MC13892VK Freescale Semiconductor, MC13892VK Datasheet - Page 96

• Manufacturer Part Number: MC13892VK
• Description: IC PMU I.MX51/37/35/27 139MAPBGA
• Manufacturer: Freescale Semiconductor

Specifications of MC13892VK

• Applications: Battery Management, Display (LED Drivers), Handheld/Mobile Devices, Power Supply
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: *
• Output Current: 65 mA
• Output Voltage: 1.5 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Supply: -
• Voltage - Supply: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

FUNCTIONAL DEVICE OPERATION
BATTERY INTERFACE AND CONTROL
for internal precharge, external precharge in the case of USB, and BPON for the external precharge, in case of a charger. This
is a fault condition and is flagged to the processor by the CHGFAULTI interrupt, and the CHGFAULTS[1:0] bits are set to 10.
by the charge current dropping below the CHGCURR limit. The charger automatically restarts if the battery voltage is below
BATTCYCL. Software can bypass this cyclic mode of operation by setting the CYCLB bit. Setting the bit does not prevent
interrupts to be generated.
and an interrupt generated. The charge timer can be reset before it expires by setting the self clearing CHGTMRRST bit. After
expiration, the charger needs to be restarted. Proper charge termination and restart is a relatively slow process. Therefore in both
of the previous cases, the charging will rapidly resume, in case of a sudden battery bounce. This is detected by BP dropping
below the BATTON threshold.
software restart can also be initiated by setting the self clearing CHGRESTART bit.
state machine, except when in a fault condition or when at the end of charge. In low power boot mode, the bit is not set until the
ACKLPB bit is set. This also means that the CHGENS bit is not cleared when the power limiter interacts, or when the battery
temperature is out of range. The charge LED At CHRGLED follows the state of the CHGENS bit with the exception that software
can force the LED driver on.
cases of single path, the pin BATTFET must be left floating.
state machine will be re-initiated again when the temperature drops below this threshold.
SOFTWARE CONTROLLED CHARGING
assumed by software. The state machine will no longer determine the mode of charging. The only exceptions to this are a charger
removal, a charger over-voltage detection and excessive power dissipation in M1/M2.
operation mode.
through FETCTRL (1 = conducting). The latter is only possible if the FETOVRD bit is set. If a sudden drop in BP occurs (BP <
BPON) while M3 is open, the charger control logic will immediately close M3 under the condition that BATT > BATTMIN.
96
Table 77. Charger Timer Characteristics
Table 78. Charger Fault Conditions
13892
Charger Timer
Precharge Timer
Cleared or no fault condition
Over-voltage at CHRGRAW
Excessive dissipation on M1/M2
Sudden battery drop below BATTMIN
Any charge time-out
Out of temperature
The precharge will time-out and stop charging, in case it did not succeed in raising the battery to a high enough level: BATTON
The charging circuit will stop charging and generate a CHGCURRI interrupt after the battery is fully charged. This is detected
During charging, a charge timer is running. When expiring before the CHGCURR limit is reached, the charging will be stopped
Out of any state and after a time-out, the charger state machine can be restarted by removing and reapplying the charger. A
The state of the charger logic is reflected by means of the CHGENS bit. This bit is therefore a 1 in all states of the charger
The detection of a serial path versus a single path is reflected through the CHRGSSS bit. A logic 1 indicates a serial path. In
The charging circuit will stop charging, in case the die temperature of the IC exceeds the thermal protection threshold. The
The charger can also be operated under software control. By setting CHGAUTOB = 1, full control of the charger settings is
For safety reasons, when a RESETB occurs, the software controlled charging mode is exited for the standalone charging
In the software controlled charging mode, the internal trickle charger settings can be controlled as well as the M3 operation
Parameter
Fault Condition
External precharge 80 mA
Internal precharge 40/80 mA
External precharge 400/560 mA
Condition
CHGFAULTS[1:0]
00
01
01
10
10
11
Min
-
-
-
Analog Integrated Circuit Device Data
Typ
120
270
60
Not generated
CHGFAULTI
Rising edge
Rising edge
Rising edge
Rising edge
Freescale Semiconductor
Dual edge
Max
-
-
-
Units
min
min
min