Texas Instruments Sitara AM335x User manual

AM335xStarterKitHardwareUsersGuide 1

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.

AM335xStarterKitHardwareUsersGuide 2

Top view

Figure 1: TMDSSK3358 Top view

Bottom view

AM335xStarterKitHardwareUsersGuide 3

Figure 2: TMDSSK3358 V1.2A Bottom View

System view

Figure 3: TMDSSK3358 System View

AM335xStarterKitHardwareUsersGuide 4

Schematics/Design Files

• HW Documentation [1] - 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.

AM335xStarterKitHardwareUsersGuide 5

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

AM335xStarterKitHardwareUsersGuide 6

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.

AM335xStarterKitHardwareUsersGuide 7

Board Identity Memory

The board contains a serial EEPROM with the board specific data which allows the processor to automatically detect

which board is connected and the version of that board. Other hardware specific data can be stored in this memory as

well. The part number of the memory device used is CAT24C256WI-GT3. See the Configuration/Setup section for

details on the data in this memory.

Name Size Contents

Header 4 MSB 0xEE3355AA LSB

Board Name 8 Name for board in ASCII “A335X_SK” = AM335x TMDSSK3358Board

Version 4 Hardware version code for board in ASCII “1.2A” = rev. 01.2A

Serial Number 12 Serial number of the board. This is a 12 character string which is: WWYY4P19nnnn where: WW = 2 digit week of the

year of production YY = 2 digit year of production nnnn = incrementing board number

Configuration

Option

32 Codes to show the configuration setup on this board. For the available EVM’s supported, the following codes are used:

ASCII “SKU#00” = default configuration Remaining 26 bytes are reserved

Available 32720 Available space for other non-volatile codes/data

Table 3:I2C Configuration

SD/MMC0

The Micro SD/MMC0 port is provided with a card socket SCHA5B0200. This is a standard Micro SD/MMC Card

type of connector which is of the low profile compact type. It is connected to the MMC0 port of the AM335x

processor. Check the AM335x data sheet and TRM for supported card types/densities.8Gb SD cards are tested with

this design. The Pin assignment is as given below.

Pin No Memory Card PIN No.

uSD#1 DAT2

uSD#2 CD/DAT3

uSD #3 CMD

uSD #4 VCC

uSD #5 CLK

uSD #6 GND

uSD #7 DAT0

uSD #8 DAT1

uSD #9 GND

uSD #10 CD

Table 4: SD/MMC0 Connector Pin Details

Ethernet

TMDSSK3358 has two Giga bit Ethernet transceivers. AR8031-AL1A from Atheros is used as a single port, tri

speed PHY. A single 3.3V is enough to power this PHY and the other voltages required were generated internally.

Reset for both the chips are driven by the SYS_WARMRESETn signal through a SN74LVC1G07 buffer.Both the

PHYs have individual 25MHz, 50ppm crystal as their clock source. The 25MHz Clock out of the EMAC1-PHY port

has been connected to the XTLI of the EMAC2-PHY as an optional clock input.

AM335xStarterKitHardwareUsersGuide 8

For both the PHYs, mode selection pins MODE [3:0] are set as “0000” to operate it in 1000 BASE-T, RGMII mode.

The PHY address for the EMAC1-PHY and EMAC2-PHY are 00100 and 00101 respectively.The interrupts from the

both PHYs are connected to both the Non Maskable Interrupt pin and to the processor GPIO pins.

The Wake On LAN interrupts from the both PHYs are connected to the EXT_WAKEUP signal of the processor as

an option.

Pin No Signal Name Description

1 DGND Ground

2 NC No connect

3 ETHER_D3P MDI 3 POSITIVE

4 ETHER_D3N MDI 3 NEGATIVE

5 ETHER_D2P MDI 2 POSITIVE

6 ETHER_D2N MDI 2 NEGATIVE

7 ETHER_D1P MDI 1 POSITIVE

8 ETHER_D1N MDI 1 NEGATIVE

9 ETHER_D0P MDI 0 POSITIVE

10 ETHER_D0N MDI 0 NEGATIVE

D1 PHY_ LED_ACTn PHY ACTIVITY LED signal

D2 GND Ground

D3 GND Ground

D4 PHY_ LED_1000n 1000 Base-T LINK LED signal

Table 5: 10/100 PRU Ethernet1 Pin Details

USB

USB to UART/JTAG

Micro AB USB port is provided as an upstream port of the USB HUB USB2412. This is used for USB to JTAG and

USB to UART conversion applications through the downstream port 1 of the HUB. FT2232L is used for the USB to

UART and JTAG conversion applications. The Downstream port 2 of the Hub is connected to USB port 0 of the

AM335x.

The USB to UART/JTAG converter (FT2232L) has 32 configurable multifunction pins. A 16 bit, serial EEPROM

93LC56B from MicroChip is used to store the configuration data. Some of the pins from ADBUS [7:0] and ACBUS

[7:0] are configured as JTAG and Reset signals. These JTAG pins from the FT2232 IC are connected to the

dedicated processor JTAG pins and as well to the optional JTAG connector.

The Micro AB USB pin out details are provided below.

AM335xStarterKitHardwareUsersGuide 9

Pin No Signal Name Description

1 USB_DC USB BUS VOLTAGE

2 USBDM_UP USB DATA MINUS

3 USBDP_UP USB DATA PLUS

4 NC (USB_ID) No connect

5 DGND Ground

Table 6: Micro AB – USB0

USB 1

The USB port1 of the AM335x is connected to the USB type A connector. USB power (5V )is provided to this

connector through a buck-boost converter circuit.

Pin No Signal Name Description

1 VUSB_VBUS1 USB BUS VOLTAGE

2 USB1_CONN_DM USB1 DATA MINUS

3 USB1_CONN_DP USB1 DATA PLUS

4 DGND Ground

Table 7: USB A Type – USB1

Audio Codec

The TLV320AIC3106 is a low-power stereo audio codec with stereo headphone amplifier from TI. CLKOUT1 of

the processor is sourcing the master clock of the codec (24Mhz). The CODEC I2C is capable of supporting both the

standard and fast modes. I2C address of the codec is configured as 0011011. MCASP1 interface of the processor is

connected to the audio interface of the codec. The stereo audio output is terminated in a stereo headphone Jack. The

Pinout assignments for the headset jack are provided below.

Pin No Signal Description

1 AGND_AUD Analog Ground

3 HS_SPKRP Headset stereo LOUT

10 NC No Connect

2 HD_SPKRP Headset stereo ROUT

Table 8: Headset Jack

WLAN

LBEE5ZSTNC-523 Type TN WiFi / BT Module from Murata is used to provide the WLAN and the Bluetooth

connectivity for the TMDSSK3358 design. The WLAN design has IEEE802.11 b, g, n compliance for WLAN and

Version4.0 with Blue tooth Low Energy (BLE) for BT. This module requires an external 32.768 KHz, +/-150ppm

clock. This is sourced by the CLKOUT2 clock out pin of the processor. The required digital interfaces for the

module are connected to the UART1 and McASP0 ports of the processor through voltage level converters.

Note that due to a HW bug in the WiFi Antenna matching network design, customers may observe significant

degradation in throughput (15-20 Mbps - Typical) as well as reduced WiFi Range when using the AM335x Starter

Kit and COM6M module with AM335-EVM, with the onboard WiFi Antenna.

AM335xStarterKitHardwareUsersGuide 10

For optimal throughput we recomend using an external Antenna as describe in the link:<ECO for using external

antenna> [2]

Warning: To minimize risks of potential radiation hazards associated with handling and/or moving the

energized EVM including compliance with the wireless radio grant licensing provisions, always maintain a

minimum distance of 20cm measured between EVM user(s) and the EVM antenna.

User LEDs

The Four User LEDs implemented are D1-D4 in the user panel area. These are driven by the GPIOs from the

AM335x.

All the user LEDs are green in color.

User Keys

This design has 4 user keys SW1,SW2,SW3 & SW4, three of them connected directly to the GPIO bank2 of the

processor (Keys 2,3 & 4) and one of them (Key 1) connected to the GPIO bank0 of the processor.

Apart from the above four user keys, the design also has a button to interrupt the processor via the non maskable

interrupt pin.

Accelerometer

The LIS331DLH is an ultra low-power high performance three axes linear accelerometer used in TMDSSK3358

board. The accelerometer is mounted closer to the center of the board as to allow the most useful/dynamic data. The

accelerometer is connected via I2C0 of the processor. The I2C(0) address is 0011000b.

Pin Use Description

The Pin use description file provides us the information on the pin functionality mode selected. The pin mux utility

file is found here Pin Mux Data File [3]

GPIO Definitions

See the updated pinmux document Pin Mux Description [4] which shows the use case columns for GPIOs.

Board Expansion Connectors

The SPI0 and the I2C0 ports are extended through the connectors J11 and J8 respectively. SPI0 Expansion header

pinout is provided below.

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