Texas Instruments AM437x, User Manual

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Functional Block Description
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4 SPRUII2 – November 2017
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AM437x IDK Evaluation Hardware
2.3 Reset Signals
SYS_RESETn is a reset signal running to several peripherals and the AM437x which performs a reset on
those peripherals. SYS_WARMRESETn is asserted by the push button and used to force a reset of the
AM437x and the other peripherals. The AM437x can also pulldown on the RESET_INOUTn signal to
cause the SYS_RESETn line to go active. The power on reset to the processor is driven from the power
good signal of the power manager.
2.4 Power Supplies
This section describes how the power supplies required for the design are generated.
2.4.1 Power Source
The AM437x Industrial EVM uses an external 24-V power supply. The 24-V power input is converted into
different voltage levels using buck converters, to provide power input to the AM437x and other
peripherals. The power requirements of the processor are handled by the Quad Power Supervisor IC
TPS386000. The power on LED, D2, is on if the 3.3-V power is available. The power sequencing
requirements of the AM437X processor (see the AM437x data sheet) are handled automatically by the
TPS386000 Power Supervisor chip.
2.4.2 Power Management
The AM437x Industrial EVM uses the buck converters and power supervisor IC for power management.
The I2C0 on the AM437x is used to control the TPS62362 buck converter. For the AM437x Industrial
EVM,
Table 1 lists the buck regulators that are used.
Table 1. AM437x Power Supplies From Buck Regulators
Buck Regulator AM437x Power Rail Voltage
TPS5402D (1700 mA) VDDSHV1, 2, 3, 5, 6, 7, 8, 9, 10, 11,
VDDA_3P3V_USB0 and
VDDA_3P3V_USB1 (xxxx mA) 3.3 V (rails that are 3.3 V)
TPS5402D (1700 mA) VDDA_TS_ADC, VDDA_MC_ADC,
VDDS_RTC, VDDS_TPM, VDDS_CTM,
VDDS_CLKOUT, VDDS_OSC,
VDDS_SRAM_CORE_BG,
VDDS_SRAM_MPU_BB,
VDDS_PLL_CORE_LCD,
VDDS_PLL_DDR, VDDS_PLL_MPU,
VDDA1P8V_USB0, VDDA1P8V_USB1
(xxxx mA) 1.8 V (rails that are 1.8 V)
TPS5402D (1700 mA) VDD_DDR and Camera (xxxx mA) 1.5 V
TPS5402D (1700 mA) VDD_CORE, VDD_TPM (xxxx mA) 1.1 V
TPS62362 (3000 mA) VDD_MPU (xxxx mA) 1.2 V
2.4.3 Other Power Supplies
Table 2 lists the other power supplies.
Table 2. Other Power Supplies
Regulator Power Rail Voltage
TPS5402D (1700 mA) VCCB for eQEP (xxxx mA) 5.0 V
LM4132 V1_8DADC 1.8 V