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参数资料
型号： 71M6543F-IGT/F
厂商： MAXIM INTEGRATED PRODUCTS INC
元件分类： 模拟信号调理
英文描述： SPECIALTY ANALOG CIRCUIT, PQFP100
封装： LEAD FREE, LQFP-100
文件页数： 35/157页
文件大小： 2178K
代理商： 71M6543F-IGT/F
71M6543F/H and 71M6543G/GH Data Sheet
v1.2
2008–2011 Teridian Semiconductor Corporation
13
The 71M6543 AFE can also be directly interfaced to Current Transformers (CTs), as seen in Figure 3. In
this case, all voltage and current channels are multiplexed into a single second-order sigma-delta ADC in
the 71M6543 and the 71M6xx3 remote isolated sensors are not used. The fourth CT and the
measurement of Neutral current via the IADC0-IADC1 current channel are optional.
See Figure 32 for the meter wiring configuration corresponding to Figure 3.
Σ ADC
CONVERTER
VREF
MUX
VREF
VADC
22
FIR
IADC4
VADC9 (VB)
IADC2
VADC8 (VA)
IADC3
IADC5
71M6543
CE RAM
IB
CT
IA
CT
IADC6
IADC7
IC
CT
IADC0
IADC1
IN*
CT
VADC10 (VC)
9/17/2010
*IN = Neutral Current
Figure 3. AFE Block Diagram (Four CTs)
2.2.1
Signal Input Pins
The 71M6543 features eleven ADC input pins.
IADC0 through IADC7 are intended for use as current sensor inputs. These eight current sensor inputs can
be configured as eight single-ended inputs, or can be paired to form four differential inputs. For best
performance, it is recommended to configure the current sensor inputs as differential inputs (i.e., IADC0-
IADC1, IADC2-IADC3, IADC4-IADC5 and IADC6-IADC7). The first differential input (IADC0-IADC1)
features a pre-amplifier with a selectable gain of 1 or 8, and is intended for direct connection to a shunt
resistor sensor, and can also be used with a Current Transformer (CT). The three remaining differential
pairs (i.e., IADC2-IADC3, IADC4-IADC5 and IADC6-IADC7) may be used with CTs, or may be enabled to
interface to a remote 71M6xx3 isolated current sensor providing isolation for a shunt resistor sensor using a
low cost pulse transformer.
The remaining three inputs VADC8 (VA), VADC9 (VB) and VADC10 (VC) are single-ended, and are
intended for sensing each of the phase voltages in a polyphase meter application. These three single-ended
inputs are referenced to the V3P3A pin.
All ADC 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 of the CT. Meanwhile, line voltages are
sensed through resistive voltage dividers. The VADC8 (VA), VADC9 (VB) and VADC10 (VC) pins are
single-ended and their common return is the V3P3A pin. See Figure 27, Figure 28, Figure 29 and Figure
30 for detailed connections for each type of sensor. Also refer to the 71M6543 Demonstration Board
schematic and bill of materials for typical component values used in these and other circuits.
相关PDF资料
PDF描述
71M6543H-IGTR/F SPECIALTY ANALOG CIRCUIT, PQFP100
71M6543F-IGTR/F SPECIALTY ANALOG CIRCUIT, PQFP100
71M6543H-IGT/F SPECIALTY ANALOG CIRCUIT, PQFP100
71M6543G-IGTR/F SPECIALTY ANALOG CIRCUIT, PQFP100
71M6543GH-IGTR/F SPECIALTY ANALOG CIRCUIT, PQFP100
相关代理商/技术参数
参数描述
71M6543F-IGTR/F 功能描述:计量片上系统 - SoC Precision Energy Meter IC RoHS:否 制造商:Maxim Integrated 核心:80515 MPU 处理器系列:71M6511 类型:Metering SoC 最大时钟频率:70 Hz 程序存储器大小:64 KB 数据 RAM 大小:7 KB 接口类型:UART 可编程输入/输出端数量:12 片上 ADC: 安装风格:SMD/SMT 封装 / 箱体:LQFP-64 封装:Reel
71M6543FT-IGT/F 制造商:Maxim Integrated Products 功能描述:ENERGY METER ICS - Rail/Tube
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71M6543G 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Selectable Gain of 1 or 8 for One Current Energy Meter ICs Metrology Compensation
71M6543GH 制造商:未知厂家 制造商全称:未知厂家 功能描述:电表IC
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