LTC2974 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC2974' PDF : 32 Pages View PDF
LTC2945
TYPICAL APPLICATIONS
Power Monitoring in –48V System Using External Linear Regulator to Supply Opto-couplers and SCL/SDA Resistive Pull-Ups
–48V
RTN
VEE
–48V INPUT
LT3010-5
IN
OUT
C3
SHDN SENSE
C2
0.1μF
GND
1μF
VDD
ADR1
INTVCC
C1
LTC2945 SCL
1μF
SDAI
VEE
R4 R3 R1 R2
1k 0.51k 1k 10k
R7
0.5k
VCC
GND
ADIN
ADR0
SDAO
GND
PS9817-2 VEE
5V
VCC
ALERT
SENSE– SENSE+
CONTROL REGISTER A2 = 0
RSNS
0.02Ω
VOUT
GND
PS9817-2
R8 R9
0.51k 1k
5V
R10 R11
1k 10k
VDD
SCL
SDA
μP
INT
GND
2945 TA07
SUPPLY B
4.5V TO 80V
SUPPLY A
4.5V TO 80V
Wide Range Dual Supply Monitor with Single LTC2945
D1
BAT54
RSNS1
0.02Ω
RIN1
RIN2
1k
1k
RSNS
0.02Ω
–INF –INS +IN
C1
0.1μF
V+
VREG
LTC6102
OUT
V–
D2
BAT54
RSHUNT*
C2
0.1μF
SENSE+ SENSE–
VDD
C3
0.1μF
LTC2945
INTVCC
ADR1
SCL
SDAI
RADIN
20k
ADIN
ADR0
GND
SDAO
ALERT
2945 TA08
TO
LOAD
I2C
INTERFACE
CONTROL REG
A2
SUPPLY A
1
VOLTAGE
DATA
SENSE+
CURRENT POWER
DATA DATA
ΔSENSE INTERNALLY GENERATED
SUPPLY B
0
VDD**
ADIN USE EXTERNAL μP TO MULTIPLY VOLTAGE (VDD)
AND CURRENT (ADIN) DATA
* SELECT RSHUNT ACCORDING TO THE EQUATION IN THE “FLEXIBLE POWER SUPPLY TO LTC2945” SECTION.
** VOLTAGE DATA HAS AN OFFSET VALUE DUE TO D1’S DROP, IF DESIRABLE THIS CAN BE COMPENSATED THROUGH SOFTWARE.
2945f
27
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