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

[Old version datasheet] Texas Instruments acquired National semiconductor.
номер детали LM8322
подробное описание детали  Mobile I/O Companion Supporting Key-Scan, I/O Expansion, PWM, and ACCESS.bus Host Interface
PDF  42 Pages
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производитель  NSC [National Semiconductor (TI)]
домашняя страница  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM8322 датащи(HTML) 17 Page - National Semiconductor (TI)

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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
17
www.national.com



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