MC13892JVLR2 Freescale, MC13892JVLR2 Datasheet - Page 94

• 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

Table 74. Charge LED Drivers Main Characteristics
FUNCTIONAL DEVICE OPERATION
BATTERY INTERFACE AND CONTROL
interrupts can be used as a simple way to implement a 3-bar battery meter.
BATTERY THERMISTOR CHECK CIRCUITRY
temperature T (in Kelvin) and the thermistor value (RT) is well characterized and can be described as RT = R0*e^(B*(1/T-1/T0),
with T0 being room temperature, R0 the thermistor value at T0 and B being the so called B-factor which indicates the slope of
the thermistor over temperature. In order to read out the thermistor value, it is biased from GPO1 through a pull-up resistor R
See also the ADC chapter. The battery thermistor check circuit compares the fraction of GPO1 at ADIN5 with two preset
thresholds, which correspond to 0 and 45 °C, see
see next section for details.
CHARGE LED INDICATOR
at the CHRGLED pin for an LED connected to CHRGRAW.
the application is powered on. At the end of charge, the LED is automatically disabled. Through the CHRGLEDEN bit, the LED
can be forced on. In software controlled charging, the LED is under full control of this CHRGLEDEN bit.
94
Table 73. Battery Thermistor Check Main Characteristics
13892
Table 72. Charger Detectors main characteristics
Notes
69.
Temperature Threshold
Trickle LED current
Tlow
Thigh
Crossing the thresholds BATTCYCL and CHGCURR will generate the interrupts CCCVI and CHGCURRI respectively. These
A battery pack may be equipped with a thermistor, which value decreases over temperature (NTC). The relationship between
Since normal LED control via the SPI bus is not always possible in the charging mode, an 8.0 mA max current sink is provided
The LED will be activated when standalone charging is started, and will remain under control of the state machine also when
Charger Valid
CHGCURR Threshold
Debounce Period
Above conditions represent respectively a USB and a collapsed charger case
Parameter
Parameter
24/32 * GPO1
10/32 * GPO1
Voltage at ADIN5
CHRGRAW
CHRGISNS-BPSNS, current from charger
BATTMIN, BATTON rising edge (normal
BATTMIN, BATTON rising edge (slow)
BATTMIN falling edge (slow)
BATTMIN falling edge (fast)
BATTCYCL dual edge
CHGCURR
Charger Detect dual edge
Table 75. Charge LED Driver Control
CHRGLED = 2.5 V
CHRGLED = 0.7 V
CHRGLEDEN
Table
0 (default)
Condition
Corresponding Resistor Values
1
73. Charging is generally allowed when the thermistor is within the range,
Rpu
10 k
10 k
Condition
30 k
45 k
RT
CHRGLED
Auto
On
Min
10
-
-
-
-
-
-
-
-
Min
5.0
-
B=3200
Corresponding Temperature (in °C) *
-3.0
+49
Analog Integrated Circuit Device Data
Typ
100
100
3.8
1.0
1.0
1.0
1.0
32
-
Typ
-
-
B=3500
Freescale Semiconductor
+46
0
Max
50
-
-
-
-
-
-
-
-
Max
8.0
-
B=3900
Units
+2.0
+44
mA
Units
ms
ms
ms
ms
V
s
s
s
mA
mA
PU
.