Texas Instruments DRA76xP-ACD, User Manual, Page: 17 / 38

www.ti.com
Hardware
17 SPRUII5A – December 2017 – Revised November 2018
Submit Documentation Feedback
Copyright © 2017–2018, Texas Instruments Incorporated
DRA77xP/DRA76xP-ACD CPU EVM Board
3.19 User Interface LEDs/Switches
CPU board has four User Interface LEDs for debug, status indication and so on. Details about the User
interface LED and its control are shown in
Table 8 .
Table 8. User LEDs
LED Controlled By
DS2 IO Expander EXP1, position P7
DS3 IO Expander EXP1, position P6
DS4 IO Expander EXP1, position P5
DS5 IO Expander EXP1, position P4
CPU board has four User Interface switches for debug, mode configuration, and so on. Details about the
User interface Switches and its access are shown in
Table 9 .
Table 9. User Switches
Switch Accessed By
SW10.1 IO Expander EXP2, position P2
SW10.2 IO Expander EXP2, position P6
SW10.3 IO Expander EXP2, position P7
SW10.4 IO Expander EXP1, position P15
3.20 Power Monitoring
The CPU board has provisions to monitor power for many of the systems primary power rails. The
measurement system is implemented using the TI INA226 I2C current shunt/power monitors. The INA226
device monitors both power supply voltage and shunt current measurements. Information is connected
from the INA226 devices using dedicated I2C bus(s). The INA226s can be accessed via an off-board
modules (FTDI USART, MSP430, or similar device). There is also the option the access the INA devices
from the SoC processor. To enable, the EVM must be configured to enable I2C2 bus. (Note this requires
loss of HDMI-DDC functionality). Setting IO expander (EXP3, P0) low switches to I2C2 mode (default is
HDMI-DDC). IO expander (EXP3, P3) is then used to select between the 2 different power measurement
buses.
Table 10 shows a mapping of the current monitoring system. INA226 are located at each shunt location.
Table 10. Power Monitor Mapping
I2C BUS A
I2C Addr Power Net Shunt/Resistor Description
0x40 VDD_MPU_AVS 10m- Ω CPU MPU AVS Power Rail
0x41 VDD_GPU_AVS 10m- Ω CPU GPU AVS Power Rail
0x42 VDD_DSPEVE_AVS 10m- Ω CPU DSPEVE AVS Power Rail
0x43 VDD_CORE_AVS 10m- Ω CPU CORE AVS Power Rail
0x44 VDD_IVA_AVS 10m-
Ω
CPU IVA AVS Power Rail
0x45 VDDSHV_3V3 10m- Ω CPU IO power rail (except
VDDSHV8)
0x46 VDDR_MEM_1V35 10m-
Ω
DDR Memory Power Rail
0x47 VDDR_SOC_1V35 10m-
Ω
CPU DDR Power Rail
0x48 VIO_1V8 10m- Ω EVM 1v8 Peripheral Rail
0x49 VDDS_1V8 10m- Ω CPU VDDS Power Rail
0x4A VDDSHV8 10m- Ω CPU IO power rail for VDDSHV8
0x4B VDDA_USB3V3 10m-
Ω
CPU USB3v3 power rail
0x4C VDA_PLL_1V8 10m-
Ω
CPU PLL Power Rail