MCP3909 Microchip Technology, MCP3909 Datasheet - Page 24

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

MCP3909
5.3
Multiplier mode allows the user to retrieve the output
of the multiplier on the MCP3909 device. Data is
presented in a 20 bit (19 bit + sign) protocol, MSB first.
A data ready flag (DR) is output for every MCLK/256
TABLE 5-2:
FIGURE 5-4:
DS22025A-page 24
0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1
1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
NEG / SDO
F2 / SCK
F1 / SDI
F0 / CS
Multiplier Output Mode
Multiplier Code
Hi-z
MULTIPLIER OUTPUT MODE CODING
Multiplier Output Mode.
Binary
DR
=
(
-------------------------------------------------------------------------------- - 524288 8.06 G
CH0
SIGN MSB
1
D19
2
D18
+
–
3
D17
CH0
4
D16
V
–
REF
) CH1
X 20
Hi-z
(
X 20
2
clock cycles and a new multiplier output value is
ready. If the multiplier value is not clocked out of the
device it will be over-written. Data is clocked out on the
rising edge of SCK.
17 18
+
D3
–
CH1
D2
Decimal
+524287
+524286
-524287
-524288
19 20
D1
-1
0
–
)
LSB
D0
•
© 2006 Microchip Technology Inc.
0
•
Hi-z
•