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MC33349N Datasheet PDF : 8 Pages
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MC33349
PROTECTION CIRCUIT OPERATING MODE TABLE
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Input Conditions
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ CellStatus
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ CELL CHARGING/DISCHARGING
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Storage or Nominal Operation:
No current or voltage faults
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ CELL CHARGING FAULT/RESET
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Charge Voltage Limit Fault:
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ VPin 5 ≥ Vth(OV) for two consecutive
samples
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Charge Voltage Limit Reset:
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ VPin 5 < (Vth(OV) – VH)
for one sample, or
ÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ VPin 2 > Vth(dschg)
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Charge Current Limit Fault:
Circuit Operation
Battery Pack Status
Both Charge MOSFET Q1 and Discharge MOSFET Q2 are on. The
battery pack is available for charging or discharging.
Charge MOSFET Q1 is latched off and the cell is disconnected from
the charging source. An internal current source pull–up is applied to
divider resistors R1 and R2 creating a hysteresis voltage of VH. The
battery pack is available for discharging. Discharge current limit
protection is disabled.
Charge MOSFET Q1 will turn on when the voltage across the cell falls
sufficiently to overcome hysteresis voltage VH, or when a load is
applied to the battery pack.
Charge MOSFET Q1 is latched off and the cell is disconnected from
Outputs
MOSFET Switches
Charge Discharge
Q1
Q2
On
On
On to Off
On
Off to On
On
On to Off
On
VPin 2 ≤ (VPin 6 + Vth(chg))
the charger. Q1 will remain in the off state as long as VPin 6 exceeds
VPin 2 by ≈ Vth(chg). The battery pack is available for discharging.
Discharge current limit is disabled.
Charge Current Limit Reset:
The Sense Enable circuit will reset and turn on charge MOSFET Q1
Off to On
On
VPin 6 – VPin 2 < Vth(chg)
when VPin 6 no longer exceeds VPin 2 by ≈ Vth(chg). This can be
accomplished by either disconnecting the charger from the battery
pack, or by connecting the battery pack to a load.
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ CELL DISCHARGING FAULT/RESET
Discharge Current Limit Fault:
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ VPin 2 ≥ (VPin 6 + Vth(dschg))
Discharge MOSFET Q2 is latched off and the cell is disconnected from
On
the load. Q2 will remain in the off state as long as VPin 2 exceeds VPin 6
by ≈ Vth(dschg). The battery pack is available for charging. Charge
current limit protection is disabled.
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Discharge Current Limit Reset:
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ VPin 2 – VPin 6 < Vth(dschg)
The Sense Enable circuit will reset and turn on discharge MOSFET Q2
On
when VPin 2 no longer exceeds VPin 5 by ≈ Vth(dschg). This can be
accomplished by either disconnecting the load from the battery pack, or
by connecting the battery pack to the charger.
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Discharge VoltageLimitFault:
Discharge MOSFET Q2 is latched off, the cell is disconnected from the
On
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ VPin 5 ≤ Vth(UV) for one sample
load, and the protection circuit enters a low current sleepmode state.
The battery pack is available for charging. Charge current limit
protection is disabled.
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Discharge VoltageLimitReset:
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ VPin 6 > (VPin 2 + 0.6 V)
The Sense Enable circuit will reset and turn on discharge MOSFET Q2
On
when VPin 6 exceeds VPin 2 by 0.6 V. This can be accomplished by
connecting the battery pack to the charger.
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ TEST MODE – PIN 4/PIN 5 SHORT
On to Off
Off to On
On to Off
Off to On
Continuous Charge Voltage Limit
This condition occurs if Pin 4 and Pin 5 are accidently shorted together
Comparator
or purposely connected for rapid Charge Voltgae Limit Testing.
VPin 4 = VPin 5 = Vcell < Vth(chg) MOSFET Q1 On to Off is not delayed and no hysteresis is required for
On
On
VPin 4 = VPin 5 = Vcell > Vth(chg)
FAULTY CELL
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Discharge Voltage Limit Fault:
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ VPin 5 ≤ 1.5 V
reset.
This condition can happen if the cell is defective (<1.5 V) or if a
momentary discharge current causes the cell voltage to fall below
Vth(UV) before a sample is taken.
Off
On
Off
Off
MOTOROLA ANALOG IC DEVICE DATA
5
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