MCP3909-ESLASHSS datasheet(26/44 Pages) MICROCHIP

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MCP3909

DS22025C-page 26

 2006-2012 Microchip Technology Inc.

5.3

Multiplier Output Mode

Multiplier mode allows the user to retrieve the output

of the multiplier on the MCP3909 device. Data is pre-

sented in a 20 bit (19 bit + sign) protocol, MSB first. A

data ready flag (DR) is output for every MCLK/256

clock cycles and a new multiplier output value is ready.

If the multiplier value is not clocked out of the device it

will be over-written. Data is clocked out on the rising

edge of SCK.

EQUATION 5-1:

FIGURE 5-4:

Multiplier Output Mode.

TABLE 5-2:

MULTIPLIER OUTPUT MODE CODING

Binary

Decimal

0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

+524287

0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0

+524286

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

-1

1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1

-524287

1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

-524288

Multiplier Code

CH0

–

 CH1

CH1

–



VREF 2

---------------------------------------------------------------------------------- 524288 8.06 G



F1 / SDI

D3 D2

D1 D0

Hi-z

D16

D17

17 18

19 20

Hi-z

X 20

D18

D19

F2 / SCK

NEG / SDO

F0 / CS

SIGN MSB

LSB

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