参数资料
型号: KIT13892VLEVBEJ
厂商: Freescale Semiconductor
文件页数: 95/158页
文件大小: 0K
描述: KIT EVAL FOR MC13892
标准包装: 1
主要目的: 电源管理和用户界面
嵌入式:
已用 IC / 零件: MC13892
主要属性: 10 位 ADC,4 输出降压转换器,12 LDO
次要属性: 与 i.MX51、i.MX37、i.MX35、i.MX27 一起使用
已供物品: 板,线缆,文档
FUNCTIONAL DEVICE OPERATION
BATTERY INTERFACE AND CONTROL
Table 72. Charger Detectors Main Characteristics (continued)
Parameter
Debounce Period
Condition
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
Min
Typ
32
1.0
1.0
1.0
100
1.0
100
Max
Units
ms
s
s
s
ms
ms
ms
Crossing the thresholds BATTCYCL and CHGCURR will generate the interrupts CCCVI and CHGCURRI respectively. These
interrupts can be used as a simple way to implement a three-bar battery meter.
BATTERY THERMISTOR CHECK CIRCUITRY
A battery pack may be equipped with a thermistor, which value decreases over temperature (NTC). The relationship between
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 PU .
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 Table 73 . Charging is generally allowed when the thermistor is within the range,
see next section for details.
Table 73. Battery Thermistor Check Main Characteristics
Temperature Threshold
Voltage at ADIN5
Corresponding Resistor Values
Rpu RT
Corresponding Temperature (in °C) *
B=3200 B=3500 B=3900
T LOW
T HIGH
24/32 * GPO1
10/32 * GPO1
10 k
10 k
30 k
4.5 k
-3.0
+49
0.0
+46
+2.0
+44
CHARGE LED INDICATOR
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
at the CHRGLED pin for an LED connected to CHRGRAW.
The LED will be activated when standalone charging is started, and will remain under control of the state machine also when
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.
Table 74. Charge LED Drivers Main Characteristics
Parameter
Trickle LED current
Condition
CHRGLED = 2.5 V
CHRGLED = 0.7 V
Min
5.0
Typ
Max
8.0
Units
mA
mA
Notes
81. Above conditions represent respectively a USB and a collapsed charger case
Table 75. Charge LED Driver Control
CHRGLEDEN
0 (default)
1
CHRGLED
Auto
On
MC13892
Analog Integrated Circuit Device Data
Freescale Semiconductor
95
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