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MCP3909-I/SS Fiches technique(PDF) 29 Page - Microchip Technology

No de pièce MCP3909-I/SS
Description  Energy Metering IC with SPI Interface and Active Power Pulse Output
PDF  44 Pages
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Fabricant  MICROCHIP [Microchip Technology]
Site Internet  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP3909-I/SS Fiches technique(HTML) 29 Page - Microchip Technology

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© 2009 Microchip Technology Inc.
DS22025B-page 29
MCP3909
5.6
Filter Input Mode
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 HFOUT, FOUT0 and FOUT1. See
Tables 4-2 and 4-3 for transfer functions of the output
frequencies.
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.
FIGURE 5-6:
Filter Input Mode.
D3 D2
D1 D0
Hi-z
D16
D18 D17
1
23
17 18
19 20
X 20
X 20
4
D19
Hi-z
DR
F1 / SDI
F2 / SCK
NEG / SDO
F0 / CS



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