BL6502A
FEATURES
High accuracy, less than 0.1% error over a
dynamic range of 500 : 1
Exactly measure the real power in the positive
orientation and negative orientation, calculate the
energy in the same orientation
Two current monitors continuously monitor the
phase and neutral currents in two-wire distribution
systems. Uses the larger of two currents to bill, even
during a Fault condition
A PGA in the current channel allows using small
value shunt and burden resistance
The low frequency outputs F1 and F2 can
directly drive electromechanical counters and two
phase stepper motors and the high frequency output
CF, supplies instantaneous real power, is intended for
calibration and communications
Two logic outputs REVP and FAULT can be used
to indicate a potential orientation or Fault condition
On-Chip power supply detector
On-Chip anti-creep protection
On-Chip voltage reference of 2.5V±8% (typical
temperature coefficient of 30ppm/℃)，with external
overdrive capability
Single 5V supply
Low static power (typical value of 25mW).
The technology of SLiM (Smart–Low–current–
Management )
is used.
Single Phase Energy Meter IC
with Integrated Oscillator
DESCRIPTION
The BL6502A is a low cost, high accuracy, high
stability, simple peripheral circuit electrical energy
meter IC. The meter based on the BL6502A is
intended
for
using
in
single-phase,
two-wire
distribution systems. It can exactly measure the real
power in the positive orientation and negative
orientation and calculate the energy in the same
orientation.
The BL6502A incorporates a novel
fault
detection scheme that both warns of fault conditions
and allows the BL6502A to continue accurate billing
during a fault event. The BL6502A does this by
continuously monitoring both the phase and neutral
(return) currents. Fault condition is indicated by
PIN19 (FAULT), when these currents differ by more
than
12.5%
. Billing is continued using the larger of the
two currents when the difference is greater than 14%.
The BL6502A supplies average real power
information on the low frequency outputs F1 (Pin23)
and F2 (Pin24). These logic outputs may be used to
directly drive an electromechanical counter and
two-phase stepper motors. The CF (Pin22) logic
output gives instantaneous real power information.
This output is intended to be used for calibration
purposes or interface to an MCU.
BL6502A thinks over the stability of reading
error in the process of calibration.. An internal no-load
threshold ensures that the BL6502A does not exhibit
Interrelated patents are pending
any creep when there is no load.
BLOCK DIAGRAM
VDD
NC
NC
V1A
V1B
V1N
V2N
V2P
NC
1
2
3
4
24
23
22
21
20
19
F1
F2
CF
NC
VREF
input contron
voltage
reference
internal
oscillator
VDD
power
detector
5
REVP
FAULT
NC
NC
G0
G1
S0
S1
6
7
8
BL6502A
V1A
V1B
V1N
V2P
V2N
BL6502A
high
pass
filter
high
pass
filter
digital
multiplic
ation
low
pass
filter
digital
to
frequency
and
output
current
sampling
analog
to
digital
analog
to
digital
18
17
voltage
sampling
9
10
11
12
16
15
14
13
FAULT
REVP
CF
F1
F2
VREF
GND
SCF
logic contron
G0
G1
SCF
S0
S1
DIP/SSOP 24
http://www.belling.com.cn
-1-
Total
14 Pages
3/15/2007
BELLING [ SHANGHAI BELLING CO., LTD. ]
