LM8333

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SNLS246K – SEPTEMBER 2006 – REVISED MAY 2013

Typical Application

Figure 3. Typical Keypad Configuration

FEATURES

The following features are supported:

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8 x 8 Standard Keys.

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8 Special Function Keys (SF keys) with Wake-Up Capability by Forcing a WAKE_INx Pin to Ground. Pressing

a SF Key Overrides any other Key in the Same Row.

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A Total of 72 Keys can be Scanned.

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The Watchdog Timer is Mandatory, so WD_OUT Must be Connected to RESET.

I/O EXPANSION OPTIONS

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One Host-Programmable PWM Output which also may be Used as a General-Purpose Output.

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Four Host-Programmable General-Purpose I/O Pins, GEN_IO_0, GEN_IO_1, GEN_IO_2, and GEN_IO_3.

GEN_IO_0 and GEN_IO_1 can also be Configured for “Slow” Interrupts, in which any Transition will Trigger a

Hardware Interrupt Event to the Host.

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