参数资料
| 型号： | PS700T-I/ST |
| 厂商： | Microchip Technology |
| 文件页数： | 5/38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
3.0
3.1
OPERATIONAL DESCRIPTION
A/D and Accumulator/Timer
the next register. In this manner, the user can specify a
sequence of conversions that will be performed during
each A/D cycle.
Operation
3.1.1 A/D CONVERSION CYCLE
When the A/D converter is enabled and active, it
repeatedly performs a cycle of 1 to 8 conversions as
programmed by the user through 8 A/D Control
registers. These registers determine the input source,
resolution, reference voltage source and sequence of
conversions during an A/D converter cycle. During the
cycle, the A/D logic accesses each register in
sequence and performs the conversion specified by the
bits within the register. This register contains an enable
bit, a resolution field, a select bit for a single-ended or
differential reference and a select field for the analog
input mux. The results from each conversion are stored
in one of eight corresponding16-bit result registers.
If the “enable” bit is set within a control register, a
conversion will be performed. If it is disabled, that
conversion will be skipped and the logic will move on to
As stated above, the input source for each of the
registers is programmable. The 3-bit mux field within
each control register selects one of seven possible
input sources for the A/D conversion. The list of input
sources is as follows:
? Charge/Discharge Current (voltage from SR pin to
GND)
? Internal Temperature Sensor
? External Thermistor (constant current source on
NTC pin)
? Battery Pack Voltage
? VC1 Voltage
? VC2 Voltage
? A/D Offset (conversion performed with input
shorted internally to determine offset error
associated with the converter)
However, the accumulator/timer functions are “hard
wired” to specific A/D Result registers. For this reason,
the control/result registers are given names which
indicate their primary intended usage (see Table 3-1).
TABLE 3-1:
A/D CONTROL/RESULT REGISTERS
A/D Register #
0
1
2
3
4
5
6
Control Register
Ictrl
ITctrl
ETctrl
VPctrl
VC1ctrl
VC2ctrl
OFFSctrl
Result Register
Ires
ITres
ETres
VPres
VC1res
VC2res
OFFSres
Intended Input Source
Battery Pack Current (via sense resistor)
Internal Temperature Sensor
External Temperature Sensor
Battery Pack Voltage (VC1 to GND)
Battery Cell Voltage (VC1 to VC2)
Battery Cell Voltage (VC2 to GND)
Internal A/D Offset Voltage (A/D input automatically
internally shorted to GND)
7
AUXctrl
AUXres
Any
The 3-bit “resolution” field in each A/D Control register
determines the resolution of the conversion, from a
minimum of 9 bits (8 bits plus sign bit) to a maximum of
16 bits (15 bits plus sign bit). The time required to
complete the conversion is a function of the number of
bits of resolution (n) selected. The conversion time can
be calculated as follows:
T ADC = 30.52 μ s * 2 n
The value of the LSB can be expressed as a function of
the resolution selected as follows:
A/D LSB = 680/340 mV/2 n
where:
“n” is the number of bits of resolution selected
The result value is given in sign/magnitude format (i.e.,
a sign bit with a 15-bit magnitude).
where:
“n” is the number of bits of resolution selected
The “Ref” bit selects the magnitude of the reference
voltage. Either a ±340 mV or a ±170 mV reference is
available. The ±170 mV reference is typically used for
current readings and the ±340 mV reference for all
other measurements.
? 2004 Microchip Technology Inc.
15
S
Magnitude
0
DS21760F-page 5
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