SA2005P Datasheet, PDF (8/16 Pages) Sames – Programmable Three Phase Power / Energy Metering IC for Stepper Motor / Impulse Counter Applications

SA2005P
sames
DEVICE CONFIGURATION
SIGNAL FLOW DESCRIPTION
The following is an overview of the SA2005P’s registers. For a
detailed description of each parameter please refer to
parameter description section. Figure 7 shows the various
registers in the SA2005P’s power to pulse rate block. The
inputs to this block are three single bit pulse density modulated
signals, each having a pulse rate of 641454 pulses per second
at rated conditions. The parameters Cb1, Cb2, Cb3, Sum, Ct,
Kr, CresH, CresL, Cled and Pw contain values that are read
from the external EEPROM during power up.
Power from S - D converters
641454 pulses/s
Pre-Divider
÷Cb1
Power from S - D converters
641454 pulses/s
Pre-Divider
÷Cb2
Programmable Adder SUM
Creep current threshold detector
Ct
Power from S - D converters
641454 pulses/s
Pre-Divider
÷Cb3
The Pre-Divider registers are used for calibration and to
balance the gain of each channel. The Programmable Adder is
used to select between the total sum or absolute sum of the
measured energy. The Creep current threshold detector
selects the creep current which is relative to the meters rated
current. The Rated Condition register is used to program the
rated condition of the meter and feeds the registers LED-
constant and Counter Resolution 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 Counter Pulse Width register is used to
program the pulse width for the mechanical counter driver
output MOP and MON.
EEPROM Memory Allocation
The following table shows the EEPROM memory allocation as
well as the corresponding name. The uneven byte always
Rated Condition
÷Kr
Counter
Resolution
CresH, CresL
Normally 1253p/s
Normally 6400p/kWh
LED-Constant
Cled
Counter Pulse
width
Pw
MOP MON
LED
Figure 7: Signal flow block diagram
contains a XORed byte of the previous even byte. This is the
checksum byte used by the SA2005P to ensure data integrity.
Description
E²Address
Contents
Bit [7:0]
Channel Balance 3
10
Cb3
---v vvvv
11
XOR of ADDR 10
xxxx xxxx
Channel Balance 1
12
Cb1
---v vvvv
13
XOR of ADDR 12
xxxx xxxx
Channel Balance 2
14
Cb2
---v vvvv
15
XOR of ADDR 14
xxxx xxxx
Summing mode
16
SUM
---- --vv
Creep current threshold
16
Ct
v--- ----
17
XOR of ADDR 16
xxxx xxxx
Rated Condition
20
Kr
vvvv vvvv
21
XOR of ADDR 20
xxxx xxxx
Led Pulse-rate
22
Cled
---- --vv
23
XOR of ADDR 22
xxxx xxxx
Counter Resolution (LSB)
24
CresL
vvvv vvvv
25
XOR of ADDR 24
xxxx xxxx
Counter Resolution (MSB)
26
ClresH
---v vvvv
Counter Pulse-Width
26
Pw
vv-- ----
27
XOR of ADDR 26
xxxx xxxx
KEY: (- = DON’T CARE); (V = VALUE/PARAMETER); (0,1 = LOGICAL VALUE); (X = BIT-XOR)
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Name
D10
D12
D13
D16
D16
D20
D22
D24
D26
D26