参数资料
| 型号： | PS700T-I/ST |
| 厂商： | Microchip Technology |
| 文件页数： | 4/38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
2.0
ARCHITECTURAL OVERVIEW
2.4
EEPROM Memory
The PS700 contains a complete analog “front-end” for
battery monitoring as well as digital logic for control, mea-
surement accumulation, timing and communications.
Major functions within the PS700 include:
512 bytes of EEPROM memory are incorporated for
storage of nonvolatile parameters, such as
PowerSmart ? 3D cell models for use with host driver
firmware. An initialization block is reserved within the
?
?
Voltage Regulator
Precision Time Base
EEPROM array for values that are loaded into PS700
registers following a power-on condition.
?
?
Temperature Sensor
512-Byte EEPROM Memory
2.5
RAM Memory
?
?
32-Byte RAM Memory
Analog-to-Digital (A/D) Converter
32 bytes of general purpose RAM memory are
provided for storage of temporary parameters.
?
?
32-bit Accumulators/Timers
SMBus/I 2 C Communications Interface
2.6
A/D Converter
the PS700. Figure 1-2 is a schematic diagram that
depicts the PS700 in a typical single cell Lithium Ion
application. The function of each of the blocks listed
above is summarized in the following sections.
The PS700 incorporates an integrating sigma-delta
A/D converter together with an analog mux that has
inputs for charge and discharge current, cell and pack
voltages, the on-chip temperature sensor and an off-
chip thermistor. The converter can be programmed to
perform a conversion with resolutions of 8 to 15 bits plus
2.1
Internal Voltage Regulator
sign while utilizing either a ±340 mV or a ±170 mV
reference.
The PS700 incorporates an internal voltage regulator
that supports 1 or 2-cell series lithium pack configura-
2.7
32-Bit Accumulators/Timers
tions. The internal regulator draws power directly from
the VC1 input. No other external components are
required to regulate internal supply voltage.
The PS700 incorporates four 32-bit accumulators and
four 32-bit elapsed time counters. The Discharge
Current Accumulator (DCA) and the Charge Current
2.2
Precision Time Base
Accumulator (CCA) are intended to record discharge
and charge capacity values. The Discharge Time
The integrated precision time base is a highly accurate
RC oscillator that provides precise timing for the sigma-
delta A/D and for the on-chip elapsed time counters
without the need for an external crystal. This time base
is trimmed during manufacturing to a nominal
frequency of 131,072 Hz.
Counter (DTC) and the Charge Time Counter (CTC)
are intended to maintain the total discharge time and
charge time. Accumulated charge and discharge
values can be used to determine state of charge of the
battery as well as cycle count information. With
information provided by the elapsed time counters,
average charge and discharge currents over an
2.3
Temperature Sensor
extended period of time can be calculated.
An integrated temperature sensor is provided that can
2.8
SMBus/I 2 C Communications
eliminate the need for an external thermistor. As an
option, a connection is provided for an external
thermistor for applications where the battery pack is
physically located at a distance away from the PS700.
DS21760F-page 4
Interface
The communications port for the PS700 is a 2-wire
industry standard SMBus/I 2 C interface. All commands,
status and data are read or written from the host
system via this interface.
? 2004 Microchip Technology Inc.
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