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| 型号： | PS501T-I/SS |
| 厂商： | Microchip Technology |
| 文件页数： | 8/42页 |
| 文件大小： | 0K |
| 描述： | IC BATTERY MANAGER REPROG 28SSOP |
| 标准包装： | 1 |
| 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： | 标准包装 |
| 其它名称： | PS501T-I/SSDKR |
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PS501
3.0
OPERATIONAL MODES
EXAMPLE 3-1:
CONFIGURATION
The PS501 operates on a continuous cycle. The
frequency of the cycles depends on the power mode
selected. There are four power modes: Run, Sample,
Sleep and Shelf-Sleep. Each mode has specific entry
and exit conditions as listed below.
Measurement period is 500 ms
SampleLimit is set to 20
NSample is set to 16
Result:
Run/Sample mode entry-exit threshold = 20 mA
3.1
Run Mode
During Sample mode, measurements will occur
every:
Whether the PS501 is in Run mode or Sample mode
depends on the magnitude of the current. The Run and
16 measurement periods of 500 mS = every 8 seconds
Sample mode entry-exit threshold is calculated using
the EEPROM parameter, SampleLimit .
3.3
Low-Voltage Sleep Mode
SampleLimit is a programmable EEPROM value and
CFCurr is an EEPROM value set by calibration.
Entry to Run mode occurs when the current is more
than +/- SampleLimit mA for two consecutive mea-
surements. Run mode may only be exited to Sample
mode, not to Sleep mode, when Sample mode is
enabled. Exit from Run mode to Sample mode occurs
when the converted measured current is less than the
+/- SampleLimit mA threshold for two consecutive
measurements.
Run mode is the highest power consuming mode.
During Run mode, all measurements and calculations
occur once per measurement period. Current, voltage
and temperature measurements are each typically
made sequentially during every measurement period.
Entry to Sleep mode can only occur when the
measured pack voltage at the VC(1) input is below a
preset limit, set by the EEPROM value SleepVPack (in
mV). Sleep mode may be exited to Run mode, but only
when one of the wake-up conditions is satisfied.
While in Sleep mode, no measurements occur and no
calculations are made. The fuel gauge display is not
operational, no SMBus communications are recog-
nized and only a wake-up condition will permit an exit
from Sleep mode. Sleep mode is one of the lowest
power consuming modes and is used to conserve
battery energy following a complete discharge.
There are two levels of Low-Voltage Sleep mode that
can be used, each with a different wake-up criteria.
Default Low-Power mode will use 25 μ A typical and will
wake-up when the voltage exceeds the WakeUp voltage
3.2
Sample Mode
level. By setting bit 1 of the WakeUp register to ‘ 1 ’, the
Entry to Sample mode occurs when the measured
current is less than +/- SampleLimit (EE parameter)
two consecutive measurements. Sample mode may be
exited to either Run mode or Sleep mode.
Ultra Low-Power mode can be used. This will be entered
by low voltage, but wake-up occurs by pulling the
SMBus lines high. Ultra Low-Power mode uses less
than 1 μ A.
While in Sample mode, measurements of voltage, cur-
3.4
Shelf-Sleep Mode
rent and temperature occur only once per NSample
counts of measurement periods, where NSample is a
programmable EEPROM value. Calculations of State-
Of-Charge, SMBus requests, etc. still continue at the
normal Run mode rate, but measurements only occur
once every measurement period x NSample . The
minimum value for NSample is two.
The purpose of Sample mode is to reduce power con-
sumption during periods of inactivity (low rate charge or
discharge). Since the analog-to-digital converter is not
active, except every NSample counts of measurement
periods, the overall power consumption is significantly
reduced.
DS21818C-page 8
Shelf-Sleep mode is used to put the PS501 into Low-
Power mode, regardless of voltage level, for long term
storage of battery packs. It is entered by an SMBus
command. It is exited by the conditions selected in the
WakeUp register. These can be voltage, GPIO or
SMBus activity. If any of these four are selected for
wake-up, the Shelf-Sleep mode will be Low-Power
mode and will draw 25 μ A typical. If none of these
options are selected and bit 3 of the WakeUp register
is set, the Shelf-Sleep mode will be Ultra Low-Power
mode, which will draw less than 1 μ A and wake-up will
be by pulling SMBus high.
? 2004 Microchip Technology Inc.
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