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MCP3909 датащи(PDF) 24 Page - Microchip Technology

номер детали MCP3909
подробное описание детали  Energy Metering IC with SPI Interface and Active Power Pulse Output
PDF  40 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP3909 датащи(HTML) 24 Page - Microchip Technology

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MCP3909
DS22025A-page 24
© 2006 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
presented 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.
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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