- 您现在的位置：买卖IC网 > Sheet目录307 > ADE7569ASTZF16 (Analog Devices Inc)IC ENERGY METER MCU 16K 64LQFP
ADE7566/ADE7569
POWER QUALITY MEASUREMENTS
Zero-Crossing Detection
Each ADE7566/ADE7569 has a zero-crossing detection circuit
on the voltage channel. This zero crossing is used to produce an
external zero-crossing signal (ZX) and is used in calibration mode.
The zero-crossing is generated by default from the output of
LPF1. This filter has a low cut-off frequency and is intended for
50 Hz and 60 Hz systems. If needed, this filter can be disabled
to allow a higher frequency signal to be detected or to limit the
group delay of the detection. If the voltage input fundamental
frequency is below 60 Hz, and a time delay in ZX detection is
acceptable, it is recommended to enable LPF1. Enabling LPF1
limits the variability in the ZX detection by eliminating the high
frequency components.
Figure 42 shows how the zero-crossing signal is generated.
Preliminary Technical Data
this register is 0xFFF. If the internal register decrements to 0
before a zero crossing is detected in the Interrupt Status
Register 3 SFR (MIRQSTH, 0xDE), and the ZXTO bit in the
Interrupt Enable Register 3 SFR (MIRQENH, 0xDB) is set, the
8052 core has a pending ADE interrupt.
The ADE interrupt stays active until the ZXTO status bit is
cleared (see the Energy Measurement Interrupts section).
The ZXOUT register (Address 0x11) can be written or read by
the user (see the Energy Measurement Register List section).
The resolution of the register is 160/MCLK sec per LSB. Thus,
the maximum delay for an interrupt is 0.16 sec (128/MCLK × 2 12 )
when MCLK = 4.096 MHz.
Figure 43 shows the mechanism of the zero-crossing timeout
detection when the line voltage stays at a fixed dc level for more
than CLKIN/160 × ZXTOUT sec.
REFERENCE
V2
V P
×1, ×2, ×4,
×8, ×16
{GAIN [7:5]}
PGA2
ADC 2
HPF
12-BIT INTERNAL
REGISTER VALUE
ZXTOUT
V N
LPF1
f –3dB = 63.7Hz
ZERO
CROSS
ZX
VOLTAGE
CHANNEL
MODE1[6]
1.0
0.73
43.24° @ 60Hz
ZX
ZXTO
FLAG
BIT
Figure 43. Zero-Crossing Timeout Detection
Period or Frequency Measurements
V2
LPF1
The ADE7566/ADE7569 provide the period or frequency
measurement of the line. The period or frequency measurement
Figure 42. Zero-Crossing Detection on Voltage Channel
The zero-crossing signal ZX is generated from the output of
LPF1 (bypassed or not). LPF1 has a single pole at 63.7 Hz (at
MCLK = 4.096 MHz). As a result, there is a phase lag between
the analog input signal V2 and the output of LPF1. The phase
lag response of LPF1 results in a time delay of approximately
2 ms (@ 60 Hz) between the zero crossing on the analog inputs
of the voltage channel and ZX detection.
The zero-crossing detection also drives the ZX flag in the
Interrupt Status Register 3 SFR (MIRQSTH, 0xDE). If the ZX
bit in the Interrupt Enable Register 3 SFR (MIRQENH, 0xDB)
is set, the 8052 core has a pending ADE interrupt.
The ADE interrupt stays active until the ZX status bit is cleared
(see the Energy Measurement Interrupts section).
Zero-Crossing Timeout
The zero-crossing detection also has an associated timeout
register, ZXTOUT. This unsigned, 12-bit register is decremented
(1 LSB) every 160/MCLK sec. The register is reset to its user
is selected by clearing or setting FREQSEL bit in the MODE2
Register (0x0C). The period/frequency register, PER_FREQ
Register (0x0A), is an unsigned 16-bit register that is updated
every period. If LPF1 is enabled, a settling time of 1.8 sec is
associated with this filter before the measurement is stable.
When the period measurement is selected, the measurement
has a 2.44 μs/LSB (MCLK/10) when MCLK = 4.096 MHz,
which represents 0.014% when the line frequency is 60 Hz.
When the line frequency is 60 Hz, the value of the period
register is approximately 0d6827. The length of the register
enables the measurement of line frequencies as low as 12.5 Hz.
The period register is stable at ±1 LSB when the line is
established and the measurement does not change.
When the frequency measurement is selected, the measurement
has a 0.0625 Hz/LSB resolution when MCLK = 4.096 MHz,
which represents 0.104% when the line frequency is 60 Hz.
When the line frequency is 60 Hz, the value of the frequency
register is 0d960. The frequency register is stable at ±4 LSB when
the line is established and the measurement does not change.
programmed, full-scale value every time a zero crossing is
detected on the voltage channel. The default power-on value in
Rev. PrA | Page 46 of 136
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
ADE7752BARWZ-RL
IC ENERGY METERING 3PHASE 24SOIC
ADE7755ARSZ
IC ENERGY METERING 1PHASE 24SSOP
ADE7757ARNZRL
IC ENERGY METERING 1PHASE 16SOIC
ADE7758ARWZRL
IC ENERGY METERING 3PHASE 24SOIC
ADE7761AARSZ-RL
IC ENERGY METERING 1PHASE 20SSOP
ADE7761BARSZ-RL
IC ENERGY METERING 1PHASE 20SSOP
ADE7768ARZ-RL
IC ENERGY METERING 1PHASE 16SOIC
ADE7769ARZ-RL
IC ENERGY METERING 1PHASE 16SOIC
相关代理商/技术参数
ADE7569ASTZF162
制造商:AD 制造商全称:Analog Devices 功能描述:Single-Phase Energy Measurement IC with 8052 MCU, RTC, and LCD Driver
ADE7569ASTZF16-RL
功能描述:IC ENERGY METER 1PHASE 64-LQFP 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:*
ADE7569ASTZF16-RL2
制造商:AD 制造商全称:Analog Devices 功能描述:Single-Phase Energy Measurement IC with 8052 MCU, RTC, and LCD Driver
ADE7751
制造商:AD 制造商全称:Analog Devices 功能描述:Energy Metering IC with On-Chip Fault Detection
ADE7751AAN-REF
制造商:AD 制造商全称:Analog Devices 功能描述:Energy Metering IC with On-Chip Fault Detection
ADE7751AN
制造商:Analog Devices 功能描述:Energy Measurement 24-Pin PDIP 制造商:Analog Devices 功能描述:ENERGY MEASUREMENT 24PDIP - Bulk 制造商:Rochester Electronics LLC 功能描述:PRODUCT TO FREQUENCY CONVERTER I.C. - Bulk
ADE7751ARS
制造商:Rochester Electronics LLC 功能描述:PRODUCT TO FREQUENCY CONVERTER I.C. - Bulk 制造商:Analog Devices 功能描述:IC ENERGY METER
ADE7751ARSRL
制造商:Analog Devices 功能描述:Energy Measurement 24-Pin SSOP T/R 制造商:Analog Devices 功能描述:IC ENERGY METER