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AM1808
SPRS653E – FEBRUARY 2010 – REVISED MARCH 2014
3.7.3 Real-Time Clock and 32-kHz Oscillator
Table 3-5. Real-Time Clock (RTC) and 1.2-V, 32-kHz Oscillator Terminal Functions
SIGNAL
NAME
RTC_XI
RTC_XO
RTC_ALARM / UART2_CTS / GP0[8] / DEEPSLEEP
RTC_CVDD
RTC_V
ss
(1) I = Input, O = Output, I/O = Bidirectional, Z = High impedance, PWR = Supply voltage, GND = Ground, A = Analog signal.
Note: For multiplexed pins where functions have different types (ie., input versus output), the table reflects the pin function direction for
that particular peripheral.
(2) IPD = Internal Pulldown resistor; IPU = Internal Pullup resistor; CP[n] = configurable pull-up/pull-down (where n is the pin group) using
the PUPDENA and PUPDSEL registers in the System Module. The pull-up and pull-down control of these pins is not active until the
device is out of reset. During reset, all of the pins associated with these registers are pulled down. If the application requires a pull-up,
an external pull-up can be used. For more detailed information on pullup/pulldown resistors and situations where external
pullup/pulldown resistors are required, see the
circuits, see the
Device Operating Conditions
(3) This signal is part of a dual-voltage IO group (A, B or C). These groups can be operated at 3.3V or 1.8V nominal. The three groups can
be operated at independent voltages but all pins withina group will operate at the same voltage. Group A operates at the voltage of
power supply DVDD3318_A. Group B operates at the voltage of power supply DVDD3318_B. Group C operates at the voltage of power
supply DVDD3318_C.
3.7.4 DEEPSLEEP Power Control
SIGNAL
NAME
RTC_ALARM / UART2_CTS / GP0[8] / DEEPSLEEP
(1) I = Input, O = Output, I/O = Bidirectional, Z = High impedance, PWR = Supply voltage, GND = Ground, A = Analog signal.
Note: For multiplexed pins where functions have different types (ie., input versus output), the table reflects the pin function direction for
that particular peripheral.
(2) IPD = Internal Pulldown resistor; IPU = Internal Pullup resistor; CP[n] = configurable pull-up/pull-down (where n is the pin group) using
the PUPDENA and PUPDSEL registers in the System Module. The pull-up and pull-down control of these pins is not active until the
device is out of reset. During reset, all of the pins associated with these registers are pulled down. If the application requires a pull-up,
an external pull-up can be used. For more detailed information on pullup/pulldown resistors and situations where external
pullup/pulldown resistors are required, see the
circuits, see the
Device Operating Conditions
(3) This signal is part of a dual-voltage IO group (A, B or C). These groups can be operated at 3.3V or 1.8V nominal. The three groups can
be operated at independent voltages but all pins withina group will operate at the same voltage. Group A operates at the voltage of
power supply DVDD3318_A. Group B operates at the voltage of power supply DVDD3318_B. Group C operates at the voltage of power
supply DVDD3318_C.
20
Device Overview
NO.
J19
H19
F4
L14
H18
Device Configuration
section.
Table 3-6. DEEPSLEEP Power Control Terminal Functions
NO.
F4
Device Configuration
section.
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Product Folder Links:
POWER
(1)
(2)
TYPE
PULL
GROUP
I
—
—
O
—
—
O
CP[0]
A
PWR
—
—
GND
—
—
section. For electrical specifications on pullup and internal pulldown
POWER
(1)
(2)
TYPE
PULL
GROUP
I
CP[0]
A
section. For electrical specifications on pullup and internal pulldown
Copyright © 2010–2014, Texas Instruments Incorporated
AM1808
DESCRIPTION
(3)
RTC 32-kHz oscillator input
RTC 32-kHz oscillator output
RTC Alarm
RTC module core power
(isolated from chip CV
)
DD
Oscillator ground
DESCRIPTION
(3)
DEEPSLEEP power control output
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