EVALUATION KIT AVAILABLE Click here for production status of specific part numbers. 2 MAX7360 I C-Interfaced Key-Switch Controller and LED Driver/GPIOs with Integrated ESD Protection General Description Features 2 The MAX7360 I C-interfaced peripheral provides Integrated ESD Protection microprocessors with management of up to 64 key 8kV IEC 61000-4-2 Contact Discharge switches, with an additional eight LED drivers/GPIOs 15kV IEC 61000-4-2 Air-Gap Discharge that feature constant-current, PWM intensity control, and +14V Tolerant, Open-Drain I/O Ports Capable of rotary switch control options. Constant-Current LED Drive The key-switch drivers interface with metallic or resistive Rotary Switch-Capable Input Pair (PORT6, PORT7) switches with on-resistances up to 5k. Key inputs are 256-Step PWM Individual LED Intensity Control monitored statically, not dynamically, to ensure low- Individual LED Blink Rates and Common LED EMI operation. The MAX7360 features autosleep and Fade In/Out Rates from 256ms to 4096ms autowake modes to further minimize the power consumption FIFO Queues Up to 16 Debounced Key Events of the device. The autosleep feature puts the device in a User-Configurable Key Debounce (9ms to 40ms) low-power state (1A, typ) after a sleep timeout period. Keyscan Uses Static Matrix Monitoring for Low The autowake feature configures the MAX7360 to return EMI Operation to normal operating mode from sleep upon a keypress. +1.62V to +3.6V Operation The key controller debounces and maintains a FIFO of Monitors Up to 64 Keys keypress and release events (including autorepeat, if Key-Switch Interrupt (INTK) on Each Debounced enabled). An interrupt (INTK) output can be configured to Event/FIFO Level, or End of Definable Time Period alert keypresses, as they occur, or at maximum rate. Port Interrupt (INTI) for Input Ports for Special-Key There are eight open-drain I/O ports, which can be used Functions to drive LEDs. The maximum constant-current level for 400kbps, +5.5V Tolerant 2-Wire Serial Interface each open-drain port is 20mA. The intensity of the LED with Selectable Bus Timeout on each open-drain port can be individually adjusted 2 Four I C Address Choices through a 256-step PWM control. An input port pair (PORT6, PORT7) can be configured to accept 2-bit gray code inputs from a rotary switch. In addition, if not used Ordering Information for key-switch control, up to six column pins can be used PART TEMP RANGE PIN-PACKAGE as general-purpose open-drain outputs (GPOs) for LED MAX7360ETL+ -40C to +85C 40 TQFN-EP* drive or logic control. MAX7360EWX+ -40C to +85C 36 WLP The MAX7360 is offered in a 40-pin (5mm x 5mm) thin +Denotes a lead(Pb)-free/RoHS-compliant package. QFN package with an exposed pad, and a small 36-bump *EP = Exposed pad. wafer level package (WLP) for cell phones, pocket PCs, and other portable consumer electronic applications. The Simplified Block Diagram MAX7360 operates over the -40C to +85C extended temperature range. +1.8V +14V ROTARY TO Applications SCL SWITCH C PORT7 SDA Cell Phones PORT6 INTI PDAs INTK MAX7360 Handheld Games PORT0 Portable Consumer Electronics AD0 ROW (8x) Printers COL (8x) Instrumentation 8 x 8 19-4566 Rev 3 7/192 MAX7360 I C-Interfaced Key-Switch Controller and LED Driver/GPIOs with Integrated ESD Protection Absolute Maximum Ratings V to GND ............................................................-0.3V to +4V Storage Temperature Range ............................ -65C to +150C CC COL0COL7, ROW0ROW7 to GND .....................-0.3V to +4V ESD Protection SDA, SCL, AD0, INTI, INTK to GND .......................-0.3V to +6V Human Body Model (R = 1.5k, C = 100pF) D S PORT0PORT7 to GND .......................................-0.3V to +16V All Pins .............................................................................2kV All Other Pins to GND .............................. -0.3V to (V + 0.3V) IEC 61000-4-2 (R = 330, C = 150pF) CC D S DC Current on PORT0PORT7, COL2COL7 ..................25mA Contact Discharge GND Current ......................................................................80mA ROW0ROW7, COL0COL7, PORT0PORT7 to GND ....8kV Continuous Power Dissipation (T = +70C) Air-Gap Discharge A TQFN (derate 22.2mW/NC above +70C) ................1777mW ROW0ROW7, COL0COL7, PORT0PORT7 to GND ...15kV WLP (derate 21.7mW/NC above +70C) ..................1739mW Lead Temperature (TQFN only soldering, 10s) ..............+300C Operating Temperature Range ........................... -40C to +85C Soldering Temperature (reflow) .......................................+260C Junction Temperature ......................................................+150C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. (Note 1) Package Thermal Characteristics TQFN WLP Junction-to-Ambient Thermal Resistance ( ) ..........45C/W Junction-to-Ambient Thermal Resistance ( )WLP .... 46C/W JA JA Junction-to-Case Thermal Resistance ( ) .................2C/W JC Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial. Electrical Characteristics (V = +1.62V to +3.6V, T = -40C to +85C, unless otherwise noted. Typical values are at V = +3.3V, T = +25C.) (Notes 2, 3) CC A CC A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Operating Supply Voltage V 1.62 3.3 3.6 V CC External Supply Voltage V 14 V PORT PORT0PORT7 All key switches open, oscillator running, COL2COL7 configured as key switches, 34 50 V = V Operating Supply Current I PORT CC A CC 34 + N keys pressed 20 x N Sleep-Mode Supply Current I 1.3 3 A SL Key-Switch Source Current I 20 35 A KEY Key-Switch Source Voltage V 0.43 0.5 V KEY Key-Switch Resistance R (Note 4) 5 k KEY Startup Time from Shutdown t 2 2.4 ms START Output Low Voltage V I = 10mA 0.5 V OL SINK COL2COL7 T = +25C, V = +2.61V 125 128 131 Oscillator Frequency A CC f kHz OSC (PWM Clock) T = T to T , V 3.6V 102 164 A MIN MAX CC Oscillator Frequency Variation f T = +25C -7 +14 % OSC A Key-Scan Frequency f Derived from oscillator clock 64 kHz KEY Maxim Integrated 2 www.maximintegrated.com