DC1540A Linear Technology, DC1540A Datasheet - Page 45

• 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

MFR_VOUT_DISCHARGE_THRESHOLD
This register contains the coefficient that multiplies
VOUT_COMMAND in order to determine the OFF thresh-
old voltage for the associated output. If the output volt-
age has not decayed below MFR_VOUT_DISCHARGE_
THRESHOLD • VOUT_COMMAND prior to the channel
being commanded to enter/re-enter the ON state, bit [7]
in the STATUS_MFR_SPECIFIC register will be set and the
ALERTB pin will be asserted low. In addition, the channel
will not enter the ON state until the output has decayed
below its OFF threshold voltage.
Other channels can be held off if a particular output has
failed to discharge by using the bidirectional FAULTzn pins
(refer to the MFR_FAULTBzn_RESPONSE and MFR_FAULT-
Bzn_PROPAGATE registers).
MFR_VOUT_DISCHARGE_THRESHOLD Data Contents
MFR_FAULT_LOG_STORE
This command allows the user to transfer data from the
RAM buffer to EEPROM.
MFR_FAULT_LOG_RESTORE
This command allows the user to transfer a copy of the
fault-log data from the EEPROM to the RAM buffer. After
a restore the RAM buffer is locked until a successful
Mfr_fault_log read.
operaTion
BIT(S)
b[15:0]
SYMBOL
Mfr_vout_discharge_
threshold
OPERATION
The data uses the linear format:
k = Y • 2
Where N=b[15:11] is a 5-bit two’s
complement integer and Y= b[10:0]
is an 11-bit two’s complement
integer.
Units: Dimensionless, this register
contains a coefficient.
N
MFR_FAULT_LOG_CLEAR
This command initializes the EEPROM block reserved for
fault logging. Any previous fault log stored in EEPROM
will be erased by this operation.
MFR_FAULT_LOG_STATUS
Read only. This register is used to manage fault log
events.
Mfr_fault_log_status_eeprom is set after a MFR_FAULT_
LOG_STORE command or a faulted-off event triggers a
transfer of the fault log from RAM to EEPROM. This bit is
cleared by a MFR_FAULT_LOG_CLEAR command.
Mfr_fault_log_status_ram is set after a MFR_FAULT_
LOG_RESTORE to indicate that the data in the RAM has
been restored from EEPROM and not yet read using a
MFR_FAULT_LOG command. This bit is cleared by a
MFR_FAULT_LOG command.
MFR_FAULT_LOG_STATUS Data Contents
BIT(S) SYMBOL
b[1]
b[0]
Mfr_fault_log_status_ram
Mfr_fault_log_status_eeprom Fault log EEPROM status:
OPERATION
Fault log RAM status:
0: The fault log RAM allows
updates.
1: The fault log RAM is locked
until the next Mfr_fault_log
read.
0: The transfer of the fault log
RAM to the EEPROM is enabled.
1: The transfer of the fault
log RAM to the EEPROM is
inhibited.
LTC2978

2978fa