LTC1535 Ver la hoja de datos (PDF) - Linear Technology
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LTC1535 Datasheet PDF : 18 Pages
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LTC1535
PIN FUNCTIONS
POWER SIDE
VCC (Pin 1): 5V Supply. Bypass to GND with 10μF
capacitor.
ST1 (Pin 2): DC Converter Output 1 to DC Transformer.
ST2 (Pin 3): DC Converter Output 2 to DC Transformer.
GND (Pin 4): Ground.
DI (Pin 25): Transmit Data TTL Input to the Isolated Side
RS485 Driver. Do not float.
DE (Pin 26): Transmit Enable TTL Input to the Isolated
Side RS485 Driver. A high level enables the driver. Do
not float.
RE (Pin 27): Receive Data Output Enable TTL Input. A low
level enables the receiver. This pin also provides a fault
output signal. (See Figure 11.)
RO (Pin 28): Receive Data TTL Output.
ISOLATED SIDE
GND2 (Pin 11): Isolated Side Power Ground.
Z (Pin 12): Differential Driver Inverting Output.
Y (Pin 13): Differential Driver Noninverting Output.
VCC2 (Pin 14): 5V to 7.5V Supply from DC Transformer.
Bypass to GND2 with 10μF capacitor.
B (Pin 15): Differential Receiver Inverting Input.
A (Pin 16): Differential Receiver Noninverting Input.
RO2 (Pin 17): Isolated Side Receiver TTL Output. This
output is always enabled and is unaffected by RE.
SLO (Pin 18): Slow Slew Rate Control of RS485 Driver.
A low level forces the driver outputs into slow slew rate
mode.
BLOCK DIAGRAM
POWER SIDE ISOLATED SIDE
1.3
1
+
1.3
1 VCC
28 RO
RE
27
26 DE
25 DI
4 GND
2
ST1
3
ST2
DECODE
420kHz
FAULT
ENCODE
EN
11 14
GND2 VCC2
ENCODE
DECODE
EN
FAULT
12.75k
27.25k
63.5k A
16
R
12.75k
27.25k
63.5k
B
15
RO2
17
Y
13
D
Z
12
SLO
18
100k
VCC2
1535 BD
1535fb
7
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