Texas Instruments Sitara AM335x User Manual

AM335xStarterKitHardwareUsersGuide

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AM335xStarterKitHardwareUsersGuide

AM335x Starter Kit Hardware User Guide

Introduction

This document provides the design information on the AM335x processor based Starter Kit (TMDSSK3358) to

users.

Description

The AM335x Starter Kit (TMDSSK3358) can be used as an evaluation and development platform for low cost

AM335x based solutions and networking platforms. The embedded emulation logic allows emulation and debug
using standard development tools such as TI’s Code Composer Studio by just using the supplied USB cable. It is not

intended for use in end products. All of the design information is freely available and can be used as the basis for the

development of an AM335x based product.

EVM System View

TMDSSK3358 is partitioned into two different boards: the main board (processor, peripherals & the main power

supply) and the LCD Carrier board (LCD and touch screen). The TMDSSK3358 main board and the LCD carrier

board mounted are mounted together using 10mm standoffs. The TMDSSK3358 main board has dimensions of

5.257” x 2.798 “and that of the LCD Carrier board is 4.963” x 2.798 “. The Top and the Bottom side views of the

TMDSSK3358 are shown in the pictures provided below.

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Top view

Figure 1: TMDSSK3358 Top view

Bottom view

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Figure 2: TMDSSK3358 V1.2A Bottom View

System view

Figure 3: TMDSSK3358 System View

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Schematics/Design Files

• HW Documentation

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- Schematics, Design Files, and other related HW Documentation

Functional Block Diagram

This section describes about the major functional blocks of the TMDSSK3358. The Functional block diagram of the

TMDSSK3358 design is shown below.

Figure 4: TMDSSK3358 Block Diagram

Processor

The AM3358ZCZ processor is the central processor for TMDSSK3358. All the resources on the board surround the

AM3358 processor to provide development capabilities for hardware and software. See the AM3358 datasheet and

TRM for the details about the processor.

There are system configuration signals, SYSBOOT, that can be set on the EVM to define some startup parameters on

the AM335x processor. See the Configuration/Setup section later for more details.

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Clocks

The main clock for the processor is derived from a 24MHz crystal. An on-board oscillator in the AM3358 generates

the base clock and subsequent module clocks as needed within the AM3358 processor. A 32kHz clock for the RTC

on the AM3358 is derived from a 32kHz crystal on board.

Reset Signals

Power On Reset to the AM335x is driven by the PMIC. SYS_ WARMRESETn is a signal running to several

peripherals and AM335x which performs a reset on those peripherals. SYS_WARMRESETn is asserted by a

pushbutton on the main board and is used to force a reset of the AM335x. AM335x can also pull down on the

RESET_INOUTn signal to cause the SYS_ WARMRESETn line to go active. The RTC_PORZ reset signal for the

RTC section is derived using AND Gates.

Power

The power input to TMDSSK3358 is from a 5V Power Supply. This 5V power is provided as power input to the

Power Manager TPS65910A3. The power requirements of the processor are taken care of by the Power Manager IC

TPS65910A3. The Power ON LED "D5" is ON if the PMIC output power VAUX33 is available ( to indicate the

active status of the PMIC). The power sequencing requirements of the AM335X processor (see the AM335x

datasheet) are handled automatically by the TPS65910A3 PMIC.

Note: When powering the TMDSSK3358 EVM, always use the supplied power supply (CUI/V-Infinity Part

Number EMSA050300-P6P-SZ, Model 3A-182WP05) or equivalent model having output voltage of +5VDC

and output current max 3.0 Amps.

Power Management IC

TMDSSK3358 uses the TPS65910A3 power management IC. The I2C0 on AM335x is used to control the

TPS65910A PMIC.

The PWRON input of PMIC is connected to an external push-button. The built-in debouncing time defines a

minimum button press duration that is required for button press detection. Any button press duration which is lower

than this value is ignored, considered an accidental touch.

For AM335x, the following power supplies from the TPS65910A are used.

TPS65910 Power Supply/Other sources AM335x Power Rail Voltage

VAUX2 (300mA) VDDSHV6 (300mA) 3.3V

VMMC (300mA) VDDSHV2,3,4,5 (300 mA), VDDA3P3V_USB0/1 (10 mA) 3.3V

VDD2 SMPS (1500mA) VDD_CORE (1000mA) 1.1V

VDD1 SMPS (1500mA) VDD_MPU (1500mA) 1.2V

No supply needed VDD_RTC 1.1V

VRTC (External LDO) VDDS_RTC (10mA) 1.8V

VIO_SMPS (1000mA) VDDS_DDR (200mA) 1.5V

VIO_SMPS (1000mA) DDR_VREF (10mA) 0.9V

VDAC (150mA) VDDS (100mA) 1.8V

VDIG1 (300mA) VDDSHV1 1.8V

VDIG2 (300mA) VDDS_SRAM_CORE_BG (40mA) 1.8V

VDIG2 (300mA) VDDS_SRAM_MPU_BB (40mA) 1.8V

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VDIG2 (300mA) VDDS_PLL_DDR (25mA) 1.8V

VDIG2 (300mA) VDDS_PLL_CORE_LCD (25mA) 1.8V

VDIG2 (300mA) VDDS_PLL_MPU (25mA) 1.8V

VDIG2 (300mA) VDDS_OSC (10mA) 1.8V

VAUX1 (300mA) VDDA1P8V_USB0/1 (50mA) 1.8V

VPLL (50mA) VDDA_ADC 1.8V

VDD3 SMPS (100mA) Not Used -

Table 1: Power supplies to AM335x from TPS65910A3 PMIC

Configuration/Setup

Boot Configuration

Various boot configurations can be set using the pull up / down resistor combinations provided on the SYS_BOOT

pins (LCD_DATA0..15).Boot configuration pins are latched upon de-assertion of PORz pin.

I2C Port Address Assignments

Information on I2C address assignments are provided below.

AM335x STARTER KIT (TMDSSK3358) Function AM335x I2C Port Address

Baseboard ID memory I2C0 0x50

AM355x PMIC Control I2C0 0x2D

AM355x PMIC Smart Reflex Control I2C0 0x12

Accelerometer Control I2C0 0x18

Audio Codec I2C0 0x1B

Capacitive Touch screen I2C0 0x38

Table 2:I2C Bus Addresses

Memories Supported

The TMDSSK3358 design supports on-board memories like DDR3 SDRAM and Board ID EEPROM. It also

supports an SD card socket.

DDR3 SDRAM

DDR3 SDRAM memory design is provided by using a 2 Gb single chip solution (MT41J128M16JT-125) from

Micron. It is internally configured as a16 Meg x 16 x 8 bank memory. A separate Regulator to supply the DDR

reference power to the AM335x and the VTT termination voltage to the termination components is provided in the

design. The VIO_SMPS output from the PMIC is programmed to provide the required 1.5V to the DDR3 SDRAM.