LM8322EVALKIT National Semiconductor, LM8322EVALKIT Datasheet - Page 7

• Manufacturer Part Number: LM8322EVALKIT
• Description: BOARD EVALUATION LM8322
• Manufacturer: National Semiconductor

Specifications of LM8322EVALKIT

• Main Purpose: Interface, Special Purpose
• Embedded: No
• Utilized Ic / Part: LM8322
• Primary Attributes: Mobile I/O Companion with Key-Scan, I/O Expansion, PWM, Access.bus Host
• Secondary Attributes: Board has MCU for USB to PC GUI
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

8.0 Application Example
8.1 FEATURES
The application example shown in Figure 1 supports the fol-
lowing features:
•
•
•
•
8 x 9 standard keys.
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.
ACCESS.bus (I
communication with the host.
Hardware IRQ interrupt to host to signal keypad, error, and
status events. By default, this is an open-drain output, so
an external pullup resistor may be required to avoid false
assertion. The host can program this output for push-pull
mode, in which case the pullup might not be required, if
the host can ignore a false assertion before the LM8322
has been programmed.
2
C-compatible) interface for
FIGURE 1. Typical Application
7
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Two LEDs driven by PWM outputs with programmable
ramp-up and ramp-down. PWM_2 (shared with GPIO_15
and CONFIG_2) could be used as an additional PWM
driver port to control a third external LED.
ACCESS.bus address is selected by the CONFIG_1 and
CONFIG_2 inputs. These pins may also be used as GPIO
pins after reset initialization has occurred. If extra GPIO
pins are not needed, CONFIG_1 and CONFIG_2 may be
tied directly to V
Crystal pins XTAL_IN and XTAL_OUT may be used to
connect to an external 32.768 kHz crystal or receive an
external 32.768 kHz clock input for running the PWM
peripheral. By default, the PWM is clocked by an on-chip
clock source.
CC
and GND.
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