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参数资料
| 型号： | LTC1535 |
| 厂商： | Linear Technology Corporation |
| 英文描述： | Isolated RS485 Transceiver |
| 中文描述： | 485隔离收发器 |
| 文件页数： | 8/12页 |
| 文件大小： | 226K |
| 代理商： | LTC1535 |
8
LTC1535
Driver Output and Slow Slew Rate Control
The LTC1535 uses a proprietary driver output stage that
allows a common mode voltage range that extends be-
yond the power supplies. Thus, the high impedance state
is maintained over the full RS485 common mode range.
The output stage provides 100mA of short-circuit current
limiting in both the positive and negative directions. Thus,
even under short-circuit conditions, the supply voltage
from the open-loop DC converter will not be pulled too low
to prevent proper communication across the isolation
barrier. The driver output will be disabled in the event of a
thermal shutdown and a fault condition will be indicated
through the RE weak output.
The CMOS level SLO pin selects slow or fast slew rates on
the RS485 driver output. The SLO input has an internal
100k pull-up resistor. When SLO is low, the driver outputs
are slew rate limited to reduce high frequency edges. Left
open or tied high, SLO defaults to fast edges. The part
draws more current during slow slew rate edges.
Monitoring Faults on RE
The RE pin can be used to monitor the following fault
conditions: low supply voltages, thermal shutdown or a
time-out fault when there is no data communication across
the barrier. Open circuit or short-circuit conditions on the
twisted pair do not cause a fault indication. However, the
RS485 receiver defaults to a high output state when the
receiver input is open or short-circuited.
The RE pin has a weak current drive output mode for
indicating fault conditions. This fault state can be polled
using the circuit in Figure 10 where the control to RE is
three-stated and the fault condition read back from the RE
pin. The weak drive has 100
μ
A pull-up current to indicate
a fault and 50
μ
A pull-down current for no fault. This allows
the RE pin to be polled without disabling RE on nonfault
conditions.
Both sides contain a low voltage detect circuit. A voltage
less than 4.2V on the isolated side disables communica-
tion.
Figure 10. Detecting Fault Conditions
RE
RE
POLL
FAULT
RO
DI
DE
GND
LTC1535
FAULT
FAULT INDICATED WHEN RE IS THREE-STATED
V
CC
V
CC
1535 F10
POLL
FAULT
BUFFER
APPLICATIU
W
U
U
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1535CSW | 功能描述:IC LINE TRANSCEIVER 28-SOIC RoHS:否 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:27 系列:- 类型:收发器 驱动器/接收器数:3/3 规程:RS232，RS485 电源电压:4.75 V ~ 5.25 V 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC 包装:管件 |
| LTC1535CSW#PBF | 功能描述:IC TRANSCEIVER RS485 ISO 28SOIC RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 产品培训模块:RS-232 & USB Transceiver 标准包装:2,000 系列:- 类型:收发器 驱动器/接收器数:1/1 规程:RS232 电源电压:3 V ~ 5.5 V 安装类型:表面贴装 封装/外壳:16-SSOP（0.209"，5.30mm 宽） 供应商设备封装:16-SSOP 包装:带卷 (TR) 其它名称:296-19849-2 |
| LTC1535CSW#TR | 功能描述:IC TRANSCEIVER RS485 ISO 28SOIC RoHS:否 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:27 系列:- 类型:收发器 驱动器/接收器数:3/3 规程:RS232，RS485 电源电压:4.75 V ~ 5.25 V 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC 包装:管件 |
| LTC1535CSW#TRPBF | 功能描述:IC TRANSCEIVER RS485 ISO 28SOIC RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:27 系列:- 类型:收发器 驱动器/接收器数:3/3 规程:RS232，RS485 电源电压:4.75 V ~ 5.25 V 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC 包装:管件 |
| LTC1535ISW | 功能描述:IC TXRX ISO RS485 DIFF 28-SOIC RoHS:否 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:27 系列:- 类型:收发器 驱动器/接收器数:3/3 规程:RS232，RS485 电源电压:4.75 V ~ 5.25 V 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC 包装:管件 |
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