- 您现在的位置：买卖IC网 > PDF目录223307 > ADE7878ACPZ (ANALOG DEVICES INC) Poly Phase Multifunction Energy Metering IC With Total And Fundamental Powers, No Of Pins: 40, Temperature Range: Ind PDF资料下载
参数资料
| 型号： | ADE7878ACPZ |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 模拟信号调理 |
| 英文描述： | Poly Phase Multifunction Energy Metering IC With Total And Fundamental Powers, No Of Pins: 40, Temperature Range: Ind |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, QCC40 |
| 封装： | 6 X 6 MM, ROHS COMPLIANT, MO-220WJJD, LFCSP-40 |
| 文件页数： | 72/96页 |
| 文件大小： | 1096K |
| 代理商： | ADE7878ACPZ |
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页当前第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
ADE7854/ADE7858/ADE7868/ADE7878
Rev. E | Page 74 of 96
Table 27. The Read-Only RMS Registers May Show the Wrong Value [er003, Version = 2 Silicon]
Background
The read-only rms registers (AVRMS, BVRMS, CVRMS, AIRMS, BIRMS, CIRMS, and NIRMS) can be read without restrictions at
any time.
Issue
The fixed function DSP of ADE7854, ADE7858, ADE7868, and ADE7878 computes all the powers and rms values in a loop
with a period of 125 μs (8 kHz frequency). If two rms registers are accessed (read) consecutively, the value of the second
register may be corrupted. Consequently, the apparent power computed during that 125 μs cycle is also corrupted. The
rms calculation recovers in the next 125 μs cycle, and all the rms and apparent power values compute correctly.
The issue appears independent of the communication type, SPI or I2C, when the time between the start of two
consecutive rms readings is lower than 265 μs. The issue affects only the rms registers; all of the other registers of
ADE7854, ADE7858, ADE7868, and ADE7878 can be accessed without any restrictions.
Workaround
The rms registers can be read one at a time with at least 265 μs between the start of the readings. DREADY interrupt at the
IRQ0 pin can be used to time one rms register reading every three consecutive DREADY interrupts. This ensures 375 μs
between the start of the rms readings.
Alternatively, the rms registers can be read interleaved with readings of other registers that are not affected by this
restriction as long as the time between the start of two consecutive rms register readings is 265 μs.
Related Issues
None.
Table 28. To Obtain Best Accuracy Performance, Internal Setting Must Be Changed [er004, Version = 2 Silicon]
Background
Internal default settings provide best accuracy performance for ADE7854, ADE7858, ADE7868, and ADE7878.
Issue
It was found that if a different setting is used, the accuracy performance can be improved.
Workaround
To enable a new setting for this internal register, execute two consecutive 8-bit register write operations:
The first write operation: 0xAD is written to Address 0xE7FE.
The second write operation: 0x01 is written to Address 0xE7E2.
The write operations must be executed consecutively without any other read/write operation in between. As a
verification that the value was captured correctly, a simple 8-bit read of Address 0xE7E2 should show the 0x01 value.
Related Issues
None.
Table 29. Values Written to the SAGLVL and ZXTOUT Registers May Not Be Immediately Used by ADE7854, ADE7858,
ADE7868, and ADE7878 [er005, Version = 4 Silicon]
Background
Usually, the SAGLVL and ZXTOUT registers initialize immediately after power-up or after a hardware/software reset. After
the run register is set to 1, the phase voltage sag detector (for SAGLVL), and the zero-crossing timeout circuit (for ZXTOUT)
use these values immediately.
Issue
After the SAGLVL register is initialized with a new value after power-up or a hardware or software reset, the new value
may be delayed and not available for immediate use by the phase voltage sag detector. However, it is used by the
detector after at least one phase voltage rises above 10% of the full-scale input at the phase voltage ADCs.
After the ZXTOUT register is initialized with a new value after power-up or a hardware or software reset, the new value
may be delayed and not available for immediate use by the zero-crossing timeout circuit. However, the circuit does use
the new value after at least one phase voltage rises above 10% of the full-scale input at the phase voltage ADCs.
Workaround
Usually, at least one of the phase voltages is greater than 10% of full scale after power-up or after a hardware/software
reset. If this cannot be guaranteed, then the SAGLVL and ZXTOUT registers should be written eight consecutive times to
reduce the probability of not being considered immediately by the phase voltage sag detector and zero-crossing timeout
circuit below 0.2 ppm.
Related Issues
None.
SECTION 1. ADE7854/ADE7858/ADE7868/ADE7878 FUNCTIONALITY ISSUES
Reference
Number
Description
Status
er001
Offset rms registers cannot be set to negative values.
Identified
er002
Values written to the CF1DEN, CF2DEN, CF2DEN, SAGLVL, and ZXTOUT registers may not be immediately
used by ADE7854, ADE7858, ADE7868, and ADE7878.
Identified
er003
The read-only rms registers may show the wrong value.
Identified
er004
To obtain best accuracy performance, internal setting must be changed.
Identified
er005
Values written to the SAGLVL and ZXTOUT registers may not be immediately used by ADE7854, ADE7858,
ADE7868, and ADE7878.
Identified
This completes the Silicon Anomaly section.
相关PDF资料 |
PDF描述 |
|---|---|
| ADE7878ACPZ-RL | Poly Phase Multifunction Energy Metering IC With Total And Fundamental Powers, No Of Pins: 40, Temperature Range: Ind |
| ADG529FTQ | 4-CHANNEL, DIFFERENTIAL MULTIPLEXER, CDIP18 |
| ADJ24006 | POWER/SIGNAL RELAY, SPST, LATCHED, 0.042A (COIL), 6VDC (COIL), 250mW (COIL), THROUGH HOLE-STRAIGHT MOUNT |
| ADJ24012 | POWER/SIGNAL RELAY, SPST, LATCHED, 0.021A (COIL), 12VDC (COIL), 250mW (COIL), THROUGH HOLE-STRAIGHT MOUNT |
| ADJ24024 | POWER/SIGNAL RELAY, SPST, LATCHED, 0.01A (COIL), 24VDC (COIL), 250mW (COIL), THROUGH HOLE-STRAIGHT MOUNT |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ADE7878ACPZ | 制造商:Analog Devices 功能描述:IC MULTIFUNCTION ENERGY METERING LFCSP40 |
| ADE7878ACPZ-RL | 功能描述:IC ENERGY METERING 3PH 40LFCSP RoHS:是 类别:集成电路 (IC) >> PMIC - 能量测量 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:* |
| ADE7878XCPZ | 制造商:Analog Devices 功能描述:POLY PHASE MULTIFUNCTION ENERGY METERING IC WITH TOTAL - Bulk |
| ADE7880 | 制造商:Analog Devices 功能描述:BOARD EVAL ENERGY METER ADE |
| ADE7880ACPZ | 功能描述:IC ENERGY METERING 3PH 40LFCSP RoHS:是 类别:集成电路 (IC) >> PMIC - 能量测量 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:* |
发布紧急采购，3分钟左右您将得到回复。