參數(shù)資料
型號(hào): LTC4310IDD-2#PBF
廠商: LINEAR TECHNOLOGY CORP
元件分類: 電源管理
英文描述: POWER SUPPLY SUPPORT CKT, PDSO10
封裝: 3 X 3 MM, LEAD FREE, PLASTIC, MO-229WEED-2, DFN-10
文件頁(yè)數(shù): 6/20頁(yè)
文件大?。?/td> 231K
代理商: LTC4310IDD-2#PBF
LTC4310-1/LTC4310-2
14
431012fa
applicaTions inForMaTion
TYPICAL APPLICATIONS
Figure 8 shows the LTC4310-1 providing I2C communica-
tionsbetweenanI2Cbusreferencedtosystemgroundand
an I2C bus using –5V for its ground reference. Ceramic
couplingcapacitors,C1-C5,areusedtobridgetheisolation
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-
municatewiththeisolatedI2Cbus.BecausetheLTC4310-1
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 8. Low Voltage I2C Isolation Between a Ground Referenced Bus and a –5V Referenced Bus
3.3V
CBUS = 30pF
CBUS = 100pF
R1
5.1k
R2
5.1k
R3
10k
431012 F08
C7
0.01F
C1
–5V
R5
10k
R6
10k
GND
RXP
RXN
TXP
TXN
LTC4310-1
VCC
READY
EN
SDA
SCL
R4
10k
C3
C2
C4
C6
0.01F
GND
TXP
TXN
RXP
RXN
LTC4310-1
VCC
READY
EN
SDA
SCL
C5
C1 TO C5 = 47pF, 100V
Figure 9. The LTC4310-1 in a Zero Current Shutdown Application
5V
R1
3.3k
R2
3.3k
R3
10k
431012 F09
C7
0.01F
–5V
R5
5.1k
R6
5.1k
GND
RXP
RXN
TXP
TXN
LTC4310-1
VCC
READY
EN
SDA
SCL
R4
10k
C6
0.01F
GND
TXP
TXN
RXP
RXN
LTC4310-1
VCC
READY
EN
SDA
SCL
. . .
SLAVE#1
P
SLAVE#N
ON
OFF
C1
C3
C2
C4
C5
C1 TO C5 = 47pF, 100V
CBUS = 150pF
CBUS = 200pF
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