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AS8118 Datasheet(PDF) 3 Page - ams AG

Part # AS8118
Description  Single Phase Instantaneous Energy Metering IC with On-Chip Calibration, Stepper Motor Drive and LED Output
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS8118 Datasheet(HTML) 3 Page - ams AG

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Data Sheet AS8118
Revision 1.8, 15-Feb-05
Page 3 of 30
Pin Description
Pin No.
Pin Name
Description
1
VP
Positive input for the voltage channel. VP is a differential input with VN. The differential voltage
should be set at
±150mV peak for rated voltage conditions. VP is an analog input pin.
2
VN
Negative input for the voltage channel. VN is a differential input with VP. VN is usually tied to 0V
potential (VSSA). VN is an analog input pin.
3
TM
On ‘power up’, the test mode input defines the operation mode of the device. Either ‘Normal
Operation’, or ‘Calibration’ modes may be selected. TM has an on-chip pull down resistor and
should be left unconnected during ‘Normal Operation’. TM must be set to logic ‘1’ at ‘power up’ to
set the device in ‘Calibration’ mode.
4
VSSA
Negative analog supply. VSSA is the ground reference for the analog circuitry.
5
PROG
Programming pin for calibration procedure. PROG is an analog input pin which must be left
unconnected during normal operation. Note: PROG must not be connected to VSS.
6
VSSD
Negative digital supply. VSSD is the ground reference for the digital circuitry.
7
DIRO
Direction output provides indication of the direction of current flow through the current sensor.
This digital input/output has an on-chip pull down resistor and provides logic ‘0’ for positive
power and logic ‘1’ for negative power. DIRO is used as an input during the programming cycle.
This output may be directly connected to a LED and is capable of driving 4mA.
8
CAL
Fast energy pulse output for calibration. CAL pulse rate is programmable and dependent upon
the selected MON/MOP frequency.
9
MOP
Positive motor drive signal. MOP and MON are low frequency outputs for directly driving a two
phase stepper motor. The frequency of the MOP/MON outputs is programmable to suite all
industry standards and is capable of driving 10mA.
10
MON
Negative motor drive signal. MON and MOP are low frequency outputs for directly driving a two
phase stepper motor. The frequency of the MOP/MON outputs is programmable to suite all
industry standards and is capable of driving 10mA.
11
LED
This output may be connected to an LED to display energy consumption. LED is a digital output,
which is programmable to a desired pulse rate. All the industry standard pulse rates are
available. This output is capable of driving 10mA.
12
VDDD
Positive digital supply. VDDD provides the supply voltage for the digital circuitry. The required
supply voltage is 5V
±10%.
13
XOUT
See XIN below, for the connection of a crystal or ceramic resonator. When an external clock is
applied to XIN, XOUT is not connected.
14
XIN
A 3.579545 MHz crystal or ceramic resonator may be connected across XIN and XOUT without
the need for external load capacitors. Alternatively, an external clock signal may be applied to
XIN.
15
VDDA
Positive analog supply. VDDA provides the supply voltage for the analog circuitry. The required
supply voltage is 5V
±10%.
16
DIRI
Direction input pin for selecting unidirectional or bi-directional energy measurement mode. When
DIRI is at logic ‘0’, the IC is set in unidirectional mode. When DIRI is at logic ‘1’ the IC is in bi-
directional mode. In default mode, when DIRI is not connected, the IC is in bi-directional mode.
DIRI is a digital input with an on-chip pull-up resistor.
17
IP
Positive input for the current channel. IP is a differential input with IN. The input gain is
programmable depending on the desired current sensor. The maximum differential voltage is
±150mV peak (Gain = 4). IP is an analog input pin.
18
IN
Negative input for the current channel. IN is a differential input with IP. The input gain is
programmable depending on the desired current sensor. IN is usually at 0V potential. IN is an
analog input pin.


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