BL0921
PIN DESCRIPTIONS
Pin
1
Symbol
VDD
Single Phase Energy Meter IC
with Integrated Oscillator
DESCRIPTIONS
Power Supply (+5V). Provides the supply voltage for the digital 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.
On-Chip Voltage Reference. The on-chip reference has a nominal value of 2.5V
±
8% . An external reference source may also be connected at this pin.
Ground Reference. Provides the ground reference for the circuitry.
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 and 16.
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.
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.
2,3
4
5,6
V1A,V1B
V1N
V2N,V2P
7
8
9,10
VREF
AGND
S1,S0
11
G
12
FAULT
13
REVP
14
15,16
CF
F1,F2
ABSOLUTE MAXIMUM RATINGS
( T = 25
℃
)
Parameter
Power Voltage VDD
Input Voltage of Channel 2 to GND
Input Voltage of Channel 1 to GND
Operating Temperature Range
Storage Temperature Range
Power Dissipation
Symbol
VDD
V (V)
V (I)
Topr
Tstr
Value
-0.3~+7(max)
VSS+0.5≤V(v)≤VDD-0.5
VSS+0.5≤V(i)≤VDD-0.5
-40~+75
-55~+150
400
Unit
V
V
V
℃
℃
mW
http://www.belling.com.cn
-2-
Total
13 Pages
3/15/2007
BELLING [ SHANGHAI BELLING CO., LTD. ]
