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SA2002P Folha de dados(PDF) 7 Page - Sames

Nome de Peças SA2002P
Descrição Electrónicos  Programmable Single Phase Kilowatt-hour Energy IC for Mechanical Counter Application
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Fabricante Electrônico  SAMES [Sames]
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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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