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MCP3909 Datasheet(PDF) 31 Page - Microchip Technology

Part # MCP3909
Description  Energy Metering IC with SPI Interface and Active Power Pulse Output
PDF  44 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP3909 Datasheet(HTML) 31 Page - Microchip Technology

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© 2009 Microchip Technology Inc.
DS22025B-page 31
MCP3909
FIGURE 5-7:
Multiplier Output Mode 1 SPI Communication using 8-bit segments (Mode 0,1:
SCK idles low).
12
3
4
5
6
7
8
9
10
11
12
13
14
15
16
D19
D15 D14 D13
D12
D11 D10 D9 D8
MCU latches data from
Data is clocked out
on rising edges of SCK
Device on falling edges of SCK
Don’t Care
X
XX
X
X
X
X
D15 D14 D13 D12
D11 D10 D9
D8
D19 D18 D17 D16
X
X
X
MCU Transmit Buffer
MCU Receive Buffer
X
Data stored into MCU receive register
after transmission of first 8 bits
Data stored into MCU receive register
after transmission of second 8 bits
D18 D17 D16
X
X
X
X
X
17
18
19
20
21
22
23
24
D2 D1 D0
X
X
D3 D2 D1 D0
X
X
X
MCU Transmit Buffer
MCU Receive Buffer
Data stored into MCU receive register
after transmission of third 8 bits
D3
X
X
X
D7
D6 D5
D4
Don’t Care
X = Don’t Care Bits
N = Null Bits
0
0
0
0
D7
D6 D5 D4
F1 / SDI
F2 / SCK
NEG / SDO
F0 / CS
F0 / CS
F2 / SCK
F1 / SDI
NEG / SDO



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