Datasheet

LTC2945
20
2945fa
For more information www.linear.com/LTC2945
applicaTions inForMaTion
V
IN
48V
1/2 ACPL-064L*
1/2 ACPL-064L*
* CMOS OUTPUT
ISO_SDA
C
1
1µF
C2
1µF
R5
2k
V
DD
INTV
CC
LTC2945-1
SDAO
SDAI
GND
V
CC
V
CC
GND
GND
BS170
M1
R6
2k
R7
2k
2945 F17
3.3V
GND
SDA
µP
V
DD
Figure 16. Opto-Isolation of a 1.5kHz I
2
C Interface Between LTC2945-1 and Microcontroller (SCL Omitted for Clarity)
Figure 17. Opto-Isolation of I
2
C 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
V
DD
2945 F16
Figure 18. Recommended Layout for Kelvin Connection
10
9
6 7
8
4
5
11
3
2
1
12
V
IN
R
SNS
TO
LOAD
SENSE
+
SENSE
–
2945 F18