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| 型号： | MAX71020AEUI+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 10/35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
Hardware Description
Hardware Overview
The MAX71020 energy meter analog front-end (AFE)
integrates all primary functional blocks required to imple-
ment a solid-state residential electricity meter. Included
on the chip are:
● An analog front-end (AFE) featuring a 22-bit second-
order sigma-delta ADC
● An independent 32-bit digital computation engine
(CE) to implement DSP functions
● A precision voltage reference (VREF)
● A temperature sensor for digital temperature
sensing and compensation
● Four I/O pins
● A zero-crossing detector with interrupt output
● Resistive shunt and current transformers
are supported
● A SPI slave for connection to a host controller
In a typical application, the 32-bit compute engine (CE)
of the MAX71020 sequentially processes the samples
from the voltage inputs on analog input pins and per-
forms calculations to measure active energy (Wh) and
reactive energy (VARh), as well as A 2 h, and V 2 h for
four-quadrant metering. These measurements are then
accessed by the host controller.
In addition to the temperature-trimmed ultra-precision
voltage reference, the on-chip digital temperature com-
pensation mechanism includes a temperature sensor
and associated controls for correction of unwanted
temperature effects on measurement, e.g., to meet the
requirements of ANSI and IEC standards.
Temperature-dependent external components such as
crystal oscillator, resistive shunts, current transformers
(CTs) and their corresponding signal conditioning circuits
can be characterized and their correction factors can be
programmed to produce electricity meters with excep-
tional accuracy over the industrial temperature range.
Communications with the host is conducted over a SPI
interface. The communications protocol between the host
and the MAX71020 provides a redundant information
transfer ensuring the correctness of commands trans-
ferred from the host to the AFE, and of data transferred
from the AFE to the host.
Maxim Integrated
In addition, the MAX71020 has one pin dedicated as an
interrupt output to the host. This pin notifies the host of
asynchronous events.
Analog Section
Signal Input Pins
The MAX71020 has four analog inputs: two single-ended
inputs for voltage measurement, and two differential
inputs for current measurement.
The IAP, IAN, IBP, and IBN pins are current sensor
inputs. The differential inputs feature preamplifiers with
a selectable gain of 1 or 9, and are intended for direct
connection to a shunt resistor sensor or a current trans-
former (CT).
The voltage inputs in the MAX71020 are single-ended,
and are intended for sensing the line voltage via resistive
dividers. These single-ended inputs are referenced to
the GNDA pin.
All analog signal input pins measure voltage. In the
case of shunt current sensors, currents are sensed as a
voltage drop in the shunt resistor sensor. In the case of
Current Transformers (CT), the current is measured as a
voltage across a burden resistor that is connected to the
secondary winding of the CT. Meanwhile, line voltages
are sensed through resistive voltage-dividers.
Some versions of the device implement a preamplifier
with a fixed gain of 8.9 to enhance performance when
using sensors with a low-amplitude output (for example,
current shunts). When using a device with the preamplifi-
er enabled, the input signal amplitude cannot be greater
than 27.78mV peak.
Input Multiplexer
The input multiplexer sequentially applies the input signals
from the analog input pins to the input of the ADC. One
complete sampling sequence is called a multiplexer frame.
The IBP-IBN differential input may be used to sense the
neutral current, and VB may be optionally used to sense
a second voltage channel.This configuration implies that
the multiplexer applies a total of four inputs to the ADC.
For this configuration, the multiplexer sequence is as
shown in Figure 2 . In this configuration IAP-IAN, IBP-IBN,
VA and VB are sampled. The physical current sensor for
the neutral current measurement and the voltage sensor
for VB may be omitted if not required.
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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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