参数资料
型号: KIT13892VLEVBEJ
厂商: Freescale Semiconductor
文件页数: 94/158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 69. Internal Trickle Charger Control
BATT
0 < BATT < BATTMIN
BATTMIN < BATT < BATTON
Table 70. Internal Trickle Charger Characteristics
Trickle Charge Current (mA)
40
80
Parameter
Trickle Charge Current Accuracy
Operating Voltage
Extended Operating Range (80)
Condition
BATTISNS
BP-BATTISNS
BP-BATTISNS
Min
0.0
1.0
0.3
Typ
Max
30
Units
%
V
V
V
Notes
80. The effective trickle current may be significantly reduced
CHARGER DETECTION AND COMPARATORS
The charger detection is based on three comparators. The “charger valid” monitors CHRGRAW, the “charger presence” that
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
Setting ICHRG[3:0]
0000, 0001
Other Settings
Charger Valid
Comparator
0
1
1
X
X
X
Charger Presence
Comparator
X
0
1
0
1
X
CHGCURR Comparator
X
X
X
0
X
1
Charger Detected
No
No
Yes
No
Yes
Yes
In addition to the aforementioned comparators, three more comparators play a role in battery charging. These comparators
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.
Table 72. Charger Detectors Main Characteristics
Parameter
BATTMIN Threshold
BATTON Threshold
BATTCYCL Threshold
Charger Presence
Charger Valid
CHGCURR Threshold
Condition
At BATT
At BATT
At BPSNS relative to VCHRG[2:0]
CHRGRAW-BPSNS
CHRGRAW
CHRGISNS-BPSNS, current from charger
Min
2.9
3.3
10
10
Typ
98
3.8
Max
3.1
3.5
50
50
Units
Volts
Volts
%
mV
V
mA
MC13892
Analog Integrated Circuit Device Data
94
Freescale Semiconductor
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