MCP3909 Microchip Technology, MCP3909 Datasheet - Page 29

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

FIGURE 5-8:
SCK idles low).
© 2006 Microchip Technology Inc.
NEG / SDO
NEG / SDO
F2 / SCK
F2 / SCK
F1 / SDI
F1 / SDI
F0 / CS
F0 / CS
MCU Transmit Buffer
MCU Receive Buffer
Data is clocked out
on rising edges
Data is clocked out
on rising edges
MCU Transmit Buffer
MCU Receive Buffer
Device on falling edges of SCK
MCU latches data from
Device on falling edges of SCK
MCU latches data from
Dual Channel Output Mode SPI Communication using 8-bit segments (Mode 0,1:
D15 D14 D13 D12
D15
X
17
D15
CH1 Data stored into MCU receive regis-
ter after transmission of third 8 bits
1
D15 D14 D13 D12
D14 D13 D12 D11
X
X
18
CH0 Data stored into MCU receive regis-
ter after transmission of first 8 bits
2
D14 D13 D12 D11
X
X
19
3
X
X
20
4
D11 D10 D9
X
X
21
5
D11 D10 D9
X
D10 D9
X
22
6
D10 D9
CHANNEL 0
CHANNEL 1
X
X
Don’t Care
Don’t Care
23
7
D8
X
X
D8
24
8
D8
D8
X
D7
D7
X
CH1 Data stored into MCU receive register
after transmission of fourth 8 bits
D7
25
9
D7
D6
X
X
D6
CH0 Data stored into MCU receive register
after transmission of second 8 bits
26
10
D6
D6
D5
X
X
D5
27
11
D5
D5
D4 D3
X
X
D4
28
12
D4 D3
D4 D3
X
X
D3
29
13
X
D2
X
D2
30
14
D2
D2
D1
X
X
D1
31
15
MCP3909
D1
D1
D0
X
X
D0
32
16
D0
D0
X
DS22025A-page 29