DC1540A Linear Technology, DC1540A Datasheet - Page 60

• Manufacturer Part Number: DC1540A
• Description: LTC2978 Demoboard (includes DC1360A + DC1361A), Requires DC1613A
• Manufacturer: Linear Technology
• Series: -r

Specifications of DC1540A

• Design Resources: DC1540 Design File
• Main Purpose: Power Management, Power Supply Supervisor/Tracker/Sequencer
• Embedded: No
• Utilized Ic / Part: LTC2978
• Primary Attributes: Voltage Detector & Supervisor
• Secondary Attributes: -
• Kit Application Type: Power Management
• Application Sub Type: Power Supply Controller
• Features: Demonstration System For The LTC2978 Octal I2C / SMBus / PMBus Power Supply Monitor & Controller
• Lead Free Status / Rohs Status: Not applicable / Not applicable

applicaTions inForMaTion
LTC2978
Dongle Connections
Figure 20 illustrates the application schematic for powering
and programming one or more LTC2978’s from the LTC
PMBus controller in the absence of system power. Because
of the controller’s limited current sourcing capability, only
0
Figure 20. LTC Controller Connections for Powering and Communicating with the LTC2978
CONTROLLER
SYSTEM
HEADER
3.3V
LTC
NOTE: LTC CONTROLLER I
ISOLATED 3.3V FROM CONTROLLER CAN BE BACK DRIVEN AND WILL ONLY DRAW < 10µA
ISOLATED 3.3V CURRENT LIMIT = 100mA
ISOLATED 3.3V
SDA
SCL
V
GND
CTL
IN
LTC4412
SENSE
GATE
STAT
TP0101K-SSOT23
2
C CONNECTONS ARE OPTO-ISOLATED
TO/FROM OTHER
OR’d 3.3V
DIODE
IDEAL
LTC2978s
the LTC2978’s and the I
ered from the ORed 3.3V supply. In addition, any device
sharing I
have body diodes between the SDA/SCL pins and its V
node because this will interfere with bus communication
in the absence of system power.
0.1µF
0.1µF
2
C bus connections with the LTC2978 should not
V
V
V
V
SDA
SCL
SHARE_CLK
PWR
DD33
DD33
DD25
PIN CONNECTIONS
WP
OMITTED FOR
CLARITY
LTC2978
GND
2
C pull-up resistors should be pow-
2978 F10
2978fa
DD