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參數(shù)資料
| 型號： | ICL3241EIVZ-T |
| 廠商： | INTERSIL CORP |
| 元件分類： | 通用總線功能 |
| 英文描述： | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| 中文描述： | TRIPLE LINE TRANSCEIVER, PDSO28 |
| 封裝： | ROHS COMPLIANT, PLASTIC, MO-153AE, TSSOP-28 |
| 文件頁數(shù)： | 12/27頁 |
| 文件大?。?/td> | 860K |
| 代理商： | ICL3241EIVZ-T |
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12
FN4910.18
March 8, 2005
The INVALID output always indicates whether or not a valid
RS-232 signal is present at any of the receiver inputs (see
Table 2), giving the user an easy way to determine when the
interface block should power down. In the case of a
disconnected interface cable where all the receiver inputs
are floating (but pulled to GND by the internal receiver pull
down resistors), the INVALID logic detects the invalid levels
and drives the output low. The power management logic
then uses this indicator to power down the interface block.
Reconnecting the cable restores valid levels at the receiver
inputs, INVALID switches high, and the power management
logic wakes up the interface block. INVALID can also be
used to indicate the DTR or RING INDICATOR signal, as
long as the other receiver inputs are floating, or driven to
GND (as in the case of a powered down driver). Connecting
FORCEOFF and FORCEON together disables the
automatic powerdown feature, enabling them to function as
a manual SHUTDOWN input (see Figure 4).
With any of the above control schemes, the time required to
exit powerdown, and resume transmission is only 100μs. A
mouse, or other application, may need more time to wake up
from shutdown. If automatic powerdown is being utilized, the
RS-232 device will reenter powerdown if valid receiver levels
aren’t reestablished within 30μs of the ICL32XXE powering
up. Figure 5 illustrates a circuit that keeps the ICL32XXE
from initiating automatic powerdown for 100ms after
powering up. This gives the slow-to-wake peripheral circuit
time to reestablish valid RS-232 output levels.
Automatic Powerdown
(ICL3221E, ICL3223E, ICL3243E Only)
Even greater power savings is available by using the
devices which feature an
automatic
powerdown function.
When no valid RS-232 voltages (see Figure 6) are sensed
on any receiver input for 30μs, the charge pump and
transmitters powerdown, thereby reducing supply current to
1μA. Invalid receiver levels occur whenever the driving
peripheral’s outputs are shut off (powered down) or when the
RS-232 interface cable is disconnected. The ICL32XXE
powers back up whenever it detects a valid RS-232 voltage
level on any receiver input. This automatic powerdown
FIGURE 2. POWER DRAIN THROUGH POWERED DOWN
PERIPHERAL
OLD
V
CC
POWERED
DOWN
UART
GND
SHDN = GND
V
CC
Rx
Tx
V
CC
CURRENT
FLOW
V
OUT
=
V
CC
RS-232 CHIP
FIGURE 3. DISABLED RECEIVERS PREVENT POWER DRAIN
ICL324XE
TRANSITION
DETECTOR
R
X
T
X
R2
OUTB
R2
OUT
T1
IN
FORCEOFF = GND
OR SHDN = GND, EN = V
CC
V
CC
V
CC
TO
R2
IN
T1
OUT
V
OUT
=
HI-Z
POWERED
DOWN
UART
WAKE-UP
LOGIC
FIGURE 4. CONNECTIONS FOR MANUAL POWERDOWN
WHEN NO VALID RECEIVER SIGNALS ARE
PRESENT
PWR
MGT
LOGIC
FORCEOFF
INVALID
CPU
I/O
FORCEON
ICL3221E,
ICL3223E,
UART
ICL3243E
FIGURE 5. CIRCUIT TO PREVENT AUTO POWERDOWN FOR
100ms AFTER FORCED POWERUP
ICL3221E, ICL3223E, ICL3243E
FORCEOFF
FORCEON
POWER
MANAGEMENT
UNIT
MASTER POWERDOWN LINE
1M
0.1μF
ICL3221E, ICL3222E, ICL3223E, ICL3232E, ICL3241E, ICL3243E
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