AATIAN80 SIGE | Alldatasheet
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 4
Technical content
AAT4296 EVAL: Five Channel Push/Pull I/O Expander with Serial Control Introduction The AAT4296 evaluation board demonstrates the AAT4296 SmartSwitch™ as a microprocessor I/O expander. The AAT4296 operates from 1.8V to 5.5V, making it ideal for 2.5V, 3.3V, or 5V systems, as well as systems powered by lithium-ion/polymer batteries. The AAT4296 is controlled by AnalogicTech’s S 2Cwire™ (Simple Serial Control™) interface, which offers easy control and efficiency. Each switch features a typical turn-on and turn-off time of 280µs. When the AAT4296 output is programmed for the off or logic low state, the output is internally connected to ground. The switch resistance to the low side N-channel is approximately 2 Ω. This document describes the evaluation board and its accompanying user interface. 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, and the actual board layout is given in Figures 2 and 3. For additional information, please consult the AAT4296 product datasheet. Schematic Figure 1: Evaluation Board Schematic. VDD1 GP52 GP43 GP34 GP2 5GP1 6GP0 7VSS 8 PIC12F675 12 34 5
0 SW1
0 SW2
0 SW3
0.1µF 0.1µF 0.1µF 0.1µF 0.1µF 1µF TP TP TP TP TP EV-123.2005.11.1.0 1
An external power supply is needed to power this evaluation board. Connect the power source positive out- put to DC+ and the negative output to DC-. The power supply voltage level can be set to any level between 1.8V to 5.5V. After applying power to the board, ensure that the jumper "J1" is in the ON position. The red LED1 should illuminate, indicating that power has been connected to the board. There is an additional jumper labeled J2, which provides access to the EN/SET signal from the on-board microcontroller. Ensure that it is in the ON position for normal operation. There are three buttons on the board, SW1 to SW3. After a button or a combination of buttons are pressed and released, the on-board microcontroller will write the corresponding data word to program the desired switch state. The evaluation board is supplied with LEDs connected to each output to indicate output switch state. These LEDs may be removed if the AAT4296 is to be used to control an application circuit and the addi- tional current consumption of the indicator LED is not desired. There are additional PCB pads provided for switch output bypass capacitors (C4 to C8). Placement of output bypass capacitors is optional. In addition, R6 to R10 are preset to 330 Ω to act as ballast resistors to limit the forward current through each indicator LED. If the indicator LEDs are removed from the board, R6 through R10 should be replaced with 0Ω jumpers. Please refer to the AAT4296 datasheet applications section for addi- tional information. The switch position truth table "AAT4296 Output Settings" can be found in the device datasheet. Toggling SW1 and SW3 together will activate auto-cycling through the microcontroller. The microcontroller will submit a burst of edges, pause, and submit another burst of edges and so on. It will start by submitting 32 edges and then decrement by one edge per cycle until the final cycle, which will submit 1 edge. All LEDs should blink five times before the auto-cycling sequence. All states reset and all LEDs turn off when all three buttons are pushed and released together. The detailed operations are described in Table 1. The AAT4296 outputs can be probed via the test points near the output capacitors (C4 to C8). EV-123 AAT4296 EVAL: Five Channel Push/Pull I/O Expander with Serial Control 2 EV-123.2005.11.1.0
User Interface Functionality Table 1: User Interface Functionality. Printed Circuit Board Figure 2: AAT4296 Evaluation Board Figure 3: AAT4296 Evaluation Board Top Layer (not to scale). Bottom Layer (not to scale). Button(s) Pushed1 Description SW1 [Push/Release Once] Toggle On/Off of Output Channel 1. SW2 [Push/Release Once] Toggle On/Off of Output Channel 2. SW3 [Push/Release Once] Toggle On/Off of Output Channel 3. SW1 + SW2 [Push/Release Together] Toggle On/Off of Output Channel 4. SW2 + SW3 [Push/Release Together] Toggle On/Off of Output Channel 5. SW1 + SW3 [Push/Release Together] Auto Cycling. All Outputs Blink (On/Off) Five Times and Go into Binary Increment Mode. SW1 + SW2 + SW3 [Push/Release Together] Reset: All Outputs Go Off. EV-123 AAT4296 EVAL: Five Channel Push/Pull I/O Expander with Serial Control EV-123.2005.11.1.0 3 1. The '+' sign indicates that these buttons are all pressed and released together.
AAT4296 EVAL Component Listing Table 2: Component Listing. Component Part Number Description Manufacturer U1 AAT4296IJS Five Channel Push/Pull I/O Expander; AnalogicTechSC70JW-8 Package U2 PIC12F675 8-Bit CMOS, FLASH-Based µC; Microchip8-Bin PDIP Package SW1 - SW3 PTS645TL50 Switch Tact, SPST, 5mm ITT Industries R1 - R3 Chip Resistor 1K Ω, 5%, 1/4W; 1206 Vishay R4 Chip Resistor 100K Ω, 5%, 1/4W; 0805 Vishay R5 Chip Resistor 330 Ω, 5%, 1/4W; 1206 Vishay R6 - R10 Chip Resistor 330 Ω, 5%, 1/4W; 0603 Vishay JP1 Chip Resistor 0 Ω, 5%; 0805 Vishay C1 ECJ-2YB1A105K 1µF, 10V, X5R, 10%; 0805 Panasonic-ECG C4-C8 (optional) GRM188R71C104KA01D 0.1µF, 16V, 10%; 0603 Murata J1, J2 PRPN401PAEN Connecting Header, 2mm Zip Sullins Electronics LED1 CMD15-21SRC/TR8 Red LED; 1206 Chicago Miniature Lamp OUT1 - OUT5 CMD15-21UGC/TR8 Green LED; 1206 Chicago Miniature Lamp EV-123 AAT4296 EVAL: Five Channel Push/Pull I/O Expander with Serial Control 4 EV-123.2005.11.1.0 Advanced Analogic Technologies, Inc. 830 E. Arques Avenue, Sunnyvale, CA 94085 Phone (408) 737-4600 Fax (408) 737-4611 AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech pr oduct. 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 wi thout 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 l iability. AnalogicTech warrants performance of its semiconductor products to the specifications applicable at the time of sale in accorda nce with AnalogicTech’s standard warranty. Testing and other quality control techniques are utilized to the extent AnalogicTech deems necessary to support this warranty. Specific tes ting of all parameters of each device is not necessarily performed.