71M6541F Maxim, 71M6541F Datasheet - Page 158

• Manufacturer Part Number: 71M6541F
• Description: The 71M6541D/71M6541F/71M6541G/71M6542F/71M6542G are Teridian™ 4th-generation single-phase metering SoCs with a 5MHz 8051-compatible MPU core, low-power RTC with digital temperature compensation, flash memory, and LCD driver
• Manufacturer: Maxim

71M6541D/F/G and 71M6542F/G Data Sheet
6.9
6.9.1 Power and Ground Pins
Pin types: P = Power, O = Output, I = Input, I/O = Input/Output.
The circuit number denotes the equivalent circuit, as specified under
.
158
(64 pin)
Pin
50
42
53
45
41
40
57
46
47
Pin Descriptions
(100-pin)
72, 80
Pin
62
85
69
61
60
89
70
71
Name
GNDA
GNDD
V3P3A
V3P3SYS
V3P3D
VDD
VLCD
VBAT
VBAT_RTC
Type Circuit
Table 119: Power and Ground Pins
O
O
O
P
P
P
P
P
P
13
12
12
–
–
–
–
–
–
Description
Analog ground: This pin should be connected directly to
the ground plane.
Digital ground: This pin should be connected directly to
the ground plane.
Analog power supply: A 3.3 V power supply should be
connected to this pin. V3P3A must be the same
voltage as V3P3SYS.
System 3.3 V supply. This pin should be connected to a
3.3 V power supply.
Auxiliary voltage output of the chip. In mission mode,
this pin is connected to V3P3SYS by the internal
selection switch. In BRN mode, it is internally
connected to VBAT. V3P3D is floating in LCD and
sleep mode. A 0.1 µF bypass capacitor to ground
must be connected to this pin.
The output of the 2.5V regulator. This pin is powered
in MSN and BRN modes. A 0.1 µF bypass capacitor to
ground should be connected to this pin.
The output of the LCD DAC. A 0.1 µF bypass
capacitor to ground should be connected to this pin.
Battery backup pin to support the battery modes (BRN,
LCD). A battery or super-capacitor is to be connected
between VBAT and GNDD. If no battery is used,
connect VBAT to V3P3SYS.
RTC and oscillator power supply. A battery or super-
capacitor is to be connected between VBAT and
GNDD. If no battery is used, connect VBAT_RTC to
V3P3SYS.
6.9.4 I/O Equivalent
Circuits.
Rev 2