BL6501
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 2.42V
±
8%
(typical temperature coefficient of 30ppm/℃)，with
external overdrive capability
Single 5V supply
Low static power (typical value of 15mW).
The technology of SLiM (Smart–Low–current–
Management )
years
Interrelated patents are pending
is used.
Credible work, working time is more than twenty
Meter
Single Phase Energy Meter IC
DESCRIPTION
The BL6501 is a low cost, high accuracy, high
stability, simple peripheral circuit electrical energy
meter IC. The meter based on the BL6501 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 BL6501 incorporates a novel fault detection
scheme that both warns of fault conditions and allows
the BL6501 to continue accurate billing during a fault
event. The BL6501 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%. Billing is continued using the larger of the two
currents when the difference is greater than 14%.
The BL6501 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.
BL6501 thinks over the stability of reading
error in the process of calibration.. An internal no-load
threshold ensures that the BL6501 does not exhibit
any creep when there is no load.
BLOCK DIAGRAM
DVDD
AC/DC
AVDD
V1A
V1B
V1N
V2N
V2P
RESET
1
2
3
4
5
6
7
8
9
24
23
22
21
20
VREF
input control
AVDD
power
detector
F1
F2
CF
DGND
REVP
FAULT
CLKOUT
CLKIN
G0
G1
S0
S1
voltage
reference
V1A
V1B
V1N
V2P
V2N
current
sampling
analog
to digital
high
pass
filter
high
pass
filter
BL6501
FAULT
digital
multiplication
low
pass
filter
digital to
frequency
and
output
BL6501
19
18
17
16
15
14
13
REVP
CF
F1
F2
voltage
sampling
analog
to digital
VREF
10
AGND
11
SCF
12
logical control
DIP/SSOP 24
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G0 G1
AC/DC
RESET
SCF
S0
S1
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BL6501
PIN DESCRIPTIONS
Pin
1
2
3
Symbol
DVDD
AC/
DC
AVDD
Meter
Single Phase Energy Meter IC
DESCRIPTIONS
Digital Power Supply (+5V). Provides the supply voltage for the digital circuitry. It
should be maintained at 5 V±5% for specified operation.
High-Pass Filter Select. This logic input is used to enable the high pass filter in the
current channel. Logic high on this pin enables the HPF.
Analog Power Supply (+5V). Provides the supply voltage for the analog circuitry. It
should be maintained at 5 V±5% for specified operation.
Inputs for Current Channel. These inputs are fully differential voltage inputs with a
maximum signal level of
±660
mV with respect to pin6 (V1N) for specified
operation.
Negative Input Pin for Differential Voltage Inputs V1A and V1B.
Negative and Positive Inputs for Voltage Channel. These inputs provide a fully
differential input pair. The maximum differential input voltage is
±660
mV for
specified operation.
Reset Pin. Logic low on this pin will hold the ADCs and digital circuitry in a reset
condition and clear internal registers.
On-Chip Voltage Reference. The on-chip reference has a nominal value of 2.42V
±
8% and a typical temperature coefficient of 30ppm/℃. An external reference source
may also be connected at this pin.
Analog Ground Reference. Provides the ground reference for the analog circuitry.
Calibration Frequency Select. This logic input is used to select the frequency on the
calibration output CF.
Output Frequency Select. These logic inputs are used to select one of four possible
frequencies for the digital-to-frequency conversion. This offers the designer greater
flexibility when designing the energy meter.
Gain Select. These logic inputs are used to select one of four possible gains for current
channel. The possible gains are 1, 2, 8, and 16.
Clock In. An external clock can be provided at this logic input. Alternatively, a crystal
can be connected across this pin and pin18 (CLKOUT) to provide a clock source
Clock Out. A crystal can be connected across this pin and pin17 (CLKIN) as described
above to provide a clock source.
Fault Indication. Logic high indicates fault condition. Fault is defined as a condition
under which the signals on V1A and V1B differ by more than 12.5%. The logic output
will be reset to zero when fault condition is no longer detected.
Negative Indication. Logic high indicates negative power, i.e., when the phase angle
between the voltage and current signals is greater that 90°. This output is not latched
and will be reset when positive power is once again detected.
Digital Ground Reference. Provides the ground reference for the digital circuitry.
Calibration Frequency. The CF logic output gives instantaneous real power
information. This output is intended to use for calibration purposes.
Low-Frequency. F1 and F2 supply average real power information. The logic outputs
can be used to directly drive electromechanical counters and 2-phase stepper motors.
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4,5
6
7,8
V1A,V1B
V1N
V2N,V2P
9
RESET
VREF
AGND
SCF
10
11
12
13,14
S1,S0
15,16
17
18
G1,G0
CLKIN
CLKOUT
19
FAULT
20
21
22
23,24
REVP
DGND
CF
F1,F2
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BL6501
ABSOLUTE MAXIMUM RATINGS
( T = 25
℃
)
Parameter
Analog Power Voltage AVDD
Digital power Voltage DVDD
DVDD to AVDD
Analog Input Voltage of Channel 2 to AGND
Analog Input Voltage of Channel 1 to AGND
Operating Temperature Range
Storage Temperature Range
Power Dissipation（DIP24）
V (V)
V (I)
Topr
Tstr
Symbol
AVDD
DVDD
Meter
Single Phase Energy Meter IC
Value
-0.3~+7(max)
-0.3~+7(max)
-0.3~+0.3
VSS+0.5≤V(v)≤VDD-0.5
VSS+0.5≤V(i)≤VDD-0.5
-40~+85
-55~+150
400
Unit
V
V
V
V
V
℃
℃
mW
Electronic Characteristic Parameter
(T=25℃, AVDD=5V, DVDD= 5V, CLKIN=3.58MHz
Parameter
1 Analog Power Current
2 Digital Power Current
3 Logic Input Pins
G0, G1, SCF,S0,S1,
ACDC, /RESET
Input High Voltage
Input Low Voltage
Input Capacitance
4 Logic Output Pins
F1, F2
Output High Voltage
Output Low Voltage
Output Current
5 Logic Output Pins
CF, REVP, FAULT
Output High Voltage
Output Low Voltage
6 On-chip Reference
7 Analog Input Pins
V1A, V1B, V1N
V2N, V2P
Maximum Input Voltage
DC Input Impedance
Input Capacitance
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)
Min
Value
Typical
Value
2
1
Max
Value
3
2
Unit
mA
mA
Symbol
I
AVDD
I
DVDD
Test Condition
Measure
Pin
Pin1
Pin3
Pin2,
9,12,
13,14,
15,16
V
IH
V
IL
C
IN
AVDD=5V
DVDD=5V
Pin23,
24
2
1
10
V
V
pF
V
OH1
V
OL1
I
O1
I
H
=10mA
I
L
=10mA
4.4
0.5
10
Pin22,
20,19
V
V
mA
V
OH2
V
OL2
Vref
I
H
=10mA
I
L
=10mA
AVDD=5V
Pin10
Pin4,
5,6,
7,8
4
0.5
2.3
2.6
2.8
V
V
V
V
AIN
330
±1
10
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V
Kohm
pF
v1.20
BL6501
8 Accuracy
Measurement Error on
Channel 1 and 2
Gain=1
Gain=2
Gain=8
Gain=16
Phase Error
Channels
between
ENL1
ENL2
ENL8
ENL16
Both Channels with
Full-Scale Signal
±660mV
Over a Dynamic
Range500 to 1
Meter
Single Phase Energy Meter IC
Pin22
Pin22
Pin22
Pin22
0.1
0.1
0.1
0.1
0.4
0.4
0.4
0.4
%
%
%
%
Channel 1 Lead 37°
(PF=0.8Capacitive)
Channel 1 Lags
(PF=0.5Inductive)
9 Start Current
I
START
Ib=5A C=3200,
cosϕ=1
Voltage Channel
Inputs
±110mV
Gain of Current
Channel 16
10 Positive and Negative
Real Power Error (%)
ENP
Vv=±110mV,V(I)=
2mV, cosϕ=1
Vv=±110mV,V(I)=
2mV, cosϕ=-1
External 2.5V
Reference,Gain=1,
V1=V2=500mV
DC
Power Supply vary
from 3.5V to
5V,and Current
Channel with
Full-Scale Signal
Pin22
Pin22
Pin5
0.2%I
b
0.1
0.1
0.3
0.3
%
%
A
Pin22
0.4
%
11 Gain Error
Gain
error
Pin22
±10
%
12 Gain Error Match
13Power Supply
Monitor Voltage
V
down
Pin22
Pin22
0.2
3.9
4
1
4.1
%
V
TERMINOLOGY
1) Measurement Error
The error associated with the energy measurement made by the BL6501 is defined by the
following formula:
Pencentage Error
=
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Energy
Re
gistered by the BL
0951
−
True Energy
×
100%
True Energy
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200233
810 Yishan Rd., Shanghai, China
BL6501
Meter
Single Phase Energy Meter IC
2) Nonlinear Error
The Nonlinear Error is defined by the following formula:
eNL%＝[(Error at X-Error at Ib) / (1+Error at Ib )]*100%
When V(v)=
±110mV,
cosϕ=1, over the arrange of 5%Ib to 800%Ib, the nonlinear error should be
less than 0.1%.
3) Positive And Negative Real Power Error
When the positive real power and the negative real power is equal, and V(v) =±110mV, the test
current is Ib, then the positive and negative real power error can be achieved by the following
formula:
eNP%=|[(eN%-eP%)/(1+eP%)]*100%|
Where: eP% is the Positive Real Power Error, eN% is the Negative Real Power Error.
4) Phase Error Between Channels
The HPF (High Pass Filter) in Channel 1 has a phase lead response. To offset this phase response
and equalize the phase response between channels, a phase correction network is also placed in
Channel 1. The phase correction network matches the phase to within
±0.1°over
a range of 45
Hz to 65 Hz and
±0.2°over
a range 40Hz to 1KHz.
5) Gain Error
The gain error of the BL6501 is defined as the difference between the measured output frequency
(minus the offset) and the ideal output frequency. It is measured with a gain of 1 in channel V1.
The difference is expressed as a percentage of the ideal frequency. The ideal frequency is obtained
from the BL6501 transfer function.
6) Gain Error Match
The gain error match is defined as the gain error (minus the offset) obtained when switching
between a gain of 1 and a gain of 2, 8, or 16. It is expressed as a percentage of the output
frequency obtained under a gain of 1. This gives the gain error observed when the gain selection is
changed from 1 to 2, 8 or 16.
7) Power Supply Monitor
BL6501 has the on-chip Power Supply monitoring The BL6501 will remain in a reset
condition until the supply voltage on AVDD reaches 4 V. If the supply falls below 4 V, the BL6501
will also be reset and no pulses will be issued on F1, F2 and CF.
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v1.20
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