LG KU580 Service Manual - Page 60

Fuel Gauge

Get LG KU580 PDF manuals and user guides View all LG KU580 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 60 highlights

3. Technical Brief 3.5.1 Fuel Gauge AB2010 supports the measurement of the current consumption/charging current in the U8100 with a fuel gauge block. By constantly integrating the current flowing into and out of the battery, the fuel gauge block is used to determine the remaining battery capacity. The function of the fuel gauge block is schematically described in (Fig.2-5-3). A sense resistor R_FGSENSE is connected in series with the battery. The voltage across the resistor, equivalent to the current entering/leaving the battery, is integrated using an ADC block. Fig. 3-5-3. The analog front-end of the fuel gauge block Fig. 3-5-4 The Schematic of the fuel gauge block Name FGSENSE+ FGSENSE- Type Analog Analog Unused VBAT VBAT Description Fuel gauge current sensing input positive Fuel gauge current sensing input negative Table 3-5-2. Fuel Gauge channel spec Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes - 61 - LGE Internal Use Only

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
  • 117
  • 118
  • 119
  • 120
  • 121
  • 122
  • 123
  • 124
  • 125
  • 126
  • 127
  • 128
  • 129
  • 130
  • 131
  • 132
  • 133
  • 134
  • 135
  • 136
  • 137
  • 138
  • 139
  • 140
  • 141
  • 142
  • 143
  • 144
  • 145
  • 146
  • 147
  • 148
  • 149
  • 150
  • 151
  • 152
  • 153
  • 154
  • 155
  • 156
  • 157
  • 158
  • 159
  • 160
  • 161
  • 162
  • 163
  • 164
  • 165
  • 166
  • 167
  • 168
  • 169
  • 170
  • 171
  • 172
  • 173
  • 174
  • 175
  • 176
  • 177
  • 178
  • 179
  • 180
  • 181
  • 182
  • 183
  • 184
  • 185
  • 186
  • 187
  • 188
  • 189
  • 190
  • 191
  • 192
  • 193
  • 194
  • 195
  • 196
  • 197
  • 198
  • 199
  • 200
  • 201
  • 202
  • 203
  • 204
  • 205
  • 206
  • 207
  • 208
  • 209
- 61 -
3. Technical Brief
LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc.
All right reserved.
Only for training and service purposes
3.5.1 Fuel Gauge
AB2010 supports the measurement of the current consumption/charging current in the U8100 with a
fuel gauge block. By constantly integrating the current flowing into and out of the battery, the fuel
gauge block is used to determine the remaining battery capacity.
The function of the fuel gauge block is schematically described in (Fig.2-5-3). A sense resistor
R_FGSENSE is connected in series with the battery. The voltage across the resistor, equivalent to the
current entering/leaving the battery, is integrated using an ADC block.
Fig. 3-5-3. The analog front-end of the fuel gauge block
Fig. 3-5-4 The Schematic of the fuel gauge block
Table 3-5-2. Fuel Gauge channel spec
Name
Type
Unused
Description
FGSENSE+
Analog
VBAT
Fuel gauge current sensing input positive
FGSENSE-
Analog
VBAT
Fuel gauge current sensing input negative