Figure 8 shows the LTC4310-1 providing I
參數(shù)資料
型號(hào): LTC4310IMS-1#TRPBF
廠商: Linear Technology
文件頁數(shù): 6/20頁
文件大?。?/td> 0K
描述: IC I2C ISOLATR 100KHZ BUS 10MSOP
產(chǎn)品培訓(xùn)模塊: LTC4310 - Hot-Swappable I²C Isolators
標(biāo)準(zhǔn)包裝: 2,500
類型: 熱交換 I²C 隔離器
Tx/Rx類型: I²C Logic
電容 - 輸入: 10pF
電源電壓: 3 V ~ 5.5 V
電流 - 電源: 6.5mA
安裝類型: 表面貼裝
封裝/外殼: 10-TFSOP,10-MSOP(0.118",3.00mm 寬)
供應(yīng)商設(shè)備封裝: 10-MSOP
包裝: 帶卷 (TR)
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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