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參數(shù)資料
| 型號： | MAX1480 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | Digital Temperature Sensor with 2-Wire Interface 8-SOIC -40 to 125 |
| 中文描述： | 完成后，隔離的RS-485/RS-422數(shù)據(jù)接口 |
| 文件頁數(shù)： | 11/21頁 |
| 文件大?。?/td> | 487K |
| 代理商： | MAX1480 |
M
Complete, Isolated RS-485/RS-422
Data Interface
______________________________________________________________________________________
11
Detailed Description
The MAX1480A/MAX1480B/MAX1480C/MAX1490A/
MAX1490B are complete, electrically isolated, RS-485/
RS-422 data-communications interface solutions.
Transceivers, optocouplers, a power driver, and a
transformer in one standard 28-pin DIP package (24-
pin for the MAX1490A/B) provide a complete interface.
Signals and power are internally transported across the
isolation barrier (Figures 1, 2). Power is transferred from
the logic side (nonisolated side) to the isolated side of
the barrier through a center-tapped transformer.
Signals cross the barrier through high-speed optocou-
plers. A single +5V supply on the logic side powers
both sides of the interface. The MAX1480A/B/C offer
half-duplex communications while the MAX1490A/B
feature full-duplex communication. The functional
input/output relationships are shown in Tables 3–6.
The MAX1480B/MAX1480C/MAX1490B feature reduced-
slew-rate drivers that minimize EMI and reduce reflec-
tions caused by improperly terminated cables, allowing
error-free transmission at data rates up to 250kbps. The
MAX1480A/MAX1490A driver slew rate is not limited,
allowing transmission rates up to 2.5Mbps.
The MAX1480B/MAX1480C/MAX1490B shutdown feature
reduces supply current to as low as 0.2μA by using the
SD pin (see
Low-Power Shutdown Mode
section).
Use the FS pin to select between high and low switching
frequencies for the isolated power driver. The driver
switches at the lower frequency 535kHz when FS is low,
and at the higher frequency 725kHz when FS is high. The
FS pin has a weak internal pull-up that switches the
device to the high-frequency mode when FS is left
unconnected. With FS high or open, no-load supply
current is reduced by approximately 4mA, and by up to
8mA when fully loaded. For optimal performance and
minimal supply current, connect FS to V
CC_
or leave
unconnected.
Drivers are short-circuit current limited and are protect-
ed against excessive power dissipation by thermal
shutdown circuitry that puts the driver outputs into a
high-impedance state. The receiver input has a fail-safe
feature that guarantees a logic-high RO (logic-low
RO
)
output if the input is open circuit.
On the MAX1480A/B/C, the driver outputs are enabled
by bringing DE
′
high. Driver-enable times are typically
0.2μs for the MAX1480A, 35μs for the MAX1480B, and
0.5μs for the MAX1480C. Allow time for the devices to be
enabled before sending data (see the Driver Enable
Time vs. Temperature graph in the
Typical Operating
Characteristics
). When enabled, driver outputs function
as line drivers. Driver outputs are high impedance when
DE
′
is low. While outputs are high impedance, they func-
tion as line receivers.
___________________________________________________Pin Description (continued)
Note:
For DE
′
and DI
′
pin descriptions, see
Detailed Block Diagram and Typical Application Circuit
(Figure 1 for MAX1480A/B/C,
Figure 2 for MAX1490A/B).
PIN
MAX1490A/B
MAX1480A/B/C
A
ISO RO DRV
B
23
—
Noninverting Driver Output and Noninverting Receiver Input
Isolated Receiver-Output Drive. Connect to ISO RO LED through a resistor
(Table 1 of Figure 1 for MAX1480A/B/C, Table 2 of Figure 2 for MAX1490A/B).
Inverting Driver Output and Inverting Receiver Input
Isolated Supply Voltage Source
Internal Connections. Leave these pins unconnected.
24
21
25
26
—
22
ISO V
CC1
AC2, AC1
27, 28
23, 24
ISO DI IN
22
—
Isolated Driver Input. Connect to ISO DI DRV for normal operation.
Z
B
A
—
—
—
21
18
19
20
—
Inverting Driver Output
Inverting Receiver Input
Noninverting Receiver Input
Isolated Driver-Enable Input. Connect to ISO DE DRV for normal operation.
ISO DE IN
NAME
FUNCTION
Y
—
17
Noninverting Driver Output
PINS ON THE ISOLATED RS-485/RS-422 SIDE (continued)
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