EVALUATION BOARD DATA SHEET EV173 Evaluation Board for the AAT4292 Seven-Channel High-Side I/O Expander Introduction The AAT4292IJS-DB1 EVAL board demonstrates the AAT4292 SmartSwitch™, which has seven P-channel MOSFETs and one single-wire series control interface and is configured for use as a microprocessor I/O expander application, or for cell phone keypad, backlight and fashion lighting control, or multi-channel low power switching applications. 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 AAT4292 features a 500ns slew rate limited turn-on time and is controlled by an AS2Cwire™ (Advanced Simple Serial Control™) interface, which permits ease of control and efficiency. This document describes the evaluation board as illustrated in Figure 1a and 1b, 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 2. The actual board layout is shown in Figure 3 and 4. For additional information, please consult the AAT4292 product datasheet. Figure 1a: AAT4292 Evaluation Board Top View. Figure 1b: AAT4292 Evaluation Board Bottom View. Layout Guidelines The following guidelines should be followed to ensure proper operation of the AAT4292: 1. If the device outputs OUT1 to OUT7 have capacitor load, depending on the load capacitor value, it is recommended that a 1µF to 10µF 0603 or 0805 ceramic capacitor be placed as close as possible between VIN and GND. This helps to provide a low impedence loop to charge the load capacitor during the MOSFET switches' turn on transient and keep the VIN voltage stable. 2. It is recommended to connect a 100kΩ pull-low resistor at the EN/SET pin, to avoid floating this pin. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202291A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 23, 2012 1 EVALUATION BOARD DATA SHEET EV173 Evaluation Board for the AAT4292 Seven-Channel High-Side I/O Expander J1 Input Voltage VCC JP1 DC+ C9 3 2 1 U1 DC1 CON 1 2 TP4 3 TP5 4 TP6 R4 330Ω R5 330Ω C5 0.1μF C4 0 .1 μF LED4 R6 330Ω C6 0.1μF LED5 TP7 R7 330 Ω C7 0 .1μF 5 OUT4 VIN OUT5 OUT 3 OUT6 OUT 2 OUT7 OUT 1 GND EN /SET 10μF 10 8 TP3 7 TP2 6 TP1 R1 330Ω C1 0.1 μF AAT4292 LED6 GND 9 LED1 LED7 R3 R2 330Ω LED2 C2 0 .1μF 330Ω C3 0.1μF LED3 R8 100kΩ GND GND GND U2 OSC1 R13 330Ω R9 1kΩ C8 1μF R10 1kΩ 1 2 3 4 R 11 1kΩ GND SW3 LED8 20MHz JP2 VDD GP5 GP4 GP3 VSS GP0 GP1 GP2 8 7 6 5 GND PIC12F675 SW2 TP8 _GND SW1 GND Figure 2: AAT4292IJS-DB1 Evaluation Board Schematic. 2 Figure 3: AAT4292 Evaluation Board Top Side Layout (not to scale). Figure 4: AAT4292 Evaluation Board Bottom Side Layout (not to scale). Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202291A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 23, 2012 EVALUATION BOARD DATA SHEET EV173 Evaluation Board for the AAT4292 Seven-Channel High-Side I/O Expander Getting Started The AAT4292IJS-DB1 evaluation board is typically mounted on a battery pack. The jumper J1 is inline with the battery supply for connecting/disconnecting the power for U2 (PIC12F675) and/or U1 (AAT4292IJS). There is an additional shunt JP1 to connect/disconnect the power for U1 (AAT4292IJS). The shunt JP2 provides the connection/disconnection from the AS2Cwire signal generator U2 to control U1. The AAT4292 may be operated from an external power source. The shunt JP1 should be removed; the external power may be applied to JP1 Pin 2 (which is connected to U1 VIN Pin 10). The external power source should be set from 1.8V to 5.5V before the AAT4292 is turned on by mounting the shunt on JP2 and sending the pulsed signal from the signal generator U2. There are three buttons (SW1, SW2, and SW3) on the board, which enable and disable the ON and OFF state for the seven output channels. Once a button or combination of buttons is toggled, the corresponding LED for OUT1 to OUT7 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 AAT4292. Detailed operations are listed in Table 1. The AAT4292 outputs can be probed via the test points (TP1 to TP7). Button(s) Pushed SW2 one time, then SW1 SW2 two times, then SW1 SW2 three times, then SW1 SW2 four times, then SW1 SW2 five times, then SW1 SW2 six times, then SW1 SW2 seven times, then SW1 SW3 SW2 + SW3 (simultaneous) SW1 + SW2 + SW3 (simultaneous) Description Toggle OUT1 on/off. Toggle OUT2 on/off. Toggle OUT3 on/off. Toggle OUT4 on/off. Toggle OUT5 on/off. Toggle OUT6 on/off. Toggle OUT7 on/off. Auto cycling. All outputs blink (on and off) five times, and cycling turn on OUT1 to OUT7 five times, then ordinal turn on the output from OUT1 to OUT7 five times. Auto cycling repeats three times. All outputs ON. All outputs OFF (OUT1-OUT7 floating). Table 1: User Interface Functionality. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202291A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 23, 2012 3 EVALUATION BOARD DATA SHEET EV173 Evaluation Board for the AAT4292 Seven-Channel High-Side I/O Expander Component Part Number Description Manufacturer U1 U2 SW1-SW3 OSC1 R1-R7, R13 R9-R11 R8 C1-C7 (optional) C8 C9 LED1-LED7 LED8 TP1-TP8 CON1 J1 JP1, JP2 AAT4292 PIC12F675 Switch CSTLS20M0X54 Chip Resistor Chip Resistor Chip Resistor GRM188R71C104KA01D GRM188R61A105KA61 GRM21BR61C106K RS-0805UW LED Connector Connector Connector Connector Shunt PCB Seven Channel High-Side I/O Expander 8-bit CMOS, Flash-Based μC; 8-Pin SOIC Package Switch Tact, SPST, 5mm Ceramic Resonator, 20MHz, 3 pins SMD, 330Ω, 5%, 150mW, 0603 SMD, 1kΩ, 5%, 150mW, 0603 SMD, 100kΩ, 5%, 150mW, 0603 SMD, Cap Ceramic 0.1μF 0603 X5R 16V 10% SMD, Cap Ceramic 1μF 0603 X5R 10V 10% SMD, Cap Ceramic 10μF 0805 X5R 16V 10% SMD, White LED, 0805 Yellow LED, 0805 Connector for Test Point Header, 2 pins, for DC input Header, 3 pins, pitch 75mil Header, 2 pins, pitch 75mil Shunt for connector AAT4292 Evaluation Board PCB Skyworks Microchip Murata Vishay Vishay Vishay Murata Murata Murata XRX Skyworks Table 2: AAT4292IJS-DB1 EVAL Board Bill of Materials. 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Additional information, including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference. 4 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202291A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 23, 2012