8 pin descriptions, 1 power and ground pins, Pin descriptions – Rainbow Electronics 71M6542G User Manual
Page 157: Power and ground pins, Table 118: power and ground pins
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© 2008–2011 Teridian Semiconductor Corporation
157
6.8
Pin Descriptions
6.8.1 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
.
Table 117: Power and Ground Pins
Pin
(64 pin)
Pin
(100-pin)
Name
Type Circuit Description
50
72, 80
GNDA
P
–
Analog ground: This pin should be connected directly to
the ground plane.
42
62
GNDD
P
–
Digital ground: This pin should be connected directly to
the ground plane.
53
85
V3P3A
P
–
Analog power supply: A 3.3 V power supply should be
connected to this pin. V3P3A must be the same
voltage as V3P3SYS.
45
69
V3P3SYS
P
–
System 3.3 V supply. This pin should be connected to a
3.3 V power supply.
41
61
V3P3D
O
13
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.
40
60
VDD
O
–
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.
57
89
VLCD
O
–
The output of the LCD DAC. A 0.1 µF bypass
capacitor to ground should be connected to this pin.
46
70
VBAT
P
12
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.
47
71
VBAT_RTC
P
12
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.