MIC2782 Evaluation Board Dual-Input Push Button Reset IC with Immediate and Delayed Outputs General Description Getting Started The MIC2782 is a two input, two output push button reset IC. It will generate a reset pulse for a factoryprogrammed reset timeout period after both manual reset inputs have been held to a logic-low for the factoryprogrammed 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 2.2µA of supply current at 3.3V. The device features 65kΩ internal 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 × 1.2mm wafer level chip scale package. The MIC2782ELYCS evaluation board comes with the MIC2782ELYCS (tSETUP = 10s, tRESET = 0.5s) installed. Data sheets and support documentation can be found on Micrel’s web site at: www.micrel.com. 1. VDD Supplies Connect a supply to the VDD and GND terminals, paying careful attention to the polarity and the supply range (1.5V ≤VDD ≤5.5V). An ammeter may be placed between the input supply and the VDD terminal to the evaluation board. Ensure that the supply voltage is monitored at the VDD terminal. The ammeter can reduce the voltage supplied to the input supply. 2. Monitor Inputs and Outputs Monitor the inputs (/MR1 and /MR2) and outputs (RESET and ANDOUT) with an oscilloscope. 3. Turn on the Power Turn on the power supply. Observe that /MR1, /MR2, RESET and ANDOUT are pulled up to VDD. 4. Press Push-Buttons Press push-button inputs /MR1 and /MR2 and observe RESET and ANDOUT outputs. As soon as both the push-button inputs are asserted low together, ANDOUT asserts low. Keeping the push-button inputs asserted low for the factory-programmed setup period initiates one reset output pulse for the reset timeout period, as observed on the RESET output pin. Requirements The MIC2782 evaluation board requires only a single power supply that is capable of delivering greater than 1mA at a voltage range of 1.5V to 5.5V. An oscilloscope can be used to view and measure the inputs and outputs. Precautions There is no reverse input protection on this board. While connecting supplies and signals ensure that correct polarities are observed. The maximum operating VDD is rated at 5.5V. Ordering Information Part Number Description MIC2782ELYCS EV MIC2782 Evaluation Board* *Contact factory for availability of other timing evaluation board options. Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com February 21, 2014 Revision 1.1 Micrel, Inc. MIC2782 Evaluation Board Evaluation Board Features See the MIC2782 datasheet for detailed explanations of these functions. Dual Manual Reset Inputs (/MR1, /MR2) The manual reset inputs can be operated manually using the push-buttons provided or by connecting a function generator. Test points J4–J7 are provided on the manual reset inputs for connecting to a function generator and monitoring on an oscilloscope simultaneously. Outputs (RESET and ANDOUT) The RESET and ANDOUT outputs have 100kΩ pull-up resistors to VDD. Test-point J2 is provided for monitoring the RESET signal on an oscilloscope. The ANDOUT output can be monitored directly by an oscilloscope connected to the test-point J3. Figure 1 illustrates the manual reset function for MIC2782ELYCS option. Figure 1. Manual Reset Function for MIC2782ELYCS showing setup period of 10s and reset timeout period of 0.5s February 21, 2014 2 Revision 1.1 Micrel, Inc. MIC2782 Evaluation Board Evaluation Board Schematic VDD 1.5V to 5.5V R2* DNP R1* DNP U1 CBYP 0.1µF J1 R3 100k C1 VDD VDD RESET B2 SW1 J7 J6 A2 /MR1 R4 100k B1 J2 MIC2782 RESET /MR1 /MR2 ANDOUT A1 GND PUSH-BUTTON SWITCH C2 SW2 J3 ANDOUT J5 J4 /MR2 PUSH-BUTTON SWITCH *LEAVE RESISTORS R1 AND R2 UNPOPULATED Bill of Materials Item Part Number C1 GRM188R71C104KA01D R3, R4 CRCW0603100KJNEA R1, R2 DNP U1 MIC2782ELYCS Manufacturer Description Qty. (1) 0.1µF, 16V capacitor, X7R, 0603 1 (2) 100k, 5% resistor, 0603 2 Murata Vishay 0 Micrel, Inc. Dual-Input Push Button Reset IC with Immediate and Delayed Outputs (3) 1 Notes: 1. Murata : www.murata.com. 2. Vishay : www.vishay.com. 3. Micrel, Inc.: www.micrel.com. February 21, 2014 3 Revision 1.1 Micrel, Inc. MIC2782 Evaluation Board PCB Layout Recommendations Top Silkscreen Copper Layer 1 (Top Layer) February 21, 2014 4 Revision 1.1 Micrel, Inc. MIC2782 Evaluation Board PCB Layout Recommendations (Continued) Copper Layer 2 (Bottom Layer) Bottom Silkscreen February 21, 2014 5 Revision 1.1 Micrel, Inc. MIC2782 Evaluation Board 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. February 21, 2014 6 Revision 1.1