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| 型号： | PS501-I/SS |
| 厂商： | Microchip Technology |
| 文件页数： | 26/42页 |
| 文件大小： | 0K |
| 描述： | IC FIELD REPROG BATT MGR 28SSOP |
| 标准包装： | 47 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion）、锂聚合物（Li-Pol） |
| 电源电压： | 5.6 V ~ 18 V |
| 工作温度： | -20°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 28-SSOP |
| 包装： | 管件 |
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PS501
TABLE 9-2:
CAPACITY CALCULATIONS
Parameter
Name
# Lower Upper Typical
Bytes Limit Limit Value
Operational Description
CurrError
1
0
255
1
Current measurement error. This is the error due to the
accuracy of the A/D converter to measure and integrate the
current, 255 = 24.9%.
Cycles
2
0
65535
0
SBData register for CycleCount . Cycles is updated to keep
track of the total usage of the battery. Cycles is increased
whenever an amount of charge has been delivered to or
removed from the battery, equivalent to the full capacity. For a
4000 mAh battery, Cycles is increased every time 4000 mAh
goes through the battery terminals in any direction.
InitialCap
2
0
65535
2048
The initial capacity of the battery. When the PS501 is first
powered up and initialized, before a learning cycle takes place
to learn the full capacity, the full capacity will take the value
programmed into InitialCap to compute relative
State-Of-Charge percentage.
LowCurrError
1
0
255
25
Current offset for error calculation. Since the error of the A/D
converter is proportional to the level of current it is measuring,
the error term can be too low when the current is very low. For
this reason, the LowCurrError will compensate the ERR term
for low currents. LowCurrError milli-Amps are added to the
current when factoring in the error. Thus, the error is:
Error = (Current + LowCurrError ) * CurrError .
NChangeState
1
0
255
8
State change delay filter. Delays the change between “charge
increasing” state and “charge decreasing” state based on current
direction. To avoid problems with current spikes in opposite
directions, a delay filter is built-in to control when to change from
charging status to discharging status. The current must change
directions and stay in the new direction for CST_DELAY * period
before the status is changed and capacity is increased or
decreased as a result of the new current direction.
NullCurr
1
0
255
3
A zero zone control is built into the PS501 so that any small
inaccuracy doesn’t actually drain the gas gauge, when in fact
the current is zero. For this reason, current less than NullCurr
mA in either direction will be measured as zero.
PwrConsumption
1
0
65535
140
Current consumption of the battery module. This is the average
current that the battery module typically draws from the battery
(255 = 1 mA).
SelfDischrgErr
1
0
255
1
Self-discharge error. This is the error inherent in the ability of
the self-discharge look-up tables to meet actual battery
characteristics, 255 = 100%.
DS21818C-page 26
? 2004 Microchip Technology Inc.
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