LTC4110EUHF LINER [Linear Technology], LTC4110EUHF Datasheet - Page 23

• Manufacturer Part Number: LTC4110EUHF
• Description: Battery Backup System Manager
• Manufacturer: LINER [Linear Technology]

OPERATION
REGISTER RESET STATE
The SHDN pin will reset all logic registers when taken high,
but only if DCIN is present as determined by DCDIV > V
+ V
state will not be entered, but the LTC4110 will be idle and
not able to enter charge or calibration modes. If SHDN is
switched low then normal operation will resume.
While in register reset state, charge and calibration modes
are inhibited, and all registers including the backup fault bit
register are set to their default states and the internal timer
is reset. The status pin ACPb is active, but GPIO1, GPIO2
#
1
2
3
4
5
6
7
8
9
ACH
Logic Event (T = True, F = False) [Notes]
Or
Or
Or
Or
Or
Or
and DCIN above UVLO. Micropower shutdown
RES_OR = F & DCDIV pin = T & SHDN pin = F & CAL_FLT = F &
CAL_START = T
RES_OR = F & DCDIV pin = T & SHDN pin = F & CAL_FLT = F &
CAL_START = T
[Calibration Automatically Started]
V
V
AlarmWarning() command is sent by Smart Battery over SMBus
with any of the following bits set to True:
OVER_TEMP_ALARM or Reserved ALARM or
TERMINATED_DISCHARGE_ALARM]
CAL_RESET = T
RES_HOT = T & RES_UR = F [See ChargeStatus()]
RES_OR = T [Bat Removed, See ChargeStatus()]
V
I
DCDIV pin = F
SHDN pin = T
V
POR_RESET = T [See ChargeMode()]
BDT
BAT
BAT
OVP
UVD
= T [Output Back Drive Current condition sensed)]
< V
< V
= T [Output Over-Voltage condition sensed)]
= T
CAL
CAL
[Battery has reached Discharge]
[Battery is Discharged]
RESUME
STATE
NO
CALIBRATION
MODE?
7
YES
(CALIBRATION FAULT)
Figure 7. Calibration State Diagram
AC
8
RESET
STATE
ANY
and GPIO3 are reset to their default states. The SMBus is
enabled, however, it is not able to communicate with the
LTC4110. The DCIN to DCOUT PowerPath controller is
functional and the V
MICROPOWER SHUTDOWN STATE
If the SHDN pin remains high when DCIN is removed as
detected by the undervoltage lockout UVLO (see V
micropower shutdown is entered, battery backup mode is
inhibited and all registers are reset. During this condition,
the level of the SHDN pin is ignored and has no effect.
6, 9
Notes and/or Actions (T = True, F = False)
CAL_COMPLETE = F
(Calibration started while in Reset {Idle or Cold Power-Up})
I
(Calibration was initiated while in any mode other than Reset.)
I
I
(Normal Calibration Cycle)
CAL_COMPLETE = T
(Battery is already discharged. Cancel Calibration.)
I
(ALARM_INHIBITED bit is found in ChargeStatus())
I
I
I
CHARGE_INHIBITED = F
CHG
CAL
CAL
CAL
CAL
CAL
CAL
= ON & CAL_ON = T
= Off & CAL_ON = F & CAL_COMPLETE = T
= Off & CAL_ON = F & ALARM_INHIBITED = T
= Off & CAL_ON = F & CAL_COMPLETE = F & CAL_FLT = F
= Off & CAL_ON = F & CAL_FLT = T
= Off & CAL_ON = F & ALARM_INHIBITED = F &
or IPPC = Off & All Timers = Reset & CAL_COMPLETE = F
5 (BATTERY IS DEAD)
(CALIBRATION
COMPLETED)
1
2
DD
4
and V
CALIBRATION
CALIBRATION
REF
RUNNING
START
pin voltages remain.
3
4110 F07
LTC4110
23
UVD
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