LTC2945

20

Rev. C

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APPLICATIONS INFORMATION

VIN

48V

1/2 ACPL-064L*

1/2 ACPL-064L*

* CMOS OUTPUT

ISO_SDA

C1

1µF

C2

1µF

R5

2k

VDD

INTVCC

LTC2945-1

SDAO

SDAI

GND

VCC

VCC

GND

GND

BS170

M1

R6

2k

R7

2k

2945 F18

3.3V

GND

SDA

µP

VDD

Figure 17. Opto-Isolation of a 1.5kHz I2C Interface Between LTC2945-1 and Microcontroller (SCL Omitted for Clarity)

Figure 18. Opto-Isolation of I2C Interface with Low Power, High Speed Opto-Couplers (SCL Omitted for Clarity)

LTC2945-1

SDAI

SDAO

GND

3.3V

GND

SDA

µP

1/2 MOCD207M

1/2 MOCD207M

48V

R4

20k

R5

7.5k

R6

0.51k

R7

10k

VDD

2945 F17

Figure 19. Recommended Layout for Kelvin Connection

10

9

6

7

8

4

5

11

3

2

1

12

VIN

RSNS

TO

LOAD

2945 F19