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SOM37 Hardware Design Guide

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SOM37 Hardware Design Guide SOM37X Hardware Design Guide Content 1 Introduction ....................................................................................................................... 3 2 Change History .....................................................

SOM37 Hardware Design Guide
SOM37X Hardware Design Guide Content 1 Introduction ....................................................................................................................... 3 2 Change History .................................................................................................................. 3 2.1 Change History ........................................................................................................... 3 3 SOM37x Overview ............................................................................................................. 3 3.1 more information about SOM37x .............................................................................. 3 4 Power supply ..................................................................................................................... 4 4.1 Power net descriptions .............................................................................................. 4 4.2 Power on sequence .................................................................................................... 4 5 Module Configuration and Initialization ........................................................................... 5 5.1 Module Reset ............................................................................................................. 5 5.2 Module Configuration and control pins ..................................................................... 5 5.3 Boot Modes ................................................................................................................ 6 6 Peripherals ......................................................................................................................... 7 6.1 DSS and McSPI ............................................................................................................ 7 6.2 GPMC .......................................................................................................................... 7 6.3 HSUSB ......................................................................................................................... 8 6.4 I2C ............................................................................................................................... 9 6.5 MMC ........................................................................................................................... 9 6.6 UART ......................................................................................................................... 10 6.7 JTAG .......................................................................................................................... 10 7 4 x50 pin expansive connector of SOM37x ..................................................................... 10 Table Content Table 1 : Change History ........................................................................................................... 3 Table 2 : Power net descriptions .............................................................................................. 4 Table 3 : Control nets ................................................................................................................ 6 Table 4 : normal boot sequence from multiple source ........................................................... 6 Figure Content Figure 1 : Power on sequence .................................................................................................. 5 Figure 2 : Reset circuit connections ......................................................................................... 5 Figure 3 : boot configuration circuit ......................................................................................... 6 Figure 4 : DSS bus circuit .......................................................................................................... 7 Figure 5 : GPMC bus application circuit ................................................................................... 8 Figure 6 : OTG application circuit ............................................................................................. 8 Figure 7 : HSUSB bus application circuit .................................................................................. 8 Figure 8 : I2C and FRAM ........................................................................................................... 9 Figure 9 : MMC bus application circuit .................................................................................... 9 Figure 10 : UART application circuit ....................................................................................... 10 Figure 11 : JTAG connector ..................................................................................................... 10 Figure 12 : 4 x50 pin expanded connector of SOM37x-A1 .................................................... 11 Figure 12 : 4 x50 pin expanded connector of SOM37x-B2 .................................................... 11 1 Introduction This document is the Hardware design guide for the SOM37x. This document provides detailed information on the overall design and usage of the SOM37x from the system level perspective. It is not intended to provide detailed documentation of the processor or any other component used on the board. It is expected that the user will refer to the appropriate documents for these devices to access detailed information. 2 Change History 2.1 Change History Table 1 tracks for the changes made for each revision of this document. Table 1 : Change History Revision Changes Date By A1 Initial release 2011-03-30 Chalay A2 Update USB application schematic 2011-9-23 Chalay A3 Add 2011-12-16 Chalay 3 SOM37x Overview The SOM37x module based on TI’s AM/DM37x processor family is a embedded SOM (system on module) designed by EMA-Tech. SOM37x support Linux-2.6.31、WinCE6.0、Android and other embedded operating system. SOM37x provides a mass of software resources such as DVSDK, OpenGL ES2.0, OGRE and etc. The SOM37x module use TPS65951 as PMIC and Package-on-a-Package (PoP) Combination Memory which includes NAND Flash and LP-DRAM as memory storage. The NAND Flash and LP_DRAM are compatible with other Combination memory from Micron, the density of NAND Flash is up to 1GB, and the LP_DRAM up to 256MB. 3.1 more information about SOM37x For information about SOM37x, please see the document SOM37X User Manual provided by EMA-TECH, the SOM37X User Manual describes electrical specifications, connector specifications and etc. You can get the SOM37X User Manual from EMA-TECH, please contact EMA’s Technical Support. If you need more information about AM/DM37x and TPS65951, please refer to www.Ti.com for more information. 4 Power supply 4.1 Power net descriptions The SOM37x has several power net, please refer to Table 3 for details. All the signal in the table 2 are all connected to TPS65951. Table 2 : Power net descriptions NET Voltage Direction VDD_SOM 3.3V I VDD_IO 1.8V O VDD_MMC1 3V/1.8V O VBUS_HSUSB0 5V O VDD_RTC 3V I VDD_AUX2 1.8V O VDD_SOM : The main power source to SOM37x, it is connected to the PMIC TPS65951. VDD_IO : This signal is the reference voltage of IO net , it is just designed to provide a reference voltage for level shifter and can’t be used as 1.8V power supply. VDD_MMC1 : The power supply for MMC1 card, it provide 1.8V/3.3V power supply just when the SOM37x is configured to boot from MMC1 card. VBUS_HSUSB0 : The power supply for HSUSB0(OTG), it provide 5V(100mA max) power supply just when the SOM37x is configured to boot from HSUSB0. VDD_RTC : The backup battery supply. VDD_AUX2 : VAUX2 LDO output voltage supply. 4.2 Power on sequence Figure 1 shows the power on sequence of SOM37x. VDD_SOM T2.PWR_ON T2.REGEN VDD_IO SYS_nRESWARM T2.SYSEN SYS_nRESPWRON 1068 μs - 3 MHz oscillator setting + clock switch Pulled up by VDD_IO power net with 10K resister 29.114 ms – Output signal enable the processor Pulled up by VDD_SOM power net with 10K resister 4608 μs battery detection 4536μs - System Enable Figure 1 : Power on sequence T2.PWR_ON is pulled up with 10K resister internal and SOM37x boots automatically when VDD_SOM power supply is detected. T2.PWR_ON should be NC when this control signal is not used in design. SYS_nRESPWRON is the reset signal of AM/DM3730, Using this pin carefully is recommended. 5 Module Configuration and Initialization 5.1 Module Reset There are one way to reset the SOM37x and these are described in the SOM37X User Manual. The 2 external resets, SYS_nRESPWRON and SYS_nRESWARM. SYS_nRESPWRON is the reset open-drain input/output signal and pull up with 4.7K resister. SYS_nRESPWRON is connected to AM/DM3730 input pin directly, and controlled by the output signal nRESPWRON of TPS65951 indirectly. In the hardware design, the designer can use this reset signal to reset the SOM37x and reset the component on the baseboard at power on sequence of SOM37x. SYS_nRESWARM is the warn reset come out from AM/DM3730, this signal should be used to reset output signal. Refer to TI’s AM/DM37x TRM for further information on using this two signals. Figure 2 shows the reset circuit connections Figure 2 : Reset circuit connections 5.2 Module Configuration and control pins Refer to AM/DM37x TRM for more configuration and control pin information. Device nRESET SOM37x SYS_nRESPWRON SYS_nRESWARM Reset button Table 3 : Control nets NET Voltage Direction SYS_nRESPWRON 1.8V I/O SYS_nRESWARM 1.8V I/O T2.PWR_ON 3.3V I T2.REGEN 1.8V O T2.SYSEN 1.8V O T2.USBCHRG_ENZ 1.5V(VPRECH) O T2.USBCHRG_STATZ 1.5V(VPRECH) I T2.CHRG_DET_N 1.5V(VPRECH) O T2.MANU_BRIX 1.8V O SYS_BOOT[5:0] 1.8V I 5.3 Boot Modes The AM/DM37x provides the option of booting from multiple sources. The boot mode is controlled by the SYS_BOOT pins of the processor. Six external pins (sys_boot[5:0]) are used to select interfaces or devices for booting. Table 4 shows the normal boot sequence from multiple source. Refer to AM/DM37x TRM for more boot configuration information. Table 4 : normal boot sequence from multiple source OMAP35x Processor Pins Boot Method Default SYS_BOOT[5:0]= 101111 USB, UART3,MMC1,NAND Alternate SYS_BOOT[5:0]= 001111 NAND, USB, UART3,MMC1 Alternate SYS_BOOT[5:0]= 001110 XIPwait, DOC,USB, UART3,MMC1 Alternate SYS_BOOT[5:0]= 000110 MMC1 USB Figure 4 shows the boot configuration circuit designed by EMA. Figure 3 : boot configuration circuit 6 Peripherals The AM/DM37x multiple media processor a mass of peripheral and the SOM37x lead out of all signal. Each peripheral section includes recommendations on how to handle pins on interfaces. Refer to AM/DM37x TRM or contact us to to get more information about how to use the SOM37x. 6.1 DSS and McSPI Figure 5 shows the DSS and McSPI bus application circuit, in this circuit, two ic level shifter and a AD converter are used for DSS, the McSPI bus is connected to touch screen controller. Figure 4 : DSS bus circuit 6.2 GPMC Figure 5 shows the application circuit of GPMC bus, this circuit connect the Ethernet IC and the SOM37x through GPMC bus. Figure 5 : GPMC bus application circuit 6.3 HSUSB Figure 6 shows the OTG bus application circuit. Figure 6 : OTG application circuit Figure 7 shows the HSUSB bus application circuit. Figure 7 : HSUSB bus application circuit This circuit is the USB part of the board SBC3530_B2 of EMA, it fix two issues of the board SBC3530_B1. ISSUE 1. USB failure on CON9. This issue relates to the intermittent failure of both USB ports on CON9. It appears on all tested boards. This problem occurs only on system boot up and does not occur during system operation i.e. if the system is already running this error does not occur. ISSUE 2. USB failure on CON8 and CON9. This issue is apparent on a number of boards. During system operation, USB functionality will fail on CON8 and CON9 and an error message is displayed over the serial connection (see attached system log file). This error will usually occur after approximately 1 minute of operation on the board. It has been observed that plugging a USB storage device into CON8 or CON9 can possibly induce the failure, but this has not been confirmed. After a time period the USB functionality is available. The time period varies from 5 mins to 20 mins upwards. During this time the system is slow in operation. About more details charged between SBC3530_B1 and SBC3530_B2, please refer to these two schematics. 6.4 I2C Figure 8 : I2C and FRAM 6.5 MMC Figure 9 : MMC bus application circuit 6.6 UART Figure 10 : UART application circuit 6.7 JTAG Figure 11 : JTAG connector 7 4 x50 pin expansive connector of SOM37x SOM37x use 4 board-to-board connector as the expansive connector, 50 pin connector are all used. See figure 13 for the signal assignment of each pin or see the document SOM37X User Manual for more details of signal descriptions. Figure 12 : 4 x50 pin expanded connector of SOM37x-A1 Figure 13 : 4 x50 pin expanded connector of SOM37x-B2
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