DATA SHEET AAT4290/4291 I/O Expander Load Switches with Serial Control General Description Features The AAT4290 and AAT4291 SmartSwitchTM products are members of Skyworks' Application Specific Power MOSFET (ASPM™) product family. The AAT4290 and AAT4291 are five and three P-channel MOSFETs, respectively, configured for use as a microprocessor I/O expander. Having independent drain outputs and a common source input, they operate with an input voltage ranging from 1.8V to 5.5V, making them ideal for 2.5V, 3.3V, or 5V systems, as well as systems powered by lithium-ion/polymer batteries. Each switch features a 500ns turn-on time. The switch states are controlled by Skyworks' Simple Serial Control (S2Cwire™) interface which permits ease of control and efficiency of size. The quiescent supply current is very low, typically 4.5μA. In shutdown mode, the supply current is reduced to less than 1μA. • • • • • 1.8V to 5.5V Input Voltage Range 5 or 3 Independent Load Switches S2Cwire Interface 1.1 RDS(ON) Per Switch Low Quiescent Current - 4.5μA Typical - 0.1μA in Shutdown • -40°C to +85°C Temperature Range • 8-Pin SC70JW Package Applications • • • • • The AAT4290 and AAT4291 are offered in a Pb-free, 8-pin SC70JW package specified over the -40°C to +85°C temperature range. Cell Phones I/O Expansion Multiple Low Power Switching Personal Communication Devices Portable Electronic Devices A typical application circuit is shown in Figure 1. The pin configurations are shown in Figure 2. A functional block diagram of the AAT4290/4291 is provided in Figure 3. Typical Application INPUT IN AAT4290 EN/SET EN/SET OUT1 OUT1 OUT2 OUT2 OUT3 OUT3 OUT4 OUT4 OUT5 OUT5 GND CIN 1μF COUT1 0.1μF COUT2 0.1μF COUT3 0.1μF GND COUT4 0.1μF COUT5 0.1μF GND Figure 1. Typical Application Circuit. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202221B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 17, 2013 1 DATA SHEET AAT4290/4291 I/O Expander Load Switches with Serial Control Pin Descriptions Pin # AAT4290 AAT4291 Symbol 1 1 IN 2 3 7 6 OUT2 OUT1 4 4 EN/SET 5 6 7 8 N/A 5 N/A N/A 8 2, 3 GND OUT5 OUT4 OUT3 N/C Function Input power supply is connected to the P-channel MOSFET sources. Connect a 1μF capacitor from IN to GND. P-channel MOSFET drain. P-channel MOSFET drain. Input control pin using S2Cwire serial interface. The device records rising edges of the clock and decodes them into 32 states (8 states for AAT4291) which controls the ON/OFF states of the MOSFETs. See Table 1 and Table 2 for output settings. Ground connection. P-channel MOSFET drain. P-channel MOSFET drain. P-channel MOSFET drain. Not connected. Pin Configuration AAT4290 IN OUT2 OUT1 EN/SET AAT4291 1 8 2 7 3 6 4 5 OUT3 OUT4 OUT5 GND IN N/C N/C EN/SET 1 8 2 7 3 6 4 5 OUT3 OUT2 OUT1 GND Figure 2. AAT4290/4291 Pinout − 8-pin SC70JW (Top View). 2 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202221B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 17, 2013 DATA SHEET AAT4290/4291 I/O Expander Load Switches with Serial Control Absolute Maximum Ratings1 Symbol VIN VOUT VEN/SET IMAX TSTORAGE VESD Description IN to GND OUT to GND EN/SET to GND Maximum Continuous Switch Current Storage Temperature Range ESD Rating - HBM2 Value Units -0.3 to 6.0 -0.3 to VIN + 0.3 -0.3 to 6.0 250 -65 to 150 4000 V V V mA °C V Value Units 225 440 °C/W mW Thermal Characteristics Symbol JA PD Description Thermal Resistance3 Maximum Power Dissipation (TA = 25°C)4 1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions specified is not implied. Only one Absolute Maximum Rating should be applied at any one time. 2. Human body model is a 100pF capacitor discharged through a 1.5k resistor to each pin. 3. Mounted on the board. 4. Derate 4.4mW/°C above 25°C. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202221B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 17, 2013 3 DATA SHEET AAT4290/4291 I/O Expander Load Switches with Serial Control Electrical Characteristics VIN = 5.0V, TA = -40°C to +85°C, unless otherwise noted. Typical values are TA = 25°C. Symbol VIN IQ IQ(OFF) ISD(OFF) VUVLO VUVLO(hys) RDS(ON) Description TO TLAT ISINK Min Operation Voltage Quiescent Current Off Supply Current Off Switch Current Under-Voltage Lockout Under-Voltage Lockout Hysteresis On Resistance TCRDS On Resistance Temperature Coefficient AAT4290-1 and AAT4291-1 Output Turn-On Delay Time TD(ON) TR Turn-On Rise Time TD(OFF) Turn-Off Delay Time EN/SET VEN(L) Enable Threshold Low VEN(H) Enable Threshold High TLO EN/SET Low Time THI Conditions Minimum EN/SET High Time EN/SET Off Timeout EN/SET Latch Timeout EN/SET Input Leakage Typ 1.8 VIN = 5.5V, EN/SET = VIN, IOUT = 0, All Switches ON EN/SET = 0, VIN = 5.5V, VOUT Open EN/SET = 0, VIN = 5.5V, VOUTn = 0 VIN Falling VIN VIN VIN VIN = = = = 1.8V, 3.0V, 4.2V, 5.0V, TA TA TA TA = = = = 4.5 0.1 1.2 250 2.5 1.5 1.2 1.1 2800 25°C 25°C 25°C 25°C VIN = 5V, RLOAD = 500, COUT = 0.1μF VIN = 5V, RLOAD = 500, COUT = 0.1μF VIN = 5V, RLOAD = 500 VIN = 1.8V VIN = 5.5V VEN/SET < 0.4V VIN ≤ 2.5V VIN > 2.5V VEN/SET = 5.5V Max Units 5.5 V 8 μA 1 1 μA μA V mV 3.8 2.2 1.8 1.7 ppm°C 40 270 40 ns ns ns 0.4 1.6 100 2.6 2.6 0.01 500 250 4.0 4.0 1 V V ns ns μs μs μA 1. The AAT4290/91 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured by design, characterization, and correlation with statistical process controls. 4 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202221B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 17, 2013 DATA SHEET AAT4290/4291 I/O Expander Load Switches with Serial Control Typical Characteristics Unless otherwise noted, VIN = 5V, CIN = 1μF, COUTX = 0.1μF, TA = 25°C. Quiescent Current vs. Temperature Quiescent Current vs. Input Voltage 6 5.5 5.5 5 VIN = 5.0V 5 4.5 IQ (μ μA) IQ (μA) 4.5 4 3.5 VIN = 3.3V 3 4 3.5 3 2.5 2.5 2 2 1.5 -40 -20 0 20 40 60 80 100 1.5 2.0 2.5 3.0 Temperature (°°C) VIH and VIL vs. Input Voltage 2.1 RDS(ON) (Ω Ω) VIH and VIL (V) 1 0.9 VIL 0.8 RDS5 1.9 1.7 RDS3 RDS4 0.7 1.5 0.5 1.5 2 2.5 3 3.5 4 4.5 5 2.0 2.5 5.5 RDS(ON) vs. Temperature 1.1 RDS2 1.2 RDS(ON) (W) RDS1 RDS5 RDS4 RDS3 0.8 -20 VIN = 5.0V IO1-5 = 100mA 1.3 0.9 0 20 RDS1 1.1 Temperature (°°C) 60 4.0 4.5 5.0 5.5 80 100 RDS2 RDS5 1.0 RDS4 0.9 RDS3 0.8 40 3.5 RDS(ON) vs. Temperature 1.4 VIN = 5.0V IO1-5 = 50mA 3.0 Input Voltage (V) Input Voltage (V) RDS(ON) (W) RDS2 1.3 0.9 0.6 RDS1 1.5 1.1 0.7 -40 5.5 2.3 1.1 0.7 5.0 IO1-5 = 100mA 2.5 VIH 1.2 1 4.5 2.7 1.3 1.2 4.0 RDS(ON) vs. Input Voltage 1.4 1.3 3.5 Input Voltage (V) 0.7 -40 -20 0 20 40 60 80 100 Temperature (°°C) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202221B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 17, 2013 5 DATA SHEET AAT4290/4291 I/O Expander Load Switches with Serial Control Typical Characteristics Unless otherwise noted, VIN = 5V, CIN = 1μF, COUTX = 0.1μF, TA = 25°C. EN/SET Latch Timeout vs. Temperature EN/SET Off Timeout vs. Temperature 3.4 3.2 Off Timeout, tO (μs) Latch Timeout, tLAT (μs) 3.4 3 2.8 VIN = 3.3V 2.6 VIN = 5.0V 2.4 2.2 3.2 3 VIN = 3.3V 2.8 2.6 VIN = 5.0V 2.4 2.2 -40 -20 0 20 40 60 80 100 -40 Temperature (°°C) -20 0 20 40 60 80 Temperature (°°C) EN/SET Timeout vs. Input Voltage Turn-On Characteristic (VIN = 5V, RL1 = RL2 = 50Ω Ω; CO1 = CO2 = 0.1μF) 4.3 4.1 Timeout (μ μs) 3.9 VO2 (5V/div) 3.7 3.5 3.3 VO1 (5V/div) Off Timeout tO 3.1 2.9 2.7 EN/SET (5V/div) Latch Timeout tLAT 2.5 1.5 2 2.5 3 3.5 4 4.5 5 5.5 Input Voltage (V) Time (2μs/div) Turn-On Characteristic Turn-On Characteristic (VIN = 5V; RL1 = RL2 = 50Ω Ω; CO1 = CO2 = 0.1μF) VO2 (5V/div) VO2 (5V/div) VO1 (5V/div) VO1 (5V/div) EN/SET (5V/div) EN/SET (5V/div) Time (2μs/div) 6 (VIN = 5V; RL1 = RL2 = 50Ω Ω; CO1 = CO2 = 0.1μF) Time (2μs/div) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202221B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 17, 2013 100 DATA SHEET AAT4290/4291 I/O Expander Load Switches with Serial Control Typical Characteristics Unless otherwise noted, VIN = 5V, CIN = 1μF, COUTX = 0.1μF, TA = 25°C. Turn-On Characteristic Turn-Off Characteristic (VIN = 5V; RL1 = RL2 = 50Ω Ω; CO1 = CO2 = 0.1μF) (VIN = 5V; RL1 = RL2 = 50Ω Ω; CO1 = CO2 = 0.1μF) VO2 (5V/div) VO2 (5V/div) VO1 (5V/div) VO1 (5V/div) EN/SET (5V/div) EN/SET (5V/div) Time (2μs/div) Time (2μs/div) Transition of Outputs Turn-On Transient Characteristic (VIN = 5V; RL1 = RL2 = 50Ω Ω; CO1 = CO2 = 0.1μF) (VIN = 5V; RL1 = RL2 = 50Ω) VO2 (100mV/div, AC coupled) VO2 (5V/div) VO1 (5V/div) VO1 (5V/div) EN/SET (5V/div) EN/SET (5V/div) Time (2μs/div) Time (5μ μs/div) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202221B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 17, 2013 7 DATA SHEET AAT4290/4291 I/O Expander Load Switches with Serial Control Functional Block Diagram OUT1 IN OUT2 OUT3 OUT4* OUT5* UVLO Control Logic and Level Shift ROM EN/SET S2Cwire Interface GND *AAT4290 only Figure 3. AAT4290/4291 Functional Block Diagram. Functional Description The AAT4290 consists of five P-channel MOSFET power switches designed for I/O expansion applications. The AAT4291 has all of the features offered in the AAT4290, but integrates three switches instead of five. It operates with input voltages ranging from 1.8V to 5.5V which, along with its extremely low operating current, makes it ideal for battery-powered applications. In cases where the input voltage drops below 1.8V, the AAT4290 MOSFETs are protected from entering the linear region of operation by automatically shutting down. In addition, the TTL-compatible EN/SET pin makes the AAT4290 an ideal level-shifted load switch. An optional slew rate controlling feature eliminates in-rush current when a MOSFET is turned on, allowing the AAT4290 to be implemented with a small input capacitor or no capacitor at all, while maintaining isolation between channels. During slewing, the current ramps linearly until it reaches the level required for the output load condition. The proprietary control method works by careful control and monitoring of the MOSFET gate voltage. When the device is switched ON, the gate voltage is quickly increased to the threshold level of the MOSFET. Once at this level, the current begins to slew as the gate voltage is slowly increased until the MOSFET becomes fully enhanced. Once it has reached this point, the gate is quickly increased to the full input voltage and RDS(ON) is minimized. 8 The ON/OFF state of the five MOSFET switches are controlled by the EN/SET serial data input. An internal control counter is clocked on the rising edge of the EN/SET pin and is decoded into the 32 possible states of the MOSFET (see Table 1). The counter rolls over after 32 clocks and the table repeats. The counter can be clocked at speeds up to 1MHz, but the count value is not latched until clocking has stopped and the EN/SET pin has remained high for approximately 2.6μs. The first rising edge of EN/SET enables the AAT4290 and is counted as the first clock. To change states, additional low going clock pulses may be asserted on the EN/SET pin with the resulting change taking effect after the EN/SET pin has remained in a high state for TLAT. The AAT4290 is disabled after the EN/SET pin has transitioned and remained in a logic low state for TO. With the exception of three channel power switches, the AAT4291 has a similar function to the AAT4290. The ON/ OFF state of the three MOSFET switches are controlled by the EN/SET serial data input. An internal control counter is clocked on the rising edge of the EN/SET pin and is decoded into the eight possible states of the MOSFET (see Table 2). The counter rolls over after eight clocks and the table repeats. Figure 4 shows the timing diagram. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202221B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 17, 2013 DATA SHEET AAT4290/4291 I/O Expander Load Switches with Serial Control Timing Diagram OUTn THI TLO TLAT TD(ON) TR TO TD(OFF) EN/SET Figure 4. Timing Diagram. Clock OUT5 OUT4 OUT3 OUT2 OUT1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 on on on on on on on on on on on on on on on on off off off off off off off off off off off off off off off off on on on on on on on on off off off off off off off off on on on on on on on on off off off off off off off off on on on on off off off off on on on on off off off off on on on on off off off off on on on on off off off off on on off off on on off off on on off off on on off off on on off off on on off off on on off off on on off off on off on off on off on off on off on off on off on off on off on off on off on off on off on off on off on off Table 1: AAT4290 Output Settings. Clock OUT3 OUT2 OUT1 1 2 3 4 5 6 7 8 on on on on off off off off on on off off on on off off on off on off on off on off Applications Information Thermal Considerations The AAT4290 is designed to deliver continuous output load currents. Due to its high level of integration, care must be taken in designing for higher load conditions. If greater loads are required, outputs can be tied together to deliver higher power to a given load. At 25°C ambient, the AAT4290 is capable of dissipating 440mW of power, or 1.14A at 5.0V, for an average current of 228mA per output. At 85°C ambient, the AAT4290 is capable of dissipating 178mW of power, or 0.72A at 5.0V, for an average current of 145mA per output. Output Sequencing If output sequencing is not necessary, then all of the outputs will be switched on simultaneously on the first rising edge of the EN/SET pin. However, if output sequencing is desired, then a series of pulses on the EN/ SET pin will accomplish this. Each time a new group of pulses is asserted on EN/SET, the AAT4290/91 internal control is reset. For example, to sequence the outputs in order from OUT5 to OUT1, five clocks bursts are input on the EN/SET pin. From Table 1, the first burst of 16 clocks turns on OUT5. A following burst of 8 clocks (as the counter resets) will add OUT4, followed by 4 clocks to add OUT3, 2 clocks to add OUT2, and 1 clock to add OUT1. Likewise, the outputs can be turned off in any order by adding more clock bursts. Table 2: AAT4291 Output Settings. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202221B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 17, 2013 9 DATA SHEET AAT4290/4291 I/O Expander Load Switches with Serial Control Applications Circuits VSUPPLY 1.8 to 5.5V AAT4290 IN GPIO 1 EN/SET OUT1 EN 1 OUT2 Function 1 OUT3 System µController OUT4 EN 2 OUT5 GPIO 2 GPIO 2 to GPIO 5 are now free for other uses GPIO 3 GPIO 4 GPIO 5 EN 3 EN 4 EN 5 Function 2 Function 3 Function 4 Function 5 Figure 5: GPIO I/O Expander (condense five GPIO control lines to one). VBATTERY AAT3110IJS-5.0 SC70JW-8: 2x2mm AAT4291IJS SC70JW-8: 2x2mm VIN IN VOUT OUT1 OUT2 10μF C+ 10μF OUT3 RGB LED R 1μF ON/OFF SHDN CGND G B EN/SET GND RR CLOCK RG RB Figure 6: RGB LED Control (eliminate three discrete MOSFET switches). 10 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202221B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 17, 2013 DATA SHEET AAT4290/4291 I/O Expander Load Switches with Serial Control Evaluation Board Description 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 7. AAT4290 Evaluation Board The AAT4290IJS-1-DB3 Evaluation Board is used to test the performance of the AAT4290. This section describes 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 AAT4290 TP TP TP R7 330Ω R6 330Ω Out5 C4 0.1μF C5 0.1μF Out4 R10 R9 330Ω R8 330Ω C6 0.1μF Out3 Out2 C7 0.1μF Out1 C8 0.1μF 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 1 2 3 4 22pF R5 330Ω U2 VDD GP5 GP4 GP3 VSS GP0 GP1 GP2 8 7 6 GND 5 LED1 RED PIC12F675 GND 1 3 5 SW2 1 3 5 SW1 1 3 5 GND Figure 7: AAT4290IJS-1-DB3 Evaluation Board Schematic. 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 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202221B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 17, 2013 11 DATA SHEET AAT4290/4291 I/O Expander Load Switches with Serial Control 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 3. Toggling SW1 and SW3 at once, activates the autocycling state through the Table 1 "AAT4290 Output Settings". 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). The evaluation board layer detail is provided in Figures 8 and 9. Table 4 provides the component list for the AAT4290 evaluation board. Button(s) Pushed Description SW1 SW2 SW3 SW1 + SW2 SW2 + SW3 Toggle on/off of output Channel 1. Toggle on/off of output Channel 2. Toggle on/off of output Channel 3. Toggle on/off of output Channel 4. Toggle on/off of output Channel 5. Auto cycling. All outputs blinks (on and off) five times and enter binary-increment mode. Auto cycling repeats three times. Reset. All outputs turn off. SW1 + SW3 SW1 + SW2 + SW3 Table 3: User Interface Functionality. Figure 8: Top Layer (not to scale). 12 Figure 9: Bottom Layer (not to scale). Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202221B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 17, 2013 DATA SHEET AAT4290/4291 I/O Expander Load Switches with Serial Control Component Part# U1 AAT4290 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 Description Manufacturer 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 0Ω, 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 Skyworks Microchip ITT Industries Vishay Vishay Vishay Vishay Vishay Panasonic-ECG Vishay Murata Sullins Electronics ECS Inc Chicago Miniature Lamp Chicago Miniature Lamp Table 4: AAT4290 Evaluation Board Component Listing. AAT4291 Evaluation Board This section discusses the AAT4291 evaluation board and the application of the AAT4291 as an RGB LED driver. Advanced RGB LED control is realized without having to use multiple discrete MOSFET switches controlled by multiple I/O pins from the system processor. Only one digital I/O pin is needed for complete, independent brightness control of each of the R, G, and B LEDs. Using RGB LEDs to generate various colors presents unique challenges. Among them is a requirement to pulse width modulate (PWM) three independent LED currents to accurately control the brightness for each LED color. The AAT4291 is well suited for this. Using only one GPIO pin from the system processor, a high PWM rate can be achieved with complete brightness control for each LED. A schematic of the complete circuit is shown in Figure 10. Getting Started The evaluation board comes with a battery pack attached. In this configuration, VIN is supplied from three standard “AAA” alkaline batteries. Under new conditions for the batteries, the input voltage is generally 4.7V ~ 4.8V and falls off depending on the degree of discharge and load conditions. If desired, the batteries can be removed and an independent, DC supply can be used. There are five buttons on the board. Their functions are as follows: • SW1: Increments through the eight Output Setting states (Table 2). • SW2: Increments B_LED duty cycle. • SW3: Increments G_LED duty cycle. • SW4: Increments R_LED duty cycle. • SW5: Brings EN/SET low (shuts down the AAT4291 device). Notes: 1. 2. Buttons 1 through 4 will automatically increment if held down. Buttons 2 through 4 are set up so that a user can independently control the corresponding R, G, or B LED brightness. This is done by incrementing the PWM duty cycle through the following states: 0%, 25%, 50%, 75%, 100%, 0%, … The PIC microcontroller toggles the EN/SET line high and low at 500kHz. The rise and fall times of the EN/SET signal are small relative to the period,so THI and TLO are roughly 1μs (see Figure 10). THI and TLO depend on the μC's internal RC oscillator, so the 1μs reference is an approximate figure and subject to the precision of the RC oscillator. Figure 11 shows the typical EN/SET signal. The evaluation board layer detail is provided in Figures 12 through 14. Table 5 provides the component list for the AAT4290 evaluation board. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202221B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 17, 2013 13 DATA SHEET AAT4290/4291 I/O Expander Load Switches with Serial Control U1 1 2 C2 10μF 3 4 VOUT GND GND GND C+ VIN CSHDN 8 7 C3 1μF 6 5 U2 1 AAT3110-4.5 2 R6 VIN VIN 4 100K J1 GND 3 1 8 7 6 5 ATT4291 C1 10μF 2 IN OUT3 NC OUT2 OUT1 NC EN/SET GND R9 60.4 VIN VIN R10 60.4 R11 249 R1 1K R2 1K R3 1K R4 1K R5 1K 1 2 4 VDD GP5 GP4 GP3 PIC12C671 3 2 2 3 4 VSS GP0 GP1 GP2 D2R RED D2G GREEN D2B BLUE 8 7 6 5 D1R RED D1G GREEN D1B BLUE 1 1615 SMD 1 1615 SMD S2 S3 S4 S5 Figure 10: AAT4291IJS-1 Evaluation Board Schematic. Figure 11: Typical EN/SET Signal. 14 R12 249 U3 3 S1 R7 249 C4 10μF 4 C6 0.1μF R8 249 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202221B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 17, 2013 DATA SHEET AAT4290/4291 I/O Expander Load Switches with Serial Control Figure 12: Top Layer Silkscreen (not to scale). Figure 13: Top Layer (not to scale). Figure 14: Bottom Layer (not to scale). Component Part# U1 AAT3110 U2 AAT4291 U3 OP1, OP2 C1, C2, C4 C3 C6 R1 – R5 R6 R7, R12 R8, R11 R9, R10 SW1 – SW5 PIC12C671 CSLRGB1-1505 GRM31CR70J106KA01L ECJ-1VB1A105K ECJ-1VB1C104K Chip Resistor Chip Resistor Chip Resistor Chip Resistor Chip Resistor PTS645TL50 Description μPower regulated 4.5V CP; SC70JW-8 package I/O Expander load switches; SC70JW-8 package 8-bit CMOSμC; 8-pin PDIP package RGB LED, common-cathode; 1505 package 10μF, 6.3V, X7R, 10%; 1206 1μF, 10V, X5R, 10%; 0603 0.1μF, 16V, X7R, 10%; 0603 1K, 5%, 1/8W; 0805 100K, 5%, 1/10W; 0603 249, 1%, 1/10W; 0805 249, 1%, 1/10W; 0805 60.4, 1%, 1/10W; 0805 Switch Tact, SPST, 5mm Manufacturer Skyworks Skyworks Microchip CSENG Murata Panasonic-ECG Panasonic-ECG Vishay Vishay Vishay Vishay Vishay ITT Industries Table 5: AAT4291 Evaluation Board Component Listing. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202221B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 17, 2013 15 DATA SHEET AAT4290/4291 I/O Expander Load Switches with Serial Control Ordering Information Package Marking1 Part Number (Tape and Reel)2 SC70JW-8 SC70JW-8 HSXYY HCXYY AAT4290IJS-1-T1 AAT4291IJS-1-T1 Skyworks Green™ products are compliant with all applicable legislation and are halogen-free. For additional information, refer to Skyworks Definition of Green™, document number SQ04-0074. Package Information SC70JW-8 2.20 ± 0.20 1.75 ± 0.10 0.50 BSC 0.50 BSC 0.50 BSC 0.225 ± 0.075 2.00 ± 0.20 0.100 7° ± 3° 0.45 ± 0.10 4° ± 4° 0.05 ± 0.05 0.15 ± 0.05 1.10 MAX 0.85 ± 0.15 0.048REF 2.10 ± 0.30 All dimensions in millimeters. 1. XYY = assembly and date code. 2. Sample stock is generally held on part numbers listed in BOLD. 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Additional information, including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference. 16 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202221B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 17, 2013