Power Supplies
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3.3 Power Management IC Power Supplies
The AM437x GP EVM uses the TPS65218 power management IC. The I2C0 on AM437x is used to
control the Smart Reflex port and control port on the TPS65218. Table 1 and Table 2 detail the power
supplies used.
Table 1. AM437x Power Supplies from TPS65218
TPS65218 AM437X POWER RAIL VOLTAGE
POWER SUPPLY
VDCDC1 VDD_CORE, VDD_TPM 1.1 V
VDCDC2 VDD_MPU 1.1 V
VDCDC3 VDDS_DDR 1.35 V
VLS1 VDD_DDR 1.35 V
VDDS_CLKOUT, VDDS_OSC, VDDS_SRAM_CORE_BG, VDDS_SRAM_MPU_BB,
VDDS_PLL_CORE_LCD, VDDS_PLL_DDR, VDDS_PLL_MPU, VDDA1P8V_USB0,
V1_8D_AM437X 1.8 V
VDDA1P8V_USB1, VDDS_CTM, VDDS_TPM, VPP, VDDA_MC_ADC, VDDA_TS_ADC,
VDDS, COM8, VDDSHV9, VDDSHV11, tamper, ADC input sections
V1_0BAT CAP_VDD_RTC 1.0 V
V1_8BAT VDDS_RTC 1.8 V
V3_3D_AM438X VDDA_3P3V_USB0, VDDA_3P3V_USB1, VDDSHV1, 2, 3, 4, 5, 6, 7, 8, and 10 3.3 V
V5_0D HDMI circuitry, USB0 power 5.0 V
NOTE: The TPS65218 power management IC that is used on the AM437x GP EVM rev. 1.2 has
several issues that can affect operation. See the errata for the TPS65218 for more details.
3.3.1 Other Power Supplies Used
Table 2. Other Power Supplies
POWER SUPPLY POWER RAIL VOLTAGE
NAND memory, QPSI flash, Ethernet PHY, SDMMC0, board ID memory, ARM JTAG,
buffers of FTDI section, LCD buffer, touch screen, camera module, HDMI buffer, audio
V3_3D 3.3 V
codec, RS-232 sections, COM8 sections, smart card sections, tamper header, platform
test section, GPIO header, printer
V3_3FTDI FT2232 section from TPS79333 3.3 V
LCD power generation, camera module, VCOM_BAT generation for COM8 module,
VBAT 5.0 V
USB1 power generation, platform test section, LEDs, GPIO header, buzzer, printer
V1_2D HDMI section power 1.2 V
3.4 APM Sense Resistors
The AM437x GP EVM has the following subsystems with current sense resistors. These resistors allow
the power to be measured on each power rail to check AM437x power requirements during real-time
software execution. The value of the resistors is selected to provide the best dynamic range when using a
TI INA226 converter. An INA226 converter is installed on the EVM for both the VDD_CORE and
VDD_MPU power supply rails of the AM437x. The other power rails have sense resistors but have their
measurement connections attached to 2-pin standard headers so they can be read easily by a multimeter
or connected to an INA226-converter EVM. The value of the sense resistors for the VDD_CORE and
VDD_MPU were selected to give better dynamic range for active power modes rather than sleep or low
power modes. If power is to be measured for VDD_CORE or VDD_MPU for sleep or low power modes,
then this sense resistor value must be changed to give better shunt voltage values.
6AM437x GP EVM Hardware User's Guide SPRUHW7–June 2014
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