MCP3909RD-1PH1 Microchip Technology, MCP3909RD-1PH1 Datasheet - Page 25

• Manufacturer Part Number: MCP3909RD-1PH1
• Description: BOARD DES MCP3909 ENERGY METER
• Manufacturer: Microchip Technology

Specifications of MCP3909RD-1PH1

• Main Purpose: Power Management, Energy/Power Meter
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: MCP3909, PIC18F85J90
• Primary Attributes: Single Phase Shunt Energy Meter
• Secondary Attributes: 16 Bit ADC
• Ic Function: Single Phase Energy Measurement IC
• Supply Voltage Range: 4.5V To 5.5V
• Operating Temperature Range: -40°C To +85°C
• Digital Ic Case Style: SSOP
• No. Of Pins: 24
• Interface Type: SPI
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

5.0
5.1
The MCP3909 device contains three serial modes that
are accessible by changing the pin functionality of the
NEG, F2, F1, and F0 pins to SDO, SCK, SDI and CS,
respectively.
These modes are entered by giving the MCP3909
device a serial command on these pins during a time
window after device reset or POR. During this window
of time, F2 acts as SCK, F1 acts as SDI and F0 acts
as CS. Once a serial mode has been entered, the
device must be reset to disable mode functionality, or
change to another serial mode. This is done by using
MCLR pin or power on reset event.
During serial mode entry and the three serial modes,
data is clocked into the device on the rising edge of
SCK and out of the device on the falling edge of SCK.
The SPI data can be access at up to 20 MHz. This
speed enables quick data retrieval in between
conversion times. For 3-phase metering applications
with multiple ADCs, this fast communication is essen-
tial to allow for power calculation windows between
conversions, as shown in
FIGURE 5-2:
© 2009 Microchip Technology Inc.
SDO DR
IRQ
SERIAL INTERFACE
DESCRIPTION
Dual Functionality Pin And Serial
Interface Overview
IRQ
Phase A,B,C I & V Data
Data Access between Data Ready Pulses using SPI Interface for a 3-phase System.
Figure
x 6 ADCs
16 bits
t
LINE_CYC
5-3.
t
SAMPLE
t
SAMPLE
After a serial mode has been entered, all blocks of the
MCP3909 device are still operational. The PGA, A/D
converters, HPF, multiplier, LPF, and other digital
sections are still functional, allowing the device to have
true dual functionality in energy metering systems.
FIGURE 5-1:
the MCP3909.
REFIN / OUT
F2 / SCK
MCLR
CH0+
CH1+
DV
AV
CHO-
A
CH1-
HPF
GND
NC
DD
DD
Dual Functionality Pins for
10
11
12
1
2
3
4
5
6
7
8
9
DR
MCP3909
24
23
22
21
20
19
18
15
17
16
14
13
G0
F1 / SDI
F
F
HF
D
NEG / SDO
NC
CLKOUT
CLKIN
G1
F0 / CS
OUT0
OUT1
GND
OUT
DS22025B-page 25