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参数资料
| 型号： | 78M6612SP-EVM-1 |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/46页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD 78M6612 |
| 标准包装： | 1 |
| 系列： | * |
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78M6612 Data Sheet
DS_6612_001
1.2
Analog Front End (AFE)
The AFE functions as a data acquisition system, controlled by the MPU. It consists of an input
multiplexer, a delta-sigma A/D converter, and a voltage reference. The main signals (IA, VA, IB, VB) are
sampled and the ADC counts obtained are stored in CE DRAM where they can be accessed by the CE
and, if necessary, by the MPU.
VREF
IA
VA
IB
VB
VBAT
MUX
VBIAS
VBIAS
V3P3A
-
?Σ ADC
CONVERTER
+
ADC_E
FIR
TEMP
MUX
MUX
CTRL
EQU
MUX_ALT
CHOP_E
MUX_DIV
VREF
VREF_CAL
VREF_DIS
CROSS
CK32
FIR_DONE
FIR_START
VREF
4.9MHz
FIR_LEN
Figure 2: AFE Block Diagram
1.2.1
Input Multiplexer
The input multiplexer supports up to four input signals that are applied to pins IA, VA, IB, and VB of the
device. Additionally, using the alternate multiplexer selection, it has the ability to select temperature and
the battery voltage. The multiplexer can be operated in two modes:
?
?
During a normal multiplexer cycle, the signals from the IA, IB, VA, and VB pins are selected.
During the alternate multiplexer cycle, the temperature signal (TEMP) and the battery monitor are
selected, along with the signal sources shown in Table 1 . To prevent unnecessary drainage on the
battery, the battery monitor is enabled only with the BME bit (0x2020[6]) in the I/O RAM.
The alternate multiplexer cycles are usually performed infrequently (e.g. every second or so) by the MPU.
In order to prevent disruption of the voltage tracking PLL and voltage allpass networks, VA is not
replaced in the ALT mux selections. Table 1 details the regular and alternative multiplexer sequences.
Missing samples due to an ALT multiplexer sequence are filled in by the CE.
Table 1: Inputs Selected in Regular and Alternate Multiplexer Cycles
Regular MUX Sequence
Mux State
ALT MUX Sequence
Mux State
EQU
2
0
IA
1
VA
2
IB
3
VB
0
TEMP
1
VA
2
VBAT
3
VB
In a typical application, IA and IB are connected to current sensors that sense the current on each branch
of the line voltage. VA and VB are typically connected to voltage sensors through resistor dividers. The
multiplexer control circuit is clocked by CK32, the 32.768 kHz clock from the PLL block, and launches with
each new pass of the CE program. The duration of each multiplexer state depends on the number of
ADC samples processed by the FIR.
8
Rev 2
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相关代理商/技术参数 |
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|---|---|
| 78M6613 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Four Sensor Inputs—V3P3A Referenced 32KB Flash with Security |
| 78M6613_12 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Single-Phase AC Power Measurement IC |
| 78M6613-EVM | 制造商:Maxim Integrated Products 功能描述:78M6613 EVAL BOARD - Boxed Product (Development Kits) |
| 78M6613-EVM-1 | 功能描述:开发板和工具包 - 8051 78M6613 Eval Kit RoHS:否 制造商:Silicon Labs 产品:Development Kits 工具用于评估:C8051F960, Si7005 核心: 接口类型:USB 工作电源电压: |
| 78M6613-IM | 制造商:TERIDIAN 制造商全称:TERIDIAN 功能描述:Single-Phase AC Power Measurement IC |
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