BL0921

BL0921

BL0921

BL0921

http://www.belling.com.cn

- 2 -

3/15/2007

Total 13 Pages

Single Phase Energy Meter IC

Single Phase Energy Meter IC

Single Phase Energy Meter IC

Single Phase Energy Meter IC

with Integrated Oscillator

with Integrated Oscillator

with Integrated Oscillator

with Integrated Oscillator

PIN DESCRIPTIONS

Pin

Symbol

DESCRIPTIONS

1

VDD

Power Supply (+5V). Provides the supply voltage for the digital circuitry. It should be

maintained at 5 V±5% for specified operation.

2,3

V1A,V1B

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.

4

V1N

Negative Input Pin for Differential Voltage Inputs V1A and V1B.

5,6

V2N,V2P

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.

7

VREF

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.

8

AGND

Ground Reference. Provides the ground reference for the circuitry.

9,10

S1,S0

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.

11

G

Gain Select. These logic inputs are used to select one of four possible gains for current

channel. The possible gains are 1 and 16.

12

FAULT

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.

13

REVP

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.

14

CF

Calibration Frequency. The CF logic output gives instantaneous real power

information. This output is intended to use for calibration purposes.

15,16

F1,F2

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.

ABSOLUTE MAXIMUM RATINGS

( T = 25 ℃ )

Parameter

Symbol

Value

Unit

Power Voltage VDD

VDD

-0.3~+7(max)

V

Input Voltage of Channel 2 to GND

V (V)

VSS+0.5≤V(v)≤VDD-0.5

V

Input Voltage of Channel 1 to GND

V (I)

VSS+0.5≤V(i)≤VDD-0.5

V

Operating Temperature Range

Topr

-40~+75

℃

Storage Temperature Range

Tstr

-55~+150

℃

Power Dissipation

400

mW