are deasserted for longer that the Debounce Time (tDB), then the ANDOUT output will de-assert high. Outputs (RESET and ANDOUT) The RESET and ANDOUT outputs are simple opendrain N-channel MOSFET structures that require a pullup resistor. For most applications, the pull-up voltage will be the same as the power supply that supplies VDD to the MIC2782. As shown in Figure 2, it is possible to tie this resistor to some other voltage, other than VDD, thus enabling level-shifting of the RESET or ANDOUT outputs. The pull-up voltage must be limited to 5.5V to avoid damaging the MIC2782. The pull-up resistor must be small enough to supply current to the inputs and leakage paths that are driven by the RESET or ANDOUT outputs. A recommended value is 100kΩ. Since the RESET and ANDOUT outputs are open-drain, several reset sources can be wire-ORed, in parallel, to allow resets from multiple sources. Figure 1. Manual Reset Function Keeping both manual reset inputs low for a longer time does not generate additional RESET output pulses. Deasserting either manual reset input during the RESET January 2012 8 M9999-010912-A Micrel, Inc. MIC2782 Figure 2. MIC2782 Used in Multiple Supply System Bypass Capacitor from VDD to GND A 0.1µF input bypass capacitor must be placed from VDD (Pin C1) to GND (Pin C2). January 2012 9 M9999-010912-A Micrel, Inc. MIC2782 Typical Applications VDD = 1.5V to 5.5V 0.1uF 100k VDD LOAD SWITCH or PMIC or µP /RESET RESET /MR1 100k MIC2782 /MR2 /MR LOAD SWITCH or PMIC /RESET or µP ANDOUT GND PUSH-BUTTON SWITCH Figure 3. Single Button application for MIC2782 used for Microcontroller Reset Figure 4. Dual Button application for MIC2782 used for Microcontroller Reset January 2012 10 M9999-010912-A Micrel, Inc. MIC2782 Evaluation Board Schematic VDD 1.5V to 5.5V U1 CBYP 0.1µF R1 100k C1 J1 VDD VDD RESET B2 SW1 J7 J6 A2 /MR1 J2 RESET /MR1 /MR2 ANDOUT GND C2 J5 B1 MIC2782 PUSH-BUTTON SWITCH SW2 R2 100k A1 J3 J4 ANDOUT /MR2 PUSH-BUTTON SWITCH Bill of Materials Item C1 R1, R2 U1 Part Number GRM188R71C104KA01D (2) CRCW0603100KJNEA MIC2782ELYCS (3) (1) Manufacturer Description Qty. Murata 0.1µF, 16V capacitor, X7R, 0603 1 Vishay 100k, 5% resistor, 0603 2 Micrel, Inc. Dual-Input Push Button Reset IC 1 Notes: 1. Murata Tel: www.murata.com. 2. Vishay Tel: www.vishay.com. 3. Micrel, Inc.: www.micrel.com. January 2012 11 M9999-010912-A Micrel, Inc. MIC2782 PCB Layout Recommendations Top Silkscreen January 2012 12 M9999-010912-A Micrel, Inc. MIC2782 PCB Layout Recommendations (Continued) Copper Layer 1 (Top Layer) Copper Layer 2 (Bottom Layer) January 2012 13 M9999-010912-A Micrel, Inc. MIC2782 PCB Layout Recommendations (Continued) Bottom Silkscreen January 2012 14 M9999-010912-A Micrel, Inc. MIC2782 Package Information 6-Bump, 0.4mm Pitch 0.8mm x 1.2mm WLCSP (CS) Package Drawing January 2012 15 M9999-010912-A Micrel, Inc. MIC2782 MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry, specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. © 2012 Micrel, Incorporated. January 2012 16 M9999-010912-A