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MAX71020
Single-Chip Electricity Meter AFE
one second. Additionally, the hardware does not permit
output values to fold back upon overflow.
WSUM_X (register 0x084) and VARSUM_X (register
0x088) are the signed sum of Phase-A and Phase-B
Wh or VARh values according to the metering equation
implemented by the CE code. WxSUM_X (x = 0 or 1,
registers 0x085 and 0x086) is the watt-hour value accu-
mulated for phase x in the last accumulation interval and
can be computed based on the specified LSB value.
Instantaneous Energy Measurement Variables
I_SQSUM_X and V_SQSUM (see Table 14 ) are the sum
of the squared current and voltage samples acquired
during the last accumulation interval.
The RMS values can be computed by the host controller
from the squared c urrent    and voltage samples as follows:
Other transfer variables include those available for
frequency and those reflecting the count of the zero-
crossings of the mains voltage. These transfer variables
are listed in Table 15 .
MAINEDGE_X (register 0x083) reflects the number of
half-cycles accounted for in the last accumulated interval
for the voltage signal. MAINEDGE_X is useful for imple-
menting a real-time clock based on the input AC signal.
Pulse Generation
Table 16 describes the CE pulse generation parameters.
The combination of the CECONFIG:PULSE_SLOW and
CECONFIG:PULSE_FAST bits (register 0x020[0:1]) con-
trols the speed of the pulse generator. The default zero
values of these configuration bits maintain the original
pulse rate given by the Kh equation, described below.
üüüüüüüüü × ×
üüüüüüüüü × ×
Other
I RMS =
V RMS =
I
N ACC
V
N ACC
WRATE (register 0x021) controls the number of pulses
that are generated per measured Wh and VARh. The
lower WRATE is, the slower the pulse rate for the mea-
sured energy quantity; or conversely, the greater the
measured energy per pulse. By default, the pulse gener-
ators take their input from the W0SUM_X (register 0x085)
and VAR0SUM_X (register 0x089) result registers.
Table 14. CE Energy Measurement Variables
CE
ADDRESS
0x8C
0x8D
0x90
0x91 ?
NAME
I0SQSUM_X
I1SQSUM_X
V0SQSUM_X
V1SQSUM_X
DESCRIPTION
The sum of squared current samples from each element.
LSB I = 6.08040 x 10 -13 IMAX 2 A 2 h
When EQU = 1, I0SQSUM_X is based on IA and IB.
The sum of squared voltage samples from each element.
LSB V = 6.08040 x 10 -13 VMAX 2 V 2 h
CONFIGURATION
Figure 8
Table 15. Other Transfer Variables
CE
ADDRESS
NAME
DESCRIPTION
0x82
FREQ_X
Fundamental frequency:
LSB ≡
2520.6Hz
2 32
≈ 0.509 × 10 -6
0x83
Maxim Integrated
MAINEDGE_X
The number of edge crossings of the selected voltage in the previous accumulation
interval. Edge crossings are either direction and are debounced.
30
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相关代理商/技术参数
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
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
MAX710ESE+ 制造商:Maxim Integrated Products 功能描述:CONVERTOR DC/DC ((NW))
MAX710ESE+T 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
MAX710ESE-T 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