MCP3909 Microchip Technology, MCP3909 Datasheet - Page 28

• Manufacturer Part Number: MCP3909
• Description: Energy Metering IC with SPI Interface and Active Power Pulse Output
• Manufacturer: Microchip Technology

MCP3909
FIGURE 5-7:
idles low).
DS22025A-page 28
Data is clocked out
on rising edges of SCK
NEG / SDO
NEG / SDO
Device on falling edges of SCK
MCU latches data from
F2 / SCK
F2 / SCK
F1 / SDI
F1 / SDI
F0 / CS
MCU Transmit Buffer
F0 / CS
MCU Receive Buffer
MCU Transmit Buffer
MCU Receive Buffer
Multiplier Output Mode 1 SPI Communication using 8-bit segments (Mode 0,1: SCK
D19 D18 D17 D16
17
X
D3
D3
Data stored into MCU receive register
after transmission of first 8 bits
X
1
D19
Data stored into MCU receive register
after transmission of third 8 bits
18
X
D2
D2
X
D18 D17 D16
2
Don’t Care
X
19
D1 D0
D1 D0
X
3
20
X
X
4
D15 D14 D13 D12
X
21
X
0
5
D15 D14 D13
22
X
X
6
0
23
X
Don’t Care
X
0
7
24
X
X
0
8
D12
D11 D10 D9
X
Data stored into MCU receive register
after transmission of second 8 bits
D11 D10 D9
9
X
10
X
11
N = Null Bits
X = Don’t Care Bits
D8
X
12
D8
X
D7
13
D7
D6
X
14
© 2006 Microchip Technology Inc.
D6
D5
X
15
D5
X
D4
16
D4