参数资料
| 型号： | EVAL-ADE7878EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 39/100页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR ADE7878 |
| 标准包装： | 1 |
| 主要目的： | 电源管理，电度表/功率表 |
| 嵌入式： | 是，DSP |
| 已用 IC / 零件： | ADE7878 |
| 次要属性： | USB 接口 |
| 已供物品： | 板 |
| 其它名称： | Q4472972 Q4684026 Q5015773 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页当前第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页第83页第84页第85页第86页第87页第88页第89页第90页第91页第92页第93页第94页第95页第96页第97页第98页第99页第100页
Data Sheet
ADE7854/ADE7858/ADE7868/ADE7878
5.
The STATUS1 register is written with Bit 18 (OV) set to 1.
ADC MAX = 5,928,256, the ADC output when the input is at full
I SUM ( t ) =
× I FS
In this moment, Bit OV is erased and also all Bits[11:9]
(OVPHASE[2:0]) of the PHSTATUS register.
In case of an overcurrent event, if Bit 17 (OI) in the MASK1
register is set, the IRQ1 interrupt pin is driven low. Immediately,
Bit 17 (OI) in the STATUS1 register and one of Bits[5:3]
(OIPHASE[2:0]) in the PHSTATUS register, which identify
the phase that generated the interrupt, are set. To find the
phase that triggered the interrupt, the PHSTATUS register
is read immediately after reading the STATUS1 register. Next,
Status Bit 17 (OI) in the STATUS1 register and Bits[5:3]
(OIPHASE[2:0]) in the PHSTATUS register are cleared and the
IRQ1 pin is set to high by writing to the STATUS1 register with
the status bit set to 1. The process is similar with overvoltage
detection.
Overvoltage and Overcurrent Level Set
The content of the overvoltage (OVLVL), and overcurrent,
(OILVL) 24-bit unsigned registers is compared to the absolute
value of the voltage and current channels. The maximum value of
these registers is the maximum value of the HPF outputs:
+5,928,256 (0x5A7540). When the OVLVL or OILVL register is
equal to this value, the overvoltage or overcurrent conditions
are never detected. Writing 0x0 to these registers signifies the
overvoltage or overcurrent conditions are continuously detected,
and the corresponding interrupts are permanently triggered.
As stated in the Current Waveform Gain Registers section, the
serial ports of the ADE78xx work on 32-, 16-, or 8-bit words.
Similar to the register presented in Figure 36, OILVL and
OVLVL registers are accessed as 32-bit registers with the eight
MSBs padded with 0s.
Neutral current mismatch is available in the ADE7868 and
ADE7878 only. In 3-phase systems, the neutral current is equal
to the algebraic sum of the phase currents
I N ( t ) = I A ( t ) + I B ( t ) + I C ( t )
If there is a mismatch between these two quantities, then a
tamper situation may have occurred in the system.
The ADE7868 / ADE7878 compute the sum of the phase
currents adding the content of the IAWV, IBWV, and ICWV
registers, and storing the result into the ISUM 28-bit signed
register: I SUM (t) = I A (t) + I B (t) + I C (t). ISUM is computed every
125 μs (8 kHz frequency), the rate at which the current samples
are available, and Bit 17 (DREADY) in the STATUS0 register is
used to signal when the ISUM register can be read. See the
To recover I SUM (t) value from the ISUM register, use the
following expression:
ISUM[27:0]
ADC MAX
where:
scale.
I FS is the full-scale ADC phase current.
The ADE7868 / ADE7878 compute the difference between the
absolute values of ISUM and the neutral current from the
INWV register, take its absolute value and compare it against
the ISUMLVL threshold. If ISUM ? INWV ≤ ISUMLVL ,
then it is assumed that the neutral current is equal to the sum
of the phase currents, and the system functions correctly. If
ISUM ? INWV > ISUMLVL , then a tamper situation may
have occurred, and Bit 20 (MISMTCH) in the STATUS1 register
is set to 1. An interrupt attached to the flag can be enabled by
setting Bit 20 (MISMTCH) in the MASK1 register. If enabled,
the IRQ1 pin is set low when Status Bit MISMTCH is set to 1.
The status bit is cleared and the IRQ1 pin is set back to high by
writing to the STATUS1 register with Bit 20 (MISMTCH) set to 1.
If ISUM ? INWV ≤ ISUMLVL , then MISMTCH = 0
If ISUM ? INWV > ISUMLVL , then MISMTCH = 1
ISUMLVL, the positive threshold used in the process, is a 24-bit
signed register. Because it is used in a comparison with an
absolute value, always set ISUMLVL as a positive number,
somewhere between 0x00000 and 0x7FFFFF. ISUMLVL uses
the same scale of the current ADCs outputs, so writing
+5,928,256 (0x5A7540) to the ISUMLVL register puts the
ADC section for details. Writing 0x000000, the default value, or
a negative value, signifies the MISMTCH event is always triggered.
The right value for the application should be written into the
ISUMLVL register after power-up or after a hardware/software
reset to avoid continuously triggering MISMTCH events.
As stated in the Current Waveform Gain Registers section, the
serial ports of the ADE7868 / ADE7878 work on 32-, 16-, or 8-bit
ISUM, the 28-bit signed register, is accessed as a 32-bit register
with the four most significant bits padded with 0s.
31 28 27 0
0000 28-BIT SIGNED NUMBER
BIT 27 IS A SIGN BIT
Figure 53. The ISUM[27:0] Register is Transmitted As a 32-Bit Word
Similar to the registers presented in Figure 35, the ISUMLVL
register is accessed as a 32-bit register with four most significant
bits padded with 0s and sign extended to 28 bits.
PHASE COMPENSATION
ADC sections, the datapath for both current and voltages is the
same. The phase error between current and voltage signals
ADE7878 must work with transducers that may have inherent
Rev. H | Page 39 of 100
相关PDF资料 |
PDF描述 |
|---|---|
| EVAL-ADE7880EBZ | BOARD EVAL FOR ADE7880 |
| EVAL-ADE7953EBZ | BOARD EVAL FOR ADE7953 |
| EVAL-ADF4002EBZ1 | BOARD EVAL FOR ADF4002 |
| EVAL-ADG788EBZ | BOARD EVALUATION FOR ADG788 |
| EVAL-ADM1021AEB | BOARD EVAL FOR ADM1021 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| EVAL-ADE7880EBZ | 功能描述:BOARD EVAL FOR ADE7880 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:* 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- 主要目的:电源管理，电池充电器 嵌入式:否 已用 IC / 零件:MAX8903A 主要属性:1 芯锂离子电池 次要属性:状态 LED 已供物品:板 |
| EVAL-ADE7880EBZ | 制造商:Analog Devices 功能描述:ADE7880, ENERGY METER, 3 PH, SPI, I2C, E |
| EVAL-ADE7913EBZ | 制造商:AD 制造商全称:Analog Devices 功能描述:3-Channel, Isolated, Sigma-Delta ADC with SPI |
| EVAL-ADE7953EBZ | 功能描述:BOARD EVAL FOR ADE7953 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:PSoC® 主要目的:电源管理，热管理 嵌入式:- 已用 IC / 零件:- 主要属性:- 次要属性:- 已供物品:板，CD，电源 |
| EVAL-ADF4001EBZ2 | 制造商:Analog Devices 功能描述:Evaluation Board For Pll Frequency Synthesizer 制造商:Analog Devices 功能描述:ADF4001 PLL SYNTHESIZER EVAL BOARD |
发布紧急采购，3分钟左右您将得到回复。