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.

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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 [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.

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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.

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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.

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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.

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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.

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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.