LM8328 datasheet(13/56 Pages) TI2

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LM8328

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SNLS328A – AUGUST 2011 – REVISED MARCH 2013

Figure 9. Example Keyscan Operation for 2 Key Press Events

and 1 Key Release Event

PWM TIMER

The LM8328 supports a timer module dedicated to smooth LED control techniques (lighting controls).

The PWM timer module consists of three independent timer units of which each can generate a PWM output with

a fixed period and automatically incrementing or decrementing variable duty cycle. The timer units are all clocked

with a slow (32.768 kHz) clock whereas the interface operates with the main system clock.

OVERVIEW OF PWM FEATURES

•

Each PWM can establish fixed — or variable — duty-cycle signal sequences on its output.

•

Each PWM can trigger execution of any pre-programmed task on another PWM channel.

•

The execution of any pre-programmed task is self-sustaining and does not require further interaction from the

host.

•

64-byte script buffer for each PWM for up to 32 consecutive instructions.

•

Direct addressing within script buffer to support multiple PWM tasks in one buffer.

OVERVIEW ON PWM SCRIPT COMMANDS

The commands listed in Table 5 are dedicated to the slow PWM timers.

NOTE

The PWM Script commands are not part of the command set supported by the LM8328

command interpreter. These commands must be transferred from the host with help of the

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LM8328 Datasheet(PDF) 13 Page - Texas Instruments