MCP3909-I/SS Microchip Technology, MCP3909-I/SS Datasheet - Page 25

• Manufacturer Part Number: MCP3909-I/SS
• Description: IC POWER METERING-1 PHASE 24SSOP
• Manufacturer: Microchip Technology

Specifications of MCP3909-I/SS

• Package / Case: 24-SSOP (0.200", 5.30mm Width)
• Input Impedance: 390 KOhm
• Measurement Error: 0.1%
• Voltage - I/o High: 2.4V
• Voltage - I/o Low: 0.85V
• Current - Supply: 2.3mA
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Meter Type: Single Phase
• Operating Temperature Range: - 40 C to + 85 C
• Mounting Style: SMD/SMT
• Supply Voltage Range: 4.5V To 5.5V
• Digital Ic Case Style: SSOP
• No. Of Pins: 24
• Interface Type: Serial, SPI
• Supply Voltage Max: 5.5V
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: MCP3909EV-MCU16 - EVALUATION BOARD FOR MCP3909MCP3909RD-3PH1 - REF DESIGN MCP3909 3PH ENGY MTR
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

2.5
.
FIGURE 2-6:
© 2009 Microchip Technology Inc.
JP4
JP5
JP6
1
1
1
1
N
PC
PB
PA
POWER SUPPLY
1
2
3
4
1
2
3
4
The power supply used in this design provides 3.3V and 5V. Since the energy meter for
a 3-phase 4-wire system is required to operate properly when any one phase is active,
a switching power supply module is used for convenience. T4 is the switching power
supply module.
Prior to the input of this module, additional protection circuitry is included with the meter
design. Figure 2-6 shows the input to the switching power supply module and the
additional filtering and protection circuitry. In Figure 2-6, R
bead, C
to improve anti-surge performance of the system.
Switching Power Supply Module (T4) and Additional Input Protection Circuitry.
R5
COILS
T4
A
B
C
N
N
C
B
A
1
, C
4
, C
Vo2
Vo1
G2
G1
A
B
C
N
6
, RV1, RV2 and RV3 are C
8
7
6
5
8
7
6
5
12V
C1
0.1U
+ C2
100uf
RV1
BB
Hardware Description
capacitors and varistors. They are used
C4
0.1u
JP6
Header 3
1
2
3
RV2
5
is the integrated ferrite
C6
0.1u
DS51723A-page 25
N
RV3
PA
PB
PC
N