71m6541g-igtr/f Maxim Integrated Products, Inc., 71m6541g-igtr/f Datasheet - Page 102
71m6541g-igtr/f
Manufacturer Part Number
71m6541g-igtr/f
Description
71m6541d/71m6541f/71m6542f Energy Meter Ics
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
1.71M6541G-IGTRF.pdf
(165 pages)
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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
© 2008–2011 Teridian Semiconductor Corporation
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
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