MCP3909 Microchip Technology, MCP3909 Datasheet - Page 26

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

MCP3909
5.6
The filter input mode allows the user to feed the
MCP3909 device an input to the LPF1. Data is
received MSB first. The MCP3909 will treat this data
as if it were the output of the multiplier and will LPF
and D-F the result as normal, giving the resulting
output frequency on HF
Tables 4-2
frequencies.
FIGURE 5-6:
DS22025A-page 26
NEG / SDO
F2 / SCK
F1 / SDI
F0 / CS
Filter Input Mode
and
4-3
for transfer functions of the output
Hi-z
Filter Input Mode.
OUT
, F
DR
OUT0
and F
D19
1
OUT1
D18 D17
2
. See
3
D16
4
X 20
X 20
When using filter input mode, the user must wait for
the data ready flag (DR) to appear on SDO before
attempting to clock in data to the device. The user can
not access either the multiplier output or the dual
channel output while in this mode.
17 18
D3
D2
D1
19 20
D0
© 2006 Microchip Technology Inc.
Hi-z