MAX7314 19-3170 Rev 4 4/05 18-Port GPIO with LED Intensity Control, Interrupt, and Hot-Insertion Protection General Description Features 2 The MAX7314 I C-compatible serial interfaced periph- 400kbps, 2-Wire Serial Interface, 5.5V Tolerant eral provides microprocessors with 16 I/O ports plus one 2V to 3.6V Operation output-only port and one input-only port. Each I/O port Overall 8-Bit PWM LED Intensity Control can be individually configured as either an open-drain Global 16-Step Intensity Control current-sinking output rated at 50mA and 5.5V, or a logic Individual 16-Step Intensity Controls input with transition detection. The output-only port can 2-Phase LED Blinking be assigned as an interrupt output for transition detec- tion. The outputs are capable of driving LEDs, or provid- 50mA Maximum Port Output Current ing logic outputs with external resistive pullup up to 5.5V. Supports Hot Insertion Eight-bit PWM current control is built in for all 17 output Outputs are 5.5V-Rated Open Drain ports. A 4-bit global control applies to all LED outputs Inputs are Overvoltage Protected to 5.5V and provides coarse adjustment of current from fully off Transition Detection with Interrupt Output to fully on with 14 intensity steps in between. Each out- put has an individual 4-bit control, which further divides 1.2A (typ), 3.6A (max) Operating Current the globally set current into 16 more steps. Small 4mm x 4mm, Thin QFN Package Alternatively, the current control can be configured as a -40C to +125C Temperature Range single 8-bit control that sets all outputs at once. Each output has independent blink timing with two blink phases. All LEDs can be individually set to be on or off Ordering Information during either blink phase, or to ignore the blink control. The blink period is controlled by a clock input (up to 1kHz) PIN- PKG PART TEMP RANGE on BLINK or by a register. The BLINK input can also be PACKAGE CODE used as a logic control to turn the LEDs on and off, or as a 24 Thin QFN general-purpose input. MAX7314ATG -40C to +125C 4mm x 4mm T2444-4 x 0.8mm The MAX7314 supports hot insertion. All port pins, the INT output, SDA, SCL, RST, BLINK, and the slave MAX7314AEG -40C to +125C 24 QSOP address input ADO remain high impedance in power- down (V+ = 0V) with up to 6V asserted upon them. Typical Application Circuit The MAX7314 is controlled through a 2-wire serial inter- 2 face, and uses four-level logic to allow four I C 5V addresses from only one select pin. Applications 3.3V LCD Backlights 0.047F LED Status Indication V+ P0 C P1 Relay Drivers SDA SDA P2 MAX7314 SCL SCL P3 Keypad Backlights I/O BLINK P4 I/O RST P5 RGB LED Drivers INT INT/O16 P6 P7 System I/O Ports P8 AD0 P9 INPUT 1 Pin Configurations continued at end of data sheet. P10 INPUT 2 P11 INPUT 3 P12 INPUT 4 P13 INPUT 5 3.3V 5V P14 GND P15 OUTPUT OUTPUT Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLE18-Port GPIO with LED Intensity Control, Interrupt, and Hot-Insertion Protection ABSOLUTE MAXIMUM RATINGS Voltage (with respect to GND) Continuous Power Dissipation (T = +70C) A V+.............................................................................-0.3V to +4V 24-Pin QSOP (derate 9.5mW/C over +70C)..............761mW SCL, SDA, AD0, BLINK, RST, P0P15 .....................-0.3V to +6V 24-Pin QFN (derate 20.8mW/C over +70C) ............1666mW INT/O16 ...................................................................-0.3V to +8V Operating Temperature Range DC Current on P0P15, INT/O16 ........................................55mA (T to T ) .............................................-40C to +125C MIN MAX DC Current on SDA.............................................................10mA Junction Temperature......................................................+150C Maximum GND Current ....................................................350mA Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C 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. ELECTRICAL CHARACTERISTICS (Typical Operating Circuit, V+ = 2V to 3.6V, T = T to T , unless otherwise noted. Typical values are at V+ = 3.3V, T = +25C.) A MIN MAX A (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Operating Supply Voltage V+ 2 3.6 V Output Load External Supply V 0 5.5 V EXT Voltage T = +25C 1.2 2.3 A S C L and S D A at V+ other Standby Current I d i g i tal i nputs at V+ or GN D T = -40C to +85C 2.8 A + A (Interface Idle, PWM Disabled) P WM i ntensity control d i sab l ed T = T to T 3.6 A MIN MAX T = +25C 8.5 15.1 A S C L and S D A at V+ other Supply Current I A + d i g i tal i nputs at V+ or GN D T = -40C to +85C 16.5 A (Interface Idle, PWM Enabled) P WM i ntensity control d i sab l ed T = T to T 17.2 A MIN MAX T = +25C 50 95.3 A Supply Current f = 400kHz other digital SCL (Interface Running, PWM I inputs at V+ or GND PWM T = -40C to +85C 99.2 A + A Disabled) intensity control enabled T = T to T 102.4 A MIN MAX T = +25C 57 110.2 A Supply Current f = 400kHz other digital SCL (Interface Running, PWM I inputs at V+ or GND PWM T = -40C to +85C 117.4 A + A Enabled) intensity control enabled T = T to T 122.1 A MIN MAX Input High Voltage 0.7 x V V IH SDA, SCL, AD0, BLINK, P0P15 V+ Input Low Voltage 0.3 x V V IL SDA, SCL, AD0, BLINK, P0P15 V+ Input Leakage Current I , I 0 input voltage 5.5V -0.2 +0.2 A IH IL SDA, SCL, AD0, BLINK, P0P15 Input Capacitance 8pF SDA, SCL, AD0, BLINK, P0P15 2 MAX7314