參數(shù)資料
型號(hào)： DS2782
廠(chǎng)商： Maxim Integrated Products, Inc.
英文描述： Stand-Alone Fuel Gauge IC
中文描述： 獨(dú)立式電量計(jì)IC
文件頁(yè)數(shù)： 14/25頁(yè)
文件大?。?/td> 291K
代理商： DS2782
DS2782: Stand-Alone Fuel Gauge IC
14 of 25
applications, Standby Empty represents the point that the battery can no longer support RAM refresh and thus the
standby voltage is set by the RAM voltage supply requirements. In other applications, Standby Empty can
represent the point that the battery can no longer support a subset of the full application operation, such as games
or organizer functions on a wireless handset. The standby load current and voltage are used for determining the
cell characteristics but are not programmed into the DS2782. The DS2782 reconstructs the Standby Empty line
from cell characteristic table values to determine the Standby Empty capacity of the battery at each temperature.
Reconstruction occurs in one-degree temperature increments.
CELL MODEL CONSTRUCTION
The model is constructed with all points normalized to the fully charged state at +40°C. Initial values, the +40°C
Full value in mVh units and the +40°C Active Empty value as a fraction of the +40°C Full are stored in the cell
parameter EEPROM block. Standby Empty at +40°C is by definition zero and therefore no storage is required. The
slopes (derivatives) of the 4 segments for each model curve are also stored in the cell parameter EEPROM block.
Segment endpoints are fixed at 0°C, +10°C, +20°C, +30°C and +40°C. An example of data stored in this manner is
shown in Table 1.
Table 1. Example Cell Characterization Table (Normalized to +40°C)
Manufacturers rated cell capacity: 1000mAh
Charge Voltage: 4.2V
Charge Current: 500mA
Active Empty (V, I): 3.0V, 300mA
Standby Empty (V, I): 3.0V, 4mA
Sense Resistor: 0.020
+40 C
Nominal
[mAh]
Full
1051
0.927
0.951
Active Empty
0.051
0.040
Standby Empty
0.013
0.0067
Figure 13. Lookup Function Diagram
Termination Current: 50mA
0°C
+10°C
+20°C
+30°C
+40°C
0.974
0.022
0.0038
0.991
0.012
0.001
1.0
0.008
0
APPLICATION PARAMETERS
In addition to cell model characteristics, several application parameters are needed to detect the full and empty
points, as well as calculate results in mAh units.
Sense Resistor Prime (RSNSP):
RSNSP stores the value of the sense resistor for use in computing the absolute
capacity results. The value is stored as a 1-byte conductance value with units of mhos. RSNSP supports resistor
values of 1 to 3.922m . RSNSP is located in the Parameter EEPROM block.
Charge Voltage (VCHG):
VCHG stores the charge voltage threshold used to detect a fully charged state. The
value is stored as a 1-byte voltage with units of 19.52mV and can range from 0V to 4.978V. VCHG should be set
marginally less than the cell voltage at the end of the charge cycle to ensure reliable charge termination detection.
VCHG is located in the Parameter EEPROM block.
Cell Model
Parameters
15 bytes
(EEPROM)
Temperature
Lookup
Function
FULL(T)
AE(T)
SE(T)
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