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參數(shù)資料
| 型號： | ICL3225ECP |
| 廠商： | Intersil |
| 文件頁數(shù)： | 3/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC 2DRVR/2RCVR RS232 3V 20-DIP |
| 標(biāo)準(zhǔn)包裝： | 18 |
| 類型： | 收發(fā)器 |
| 驅(qū)動器/接收器數(shù)： | 2/2 |
| 規(guī)程： | RS232 |
| 電源電壓： | 3 V ~ 5.5 V |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 20-DIP（0.300"，7.62mm） |
| 供應(yīng)商設(shè)備封裝： | 20-PDIP |
| 包裝： | 管件 |
11
FN4900.9
February 27, 2006
(set), keeping the ICL32XXE powered down until FORCEON
transitions high, or until a transition occurs on a receiver or
transmitter input.
The INVALID output signal switches low to indicate that
invalid levels have persisted on all of the receiver inputs for
more than 30
s (see Figure 8), but this has no direct effect
on the state of the ICL32XXE (see the next sections for
methods of utilizing INVALID to power down the device).
INVALID switches high 1
s after detecting a valid RS-232
level on a receiver input. INVALID operates in all modes
(forced or automatic powerdown, or forced on), so it is also
useful for systems employing manual powerdown circuitry.
The time to recover from automatic powerdown mode is
typically 100
s.
Emulating Standard Automatic Powerdown
If enhanced automatic powerdown isn’t desired, the user can
implement the standard automatic powerdown feature (mimics
the function on the ICL3221E/ICL3223E/ICL3243E) by
connecting the INVALID output to the FORCEON and
FORCEOFF inputs, as shown in Figure 9. After 30
s of invalid
receiver levels, INVALID switches low and drives the
ICL32XXE into a forced powerdown condition. INVALID
switches high as soon as a receiver input senses a valid RS-
232 level, forcing the ICL32XXE to power on. See the “INVALID
DRIVING FORCEON AND FORCEOFF” section of Table 2 for
an operational summary. This operational mode is perfect for
handheld devices that communicate with another computer via
a detachable cable. Detaching the cable allows the internal
receiver pull-down resistors to pull the inputs to GND (an invalid
RS-232 level), causing the 30
s timer to time-out and drive the
IC into powerdown. Reconnecting the cablerestores valid
levels, causing the IC to power back up.
Hybrid Automatic Powerdown Options
For devices which communicate only through a detachable
cable, connecting INVALID to FORCEOFF (with FORCEON
= 0) may be a desirable configuration. While the cable is
attached INVALID and FORCEOFF remain high, so the
enhanced automatic powerdown logic powers down the RS-
232 device whenever there is 30 seconds of inactivity on the
receiver and transmitter inputs. Detaching the cable allows
the receiver inputs to drop to an invalid level (GND), so
INVALID switches low and forces the RS-232 device to
power down. The ICL32XXE remains powered down until
the cable is reconnected (INVALID = FORCEOFF = 1) and a
transition occurs on a receiver or transmitter input (see
Figure 7). For immediate power up when the cable is
reattached, connect FORCEON to FORCEOFF through a
network similar to that shown in Figure 5.
FIGURE 8. CONNECTIONS FOR AUTOMATIC POWERDOWN
WHEN NO VALID RECEIVER SIGNALS ARE
PRESENT
FORCEOFF
INVALID
CPU
I/O
FORCEON
ICL32XXE
UART
RECEIVER
INPUTS
TRANSMITTER
OUTPUTS
INVALID
OUTPUT
V+
VCC
0
V-
tINVL
tINVH
FIGURE 9. ENHANCED AUTOMATIC POWERDOWN, INVALID AND READY TIMING DIAGRAMS
READY
OUTPUT
TRANSMITTER
INPUTS
tWU
tAUTOPWDN
tWU
INVALID
REGION
}
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