EV-112 AAT4290IJS-1-DB3 EVAL I/O Expander Switch with Serial Control Introduction The AAT4290IJS-1-DB3 EVAL board demonstrates the AAT4290 SmartSwitch™, which has five P-channel MOSFETs and is configured for use as a microprocessor I/O expander application. Having independent drain outputs and a common source input, the device operates with an input voltage range of 1.8V to 5.5V, making it ideal for 1.8V, 2.5V, 3.3V, or 5V systems, as well as systems powered by lithium-ion/polymer batteries. The AAT4290 features a 500ns slew rate limited turn-on time and is controlled by an S2Cwire™ (Simple Serial Control™) interface, which permits ease of control and efficiency. This document describes the evaluation board and its accompanying user interface. In addition, a brief Getting Started section is included to help the user begin operating the evaluation board. A schematic of the complete circuit is shown in Figure 1. The actual board layout is shown in Figures 2 and 3. For additional information, please consult the AAT4290 product datasheet. DC- DC+ TP TP J1 U1 1 2 3 4 JP1 1 2 3 IN OU T3 OUT2 OU T4 OUT1 OU T5 EN /SET GN D 8 7 6 5 AAT4290A TP TP TP R7 330Ω R6 330Ω Out5 C4 0.1µF C5 0.1µF Out4 R10 R9 330Ω R8 330Ω Out3 C6 0.1µF Out2 C7 0.1µF C8 0.1µF Out1 Green GND J2 1 2 3 R4 100kΩ GND DC+ C2 C1 1µF 1 22pF C3 GND 0 2 4 0 2 4 0 2 4 SW3 R3 1kΩ R2 1kΩ R1 1kΩ 2 X1 20MHz U2 1 2 3 4 22pF VDD GP5 GP4 GP3 VSS GP0 GP1 GP2 R5 330Ω 8 7 6 GND 5 LED1 RED PIC12F675 1 3 5 GND SW2 1 3 5 SW1 1 3 5 GND Figure 1: AAT4290IJS-1-DB3 Evaluation Board Schematic. EV-112.2005.06.1.0 1 EV-112 AAT4290IJS-1-DB3 EVAL I/O Expander Switch with Serial Control Getting Started The AAT4290IJS-1-DB3 evaluation board is typically mounted on a battery pack. The battery pack holds three AAA size, conventional alkaline batteries. A jumper is inline with the battery supply for connecting/disconnecting power. There is an additional jumper labeled ON SRL OFF, which provides access to EN/SET. Ensure that the jumper is in the ON SRL position for normal operation. To apply power to the board, ensure the jumper is at the ON MCU position. The red LED1 should illuminate indicating that power has been connected. The AAT4290 may be operated from an external power source. The batteries should be removed from the battery pack. External power may be applied to the DC+ and DC- points on the board. The external power source should be set from 1.8V to 5.5V before the AAT4290 is turned on by moving the jumper on J1 to the “ON MCU” position. There are three buttons on the board (SW1, SW2, and SW3) that enable and disable the ON and OFF state for the five output channels. Once a button (or a combination of buttons) is toggled, the corresponding LED for OUT1 to OUT5 will turn ON or OFF accordingly, depending on the previous state. This indicates that the selected state has been submitted through the EN/SET line to the AAT4290. Detailed operations are listed in Table 1. Toggling SW1 and SW3 at once, activates the auto-cycling state through the "AAT4290 Output Settings" table found in the product datasheet. In other words, the microcontroller will submit a burst of edges, pause, and submit another burst of edges and so on. It will start by submitting 31 edges, next submit 30 edges, etc.; next, submit 1 edge and then start over. All LEDs should blink five times before the sequence of autocycling. By toggling all three buttons together, all LEDs should turn off. The AAT4290 outputs can be probed via the test points near the output capacitors (C4 to C8). Button(s) Pushed Description SW1 Toggle on/off of output Channel 1. SW2 Toggle on/off of output Channel 2. SW3 Toggle on/off of output Channel 3. SW1 + SW2 Toggle on/off of output Channel 4. SW2 + SW3 Toggle on/off of output Channel 5. SW1 + SW3 Auto cycling. All outputs blinks (on and off) five times and enter binaryincrement mode. Auto cycling repeats three times. SW1 + SW2 + SW3 Reset. All outputs turn off. Table 1: User Interface Functionality. 2 EV-112.2005.06.1.0 EV-112 AAT4290IJS-1-DB3 EVAL I/O Expander Switch with Serial Control Printed Circuit Board Figure 2: Top Layer (not to scale). Figure 3: Bottom Layer (not to scale). AAT4290IJS-1-DB3 EVAL Component Listing Component Part# Description Manufacturer U1 AAT4290 AnalogicTech U2 PIC12F675 SW1 - SW3 R1 - R3 R4 R5 R6-R10 JP1 C1 C2, C3 C4-C8 (optional) J1, J2 X1 LED1 OUT1-OUT5 PTS645TL50 Chip Resistor Chip Resistor Chip Resistor Chip Resistor Chip Resistor ECJ-2YB1A105K VJ0805A220KXAA GRM188R71C104KA01D PRPN401PAEN X439-ND CMD15-21SRC/TR8 CMD15-21UGC/TR8 I/O Expander Load Switch with Serial Control; SC70JW-8 Package 8-bit CMOS, FLASH-Based µC; 8-Pin PDIP Package Switch Tact, SPST, 5mm 1K, 5%, 1/4W; 1206 100K, 5%, 1/4W; 0805 330K, 5%, 1/4W; 1206 330K, 5%, 1/4W; 0603 0O, 5%; 0805 1µF, 10V, X5R, 10%; 0805 22pF, 50V, NPO, 10%; 0805 0.1µF, 16V, 10%; 0603 Con. Header, 2mm zip Quartz Crystal 20MHz HC-49US Red LED; 1206 Green LED; 1206 Microchip ITT Industries Vishay Vishay Vishay Vishay Vishay Panasonic-ECG Vishay Murata Sullins Electronics ECS Inc Chicago Miniature Lamp Chicago Miniature Lamp Table 2: Component Listing. EV-112.2005.06.1.0 3 EV-112 AAT4290IJS-1-DB3 EVAL I/O Expander Switch with Serial Control AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent licenses, copyrights, mask work rights, or other intellectual property rights are implied. AnalogicTech reserves the right to make changes to their products or specifications or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. AnalogicTech warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with AnalogicTech’s standard warranty. Testing and other quality control techniques are utilized to the extent AnalogicTech deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed. Advanced Analogic Technologies, Inc. 830 E. Arques Avenue, Sunnyvale, CA 94085 Phone (408) 737-4600 Fax (408) 737-4611 4 EV-112.2005.06.1.0