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AS8118D18 Datasheet(PDF) 5 Page - ams AG |
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AS8118D18 Datasheet(HTML) 5 Page - ams AG |
5 / 30 page Data Sheet AS8118 Revision 1.8, 15-Feb-05 Page 5 of 30 -0 , 8 -0 , 6 -0 , 4 -0 , 2 0 0, 2 0, 4 0, 6 0, 8 F [ H z ) 4 5 50 55 65 60 Graph 7: Error as a % of reading with mains frequency variation Functional Description The AS8118 is a CMOS mixed signal integrated circuit that measures electrical power over a dynamic range of 600:1, to an accuracy of better than 0.1%. The AS8118 comprises of standard functional blocks including two sigma/delta modulators, which convert the analog voltage and current input signals into digital signals. The voltage and current signals are then digitally filtered, which eliminates offsets thus enabling a single point calibration cycle. A power calculation block calculates the active energy value. An on-chip voltage reference ( ±30ppm/K typical), oscillator and non-volatile calibration registers and control block for programming the AS8118 completes the core functional elements. Programming of the AS8118 enables the device to be configured to suite the users specific input and output requirements and allows for fast and efficient calibration. The AS8118 device provides the user with two complete opportunities to programme the device. The following parameters may be programmed via the on-chip non-volatile memory: - Current channel input gain - Calibration pulse output frequency - Stepper motor output drive frequency - LED output frequency - Anti-creep threshold - Calibration constant A detailed description of the versatility of the AS8118 is given below. Current Inputs for Energy Calculation The current channel input consisting of inputs IP and IN is differential and connected to a low resistance shunt or current transformer, in series with the load. The current input signal level may be programmed by means of an on-chip programmable gain amplifier (PGA). The gain is selected through the programming of 2 bits in the on-chip memory as follows: Parameter: Gain Setting Voltage Gain Input Voltage Comments 1 1 20 -30mVpeak ≤VIP≤30mVpeak Shunt mode 1 0 0 1 16 -38mVpeak ≤VIP≤38mVpeak CT mode 0 0 4 -150mVpeak ≤VIP≤150mVpeak CT mode |
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