AT91SAM7A1-EK

AT91SAM7A1-EK Evaluation Board .............................................................................................. User Guide AT91SAM7A1-EK Evaluation Board User Guide 6114A–ATARM–09/04 Table of Contents Section 1 Overview............................................................................................... 1-1 1.1 1.2 1.3 Scope ........................................................................................................1-1 Deliverables ..............................................................................................1-1 AT91SAM7A1 Evaluation Board ...............................................................1-1 Section 2 Setting Up the AT91SAM7A1-EK Evaluation Board ............................. 2-1 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Requirements............................................................................................2-1 Electrostatic Warning ................................................................................2-1 Layout .......................................................................................................2-1 Voltage ......................................................................................................2-2 Powering Up the Board .............................................................................2-2 Measuring Current Consumption on the AT91SAM7A1 ...........................2-2 AT91SAM7A1-EK Block Diagram .............................................................2-3 Section 3 Board Description ................................................................................. 3-1 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 AT91SAM7A1-EK Top Level.....................................................................3-1 AT91SAM7A1 Processor ..........................................................................3-1 Power Supply Block ..................................................................................3-1 Application Interface .................................................................................3-2 CAN Bus ...................................................................................................3-2 LIN Buses and RS-232 Lines....................................................................3-3 Crystal Oscillators and Clock Distribution .................................................3-5 Memory Organization................................................................................3-5 I/O Expansion ...........................................................................................3-6 External Bus Interface...............................................................................3-6 ICE Interface .............................................................................................3-7 Default Strap Configuration.......................................................................3-7 Section 4 Schematics ........................................................................................... 4-1 4.1 AT91SAM7A1-EK Evaluation Board User Guide Schematics ...............................................................................................4-1 i 6114A–ATARM–09/04 Table of Contents ii 6114A–ATARM–09/04 AT91SAM7A1-EK Evaluation Board User Guide Section 1 Overview 1.1 Scope The AT91SAM7A1-EK Evaluation Board enables real-time code development and evaluation. It supports the AT91SAM7A1 microcontroller. 1.2 Deliverables The evaluation board is supplied with: „ an AT91SAM7A1 evaluation board called the AT91SAM7A1-EK „ a bare power lead, a fuse, 2 jumpers „ a 25-pin parallel cable „ the AT91 CD-ROM including: – Summary and full datasheets, datasheets with electrical and mechanical characteristics – Application notes and Getting Started documents for all development boards and AT91 microcontrollers – An AT91 Software package with C and assembly listings is also provided. This allows the user to begin evaluating the AT91 ARM® Thumb® 32-bit microcontroller quickly. 1.3 The board consists of: AT91SAM7A1 Evaluation Board „ The Atmel AT91SAM7A1 ARM-based microcontroller „ Memories – 512 Kbyte 16-bit/8-bit SRAM – 2 Mbyte 16-bit Flash „ Footprint for an 8 Kbyte SPI EEPROM „ Communications interface – 1 CAN port wired on SubD9 connector – 2 LIN ports and 1 RS232 interface – 1 LIN port and 2 RS232 interfaces – 1 LIN port and 1 RS232 modem-compliant interface AT91SAM7A1-EK Evaluation Board User Guide 1-1 6114A–ATARM–09/04 „ Main machine interfaces – 1 LCD (2 lines x 16 characters with backlight) – 1 reset push button – 1 piezoelectric buzzer – 3 LEDs connected to the PIO/Timer module – 3 programmable push buttons „ Miscellaneous – Current measurement possibility – Temperature measurement – Contrast voltage measurement – Configurable straps for flexibility „ ICE interface – A standard 20-pin ICE interface connector – An embedded ICE Interface linked to SubD25 connector „ Power supply features – DC power line filtering – Diode bridge – Adjustable voltage regulators „ Clocks – 6 MHz and 32.768 KHz crystals „ Expansion connectors – Most chip I/Os accessible via two 50-pin connectors (J17, J18) – EBI expansion connector allowing plug-in of memory board or Ethernet board 1-2 6114A–ATARM–09/04 AT91SAM7A1-EK Evaluation Board User Guide Section 2 Setting Up the AT91SAM7A1-EK Evaluation Board 2.1 Requirements In order to set up the AT91SAM7A1-EK Evaluation Board, the following elements are required: „ the AT91SAM7A1-EK Evaluation Board itself „ a DC power supply capable of supplying 7V to 12V @ 400 mA (not supplied) 2.2 Electrostatic Warning The AT91SAM7A1-EK Evaluation Board is shipped in protective anti-static packaging. The board must not be subjected to high electrostatic potentials. A grounding strap or similar protective device should be worn when handling the board. Avoid touching the component pins or any other metallic element. 2.3 Layout Figure 2-1. Top Level Layout AT91SAM7A1-EK Evaluation Board User Guide 2-1 6114A–ATARM–09/04 2.4 Voltage DC power is supplied to the board via the 2.1 mm connector (J1) shown in Figure 2-2. The polarity of the power supply is not critical. The minimum voltage required is 7V. The supply must be isolated from ground. The 0 volts of the on-board regulated supplies can be connected to ground via any one of the 4 test points, TP1 to TP4. Figure 2-2. 2.1mm Connector Positive (+) or Negative(-) The board has a voltage regulator providing +3.3V and another providing +5V. These regulators allow the input voltage to be from 7V to 12V. 2.5 Powering Up the Board Figure 2-3. Powering Up the Board Switch the power on The red LED marked "DS1" lights up No Switch off, check the fuse and the power supply connections Yes End 2.6 Measuring Current Consumption on the AT91SAM7A1 The board is designed to generate the entire power supply of the AT91SAM7A1 device. The PCB power tracks to the ARM7 core, the I/O and the analog cells are independent. This feature enables measurement of the current consumption of the different major parts of the AT91SAM7A1 device. Table 2-1. Current Consumption Measurement Procedure 2-2 6114A–ATARM–09/04 Block to Measure Strap to Unsolder Core E1 Analog Cells E2 I/O Cells E3 Action Connect an ammeter in place of the strap AT91SAM7A1-EK Evaluation Board User Guide 2.7 AT91SAM7A1-EK Block Diagram Figure 2-4. AT91SAM7A1-EK Evaluation Board Block Diagram JTAG Connector Embedded ICE ICE Embedded Connector 32.768 kHz Crystal Osc ARM7TDMI Core AMBA EBI Osc EBI Expansion Connector AT91SAM7A1 Microcontroller SRAM Flash 6 MHz Crystal PLL Voltage Detector Reset Pushbutton 2 Simple Timers SPI Button Generic Interrupt Controller USART1 CAN Driver CAN USART0 Buzzer I/O Expansion Connector DB9 Connector Watchdog CAPT 2 Channels GPT CH0 PWM 4 Channels Contrast Control LCD USART2 PIO AT91SAM7A1-EK Evaluation Board User Guide CH1 Serial EEPROM LIN Driver I/O Expansion Connector Watch Timer LIN Driver RS-232 Driver DB9 Connector RS-232 Driver DB9 Connector LEDs Buttons CH2 8-channel 10-bit ADC Voltage Reference Generator Voltage Measurements 2-3 6114A–ATARM–09/04 2-4 6114A–ATARM–09/04 AT91SAM7A1-EK Evaluation Board User Guide Section 3 Board Description 3.1 AT91SAM7A1-EK The AT91SAM7A1-EK evaluation board consists of eight main blocks. Each block is described in the sections that follow. Top Level The block diagram is shown in Figure 2-4. 3.2 AT91SAM7A1 Processor The processor is based on an ARM7TDMI® 32-bit core and provides „ Standard modules (e.g., timers and USART) „ Specific modules (e.g., CAN) The footprint is for a 144-pin TQFP package. The jumpers E1, E2 and E3 can be removed to allow measurement of the current required by the microcontroller. For more details, refer to Figure 4-3. 3.3 Power Supply Block The voltage regulator provides 3.3V, 5V and analog 3.3V to the board and lights the red LED when operating. Power can be applied via the 2.1 mm connector to the regulator in either polarity because of the diode rectifying circuit. The regulators can tolerate supply transients up to 30V although they shut down without damage if they overheat. The I/O power is configurable. Jumper J3 allows the selection of either 3.3V or 5V. The board also provides jumpers that measure the power of the microcontroller. By unsoldering straps, an ammeter can be connected. Strap E1 is used to measure core consumption. Strap E3 is used to measure I/O cell consumption; the analog cell consumption is measured by jumper E2. For more details, refer to Figure 4-3. AT91SAM7A1-EK Evaluation Board User Guide 3-1 6114A–ATARM–09/04 3.4 Application Interface The board provides the following application interfaces: Table 3-1. Board Application Interfaces Part Description Reset push button Detects and then resets the board when the 3.3V supply voltage drops below 2.7V. Allows manual reset of both board and microcontroller. Red LED DS2 Connected to timer (or I/O) pin TIOA0 (GPT module) Orange LED DS3 Connected to timer (or I/O) pin TIOA1 (GPT module) Green LED DS4 Connected to timer (or I/O) pin TIOB0 (GPT module) SW2 push button SW3 push button Connected to input pins TIOA2 and TIOB1 (or I/O) of the timer (GPT module) SW4 push button Connected to GIC (Generic Interrupt Controller) module IRQ0 input. Allows the user to generate interrupts manually. Buzzer Connected to the PWM0 output. It demonstrates the PWM (Pulse Width Modulation) features. It is possible to enable/disable the buzzer by opening/closing jumper J10. The PWM0 output signal can be a 3V3 or 5V (jumper J3). The voltage influences the volume of the sound. LCD connected to PIO Displays 2 lines of 16 characters each. The LCD is driven by the PIO which can be powered by 3V3 or 5V. The LCD tolerates these two voltages. Users can display messages on the LCD. The contrast voltage is provided by the PWM1 and can be measured by ADC0 channel 0. For more details, refer to Figure 4-3 and Figure 4-4. 3.5 CAN Bus The CAN0 module is connected to a female SubD9 connector (J7) via the CAN driver MN2.The pinout is described in Table 3-2. Figure 3-1. Female DB9 Connector 5 4 9 3-2 6114A–ATARM–09/04 3 8 2 7 1 6 AT91SAM7A1-EK Evaluation Board User Guide Table 3-2. Pinout SubD9 Pin Function 4 CAN-L 3 GND 8 CAN-H others Not connected The CAN bus resistive load is 60 Ohm. It is made up of two 120 Ohm resistors in parallel. The recommended CAN bus load is 60 Ohm. Depending on the external input bus resistor, users can disconnect resistors to achieve the correct bus load. For more details, refer to Figure 4-5. 3.6 LIN Buses and RS-232 Lines Via USART modules, the AT91SAM7A1-EK board provides the following: „ 2 LIN buses and 1 RS-232 line or „ 1 LIN bus and 2 RS-232 lines or „ 2 LIN and 1 RS-232 modem-compliant interfaces Table 3-3. 2 LIN Buses and 1 RS-232 Interface Communication Type Connector AT91SAM7A1 Peripheral Closed Straps Open Straps LIN J19 USART1 No strap No strap LIN J4 USART0 E9: 3 - 4 E9: 2 - 3 RS232 J8 USART2 J9 Table 3-4. 1 LIN Bus and 2 RS-232 Interfaces Communication Type Connector AT91SAM7A1 Peripheral Closed Straps Open Straps LIN J19 USART1 No strap No strap E9: 2 - 3 E9: 3 - 4 E16: 2 -3 E16: 1 - 2 E5: 2 -3 E5: 1 - 2 E6: 2 -3 E6: 1 - 2 RS232 RS232 AT91SAM7A1-EK Evaluation Board User Guide J6 J8 USART0 USART2 J9 3-3 6114A–ATARM–09/04 Table 3-5. 2 LIN Buses and 1 RS-232 Modem-compliant Interface Communication Type Connector AT91SAM7A1 Peripheral Closed Straps Open Straps LIN J19 USART1 No strap No strap LIN J4 USART0 E9: 3 - 4 E9: 2 - 3 USART2 J9 RS232 Modem J8 E16: 1 - 2 E16: 2 - 3 E9: 1 - 2 E16: 2 -3 E5: 1 - 2 E5: 2 -3 E6: 1 - 2 E6: 2 -3 UPIO Note: The UPIO[5:0] are shared between the LCD interface and the RS-232 driver MN1. To avoid signal conflicts, these two devices should not be used at the same time. The RS-232 interfaces are connected to two SubD9 male connectors: „ Connector J6 for the simple RS-232 interface (RX/TX) „ Connector J8 for the RS-232 modem-compliant interface (RX/TX/DSR/CTS, etc.) The pinout for the DB9 connector J6 used by the USART0 is described in Table 3-6. Table 3-6. J6 Pinout Note: J6 Pin Function AT91SAM7A1 Pin (1) 2 RX (Receive Data) RXD0 3 TX (Transmit Data) TXD0 5 Ground GND Others Not connected Not connected 1. Depends on the strap configuration. The pinout for the DB9 connector J8 used by the USART0, USART2 and UPIO[5:0] is described in Table 3-7. Table 3-7. J8 Pinout Note: 3-4 6114A–ATARM–09/04 J8 Pin Function AT91SAM7A1 Pin (1) 1 CD (Carrier Detect) UPIO1/RXD0 2 RX (Receive Data) RXD2 3 TX (Transmit Data) TXD2 4 DTR (Data Terminal Ready) UPIO0/TXD0 5 Ground GND 6 DSR (Data Set Ready) UPIO3 7 RTS (Request to Send) UPIO2 8 CTS (Clear to Send) UPIO4 9 RI (Ring Indicator) UPIO5 1. Depends on the strap configuration. AT91SAM7A1-EK Evaluation Board User Guide Note: Depending on the strap configuration, either SubD9 pin 1 or 4 can be controlled by UPIO or by USART0 pins. The schematic of these connectors is the same as the one used by the CAN0 module (see Section 3.5). The LIN interfaces are connected to two three-pin header connectors: „ Connector J19 „ Connector J4 The pinout for the connector J19 used by the USART1 is described Table 3-8. Table 3-8. J19 Pinout Note: AT91SAM7A1 Pin (1) J19 Pin Function 1 Vs (8V - 18V) 2 LIN (Local Interconnect Network) TXD1/RXD1 3 Ground GND 1. Depends on the strap configuration. The pin-out for the connector J4 used by the USART0 is described Table 3-9. Table 3-9. J4 Pinout Note: AT91SAM7A1 Pin (1) J4 Pin Function 1 Vs (8V - 18V) 2 LIN (Local Interconnect Network) TXD0/RXD0 3 Ground GND 1. Depends on the strap configuration. Figure 3-2. Male DB9 Connector 1 2 6 3 7 4 8 5 9 For more details, refer to Figure 4-6. 3.7 Crystal Oscillators and Clock Distribution The system clock is derived from a 6 MHz crystal oscillator mounted on-board. At reset, the on-chip PLL-based frequency multiplier is disabled, using the frequency of the crystal oscillator as the default master clock. The low-frequency clock used for the lowpower mode, the Watchtimer module and the Watchdog module can be leaded by a 32 kHz crystal oscillator or a division of the 6 MHz crystal oscillator. At reset, the low-frequency clock is configured on the 32 kHz crystal oscillator mounted on-board. For more details, refer to Figure 4-2. 3.8 Memory Organization The Flash memory is an AT49BV1614A (1Mx16-bit). Write-protection for half of the onboard Flash memory is provided. Output 2 of Jumper J15 drives the address pin 20 of the Flash. To access the whole memory, put a jumper in J5: 1 - 2. AT91SAM7A1-EK Evaluation Board User Guide 3-5 6114A–ATARM–09/04 To protect the upper memory and access only the lower memory (from 0x40000000 to 0x40080000: only 1 Mbyte), put a jumper in J5: 2 - 3. To protect the lower memory and access only the upper memory (from 0x40080000 to 0x40100000: only 1 Mbyte), close the jumper from J5: 2 - 3. The mapping defined by the boot software is shown in Table 3-10. Table 3-10. Memory Mapping Element Address Flash 0x40000000 SRAM 0x48000000 3.9 I/O Expansion Two I/O expansion connectors (J17 and J18) provide the users with the general-purpose I/O (GPIO) lines, analog lines, VDD and ground. The connectors are not fitted at the factory; however, the user can fit any 2 x 25 connector on a 0.1" (2.54 mm) pitch. For connector pin-out details, see Figure 4-10. 3.10 External Bus Interface Figure 4-8 shows one 2 MByte 16-bit Flash (AT49BV1614A-90TC) and a 512 Kbyte 16bit SRAM device (Alliance AS7C34098-10TC or equivalent). Figure 4-9 shows the bus expansion connector (J16) that, like the I/O expansion connector (J17 and J18), is not fitted at the factory. The user can fit any 32 x 2 connector on a 0.1" (2.54 mm) pitch to gain access to the data, address, chip select, read/write, oscillator output and wait state pins. VDD and ground are available on the connector. On-board jumpers (J13, J14 and J15) allow the user to connect Chip Selects either to on-board memories or to the expansion connector. In most case, jumpers should be set up as in Table 3-11. Table 3-11. Board Jumper Configuration Jumper Jumper Configuration Description J13 1 - 2 closed On-board Flash driven by NCS0 1 - 2 left open On-board Flash always de-selected 1 - 2 closed On-board SRAM driven by NCS1 1 - 2 left open On-board SRAM always de-selected 1 - 2 closed 2 - 3 left open On-board Flash address line 20 is driven. User can access the whole memory space. 1 - 2 left open 2 - 3 closed On-board Flash upper memory protected. User can access only the 1 Mbyte lower space. 1 - 2 left open 2 - 3 left open On-board Flash lower memory protected. User can access only the 1 Mbyte upper space. J14 J15 3-6 6114A–ATARM–09/04 AT91SAM7A1-EK Evaluation Board User Guide 3.11 ICE Interface An ARM®-standard 20-pin box header (J11) is provided to enable connection of an ICE interface to the JTAG inputs on the AT91SAM7A1 device. This allows code to be developed on the board without the use of system resources such as memory and serial ports. A mini ICE interface is embedded on the board. It is accessed by a parallel port connector (J12). Note: To use a standard external ICE interface in target powered mode, it is necessary to close the strap E25 that enables the VCC power supply on the JTAG port. For more details, refer to Figure 4-7. 3.12 Default Strap Configuration Table 3-12. Default Strap Configuration Schematic Figure 4-3 Strap/Jumper Configuration Description E1 Closed VDDCORE connected to VDD E2 Closed AVDDCORE connected to AVDD E3 Closed VDDIO connected to VDDPERIPH J3 1 - 2 closed 2 - 3 open VDDPERIPH connected to VDD E26 Closed AGND connected to GND E10 1 - 2 closed 2 - 3 open MA2 EN_pin connected to NRESET E7 1 - 2 closed 2 - 3 open E4-1 (LCD pin 1) connected to VDDPERIPH E8 1 - 2 closed 2 - 3 open E4-2 (LCD pin 2) connected to GND E9 2 - 3 closed 1 - 2 open 3 - 4 open E16 2 - 3 closed 1 - 2 open Figure 4-4 Figure 4-6 1 LIN and 2 RS-232 interfaces E5 2 - 3 closed 1 - 2 open E6 2 - 3 closed 1 - 2 open J9 Closed E25 Closed Power on the JTAG connection J13 Closed NCS-FLASH connected to NCS0 J14 Closed NCS-SRAM connected to NCS1 J15 1 - 2 closed 2 - 3 open Flash pin A19 connected to signal A20/CS7 (whole memory accessible) Figure 4-7 Figure 4-8 AT91SAM7A1-EK Evaluation Board User Guide 3-7 6114A–ATARM–09/04 3-8 6114A–ATARM–09/04 AT91SAM7A1-EK Evaluation Board User Guide Section 4 Schematics 4.1 Schematics Table 4-1. AT91SAM7A1 Schematics Figure Reference Denomination Figure 4-1 Top Level Layout Figure 4-2 AT91SAM7A1 Figure 4-3 Power Figure 4-4 Application Interface Figure 4-5 CAN Interface Figure 4-6 RS-232 and LIN Interface Figure 4-7 ICE Interface Figure 4-8 Memories Figure 4-9 EBI Expansion Figure 4-10 Expansion Connector AT91SAM7A1-EK Evaluation Board User Guide 4-1 6114A–ATARM–09/04 Figure 4-1. Components Side Assembly 4-2 6114A–ATARM–09/04 AT91SAM7A1-EK Evaluation Board User Guide AT91SAM7A1 AT91SAM7A1 Figure 4-2. AT91SAM7A1 AT91SAM7A1-EK Evaluation Board User Guide 4-3 6114A–ATARM–09/04 Figure 4-3. Power 4-4 6114A–ATARM–09/04 AT91SAM7A1-EK Evaluation Board User Guide Figure 4-4. Application Interface AT91SAM7A1-EK Evaluation Board User Guide 4-5 6114A–ATARM–09/04 Figure 4-5. CAN Interface 4-6 6114A–ATARM–09/04 AT91SAM7A1-EK Evaluation Board User Guide Figure 4-6. RS-232 and LIN Interfaces AT91SAM7A1-EK Evaluation Board User Guide 4-7 6114A–ATARM–09/04 Figure 4-7. ICE Interface 4-8 6114A–ATARM–09/04 AT91SAM7A1-EK Evaluation Board User Guide (1) Note: AT49BV1614A-90TC Figure 4-8. Memories 1. AT479BV1614A-90TC can be replaced by AT49BV162A. AT91SAM7A1-EK Evaluation Board User Guide 4-9 6114A–ATARM–09/04 Figure 4-9. EBI Expansion 4-10 6114A–ATARM–09/04 AT91SAM7A1-EK Evaluation Board User Guide Figure 4-10. Expansion Connector AT91SAM7A1-EK Evaluation Board User Guide 4-11 6114A–ATARM–09/04 4-12 6114A–ATARM–09/04 AT91SAM7A1-EK Evaluation Board User Guide Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 487-2600 Regional Headquarters Europe Atmel Sarl Route des Arsenaux 41 Case Postale 80 CH-1705 Fribourg Switzerland Tel: (41) 26-426-5555 Fax: (41) 26-426-5500 Asia Room 1219 Chinachem Golden Plaza 77 Mody Road Tsimshatsui East Kowloon Hong Kong Tel: (852) 2721-9778 Fax: (852) 2722-1369 Japan 9F, Tonetsu Shinkawa Bldg. 1-24-8 Shinkawa Chuo-ku, Tokyo 104-0033 Japan Tel: (81) 3-3523-3551 Fax: (81) 3-3523-7581 Atmel Operations Memory 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 436-4314 RF/Automotive Theresienstrasse 2 Postfach 3535 74025 Heilbronn, Germany Tel: (49) 71-31-67-0 Fax: (49) 71-31-67-2340 Microcontrollers 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 436-4314 La Chantrerie BP 70602 44306 Nantes Cedex 3, France Tel: (33) 2-40-18-18-18 Fax: (33) 2-40-18-19-60 ASIC/ASSP/Smart Cards 1150 East Cheyenne Mtn. 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