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参数资料
| 型号： | MAX3218EAP+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/12页 |
| 文件大小： | 0K |
| 描述： | IC TXRS RS-232 W/SHTDWN 20SSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,000 |
| 类型： | 线路收发器 |
| 驱动器/接收器数： | 2/2 |
| 规程： | RS232 |
| 电源电压： | 1.8 V ~ 4.25 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) |
MAX3218
MAX3218 shuts down after sensing invalid RS-232 levels
for greater than 30 s, ensuring that the AutoShutdown
mode is not enabled for slow-moving signals (>1V/s).
Another system with AutoShutdown may need a period
of time to wake up. Figure 5 shows a circuit that forces
the transmitters on for 100ms after start-up, allowing
enough time for the other system to realize that the
MAX3218 system is awake. If the other system outputs
valid RS-232 signals within that time, the RS-232 ports on
both systems remain enabled.
__________Applications Information
Operation from Regulated/Unregulated
Dual System Power Supplies
The MAX3218 is intended for use with three different
power-supply sources: it can be powered directly from
a battery, from a 3.0V or 3.3V power supply, or simulta-
neously from both. Figure 1 shows the single-supply
configuration. Figure 6 shows the circuit for operation
from both a 3V supply and a raw battery supply—an
ideal configuration where a regulated 3V supply is
being derived from two cells. In this application, the
MAX3218’s logic levels remain appropriate for interface
with 3V logic, yet most of the power for the MAX3218 is
drawn directly from the battery, without suffering the
efficiency losses of the DC-DC converter. This pro -
longs battery life.
Bypass the input supplies with 0.1F at VCC (C4) and at
least 1F at the inductor (C5). Increase C5 to 4.7F if
the power supply has no other bypass capacitor con-
nected to it.
Low-Power Operation
The following suggestions will help you get maximum
life out of your batteries.
Transmit at the highest practical data rate. Although
this raises the supply current while transmission is in
progress, the transmission will be over sooner. If the
MAX3218 is shut down (using FORCEOFF ) as soon as
each transmission ends, this practice will save energy.
Operate your whole system from the raw battery volt-
age rather than suffer the losses of a regulator or DC-
DC converter. If this is not possible, but your system is
powered from two cells and employs a 3V DC-DC con-
verter to generate the main logic supply, use the circuit
of Figure 6. This circuit draws most of the MAX3218’s
power straight from the battery, but still provides logic-
level compatibility with the 3V logic.
1A Supply Current, 1.8V to 4.25V-Powered
RS-232 Transceiver with AutoShutdown
8
_______________________________________________________________________________________
INVALID IS AN INTERNALLY GENERATED SIGNAL
THAT IS USED BY THE AUTOSHUTDOWN LOGIC
AND APPEARS AS AN OUTPUT OF THE DEVICE.
POWER DOWN IS ONLY AN INTERNAL SIGNAL.
IT CONTROLS THE OPERATIONAL STATUS OF
THE TRANSMITTERS AND THE POWER SUPPLIES.
FORCEOFF
0
1
FORCEON
0
1
0
1
INVALID
0
1
0
1
0
1
0
1
POWER DOWN
0
1
POWER DOWN
FORCEOFF
FORCEON
INVALID
+
-
+
-
Rx
R_IN
FORCEON
FORCEOFF
R_OUT
30s
DELAY
+0.3V to +2.8V
-0.3V to -2.8V
Figure 3. AutoShutdown Logic
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| MAX321CPA | 功能描述:模拟开关 IC RoHS:否 制造商:Texas Instruments 开关数量:2 开关配置:SPDT 开启电阻（最大值）:0.1 Ohms 切换电压（最大）: 开启时间（最大值）: 关闭时间（最大值）: 工作电源电压:2.7 V to 4.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:DSBGA-16 |
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