LTC2974 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC2974' PDF : 32 Pages View PDF
LTC2945
APPLICATIONS INFORMATION
VIN
48V C1
1μF
VDD
INTVCC
LTC2945-1
SDAO
SDAI
GND
C2
1μF
1/2 ACPL-064L*
R5
2k
VCC
3.3V
GND
VCC
GND
1/2 ACPL-064L*
* CMOS OUTPUT
M1
BS170
R6 R7
2k 2k
VDD
ISO_SDA
μP
SDA
GND
2945 F13
Figure 13. Opto-Isolation of a 10kHz I2C Interface Between LTC2945 and Microcontroller (SCL Omitted for Clarity)
GND
RSHUNT
3.3V
INTVCC
SDAI
VDD
LTC2945
C1
1μF
R3 R1
1k 10k
VEE
GND
SENSE–
SDAO
SENSE+
VEE
VOUT
RSNS
0.02Ω
R2
R4
0.51k 10k
VDD
1/2 MOCD207M
μP
SDA
GND
1/2 MOCD207M
2945 F14
Figure 14. Low Speed 10kHz Opto-Isolators Powered from Low-Side Shunt Regulator
VOUT
RSNS
0.02Ω
SENSE+
INTVCC
SENSE–
SDAI
VDD
LTC2945-1
C1
1μF
SDAO
VOUT
R3 R1
1k 10k
GND
RSHUNT
3.3V
R2 R4
1k 10k
VDD
1/2 MOCD207M
μP
SDA
GND
1/2 MOCD207M
2945 F15
Figure 15. Low Speed 10kHz Opto-Isolators Powered from High-Side Shunt Regulator
2945f
18
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