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MCP3905
(Rev.:2007)

Energy-Metering ICs with Active (Real) Power Pulse Output

Microchip Technology 

MCP3905/06

TIMING CHARACTERISTICS

Electrical Specifications: Unless otherwise indicated, all parameters apply at AVDD = DVDD = 4.5V – 5.5V,

AGND, DGND = 0V, MCLK = 3.58 MHz; TA = -40°C to +85°C.

Parameter

Sym Min Typ Max Units

Comment

Frequency Output

FOUT0 and FOUT1 Pulse Width

(Logic-Low)

tFW

—

275

—

ms 984376 MCLK periods

(Note 1)

HFOUT Pulse Width

tHW

—

90

—

ms 322160 MCLK periods

(Note 2)

FOUT0 and FOUT1 Pulse Period

HFOUT Pulse Period

FOUT0 to FOUT1 Falling-Edge Time

FOUT0 to FOUT1 Min Separation

FOUT0 and FOUT1 Output High Voltage

FOUT0 and FOUT1 Output Low Voltage

HFOUT Output High Voltage

HFOUT Output Low Voltage

High-Level Input Voltage

(All Digital Input Pins)

tFP

tHP

tFS2

tFS

VOH

VOL

VOH

VOL

VIH

Refer to Equation 4-1

Refer to Equation 4-2

— 0.5 tFP —

— 4/MCLK —

4.5

—

—

—

—

0.5

4.0

—

—

—

—

0.5

2.4

—

—

s

s

V IOH = 10 mA, DVDD = 5.0V

V IOL = 10 mA, DVDD = 5.0V

V IOH = 5 mA, DVDD = 5.0V

V IOL = 5 mA, DVDD = 5.0V

V DVDD = 5.0V

Low-Level Input Voltage

(All Digital Input Pins)

VIL

—

—

0.85

V DVDD = 5.0V

Input Leakage Current

Pin Capacitance

—

— ±3

µA VIN = 0, VIN = DVDD

—

—

10

pF Note 3

Note 1:

2:

3:

If output pulse period (tFP) falls below 984376*2 MCLK periods, then tFW = 1/2 tFP.

If output pulse period (tHP) falls below 322160*2 MCLK periods, then tHW = 1/2 tHP.

Specified by characterization, not production tested.

FOUT0

FOUT1

tFW

tFS2

tFP

tFS

HFOUT

tHW

tHP

NEG

FIGURE 1-1:

Output Timings for Pulse Outputs and Negative Power Pin.

DS21948D-page 4

© 2007 Microchip Technology Inc.

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