參數(shù)資料
型號(hào)： LQA48B
廠商： National Semiconductor Corporation
英文描述： Cellular Phone Power Management Unit
中文描述： 蜂窩電話電源管理單元
文件頁(yè)數(shù)： 21/32頁(yè)
文件大?。?/td> 761K
代理商： LQA48B
ADC and Charger Programming
(Continued)
A/D Input Selection Code
MUX-0
1
BATT-ID (200 μA Scale)
MUX-1
1
Input
Charger Current Selection Code
Data Code
4h’01
4h’02
4h’03
4h’04
4h’05
4h’06
4h’07
4h’08
4h’09
I
SET
(mA)
530
574
617
660
703
746
789
832
874
The following table is the conversion table for main battery
charger current measurement using the on-chip ADC. Tem-
perature dependency is due to the temperature coefficient of
the aluminum sense resistor. The ADC itself is temperature
compensated as is the charging current in the main battery
charger.
A/D Converter’s Charge Current Output Code
ADC Control Register Code 2h’0X
Device Temperature 40C
I
CHARGE
(mA)
0
Output Code
h’00
Device Temperature +25C
I
CHARGE
(mA)
0
Output Code
h’00
4.97
h’01
…
1262
h’fe
1267
h’ff
3.95
h’01
…
1003
h’fe
1007
h’ff
A/D Converter’s Charge Current Output Code
ADC Control Register Code 2h’0X
Device Temperature +85C
I
CHARGE
(mA)
0
Output Code
h’00
3.27
h’01
…
831
h’fe
834
h’ff
The next table shows the relationship between ADC output
code and main battery voltage in ADC Battery Voltage Mea-
surement Mode.
A/D Converter’s Battery Voltage Output Code
ADC Control Register Code 2h’0X
Battery Voltage (V)
3.000
Output Code
h’00
3.006
h’01
…
4.494
h’fe
4.500
h’ff
The battery ID resistor value can be determined using the
following table in the two ADC Battery ID Modes.
Battery ID Detection Code
ADC Control Register Code 2h’0X
ID Resistor (k
)
Scale 1 (200 μA)
Data Code Range
0.22
h’00–h’12
0.75
h’13–h’32
1.8
h’33–h’65
3.3
h’66–h’a7
5.1
10
15
22
33
55
Scale 1 (20 μA)
Data Code Range
h’a8–h’ff
h’1e–h’31
h’32–h’49
h’4a–h’6d
h’6e–h’b0
h’b1–h’ff
ADC Block Functional Diagram
The ADC block provides four different functions on the LP3941A:
Main battery voltage measurement
Main battery charger charging current measurement
Battery ID resistor resistance measurement with 200 μA sense current
Battery ID resistor resistance measurement with 20 μA sense current
The following picture shows the implementation of these measurements with the ADC.
L
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