AM1808_12 Datasheet, PDF (20/262 Pages) Texas Instruments – ARM Microprocessor

AM1808
SPRS653C – FEBRUARY 2010 – REVISED DECEMBER 2011
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2.7.3 Real-Time Clock and 32-kHz Oscillator
Table 2-5. Real-Time Clock (RTC) and 1.2-V, 32-kHz Oscillator Terminal Functions
SIGNAL
NAME
TYPE ⁽¹⁾
NO.
PULL ⁽²⁾
POWER
GROUP ⁽³⁾
DESCRIPTION
RTC_XI
J19
I
—
—
RTC 32-kHz oscillator input
RTC_XO
H19
O
—
—
RTC 32-kHz oscillator output
RTC_ALARM / UART2_CTS / GP0[8] / DEEPSLEEP F4
O
CP[0]
A
RTC Alarm
RTC_CVDD
RTC_V_ss
L14 PWR
—
H18 GND
—
—
RTC module core power
(isolated from chip CV_DD)
—
Oscillator ground
(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 electrical specifications on the pull-up and and internal pull-down circuits, see the Device Operating
Conditions section.
(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.
2.7.4 DEEPSLEEP Power Control
Table 2-6. DEEPSLEEP Power Control Terminal Functions
SIGNAL
NAME
TYPE ⁽¹⁾
NO.
PULL ⁽²⁾
POWER
GROUP ⁽³⁾
DESCRIPTION
RTC_ALARM / UART2_CTS / GP0[8] / DEEPSLEEP F4
I
CP[0]
A
DEEPSLEEP power control output
(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 electrical specifications on the pull-up and and internal pull-down circuits, see the Device Operating
Conditions section.
(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.
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