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MAX7314AEG Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX7314AEG Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 25 page General Description The MAX7314 I2C™-compatible serial interfaced periph- eral provides microprocessors with 16 I/O ports plus one output-only port and one input-only port. Each I/O port can be individually configured as either an open-drain current-sinking output rated at 50mA and 5.5V, or a logic input with transition detection. The output-only port can be assigned as an interrupt output for transition detec- tion. The outputs are capable of driving LEDs, or provid- ing logic outputs with external resistive pullup up to 5.5V. Eight-bit PWM current control is built in for all 17 output ports. A 4-bit global control applies to all LED outputs and provides coarse adjustment of current from fully off to fully on with 14 intensity steps in between. Each out- put has an individual 4-bit control, which further divides the globally set current into 16 more steps. Alternatively, the current control can be configured as a 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 during either blink phase, or to ignore the blink control. The blink period is controlled by a clock input (up to 1kHz) on BLINK or by a register. The BLINK input can also be used as a logic control to turn the LEDs on and off, or as a general-purpose input. The MAX7314 supports hot insertion. All port pins, the INT output, SDA, SCL, RST, BLINK, and the slave address input ADO remain high impedance in power- down (V+ = 0V) with up to 6V asserted upon them. The MAX7314 is controlled through a 2-wire serial inter- face, and uses four-level logic to allow four I2C addresses from only one select pin. Applications LCD Backlights LED Status Indication Relay Drivers Keypad Backlights RGB LED Drivers System I/O Ports Features ♦ 400kbps, 2-Wire Serial Interface, 5.5V Tolerant ♦ 2V to 3.6V Operation ♦ Overall 8-Bit PWM LED Intensity Control Global 16-Step Intensity Control Individual 16-Step Intensity Controls ♦ 2-Phase LED Blinking ♦ 50mA Maximum Port Output Current ♦ Supports Hot Insertion ♦ Outputs are 5.5V-Rated Open Drain ♦ Inputs are Overvoltage Protected to 5.5V ♦ Transition Detection with Interrupt Output ♦ 1.2µA (typ), 3.6µA (max) Operating Current ♦ Small 4mm x 4mm, Thin QFN Package ♦ -40°C to +125°C Temperature Range 18-Port GPIO with LED Intensity Control, Interrupt, and Hot-Insertion Protection ________________________________________________________________ Maxim Integrated Products 1 MAX7314 P8 P10 P0 P1 P2 P3 P4 P5 P6 P7 V+ 3.3V µC SDA SDA AD0 3.3V 5V P11 P12 P13 P14 P15 SCL SCL BLINK I/O RST I/O P9 OUTPUT OUTPUT GND 5V INPUT 1 INPUT 2 INPUT 3 INPUT 4 INPUT 5 0.047 µF INT INT/O16 Typical Application Circuit 19-3170; Rev 4; 4/05 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. Ordering Information PART TEMP RANGE PIN- PACKAGE PKG CODE MAX7314ATG -40 °C to +125°C 24 Thin QFN 4mm x 4mm x 0.8mm T2444-4 MAX7314AEG -40 °C to +125°C 24 QSOP — Pin Configurations continued at end of data sheet. I2C is a trademark of Philips Corp. Purchase of I2C components from Maxim Integrated Products, Inc., or one of its sublicensed Associated Companies, conveys a license under the Philips I2C Patent Rights to use these compo- nents in an I2C system, provided that the system conforms to the I2C Standard Specification as defined by Philips. |
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