71M6542F-IGT/F Maxim Integrated Products, 71M6542F-IGT/F Datasheet - Page 102

• Manufacturer Part Number: 71M6542F-IGT/F
• Description: PMIC Solutions Precision Energy Meter IC
• Manufacturer: Maxim Integrated Products
• Type: Metering SoCr

Specifications of 71M6542F-IGT/F

• Core: 8051
• Core Architecture: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 5 KB
• Device Million Instructions Per Second: 5 MIPS
• Interface Type: I2C, ICE, SPI, UART
• Maximum Clock Frequency: 5 MHz
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Number Of Programmable I/os: 51
• Number Of Timers: 2
• On-chip Adc: 22 bit
• Operating Supply Voltage: 3 V to 3.6 V
• Package / Case: LQFP-100
• Processor Series: 8051
• Program Memory Size: 64 KB
• Program Memory Type: Flash
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

to ground.
4.12 Connecting the Reset Pin
Even though a functional meter does not necessarily need a reset switch, it is useful to have a reset
pushbutton for prototyping as shown in
V3P3SYS (functional in MSN mode only), V3P3D (MSN and BRN modes), or VBAT (all modes, if a
battery is present), or from a combination of these sources, depending on the application.
Since the 71M6541D/F and 71M6542F generate their own power-on reset, a reset button or circuitry, as
shown in
4.13 Connecting the Emulator Port Pins
Even when the emulator is not used, small shunt capacitors to ground (22 pF) should be used for
protection from EMI as illustrated in
102
Figure 42: External Components for the RESET Pin: Push-Button (Left), Production Circuit (Right)
V3P3D
VBAT/
For a production meter, the RESET pin should be protected by the external components shown in
Figure
Figure
42, right side. R1 should be in the range of 100Ω and mounted as closely as possible to the IC.
1k Ω
42, is only required for test units and prototypes.
R
2
0.1µF
Switch
Reset
71M654x
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Figure 41: Connection for Optical Components
OPT_RX
OPT_TX
R
Figure
V3P3D
10kΩ
1
Figure
100 pF
43. Production boards should have the ICE_E pin connected
42, left side. The RESET signal may be sourced from
RESET
GNDD
71M654x
10 kΩ
R
2
V3P3SYS
R
LED
Phototransistor
1
V3P3SYS
R
R
100Ω
100Ω
1
1
GNDD
RESET
RESET
DGND
DGND
71M654x
71M6533
71M6533
v1.1