参数资料
型号: ADE7518ASTZF8-RL
厂商: Analog Devices Inc
文件页数: 28/128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)
ADE7518
USING THE POWER SUPPLY FEATURES
In an energy meter application, the 3.3 V power supply (V DD )
is typically generated from the ac line voltage and regulated to
3.3 V by a voltage regulator IC. The preregulated dc voltage,
typically 5 V to 12 V, can be connected to V DCIN through a resis-
tor divider. A 3.6 V battery can be connected to V BAT . Figure 29
shows how the ADE7518 power supply inputs are set up in this
application.
Figure 30 shows the sequence of events that occurs if the main
power supply generated by the PSU starts to fail in the power
meter application shown in Figure 29. The SAG detection can
provide the earliest warning of a potential problem on V DD .
When a SAG event occurs, user code can be configured to back
up data and prepare for battery switchover if desired. The rela-
tive spacing of these interrupts depends on the design of the
power supply.
Figure 31 shows the sequence of events that occurs if the main
power supply starts to fail in the power meter application shown
in Figure 29, with battery switchover on low V DCIN or low V DD
enabled.
Finally, the transition between V DD and V BAT and the different
power supply modes (see the Operating Modes section) are
represented in Figure 32 and Figure 33.
(240V, 220V, 110V TYPICAL)
BCTRL 45
AC INPUT
V P
V N
49
50
SAG
DETECTION
5V TO 12V DC
V DCIN
64
VOLTAGE
SUPERVISORY
VOLTAGE
SUPERVISORY
POWER SUPPLY
MANAGEMENT
IPSMF SFR
(ADDR. 0xF8)
PSU
3.3V
REGULATOR
V DD
60
V SW
V SWOUT 61
V BAT 58
Figure 29. Power Supply Management for Energy Meter Application
V P – V N
SAG LEVEL TRIP POINT
SAGCYC = 1
V DCIN
1.2V
V DD
t 1
2.75V
t 2
SAG EVENT
(FSAG = 1)
V DCIN EVENT
(FVDCIN = 1)
IF SWITCHOVER ON LOW V DD IS ENABLED,
AUTOMATIC BATTERY SWITCHOVER
V SWOUT CONNECTED TO V BAT
BSO EVENT
(FBSO = 1)
Figure 30. Power Supply Management Interrupts and Battery Switchover with Only V DD Enabled for Battery Switchover
Rev. 0 | Page 28 of 128
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