MAX7360
I²C-Interfaced Key-Switch Controller and LED Driver/GPIOs with Integrated ESD Protection
Provides 8kV Contact/15kV Air Gap Discharge IEC Standard ESD Protection on All Keys
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Overview
Features and Benefits
- Integrated ESD Protection
- ±8kV IEC 61000-4-2 Contact Discharge
- ±15kV IEC 61000-4-2 Air-Gap Discharge
- +14V Tolerant, Open-Drain I/O Ports Capable of Constant-Current LED Drive
- Rotary Switch-Capable Input Pair (PORT6, PORT7)
- 256-Step PWM Individual LED Intensity Control
- Individual LED Blink Rates and Common LED Fade In/Out Rates from 256ms to 4096ms
- FIFO Queues Up to 16 Debounced Key Events
- User-Configurable Key Debounce (9ms to 40ms)
- Keyscan Uses Static Matrix Monitoring for Low EMI Operation
- +1.62V to +3.6V Operation
- Monitors Up to 64 Keys
- Key-Switch Interrupt (Active-Low INTK) on Each Debounced Event/FIFO Level, or End of Definable Time Period
- Port Interrupt (Active-Low INTI) for Input Ports for Special-Key Functions
- 400kbps, +5.5V Tolerant 2-Wire Serial Interface with Selectable Bus Timeout
- Four I²C Address Choices
Product Details
The MAX7360 I²C-interfaced peripheral provides microprocessors with management of up to 64 key switches, with an additional eight LED drivers/GPIOs that feature constant-current, PWM intensity control, and rotary switch control options.
The key-switch drivers interface with metallic or resistive switches with on-resistances up to 5kΩ. Key inputs are monitored statically, not dynamically, to ensure low-EMI operation. The MAX7360 features autosleep and autowake modes to further minimize the power consumption of the device. The autosleep feature puts the device in a low-power state (1µA typ) after a sleep timeout period. The autowake feature configures the MAX7360 to return to normal operating mode from sleep upon a keypress.
The key controller debounces and maintains a FIFO of keypress and release events (including autorepeat, if enabled). An interrupt (active-low INTK) output can be configured to alert keypresses, as they occur, or at maximum rate.
There are eight open-drain I/O ports, which can be used to drive LEDs. The maximum constant-current level for each open-drain port is 20mA. The intensity of the LED on each open-drain port can be individually adjusted 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 for key-switch control, up to six column pins can be used as general-purpose open-drain outputs (GPOs) for LED drive or logic control.
The MAX7360 is offered in a 40-pin (5mm x 5mm) thin QFN package with an exposed pad, and a small 36-bump wafer level package (WLP) for cell phones, pocket PCs, and other portable consumer electronic applications. The MAX7360 operates over the -40°C to +85°C extended temperature range.
How to Program the MAX7360 Key Switch Controller using the Arduino IDE
Applications
- Cell Phones
- Handheld Games
- Instrumentation
- PDAs
- Portable Consumer Electronics
- Printers
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At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
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