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参数资料
| 型号： | ADE7518ASTZF8-RL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 51/128页 |
| 文件大小： | 0K |
| 描述： | IC ENERGY METER MCU 8K 64LQFP |
| 产品变化通告： | Product Discontinuance 27/Oct/2011 |
| 标准包装： | 1,500 |
| 输入阻抗： | * |
| 测量误差： | * |
| 电压 - 高输入/输出： | * |
| 电压 - 低输入/输出： | * |
| 电流 - 电源： | * |
| 电源电压： | * |
| 测量仪表类型： | * |
| 工作温度： | * |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 64-LQFP |
| 供应商设备封装： | 64-LQFP（10x10） |
| 包装： | 带卷 (TR) |
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ADE7518
Figure 53 shows this energy accumulation for full-scale signals
(sinusoidal) on the analog inputs. The three displayed curves
When WDIV is set to a value other than 0, the integration time
varies, as shown in Equation 15.
illustrate the minimum period of time it takes the energy register
to roll over when the active power gain register contents are
0x7FF, 0x000, and 0x800. The watt gain register is used to carry
Time = Time WDIV = 0 × WDIV
Active Energy Accumulation Modes
(15)
out power calibration in the ADE7518. As shown, the fastest
integration time occurs when the watt gain register is set to
maximum full scale, that is, 0x7FF.
WATTHR[23:0]
Watt-Signed Accumulation Mode
The ADE7518 active energy default accumulation mode is a
watt-signed accumulation based on the active power information.
Watt Positive-Only Accumulation Mode
0x7F,FFFF
0x3F,FFFF
WGAIN = 0x7FF
WGAIN = 0x000
WGAIN = 0x800
The ADE7518 is placed in watt positive-only accumulation mode
by setting the POAM bit in the ACCMODE register (0x0F). In
this mode, the energy accumulation is only done for positive
power, ignoring any occurrence of negative power above or
below the no load threshold (see Figure 54). The CF pulse also
0x00,0000
3.41
6.82
10.2
13.7
TIME (Minutes)
reflects this accumulation method when in this mode. The
default setting for this mode is off. Detection of the transitions
0x40,0000
0x80,0000
Figure 53. Energy Register Rollover Time for Full-Scale Power
(Minimum and Maximum Power Gain)
Note that the energy register contents roll over to full-scale
negative (0x800000) and continue to increase in value when the
power or energy flow is positive (see Figure 53). Conversely, if
the power is negative, the energy register underflows to full-
scale positive (0x7FFFFF) and continues to decrease in value.
By using the interrupt enable register, the ADE7518 can be
configured to issue an ADE interrupt to the 8052 core when the
active energy register is half full (positive or negative) or when
an overflow or underflow occurs.
in the direction of power flow and detection of no load threshold
are active in this mode.
ACTIVE ENERGY
NO LOAD
THRESHOLD
ACTIVE POWER
NO LOAD
THRESHOLD
Integration Time Under Steady Load: Active Energy
APSIGN FLAG
POS
NEG
POS
As mentioned previously, the discrete time sample period (T)
for the accumulation register is 1.22 μs (5/MCLK). With full-
scale sinusoidal signals on the analog inputs and the WGAIN
register set to 0x000, the average word value from each LPF2
is 0xCCCCD (see Figure 49). The maximum positive value
that can be stored in the internal 49-bit register is 2 48 (or
0xFFFF,FFFF,FFFF) before it overflows. The integration time
under these conditions when WDIV = 0 is calculated in the
following equation:
INTERRUPT STATUS REGISTERS
Figure 54. Energy Accumulation in Positive-Only Accumulation Mode
Watt-Absolute Accumulation Mode
The ADE7518 is placed in watt-absolute accumulation mode by
setting the ABSAM bit in the ACCMODE register (0x0F). In this
mode, the energy accumulation is done using the absolute
active power, ignoring any occurrence of power below the no
load threshold (see Figure 55). The CF pulse also reflects this
Time =
0 xFFFF, FFFF, FFFF
0 xCCCCD
× 1 . 22 μs = 409 . 6 sec = 6 . 82 min (14)
accumulation method when in this mode. The default setting
for this mode is off. Detection of the transitions in the direction
of power flow and detection of a no load threshold are active in
this mode.
Rev. 0 | Page 51 of 128
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