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MCP3909-E/SS датащи(PDF) 26 Page - Microchip Technology

номер детали MCP3909-E/SS
подробное описание детали  Energy Metering IC with SPI Interface and Active Power Pulse Output
PDF  44 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP3909-E/SS датащи(HTML) 26 Page - Microchip Technology

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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
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
+
CH0
–
–
 CH1
+
CH1
–
–

VREF 2
---------------------------------------------------------------------------------- 524288 8.06 G
=
F1 / SDI
D3 D2
D1 D0
Hi-z
Hi-z
D16
D17
1
23
17 18
19 20
Hi-z
X 20
X 20
4
DR
0
D18
D19
F2 / SCK
NEG / SDO
F0 / CS
SIGN MSB
LSB



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