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参数资料
| 型号： | MAX71020AEUI+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 20/35页 |
| 文件大小： | 0K |
| 描述： | IC ENERGY METER 1PH 28TSSOP |
| 标准包装： | 50 |
| 输入阻抗： | 50 千欧 ~ 100 千欧 |
| 测量误差： | 0.5% |
| 电压 - 高输入/输出： | 2V |
| 电压 - 低输入/输出： | 0.8V |
| 电流 - 电源： | 4.3mA |
| 电源电压： | 2.8 V ~ 3.6 V |
| 测量仪表类型： | 单相 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 28-TSSOP |
| 包装： | 管件 |
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MAX71020
Single-Chip Electricity Meter AFE
Crystal Oscillator
The oscillator drives an AT cut microprocessor crystal at
a frequency of 9.8304MHz. Board layouts with minimum
capacitance from XIN to XOUT require less current.
Good layouts have XIN and XOUT shielded from each
other and from digital signals.
Since the oscillator is self-biasing, an external
resistor must not be connected across the
crystal.
Meter Calibration
Once the MAX71020 energy meter device has been
installed in a meter system, it must be calibrated. A com-
plete calibration includes the following:
● Establishment of the reference temperature (e.g., typi-
cally 22 N C).
● Calibration of the metrology section, i.e., calibration
for tolerances of the current sensors, voltage-dividers,
and signal conditioning components as well as of the
internal reference voltage (VREF) at the reference
temperature (e.g., typically 22 N C).
The metrology section can be calibrated using the gain
and phase adjustment factors accessible to the CE. The
gain adjustment is used to compensate for tolerances of
components used for signal conditioning, especially the
resistive components. Phase adjustment is provided to
compensate for phase shifts introduced by the current
sensors or by the effects of reactive power supplies.
The MAX71020 supports common industry-standard cali-
bration techniques, such as single-point (energy-only)
and multipoint (energy, V RMS , I RMS ).
The load engine seeds some CE and hardware control
registers with default values required for proper opera-
tion of the CE code, but not the calibration registers
(CAL_IA, CAL_VA, etc., and PHADJ_A and PHADJ_B)
and a variety of other registers that need to change
dynamically. The default values shown in Table 7 apply
to ideal sensors and an ideal trim value of VREF.
Calibration yields non-default values for the calibration
registers. Storage of the calibration registers should be
implemented in the host, and on power-up or after reset,
the host must write the stored values into the calibra-
tion registers of the MAX71020. If the meter constant or
any other of the parameters listed in Table 7 had been
changed from default, the host must also update these
values on power-up and after reset.
Table 7 lists in the column LOADED BY the source that
is used to seed the value. Host means that the host
controller is responsible for loading the value into the CE
RAM upon reset or power-up. The host must ensure that
the registers labeled “Host” are maintained, preserved,
and checked whenever the MAX71020 reports a reset
or supply power event in its M_STAT register. LE means
that the Load Engine provides the data for the register.
The registers labeled R in the R/W column need not be
seeded with values ( — in LOADED BY column).
Host Controller Interface
Register Map
Table 7. Register Map
NAME
CAL_I0
CAL_V0
PHADJ_0
CAL_I1
CAL_V1
PHADJ_1
DEGSCALE
BYTE
ADDRESS
0x010
0x011
0x012
0x013
0x014
0x015
0x01A
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
DEFAULT
VALUE
0x0000 4000
0x0000 4000
0x0000 0000
0x0000 4000
0x0000 4000
0x0000 0000
0x0000 6A8F
DESCRIPTION
Calibration coefficient for current channel A. Default =
unity gain
Calibration coefficient for voltage channel A.
Phase adjust coefficient for channel A. Default = no
phase adjust.
Calibration coefficient for current channel B.
Calibration coefficient for voltage channel B.
Phase adjust coefficient for channel B.
Internal constant
LOADED
BY
Host
Host
Host
Host
Host
Host
LE
Maxim Integrated
20
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相关代理商/技术参数 |
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| MAX71020AEUI+ | 功能描述:电信线路管理 IC Single-Chip AFE Electricity Meter RoHS:否 制造商:STMicroelectronics 产品:PHY 接口类型:UART 电源电压-最大:18 V 电源电压-最小:8 V 电源电流:30 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VFQFPN-48 封装:Tray |
| MAX71020AEUI+R | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Single-Chip Electricity Meter AFE |
| MAX710C/D | 功能描述:直流/直流开关转换器 3.3V/5V or Adjustable Step-Up Step-Down DC-DC Converters RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX710C/D DIE | 制造商:Maxim Integrated Products 功能描述: |
| MAX710ESE | 功能描述:直流/直流开关转换器 3.3/5V or Adjustable Step-Up Step-Down RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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