ltc4310-1 Linear Technology Corporation, ltc4310-1 Datasheet - Page 14

• Manufacturer Part Number: ltc4310-1
• Description: Ltc4310-1/ltc4310-2 Hot-swappable I2c Isolators Features
• Manufacturer: Linear Technology Corporation

LTC4310-1/LTC4310-2
TYPICAL APPLICATIONS
Figure 8 shows the LTC4310-1 providing I
tions between an I
an I
coupling capacitors, C1-C5, are used to bridge the isolation
barrier. This circuit is recommended for ground isolation
voltages less than 100V and is limited by the voltage rating
of C1-C5. Higher voltage ceramic capacitors may be used
to achieve higher isolation voltages. Because the LTC4310
uses a pseudo-differential transmit scheme, capacitor C5
must be connected between ground and –5V to provide a
return path for the transmitted current.
Figure 9 shows the LTC4310-1 in an application circuit
using its zero current shutdown mode. A microprocessor
only activates the left LTC4310-1 when it needs to com-
applicaTions inForMaTion

2
C bus using –5V for its ground reference. Ceramic
C
BUS
Figure 8. Low Voltage I
2
C bus referenced to system ground and
= 100pF
3.3V
R1
5.1k
R2
5.1k
2
C Isolation Between a Ground Referenced Bus and a –5V Referenced Bus
R3
10k
2
C communica-
SDA
SCL
READY
EN
LTC4310-1
V CC
GND
RXN
RXP
TXP
TXN
C1 TO C5 = 47pF , 100V
C6
0.01µF
C1
C3
C5
0.01µF
municate with the isolated I
contains a STOP bit and bus idle detection circuitry, there
is no danger of connecting in the middle of a message
when the microprocessor asynchronously reenables the
LTC4310-1.
Figure 10 shows the LTC4310-1 in a two-wire bus Hot Swap
application. Using a staggered connector, make EN the
shortest length pin to ensure that the transients associated
with hot swapping have settled before the LTC4310-1 can
be enabled. After connection is complete, a master on the
backplane may drive EN high to bring the LTC4310-1 out
of shutdown mode and into normal operation. Due to its
STOP bit and bus idle detection circuitry, the LTC4310-1’s
driver circuitry is not activated until transactions on both
buses are complete.
C2
C4
C7
–5V
RXP
RXN
TXP
TXN
LTC4310-1
V CC
GND
READY
SDA
SCL
EN
R4
10k
R5
10k
431012 F08
2
C bus. Because the LTC4310-1
R6
10k
–5V
C
BUS
= 30pF
431012f