AS8118 [AMSCO]
Single Phase Instantaneous Energy Metering IC with On-Chip Calibration, Stepper Motor Drive and LED Output; 单相瞬时电能计量IC，具有片内校准，步进电机驱动器和LED输出
| 型号： | AS8118 |
| 厂家： | 
AMS(艾迈斯) |
| 描述： | Single Phase Instantaneous Energy Metering IC with On-Chip Calibration, Stepper Motor Drive and LED Output |
| 文件： | 总1页 (文件大小：36K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AS8118
Single Phase Instantaneous Energy Metering IC
with On-Chip Calibration, Stepper Motor Drive and LED Output
FEATURES
control block and non-volatile calibration memory for the
on-chip programming. The on-chip programming enables
the setting of the current input gain, the anti-creep
threshold, the output pulse rates and the system
calibration. The high level of integration ensures a
minimum number of non-critical external components are
required.
Features
-
Extremely accurate, surpassing the accuracy
requirements of the IEC 1036 Specification less than
0.1% error over a 600 : 1 dynamic range
On-chip programmable current input gain suitable for
use with low-resistance shunt resistor or current
transformer
-
The on-chip anti-creep circuit ensures that the AS8118
does not output pulses when the meter is in a no-load
condition and that the IEC1036 anti-creep test
requirements are fully complied with, for both direct or
transformer connection meters.
-
-
On-chip programming for output pulse rate selection
On-chip calibration eliminates the need for an external
resistor network or trim-potentiometer
Programmable on-chip creep prevention under no-
load condition
-
-
-
All on-chip programmable functions may be
reprogrammed a second time
The AS8118 offers three different pulse outputs. A
stepper motor drive output for directly driving a stepper
motor display, a LED output for energy consumption
indication and a dedicated high frequency output for fast
single point system calibration.
Outputs directly drive an electromechanical counter or
counters with a two phase stepper motor and
consumption LED indicator
-
-
-
Fast calibration pulse output for high speed manual or
automated calibration
The AS8118 is available in either surface mount SOIC-18
or dual-in-line DIP-18 packages.
On-chip voltage reference and power supply
monitoring
Block Diagram
Bi-directional or unidirectional energy measurement,
with direction indication output available
Description
Non-volatile
Calibration
AGND
Buffer
The AS8118 is a very accurate single-phase bi-directional
instantaneous energy measurement integrated circuit,
which surpasses all the accuracy requirements for
IEC1036 alternating current static watt-hour meters. The
measured energy is converted into pulses with the
number of output pulses being proportional to the
measured energy.
VP
VN
Digital
Filter
Σ∆-mod
Power
Calculation
IP
IN
Digital
Filter
Σ∆-mod
VREF
The AS8118 is ideal for use in ‘stand alone’ kWh meter
applications, where the IC directly drives an
CAL
LED
MON
MOP
XIN
Crystal
Osc
XOUT
Control
electromechanical counter with a two-phase stepper
motor, or for more complex meter applications, the
AS8118 interfaces directly to a micro-controller.
POR
The highly integrated AS8118 design includes all the
required functional blocks. The blocks comprise of analog
to digital converters (ADC) for the voltage and current
channels, digital filters, a digital signal processing block, a
Figure 1
Block diagram of the AS8118
Revision 1.7, 22-Nov-04
Page 1 of 1
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