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SA2002P Folha de dados(PDF) 7 Page - Sames |
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SA2002P Folha de dados(HTML) 7 Page - Sames |
7 / 14 page 7/14 http://www.sames.co.za sames SA2002P Description E Address 2 Contents Bit [7:0] Name Pre-Divider Rated Condition Counter Resolution (LSB) Counter Resolution (MSB) Counter Pulse-Width 12 13 14 14 14 15 16 17 18 19 20 21 22 22 23 Cor XOR of ADDR 12 Ct Ds Dc XOR of ADDR 14 Kr XOR of ADDR 16 Cled XOR of ADDR 18 CresL XOR of ADDR 20 ClresH Pw XOR of ADDR 22 ---v vvvv xxxx xxxx ---- ---v ---- -v-- ---- v--- xxxx xxxx vvvv vvvv xxxx xxxx ---- --vv xxxx xxxx vvvv vvvv xxxx xxxx ---v vvvv vv-- ---- xxxx xxxx D12 D14 D14 D14 D16 D18 D20 D22 Creep current threshold Metering direction select DC or AC measurement mode Led Pulse-rate KEY: (- = DON’T CARE); (V = VALUE/PARAMETER); (0,1 = LOGICAL VALUE); (X = BIT-XOR) DEVICE CONFIGURATION SIGNAL FLOW DESCRIPTION The following is an overview of the SA2002P’s registers. For a detailed description of each parameter please refer to parameter description section. Figure 8 shows the various registers in the SA2002P’s power to pulse rate block. The input to this block is a single bit pulse density modulated signal of 641454 pulses per second at rated conditions. The parameters and contain values which are read from the external EEPROM during power up. The divider registers, and , are used for gain calibration. The register is used to set the SA2002P’s creep threshold. register is also used to program the rated condition of the meter and feeds the registers and with the applicable pulse rate. These two registers are programmed to select the LED output rate and the counter resolution (pulses per kWh) respectively. The register is used to program the pulse width for the mechanical counter driver output MOP and MON. Cor, Ct, Kr, CresH, CresL, Pw, Cled, Dc Ds Pre-Divider Rated Condition Creep current threshold The Rated Condition LED-constant Counter Resolution Counter Pulse Width EEPROM Memory Allocation The following table shows the EEPROM memory allocated as Pre-Divider ÷Cor Test Mode Tm AC/DC Mode Dc Metering Direction Ds Rated Condition ÷Kr Counter Resolution CresH, CresL LED-Constant Cled Counter Pulse width Pw MOP MON LED Normally 6400p/kWh Normally 1253p/s Power from converters 641454 pulses/s S - D Creep current threshold detector Ct Figure 8: Signal flow block diagram well as the corresponding name. The uneven byte always contains a XORed byte of the previous even byte. This is the checksum byte used by the SA2002P to ensure data integrity. Table 1: EEPROM memory allocation map |
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