Oled Display; Sd Card; Hibernate, Current Shunts, Power Supplies, Reset And Crystals (Schematic; Hibernate - Texas Instruments Tiva TM4C123G User Manual

www.ti.com

2.2.7 OLED Display

The development board includes a 96 x 64 color Organic LED (OLED) display. The OLED display is
powered from the on-board 13 V regulator, which must be enabled before using the display.
Data is written to the display using the SSI2 peripheral.

2.2.8 SD Card

The DK-TM4C123G features a microSD card slot.
2.3 Hibernate, Current Shunts, Power Supplies, Reset and Crystals (Schematic page 3)

2.3.1 Hibernate

The DK-TM4C123G provides a 32.768 kHz crystal (Y1) as the clock source for the TM4C123GH6PGE's
Hibernation module. Along with a 3.0-V CR2032 lithium coin-cell backup battery that is connected to the
VBAT pin and provides power to the Hibernation module when the microcontroller is in Hibernate mode.
The current draw while in Hibernate mode can be measured indirectly by measuring the voltage across
the 1-kΩ current shunt resistor. See
Several conditions can generate a wake signal to the Hibernate module; waking on a Real-time Clock
(RTC) match, waking on low battery, and/or waking on assertion of the WAKE pin.
switch is connected to the WAKE pin on the microcontroller. When the microcontroller is configured to
wake on WAKE assertion, the switch can be used to wake the part from Hibernate mode. The
SELECT/WAKE switch is also connected to PM4 by way of a diode to prevent PM4 from asserting WAKE
when the part enters Hibernate mode. See
To achieve the lowest power consumption while in Hibernate mode, the HIB signal is connected to the
Channel 1 Enable (EN1) signal of the Texas Instruments TPS2052B load switch (U7). In Hibernate mode,
the HIB signal is asserted and the load switch cuts main power to the entire board, excluding the on-board
ICDI. The Hibernation module is powered solely by the back-up battery.
(1)
If the board does not turn on when you connect it to a power source, the microcontroller might be in Hibernate mode (depending on the
programmed applications). You must satisfy one of the programmed wake conditions and connect the power to bring the microcontroller
out of Hibernate mode and turn on the board.
SPMU357B – August 2013 – Revised March 2014
Submit Documentation Feedback
Hibernate, Current Shunts, Power Supplies, Reset and Crystals (Schematic page 3)
Table 2-9. OLED Display Signals
GPIO Pin Pin Function
PH7 SSI2TX
PH5 SSI2FSS
PH4 SSI2CLK
PH6 GPIO
PG1 GPIO
PG0 GPIO
Table 2-10. SD Card Signals
GPIO Pin Pin Function
PA5 SSI0TX
PA4 SSI0RX
PA3 SSI0FSS
PA2 SSI0CLK
Current Shunt Resistors
Appendix A: Schematics
Copyright © 2013–2014, Texas Instruments Incorporated
Table 2-9 shows the signals used by the display.
OLED Function
SDIN
CS
SCLK
D/C
RST
+13VEN
Table 2-10 shows the signals used with the SD card.
SD Card Function
DI
DO
CS
CLK
for more details.
for details.
The SELECT/WAKE
(1)
13
Hardware Description