參數(shù)資料
型號(hào)： 9863
廠商： Intel Corp.
英文描述： Advanced 10/100 Umnmanaged Repeater
中文描述： 高級(jí)10/100 Umnmanaged直放站
文件頁(yè)數(shù)： 39/56頁(yè)
文件大?。?/td> 719K
代理商： 9863
Advanced 10/100 Unmanaged Repeater
—
LXT9883/9863
Datasheet
Document #: 249115
Revision #: 003
Rev. Date: 08/07/01
39
4.2.9
LED Circuits
4.2.9.1
Direct Drive LEDs
Each Direct Drive LED has a corresponding open-drain pin. The LEDs are connected, via a current
limiting resistor, to a positive voltage rail. The LEDs are turned on when the output pin drives Low.
The open-drain LED pins are 5V tolerant, allowing use of either a 3.3V or 5V rail. A 5V rail eases
LED component selection by allowing more common, high forward voltage LEDs to be used.
Refer to
Figure 13
for a circuit illustration.
4.2.9.2
LED Pins Multiplexed with Configuration Inputs
Some static configuration inputs are multiplexed with LED pins to reduce the LXT98x3 pin count.
These LED pins are configured by current sinking (open- drain output) and sourcing (open-source
output). If the LED pin sinks the LED current, the configuration value is
‘
1
’
. If LED pin sources
the current, the configuration value is a
‘
0
’
. The LXT98x3 detects the configuration value
following reset and then selects the appropriate output drive circuit (open drain or source). If the
LED function of a multiplexed configuration pin is not used, tie the pin to Ground or Vcc via a
100
–
500k
resistor to set the configuration value. Multiple LED configuration pins can be tied off
with a single resistor to set them all to the same value. Refer to
Figure 13
for a circuit illustration.
For configuration values of
‘
1
’
, a 3.3V or a 5V rail can be used to drive the LEDs (to ease LED
selection as with Direct Drive LEDs).
For configuration values of
‘
0
’
, external buffering is used when 5V LED driving is desired. (This
buffering could be as simple as a single transistor.) As an alternative, use the copies of the
multiplexed LED data found on the LED serial interface. 5V LED driving is achieved. Also, if a
5V tolerant serial-to-parallel device is used for the LED serial interface, 5V LED driving is
achieved (see
"Serial LEDs
”
on page 40.
).
Figure 13. LED Circuits - Direct Drive &
Multiplexed Configuration Inputs
Inside
IC
Outside
IC
Direct Drive
R
V
LED
Inside
IC
Outside
IC
Configuration
=
‘
1
’
Inside
IC
Outside
IC
Configuration
=
‘
0
’
R
V
LED
R
V
LED
= 3.3 to 5 Volts +/- 5%
Multiplexed
Multiplexed
V
cc
= 3.3 Volts +/- 5%
Inside
IC
Outside
IC
Configuration
=
‘
0
’
V
cc
Multiplexed
with Transistor Buffer
R
V
LED
100k
Rb
V
cc
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