MC13892JVLR2 Freescale, MC13892JVLR2 Datasheet - Page 93

• Manufacturer Part Number: MC13892JVLR2
• Manufacturer: Freescale

Specifications of MC13892JVLR2

• Operating Temperature (max): 85C
• Operating Temperature (min): -30C
• Mounting: Surface Mount
• Package Type: BGA
• Case Length: 12mm
• Screening Level: Commercial
• Lead Free Status / RoHS Status: Compliant

INTERNAL TRICKLE CHARGE CURRENT SOURCE
dead battery. As can be seen under the description of the standalone charging, this source is activated by the charger state
machine, and its current level is selected based on the battery voltage. The source can also be enabled in software controlled
charging mode by setting the TREN bit. This source cannot be used in single path configurations because in that case,
BATTISNS and BP are shorted on the board.
Table 70. Internal Trickle Charger Characteristics
CHARGER DETECTION AND COMPARATORS
monitors the voltage drop between CHRGRAW and BPSNS, and the “CHGCURR” comparator that monitors the current through
the sense resistor connected between CHRGISNS and BPSNS. A charger insertion is detected based on the charger presence
comparator and the “charger valid” comparator both going high. For all but the lowest current setting, a charger removal is
detected based on both the “charger presence” comparator going low and the charger current falling below CHGCURR. In
addition, for the lowest current settings or if not charging, the “charger valid” comparator going low is an additional cause for
charger removal detection. The table below summarizes the charger detection logic.
Table 71. Charger Detection
are “BATTMIN”, which monitors BATT for the safe charging battery voltage, “BATTON”, which monitors BATT for the safe
operating battery voltage, and “BATTCYCL”, which monitors BPSNS for the constant current to constant voltage transition. The
BATTMIN and BATTON comparators have a normal and a long (slow) debounced output. The slow output is used in some places
in the charger flow to provide enough time to the battery protection circuit to reconnect the battery cell.
Analog Integrated Circuit Device Data
Freescale Semiconductor
Table 72. Charger Detectors main characteristics
Notes
68.
Trickle Charge Current Accuracy
Operating Voltage
Extended Operating Range
0000, 0001
Other Settings
An internal current source between BP and BATTISNS provides small currents to the battery in cases of trickle charging a
The charger detection is based on three comparators. The “charger valid” monitors CHRGRAW, the “charger presence” that
In addition to the aforementioned comparators, three more comparators play a role in battery charging. These comparators
BATTMIN Threshold
BATTON Threshold
BATTCYCL Threshold
Charger Presence
Setting ICHRG[3:0]
The effective trickle current may be significantly reduced
Parameter
Parameter
(68)
Charger Valid
Comparator
Table 69. Internal Trickle Charger Control
At BATT
At BATT
At BPSNS relative to VCHRG[2:0]
CHRGRAW-BPSNS
0 < BATT < BATTMIN
BATTMIN < BATT < BATTON
0
1
1
X
X
X
BATT
Condition
Charger Presence
BATTISNS
BP-BATTISNS
BP-BATTISNS
Comparator
Condition
X
X
0
1
0
1
Trickle Charge Current (mA)
CHGCURR Comparator
40
80
Min
2.9
3.3
10
-
Min
0.3
0
1
-
X
X
X
0
X
1
BATTERY INTERFACE AND CONTROL
Typ
98
FUNCTIONAL DEVICE OPERATION
-
-
-
Typ
-
-
-
-
Max
3.1
3.5
50
Charger Detected
-
Max
30
-
-
-
Yes
Yes
Yes
No
No
No
Units
Volts
Volts
Units
mV
%
%
V
V
V
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