参数资料
| 型号： | ICL3225CA-T |
| 厂商： | Intersil |
| 文件页数： | 2/18页 |
| 文件大小： | 0K |
| 描述： | IC 2DRVR/2RCVR RS232 3V 20-SSOP |
| 标准包装： | 1,000 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 2/2 |
| 规程： | RS232 |
| 电源电压： | 3 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 20-SSOP |
| 包装： | 带卷 (TR) |
10
FN4878.8
February 27, 2006
Figure 7 illustrates the enhanced powerdown control logic.
Note that once the ICL32XX enters powerdown (manually or
automatically), the 30 second timer remains timed out (set),
keeping the ICL32XX 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 ICL32XX (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 ICL3221/ICL3223/ICL3243) 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
ICL32XX into a forced powerdown condition. INVALID
switches high as soon as a receiver input senses a valid RS-
232 level, forcing the ICL32XX 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
INPUTS
TRANSMITTER
OUTPUTS
INVALID
OUTPUT
V+
VCC
0
V-
tINVL
tINVH
FIGURE 8. ENHANCED AUTOMATIC POWERDOWN, INVALID AND READY TIMING DIAGRAMS
READY
OUTPUT
TRANSMITTER
INPUTS
tWU
tAUTOPWDN
tWU
INVALID
REGION
}
FIGURE 9. CONNECTIONS FOR AUTOMATIC POWERDOWN
WHEN NO VALID RECEIVER SIGNALS ARE
PRESENT
FORCE
OFF
INV
A
LI
D
CPU
I/O
FOR
C
EO
N
ICL32XX
UART
ICL3225, ICL3245
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