Datasheet

LTC2945
27
2945fa
For more information www.linear.com/LTC2945
Power Monitoring in –48V System Using Low Side Sensing (1.5kHz I
2
C Interface)
Typical applicaTions
C1
1µF
CONTROL REGISTER A2 = 0
MOCD207M
MOCD207M
2945 TA05
ADR0
ADR1
SCL
V
DD
INTV
CC
V
EE
SDAI
SDAO
ADIN
ALERT
SENSE
–
GND
SENSE
+
LTC2945
C2
0.1µF
–48V
RTN
V
EE
–48V INPUT
R7
0.51k
R3
1k
R4
1k
V
OUT
R8
0.51k
R9
10k
R10
10k
R11
10k
3.3V
R
SNS
0.02Ω
V
DD
GND
µP
SCL
SDA
INT
R1
20k
R2
20k
V
CC
GND
R
SHUNT
3 × 1.8k IN SERIES
C1
1µF
HCPL-063L
CONTROL REGISTER A0 = 0
V
EE
V
EE
HCPL-063L
2945 TA06
ADR0
ADR1
SCL
V
DD
INTV
CC
SDAI
SDAO
ADIN
ALERT
SENSE
–
GND
SENSE
+
LTC2945
V
CC
GND
–48V
RTN
V
EE
–48V INPUT
R7
0.51k
R3
0.51k
R4
1k
V
OUT
C2
1µF
R8
0.51k
R9
1k
R10
1k
R11
10k
3.3V
3.3V
R
SNS
0.02Ω
V
DD
GND
µP
SCL
SDA
INT
R12
100
Q1
PZTA42
D1
1N4148WS
R1
1k
R2
1k
R5
735k
R6
15k
Power Monitoring in –48V Harsh Environment Using INTV
CC
Shunt Regulator to Tolerate 200V Transients