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MCP3909-I

Energy Metering IC with SPI Interface and Active Power Pulse Output

Microchip Technology 

MCP3909

TIMING CHARACTERISTICS (CONTINUED)

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

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

Parameter

Sym

Min

Typ

Max Units

Comment

Serial Interface Timings (Note 4)

Data Ready Pulse Width

Reset Time

Output Data Rate

Serial Clock Frequency

Window for serial mode entry

codes

tDR

4/MCLK

tRST

100

—

—

fADC

— MCLK/256 —

fCLK

—

20

tWINDOW

—

—

32/

MCLK

ns

MHz

—

VDD = 5V

Last bit must be clocked in

before this time.

Window start time for serial

mode entry codes

tWINSET 1/MCLK

—

—

— First bit must be clocked in

after this time.

Serial Clock High Time

tHI

—

—

25

ns fCLK= 20 MHz

Serial Clock Low Time

tLO

—

—

25

ns fCLK= 20 MHz

CS Fall to First Rising CLK Edge tSUCS

15

—

—

ns

Data Input Setup Time

tSU

10

—

—

ns

Data Input Hold Time

tHD

—

—

10

ns

CS Rise to Output Disable

tDIS

—

—

150

ns

CLK Rise to Output Data Valid

tDO

—

—

30

ns

SDO Rise Time

tR

—

2

—

ns

SDO Fall Time

tF

—

2

—

ns

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. When F2, F1, F0

equals 0,1,1, the HFOUT pulse time is fixed at 64 x MCLK periods or 18 µs for MCLK = 3.58 MHz.

Specified by characterization, not production tested.

4: Serial timings specified and production tested with 180 pF load.

DS22025C-page 6

 2006-2012 Microchip Technology Inc.

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