参数资料
| 型号： | PS700T-I/ST |
| 厂商： | Microchip Technology |
| 文件页数： | 8/38页 |
| 文件大小： | 0K |
| 描述： | IC BATT MONITOR 1-2CELL 8TSSOP |
| 标准包装： | 1 |
| 功能： | 电池监控器 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 2.7 V ~ 9 V |
| 工作温度： | -20°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 8-TSSOP |
| 包装： | 剪切带 (CT) |
| 其它名称： | PS700T-I/STCT |
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PS700
3.1.8
CHARGE/DISCHARGE TIME
3.2.1
RUN MODE
COUNTERS
The Charge Time Counter (CTC) will increment at the
rate of 2 counts every second as long as a negative
voltage is measured at the SR pin. The CTC can
thereby maintain a time count representing the total
time that charge current has flowed into the battery.
The Discharge Time Counter (DTC) will increment at
the rate of 2 counts every second as long as a positive
voltage is measured at the SR pin. The DTC can
thereby maintain a time count representing the total
time that discharge current has flowed from the battery.
During Run mode, the PS700 performs continuous A/D
conversion cycles per the programming of the A/D
cycle, between 1 and 8 conversions are performed and
the accumulators/time counters are updated as
programmed by the user.
Run mode is entered following a Power-on Reset when
the pack voltage (V PACK ) applied on the VC1 pin rises
above the V POR threshold. Run mode can also
be entered from the Sample, Sample-Sleep and
Shelf-Sleep modes as described below.
3.1.9
GENERAL PURPOSE
ACCUMULATORS
The PS700 will remain in Run mode as long as the pack
voltage is above the V POR threshold and the Sample,
There are two general purpose accumulators, TA and
Sample-Sleep and Shelf-Sleep modes are not active.
VC2A. For typical applications, these accumulators
have been assigned specific functions. The user can
3.2.2
SAMPLE MODE
redefine the use of these accumulators to fit the design
requirements.
TA can be used to accumulate results from the ITres or
ETres registers. Accumulation to TA must be enabled
in the Accumctrl register bit “AccT”. The selection for
accumulation of the values represented by the internal
or external thermistor is also determined in the
Accumctrl register bit “tsel”.
VC2A can be used to accumulate results from VC2res.
Accumulation in VC2A must be enabled in the
Accumctrl register bit “AccV”. The value stored in
VC2res corresponds to the measurement as defined in
the A/D Control register VC2ctrl. This function is
utilized if the VC2 pin is configured as an independent
A/D input and not connected to the cell stack.
The “Accum” bit in the Accumctrl register must be
enabled for accumulation to occur in TA and VC2A.
In Sample mode, A/D measurements are not continu-
ously performed as in Run mode. Instead, they are
performed at a user selectable rate. The purpose of
Sample mode is to reduce power consumption during
periods of low rate charge or discharge. The power
advantage of Sample mode comes from the reduction
in frequency of A/D measurements.
Sample mode is entered by programming the “Samp”
bit = 1 in the A/D Configuration register. The PS700 will
remain in Sample mode as long as “Samp” bit = 1 and
the VC1 voltage is above the V POR threshold and the
Sample-Sleep and Shelf-Sleep modes are not active.
Run mode will be resumed when the Samp bit is
cleared to ‘ 0 ’.
The Sample mode rate is selected using the “SampDiv”
bits within the A/D Configuration register. The sample
interval is 2**(SampDiv) * 0.5 sec. The possible sample
rate intervals are as follows.
3.1.10
GENERAL PURPOSE TIMERS
There are two general purpose timers that are enabled
TABLE 3-6:
SAMPLE RATE INTERVALS
by accumulation in the TA and VC2A accumulators.
TAT is used to maintain a time count during accumula-
tion in the TA register. This timer increments at a
frequency of 2 counts every second.
VC2T is used to maintain a time count during
accumulation in the VC2A register. This timer
increments at a frequency of 2 counts every second.
“SampDiv”
Value = 0
Value = 1
Value = 2
Value = 3
Value = 4
Value = 5
Sample Interval
0.5s
1.0s
2.0s
4.0s
8.0s
16.0s
3.2
Power Modes
Value = 6
32.0s
The PS700 has four operational power modes: Run,
Value = 7
64.0s
Sample, Sample-Sleep and Shelf-Sleep. Each con-
sumes power according to the configuration settings as
described in the following sections.
DS21760F-page 8
In Sample mode, much of the analog circuitry remains
on. Therefore, the power savings are not as great as in
Sample-Sleep mode (described below). Refer to
cation of the amount of current consumed in Sample
mode.
? 2004 Microchip Technology Inc.
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