DC1540A Linear Technology, DC1540A Datasheet - Page 24

• 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

LTC2978
operaTion
ON_OFF_CONFIG
The ON_OFF_CONFIG command configures the combina-
tion of CONTROLn pin input and PMBus bus commands
needed to turn the LTC2978 on/off, including the power-on
behavior, as shown in the following table. This command
register responds to the global page command.
ON_OFF_CONFIG Data Contents

BITS(S) SYMBOL
b[7:5] Reserved
b[4]
b[3]
b[2]
b[1]
b[0]
On_off_config_controlled_on
On_off_config_use_pmbus
On_off_config_use_control
Reserved
On_off_config_control_fast_off
OPERATION
Don’t care. Always returns 0.
Control default autonomous power-up operation.
0: Unit powers up regardless of the CONTROLn pin. Unit always powers up with sequencing. To turn unit on
without sequencing, set TON_DELAY = 0.
1: Unit does not power up unless commanded by the CONTROLn pin and/or the OPERATION command on
the serial bus. If On_off_config[3:2] = 00, the unit never powers up.
Controls how the unit responds to commands received via the serial bus.
0: Unit ignores the Operation_control[1:0].
1: Unit responds to Operation_control[1:0]. Depending on On_off_config_use_control, the unit may also
require the CONTROLn pin to be asserted for the unit to start.
Controls how unit responds to the CONTROLn pin.
0: Unit ignores the CONTROLn pin.
1: Unit requires the CONTROLn pin to be asserted to start the unit. Depending on On_off_config_use_
PMBus the OPERATION command may also be required to instruct the device to start.
Not supported. Always returns 1.
CONTROLn pin turn off action when commanding the unit to turn off
0: Use the programmed TOFF_DELAY.
1: Turn off the output and stop transferring energy as quickly as possible. The device does not sink current
in order to decrease the output voltage fall time.
2978fa