78M6612-IGTR/F Maxim Integrated Products, 78M6612-IGTR/F Datasheet - Page 72
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78M6612-IGTR/F
Manufacturer Part Number
78M6612-IGTR/F
Description
IC POWER MEASUREMENT AC 64-LQFP
Manufacturer
Maxim Integrated Products
Datasheet
1.78M6612-IMF.pdf
(111 pages)
Specifications of 78M6612-IGTR/F
Mounting Style
SMD/SMT
Package / Case
LQFP-64
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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78M6612 Data Sheet
Even though a functional power and measurement unit will not necessarily need a reset switch, it is
useful to have a reset pushbutton switch for prototyping, as shown in
signal may be sourced from V3P3SYS (functional in MISSION mode only), V3P3D (MISSION and
BROWNOUT modes), VBAT (all modes, if battery is present), or from a combination of these sources,
depending on the application. For a production unit, the RESET pin should be protected by the external
components shown in
as possible to the IC. The RESET pin can also be directly connected to ground.
3.12 Connecting the Emulator Port Pins
Capacitors to ground must be used for protection from EMI. Production boards should have the ICE_E
pin connected to ground.
If the ICE pins are used to drive LCD segments, the pull-up resistors should be omitted, as shown in
Figure
It is important to bring out the ICE_E pin to the programming interface in order to create a way
for reprogramming parts that have the Flash SECURE bit (SFR 0xB2[6]) set. Providing access to
ICE_E ensures that the part can be reset between erase and program cycles, which will enable
programming devices to reprogram the part. The reset required is implemented with a watchdog timer
reset (i.e. the hardware WDT must be enabled).
72
V3P3
V3P3
D
D
VBAT/
Figure 37: External Components for RESET: Development Circuit (Left), Production Circuit
Since the 78M6612 generates its own power-on reset, a reset button or circuitry, as shown in
Figure
38, and 22 pF capacitors to GNDD should be used for protection from EMI.
37, left side, is only required for test units and prototypes.
1k Ω
1k Ω
R
R
2
2
1nF
1nF
Figure
Switch
Switch
Reset
Reset
GND
GND
V3P3
V3P3
37, right side. R
Figure 36: Voltage Divider for V1
R
R
V3P3
V3P3
D
D
10k Ω
10k Ω
1
1
R
R
1
1
1
R
R
should be in the range of 100 Ω and mounted as closely
2
2
(Right)
RESET
DGND
DGND
78M6612
5kΩ
5kΩ
R
R
3
3
100pF
100pF
C
C
1
1
Figure
R
R
100 Ω
100
1
1
37, left side. The RESET
V1
V1
RESET
DGND
78M6612
DS_6612_001
Rev. 1.2
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