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参数资料
| 型号： | MAX71020AEUI+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 28/35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
Table 9. CE EQU Equations and Element Input Mapping
EQU
WATT AND VAR FORMULA
(WSUM/VARSUM)
INPUTS USED FOR ENERGY/CURRENT CALCULATION
W0SUM/ W1SUM/ I0SQ I1SQ
VAR0SUM VAR1SUM SUM SUM
0
1*
2*
VA IA – 1 element, 2W 1 φ
VA x (IA-IB)/2 – 1 element, 3W 1 φ
VA x IA + VB x IB– 2 element, 3W 1 φ
VA x IA
VA x (IA-IB)/2
VA x IA
VA x IB
—
VB x IB
IA
IA-IB
IA
—
IB
IB
* Not supported by standard CE codes.
Table 10. CE Raw Data Access Locations
PIN REGISTER
and current sensors used in an actual meter. The LSB
values used in this document relate digital quantities at the
CE or MPU interface to external meter input quantities. For
IA
VA
IB
VB
0x100
0x101
0x102
0x103
example, if a SAG threshold of 80V RMS is desired at the
meter input, the digital value that should be programmed
into SAG_THR (register 0x024) would be 80V RMS x
SQRT(2)/SAG_THR LSB , where SAG_THR LSB is the LSB
value in the description of SAG_THR (see Table 12 ).
Environment
Constants
Constants used in the CE Data Memory tables are:
U f 0 is the fundamental frequency of the mains phases.
U I MAX is the external RMS current corresponding to the
maximum allowed voltage on the current inputs. For
the IB input, this is 250mV peak (176.8mV RMS ). In the
MAX71020, IA normally has a preamplifier enabled
on the IA inputs, so I MAX needs to be adjusted to
27.78mV peak (19.64mV RMS ) for the IAP-IAN inputs.
For a 250μ? shunt resistor, I MAX becomes 78A
(19.64mV RMS /250μ? = 78.57A) for IA, and 707A
(176.8mV RMS /250μ? = 707.2A RMS ) for IB.
U V MAX is the external RMS voltage corresponding to
250mV peak at the VA and VB inputs.
U N ACC , the accumulation count for energy measure-
ments (typically 2520).
U The duration of the accumulation interval for energy
measurements is N ACC /F S = 2520/2,520.6 ≈ 1s.
U X is a gain constant of the pulse generators. Its value
is determined by PULSE_FAST and PULSE_SLOW.
U Voltage LSB (for sag threshold) = V MAX x 7.879810 - 9V.
The system constants I MAX and V MAX are used by the
host controller to convert internal digital quantities (as
used by the CE) to external, real-world metering quantities.
Their values are determined by the scaling of the voltage
Maxim Integrated
Default settings are assumed to be V MAX = 600V, I MAX =
707A, and kH = 1.
CE Calculations
In Table 9 , the Load Engine selects the desired equation
by writing to the METER_CFG register.
CE Front-End Data (Raw Data)
Access to the raw data provided by the AFE is possible
by reading registers 0x100–0x003 as shown in Table 10 .
CE Status and Control
The CE Status Word, CESTATUS, is useful for generating
early warnings to the host controller ( Table 7 ). It con-
tains sag warnings for phase A and B, as well as F0, the
derived clock operating at the line frequency. The host
controller can read the CE status word at every CE_BUSY
interrupt.
CESTATUS provides information about the status of volt-
age and input AC signal frequency, which are useful for
generating an early power-fail warning to initiate neces-
sary data storage. CESTATUS represents the status flags
for the preceding CE code pass (CE_BUSY interrupt).
The significance of the bits in CESTATUS is shown in
Table 7 . The CE is initialized by the host controller using
CECONFIG ( Table 7 ). This register contains the SAG_CNT,
PULSE_SLOW, and PULSE_FAST fields. The CECONFIG
bit definitions are given in Table 7 . When the SAG_INT
bit (register 0x020[20]) is set to 1, a sag event generates
28
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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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