Datasheet

AM1808
SPRS653E –FEBRUARY 2010–REVISED MARCH 2014 www.ti.com
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
POWER
TYPE
(1)
PULL
(2)
DESCRIPTION
GROUP
(3)
NAME NO.
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 module core power
RTC_CVDD L14 PWR — —
(isolated from chip CV
DD
)
RTC_V
ss
H18 GND — — 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 more detailed information on pullup/pulldown resistors and situations where external
pullup/pulldown resistors are required, see the Device Configuration section. For electrical specifications on pullup and internal pulldown
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.
3.7.4 DEEPSLEEP Power Control
Table 3-6. DEEPSLEEP Power Control Terminal Functions
SIGNAL
POWER
TYPE
(1)
PULL
(2)
DESCRIPTION
GROUP
(3)
NAME NO.
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 more detailed information on pullup/pulldown resistors and situations where external
pullup/pulldown resistors are required, see the Device Configuration section. For electrical specifications on pullup and internal pulldown
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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