LM8322 datasheet(17/42 Pages) NSC

부품명	LM8322

상세설명	Mobile I/O Companion Supporting Key-Scan, I/O Expansion, PWM, and ACCESS.bus Host Interface

PDF	42 Pages

Scroll/Zoom	100%

제조업체	NSC [National Semiconductor (TI)]

홈페이지	http://www.national.com

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keyboard matrix. The default GPIO configuration is an input

with the pullup disabled.

13.1 USING THE CONFIG_X PINS FOR GPIO

The CONFIG_1 and CONFIG_2 pins are available for use as

GPIO pins after power-on or reset. However, stable states

must be provided on these pins during power-on or reset to

select the ACCESS.bus (I2C) bus address.

External pullup or pulldown resistors can be used to pull either

CONFIG_x pin low, while retaining the ability to drive it to an-

other state when used as a GPIO pin.

CONFIG_2 has two alternate functions, in addition to GPIO.

It can be configured as a multiplexer output using the

WRITE_CFG command (0x81), in which case it will not be

available as a GPIO pin. It can also be configured as a PWM

output, which also would override its use as a GPIO pin.

13.2 GPIO TIMING

When a WRITE_PORT_STATE command (0x86) is received,

the GPIO outputs do not change to their new states immedi-

ately or simultaneously. The first one changes 54 µs after the

command is acknowledged, and the others change at inter-

vals of 7.3 µs, as shown in Figure 11.

30013611

FIGURE 11. GPIO Port State Change Timing

LM8322 데이터시트(PDF) 17 Page - National Semiconductor (TI)