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BitsyXb - User Manual

110118-0001A

5.2.3

System Sleep

This section describes several methods for putting the system into Sleep mode.

Power Failure Interrupt

When the input voltage falls below Vsleep (section 6.3.1), the system generates an internal power

failure interrupt (the DC_GOOD signal goes low). This interrupt gives the operating system early

warning of an impending power failure, allowing the system to drop into low-power Sleep mode

before power has failed completely.
Systems that have supercapacitors benefit from this feature by going to sleep before they begin

drawing down energy stored in the capacitors. This prolongs the amount of time the system can

maintain the contents of RAM.
Operating systems may allow the option to ignore power-failure interrupts. This allows systems to

run with lower input voltages without going to sleep. However, note that if the system does go to

sleep, it will not be able to wake until the input voltage is above Vsleep (see section 5.3.4 for

details).

RQOnOff Input

Operating systems and applications can configure the /RQOnOff signal (J3.45) to put the system

to sleep. In conjunction with the wakeup function (section 5.3.4, below), the /RQOnOff input can

be used as an "on/off" button for some systems. Electrical specifications are listed in section

6.3.7.

Software Control

Applications can put the system to sleep programmatically. Operating systems may also put the

system to sleep if the system has not been used for a certain amount of time or for other reasons.

In remote, battery-powered applications, software Sleep can be used in conjunction with the

Timed Wakeup feature (section 5.3.4) for minimum power consumption.

5.2.4

System Wakeup

This section describes several mechanisms for waking a BitsyXb system from Sleep mode. The

system will resume operation in Run mode unless the power supply voltage is lower than Vsleep

(section 6.3.1). If the input voltage is too low, the system will not wake under any circumstances.

This protects the RAM from getting corrupted by an undervoltage condition.

RQOnOff Input

Shorting the /RQOnOff signal (J3.45) to ground will wake the system. The signal is connected to

the system controller. Electrical specifications are listed in section 6.3.7.

Touch Panel

The touch panel controller interrupts the processor when touch panel events occur. Before going

to sleep, the processor can place the controller in a low-power sleep mode from which the

controller generates a wakeup interrupt when a touch event occurs.

Timed Wakeup

The processor can wake up at a predetermined time. This feature is controlled by software.

Содержание BitsyXb

Страница 1: ...www eurotech com Rev A August 2011 110118 0001A USER MANUAL BitsyXb PXA270 Single Board Computer ...

Страница 2: ... taken Eurotech assumes no responsibility for any error that may appear in this document Trademarks All product or service names are the property of their respective owners Revision History Issue no PWB Date Comments 2 Oct 2005 Preliminary release 3 Nov 2005 Second preliminary release A Aug 2011 Initial release Eurotech style and format 2005 Eurotech Inc For contact details see page 22 ...

Страница 3: ... Personality Board 2 2 Frequently Asked Questions 11 2 3 Errata Addenda and Further Information 12 3 Hardware Reference 13 3 1 Switches Controls and Indicators 13 3 1 1 S1 DIP Switch 13 3 1 2 LED Indicator 13 3 2 Jumper Settings 13 3 2 1 JP2 LCD Display Power Select 14 3 3 Signal Connectors 14 3 3 1 J1 LCD Panel Interface Connector 15 3 3 2 J2 PCMCIA 16 3 3 3 J3 Power I O Serial 2 3 USB Touch Scre...

Страница 4: ...dio 31 4 4 1 Microphone Pre amps 31 4 4 2 Audio Outputs Speakers and Headphones 31 Connecting Speakers Connecting Headphones Using Stereo Headphones and Speakers in the Same System 4 5 Buses and Data Communications 32 4 5 1 Serial Ports 32 4 5 2 USB 33 USB Host USB Function Client 4 5 3 Synchronous Serial Ports 34 Overview of Synchronous Serial Ports SSP on the PXA270 SSP on the BitsyXb 4 5 4 I2 C...

Страница 5: ... 5 2 2 Subsystem Partitioning 44 5 2 3 System Sleep 46 Power Failure Interrupt RQOnOff Input Software Control 5 2 4 System Wakeup 46 RQOnOff Input Touch Panel Timed Wakeup ADSmartIO Keypad 5 2 5 Supercapacitors 47 Charging Discharging 5 2 6 Backlight Power 48 5 2 7 Battery Trickle Charger volume production option 49 5 2 8 Power Supply Efficiency 50 5 3 Designing for Optimal Power Management 50 5 3...

Страница 6: ...ophone Gain 6 2 Environmental Specifications 56 6 3 Electrical Specifications 56 6 3 1 Reset Sleep Wakeup 56 6 3 2 LCD Display 57 6 3 3 Touch Panel Controller 57 6 3 4 Power Supply 58 6 3 5 Power Consumption 59 6 3 6 ADSmartIO Controller 60 6 3 7 System Controller 61 CompactFlash Port Used as Expansion Bus 6 3 8 Audio 62 6 3 9 PXA270 Processor 63 6 3 10 Crystal Frequencies 64 7 Board Revision Hist...

Страница 7: ... history section 7 2 1 2 Features 1 2 1 Processor PXA270 32 bit Marvell processor Clock rates from 104 to 520 MHz Battery backed real time clock 1 2 2 Power Supply 6 15 V main power input Battery trickle charger External supercapacitors support 1 2 3 Memory 64 MB synchronous DRAM 1 32 MB Flash memory PCMCIA Type I and II 3 3 and 5 V CompactFlash2 CF cards with optional personality board 1 The Bits...

Страница 8: ... personality board 1 2 5 User Interface and Display Flat Panel interface Software control of external Vee Generator for passive LCD contrast control Analog Touch Panel interface four or five wire options External PS 2 Keyboard support 1 2 6 I O Nine ADSmartIOTM ports configurable for digital I O A D inputs up to four and or up to 4x5 keypad Ten digital I Os Backlight control signals for Intensity ...

Страница 9: ...ty Board J10 PCMCIA J1 J13 SSP1 buffers I2C COM1 COM2 COM3 SSP2 CompactFlash LCD buffers buffers Marvell PXA270 MMC digital I Os amp amp J6 I2C Compact Flash Touch Panel Controller USB Function Battery charger buffers LCD COM2 COM3 COM1 JP4 7 J18 J22 J20 J31 J7 J16 J9 J15 J12 J44 J6 J34 J45 J46 J47 J49 J50 USB Function Backlight Touch panel Battery optional Power input IrDA P S2 Keyboard J36 Wakeu...

Страница 10: ...d operating system guide Please make sure you have received all the components before you begin your development 2 1 2 BitsyXb Personality Boards The BitsyXb often works in tandem with another board to add functionality and customize the system for its application Personality boards can add custom circuits and locate connectors best suited for the application design In production volumes the Bitsy...

Страница 11: ... Eurotech support site at http support eurotech inc com See section 2 4 for further details Q When I plug in power my screen stays black A If your system has supercapacitors installed section 5 3 3 your system may be asleep Try waking up the system by shorting the wakeup signal J3 pin 45 to ground Development systems include a two pin header on the personality board whose pins can be shorted toget...

Страница 12: ...y panel How can I do this A Eurotech may have already interfaced to the panel you are interested in Consult Eurotech for availability 2 3 Errata Addenda and Further Information Errata and addenda to this manual are posted on the Eurotech support forums along with the latest release of the manual Consult the support forums any time you need further information or feel information in this manual is ...

Страница 13: ...S1 is a two position DIP switch located on the edge of the board at the opening of the PCMCIA socket When in the ON position switches are closed and connect to ground Otherwise they are pulled up DIP switch positions 1 and 2 connect to the PXA270 Most operating systems on the BitsyXb reserve these switches for their use Consult the operating system manual for details 3 1 2 LED Indicator The BitsyX...

Страница 14: ...t voltages 3 3 Signal Connectors The following tables describe the electrical signals available on the connectors of the BitsyXb Each section provides relevant details about the connector including part numbers mating connectors signal descriptions and references to related chapters For information about the location of the connectors on the BitsyXb refer to section 6 1 1 Legend n c Not connected ...

Страница 15: ...IXCLK Pixel Clock 4 L_LCLK PNL_HSYNC Horizontal Sync 5 L_FCLK PNL_VSYNC Vertical Sync 6 GND ground 7 LDD15 PNL_RED0 Red Bit 0 8 LDD11 PNL_RED1 Red Bit 1 9 LDD12 PNL_RED2 Red Bit 2 10 LDD13 PNL_RED3 Red Bit 3 11 LDD14 PNL_RED4 Red Bit 4 12 LDD15 PNL_RED5 Red Bit 5 13 GND ground 14 LDD5 PNL_GREEN0 Green Bit 0 15 LDD6 PNL_GREEN1 Green Bit 1 16 LDD7 PNL_GREEN2 Green Bit 2 17 LDD8 PNL_GREEN3 Green Bit ...

Страница 16: ...er 2mm Samtec STMM 125 02 G D Recommended Board to Cable Connector TCSD series Recommended Board to Board Connector ESQT series e g ESQT 125 02 F D 500 Pin Name Pin Type Description 1 EIO9 IO PXA270 Digital I Os 4 7 1 6 3 9 EIO8 2 IO 3 EIO7 IO GND 4 P ground 6 VCC 8 PO 5 V 10 5 TEMP_SENSOR_MINUS AI External Temperature Probe 4 3 5 7 TEMP_SENSOR_PLUS PO 9 IRDAON O External IRDA control 11 TSPX AIO ...

Страница 17: ...WERENABLE O Power supply control 5 3 2 PE1 42 O Power Enable 1 for external devices 5 3 2 DCIN_POS 44 PI External power also on J6 48 45 RQONOFF I Request On Off Switch 5 3 3 6 3 1 GND 46 P ground 47 49 BATPOS 50 PI Real time clock backup battery 4 2 6 3 4 3 3 4 J6 Input Power Board Connector Molex 22 23 2021 Recommended Mating Connector 22 01 3027 These power inputs are also connected to J3 See C...

Страница 18: ...CC PO 5 V 13 SD_WP I SD MMC signals 4 5 5 14 SDIO_IRQ IO 15 SD_PWREN O 16 SD_DAT1 IO 3 3 6 J8 Vee Adapter Board Connector 2x4 unshrouded terminal strip 2mm Samtec TMM 104 01 G D SM Recommended Board to Board Connector ESQT series e g ESQT 104 02 F D 450 This header connects to an external Vee power supply adapter Header J8 supplies power and control signals to the adapter and receives the Vee outp...

Страница 19: ...D P ground CARDBDET2 2 I Card Detect 2 CARDB16 4 I 16 Bit Access 3 PCBD10 IO Data8 10 5 PCBD9 IO 7 PCBD8 IO PCBD2 6 IO Data0 2 PCBD1 8 IO PCBD0 10 IO 9 CARDBSTSCHG I Status Change 11 CARDBSPK I Speaker 13 CARDBREG O Register Access 15 VCC PO 5 V 17 CARDBWAIT I Wait 19 CARDBRES O Reset 21 CARDBVS2 I Voltage Sense 2 PCBA0 12 O Address0 6 PCBA1 14 O PCBA2 16 O PCBA3 18 O PCBA4 20 O PCBA5 22 O PCBA6 2...

Страница 20: ... 1 EXT_IRQ1 I External Interrupt 1 3 EXT_IRQ2 I External Interrupt 2 5 EIO4 IO PXA270 Digital I Os 4 7 1 6 3 9 EIO3 2 IO EIO2 4 IO EIO1 6 IO EIO0 8 IO 7 SIGPS2 IO External PS 2 Keyboard 9 CLKPS2 IO USB_PWR_SENSE 10 I Sense from external USB Host power switch 4 5 2 USB_PWR_CTRL 12 O Control to external USB Host power switch 4 5 2 USB_UDC 14 IO USB Host 4 5 2 USB_UDC 16 IO 11 I2C_SCL IO PC6 I2 C clo...

Страница 21: ...t 3 37 VDDX PO 3 3 V 39 MIC_GND P Microphone ground 41 MIC_L 42 AI Stereo Microphone MIC_R 44 AI 43 VREF AO ADSmartIO A D reference voltage 45 RESET_IN I External Reset 6 3 1 47 VDDX PO 3 3 V VCC 46 PO 5 V 48 49 I2C_SDA IO PC7 I2 C data 11 GND 50 P ground 3 3 9 J11 Supercapacitor Input Board Connector JST B 2B ZR SM3 TF Recommended Mating Connector ZH or ZR series This header provides a connection...

Страница 22: ...used during manufacturing for programming and test but is not otherwise supported for application use Production customers may use this header to reprogram boot code Pin Name Type Description 1 TRST I JTAG 2 TMS I 3 GND P 4 TDI I 5 TCLK I 6 VDDX PO 7 GND P 8 TDO O 9 FWE O 10 FRDY O 11 MISO O ATMega ADSmartIO 12 VCC PO 13 SCK I 14 MOSI I 15 PRG I 16 GND P ...

Страница 23: ...nt of RAM installed 4 1 3 Non Volatile Memory There are several ways to store data on the BitsyXb that will survive a power failure Some devices can only be accessed through operating system drivers and not all are available for application data storage Flash Memory Flash memory is the primary site for non volatile data storage The BitsyXb includes flash memory for non volatile data storage The da...

Страница 24: ... bus signals available on J9 These signals can be used to add a CompactFlash socket to a daughter board or to expand the capabilities of the BitsyXb as a digital expansion bus The Eurotech Bitsy CF and Ethernet Personality Boards use this bus for CF and digital expansion respectively The schematic Eurotech document number 640111 8000 available on the Eurotech Support Forums illustrates how to use ...

Страница 25: ...23 SCLK C SSP 24 SFRM C 25 TXD C 26 RXD C 27 USB_RECON N 28 BITCLK AC 97 Codec 29 AUDIO_IN 30 AUDIO_OUT 31 AUDIO_SYNC 32 SD_CLK O SD MMC J7 4 5 5 33 n c 34 RXD1 I Serial 1 J10 4 5 1 35 CTS1 I 36 DCD1 I 37 DSR1 I 38 RI1 I 39 TXD1 O 40 DTR1 O 41 TRS1 O 42 RXD1 I Serial 3 J3 4 5 1 43 TXD1 O 44 CTS3 I 45 RTS3 O 46 RXD2 I Serial 2 J3 4 5 1 47 TXD2 O 48 POE PCMCIA CF Card interface 49 PWE 50 PIOR 51 PIO...

Страница 26: ... LDD14 O 73 LDD15 O 74 L_FCLK VSY NC O 75 L_LCLK HSY NC O 76 L_PCLK O 77 L_BIAS O 78 CS2 tbd O CPLD chip select 79 CS3 PSKTSEL O 80 n c 81 SSP3TXD 82 SSP3RXD 83 SSP3SFRM 84 SSP3CLK 85 tbd PCMCIA 86 LDD16 O 87 LDD17 O 88 USB_PWR_SENSE 89 USB_PWR_CNTRL 90 n c 91 n c 92 SD_DAT0 IO SD MMC J7 4 5 5 93 EIO0 94 EIO1 95 EIO2 96 SDIO_IRQ I SD MMC J7 4 5 5 97 n c 98 DIP_SW0 I 99 n c 100 EIO3 101 EIO4 102 IR...

Страница 27: ...DSmartIO ADSmartIOTM is a RISC microcontroller on the BitsyXb that is programmed with Eurotech firmware This device provides additional I O functionality for specialized tasks Your application software can configure the standard ADSmartIO for a variety of functions such as digital I O PWM A D I2 C keypad scan and PS 2 keyboard operation 4 3 1 Overview The ADSmartIO controller has four eight pin I ...

Страница 28: ... I O port when it is configured as an input it enables a pull up resistor Electrical specifications are listed in section 6 3 6 4 3 4 Analog Inputs A D Each of the Port A I Os PA0 PA7 includes an analog to digital A D converter The converters give full scale readings when the input voltage is equal to voltage reference Vref e g V Vref reading 1023 Not all ports are available for external A D use s...

Страница 29: ...lines as outputs set to 1 high For the scan the keypad scanner sets successive COLn outputs to 0 low then looks for a 0 on one of the ROWn inputs The scanner re reads the pressed key after a delay to debounce the key press Unused column lines can be used for general purpose I O or A D Unused row lines can be used for general purpose I O only The following diagram illustrates how to connect a 3x3 k...

Страница 30: ... AI VBATT_POS divided by 7 2 PB0 J3 22 O Battery charger PB1 J3 41 I System Power enable PB2 O Wake up CPU PB3 O IRQ to CPU PB4 SSP_SFRM SSP communication with CPU PB5 SSP RX MOSI PB6 SSP TX MISO PB7 SSP CLK PC0 J10 17 IO Keypad or digital I O PC1 J10 19 IO PC2 J10 21 IO PC3 J10 23 IO PC4 J10 25 IO PC5 J1 3 I Pixel clock PC6 J10 11 IO unused 13 PC7 J10 49 IO PD0 J1 33 O Passive panel enable PNL_EN...

Страница 31: ... 32 determines the output mode of the amplifier When HP_IN is high the audio output drive is single ended when HP_IN is low the output drive is differential An on board pull up normally keeps HP_IN high Connecting Speakers When using the BitsyXb to drive speakers short the HP_IN signal to ground This places the output amplifier in differential mode Connect speakers to the SPKR_L and SPKR_R outputs...

Страница 32: ...ly switch the amplifier to single ended mode when a headphone plug is inserted in the jack This will disable the drive to any speakers that are wired into the system Most headphone jacks include mechanical switches that indicate when a headphone plug has been inserted The diagram at right shows a circuit that pulls down the HP_IN signal when a headphone plug is removed For this circuit to work rel...

Страница 33: ...andard also permits directly wiring the USB signals to the target USB device e g USB mouse To connect more than one USB client device to the BitsyXb use a USB hub The USB protocol allows client devices to negotiate the power they need from 100 mA to 500 mA in 100 mA increments The BitsyXb supplies 5 V power through the USB_PWR pin Make sure to account for power used through USB in your BitsyXb pow...

Страница 34: ...ound and one or more device selects Each device on the bus requires its own select line Buses may be full or half duplex clocking data one or both directions at the same time respectively Each standard defines which devices are bus masters and which are slaves To clarify direction of the data signals the SPI bus master transmit line STXD is also known as MOSI Master Out Slave In while its receive ...

Страница 35: ...enerates the SSP bit clocks from the on chip 13 MHz clock It does not support an external clock input Electrical specifications for SSP3 are listed in section 6 3 9 Consult the operating system references for details about how to use the SSP bus for external devices 4 5 4 I2 C Bus Master I2 C Inter IC Bus is a multi master two wire synchronous serial bus developed by Philips for communications bet...

Страница 36: ... 2 Z11 SCL SDA The following table lists the addresses of the I2 C devices on the Bitsy Xb Device Address Function DS1307 1101 000 Real Time Clock LTC1663 0100 000 Voltage Control The DS1307 supports a maximum bit rate of 100 kbps Do not use the I2 C bus at rates faster than 100 kbps The BitsyXb I2 C signals are available on connectors J7 and J10 Electrical specifications are listed in section 6 3...

Страница 37: ...l socket An external circuit usually just a power transistor and related pull ups is required to make use of this signal BitsyX name Description Type J7 pin SD_PWREN Power Enable driven by CPLD O 15 Some Secure Digital sockets supply the following signals which are not part of the SD SDIO standard These signals are also connected on header J7 SD pin BitsyX name Description Type J7 pin 10 SD_CD Car...

Страница 38: ...lay Signals Display signals LDD0 through LDD15 as well as the pixel clock vertical sync and horizontal sync are all buffered at a factory set voltage See section 6 3 2 for full specifications The PNL_RL and PNL_UD signals are for active TFT displays that support changing the scan direction This feature allows the display to be flipped right to left RL or up and down UD by changing the voltage on t...

Страница 39: ... J3 16 and Backlight On J3 18 Backlight PWM is a filtered PWM signal that supplies an analog output voltage to control the intensity of the backlight The Backlight On signal is an open collector output to turn the backlight on and off The ADSmartIO controller drives these signals See section 6 3 2 for electrical specifications 4 6 7 Contrast Control Vee and Vcon Vee and Vcon are used to control th...

Страница 40: ...sage Notes 5 PXA270 1 kΩ Y J3 EIO5 9 5 PXA270 1 kΩ Y J10 EIO0 4 5 ADSmartIO 1 kΩ Y J10 PC0 4 or ROW0 4 4 ADSmartIO 1 kΩ Y J10 PA0 3 or COL0 3 2 ADSmartIO 1 kΩ Y J10 PD0 or Passive panel enable PD1 or Thermistor energize 4 7 2 Analog Inputs The BitsyXb uses the ADSmartIO controller to perform analog to digital A D conversions These A D inputs are typically used for low speed uncalibrated applicatio...

Страница 41: ...cations Many products using Eurotech single board computers have successfully completed FCC and CE emissions testing as a part of their design cycle Because Eurotech supplies only the single board computer and not fully integrated systems Eurotech cannot provide meaningful system level emissions test results See the crystal frequencies section 6 3 10 and electrical specifications for information t...

Страница 42: ...f electrical power The processor core is powered off and only a few processor peripherals RTC I Os and interrupt control remain active The transition back to Run mode may take a few hundred milliseconds as clocks must stabilize and hardware that was powered off must be reinitialized Idle mode reduces power consumption by pausing the processor core clock Processor peripherals remain enabled This mo...

Страница 43: ...itectural Overview and Power Management Features This section provides an overview of the architecture of the BitsyXb power supply and a description of the various features of the BitsyXb power management systems 5 2 1 Power Supply Architecture The BitsyXb power supply is laid out as shown in the following diagram Incoming DC power is regulated to 5 and 3 3 V Other system voltages are derived from...

Страница 44: ...tively turn off power to subsystems on the board This load shedding feature can extend battery life and significantly increase the amount of time the supercapacitors will hold up system power Applications and the operating system determine how selective power management is utilized BitsyXb systems that can be selectively disabled include the following LCD display panel power and signal buffers Vee...

Страница 45: ...of power management BitsyXb LCD Display Backlight Inverter PCMCIA and CF Touch Screen Contrast Vee Display Power Data Signals System Controller ON Brightness PWM On Off RS 232 Buffers ON POWER DOWN RUN POWER DOWN ON OFF ON OFF 3 3V 5V OFF PXA255 I Os ON OFF PXA255 Core RUN IDLE SUSPEND DRAM RUN SUSPEND Self Refresh Flash READ WRITE STANDBY POWER DOWN Power Management Flow ADSmartIO RUN SUSPEND Tou...

Страница 46: ...an be used as an on off button for some systems Electrical specifications are listed in section 6 3 7 Software Control Applications can put the system to sleep programmatically Operating systems may also put the system to sleep if the system has not been used for a certain amount of time or for other reasons In remote battery powered applications software Sleep can be used in conjunction with the ...

Страница 47: ...stance R and the capacitance C It takes three time constants 3RC to charge fully discharged supercaps to 95 of their target voltage For example a system with 44 ohm charging impedance and 1 65 F supercaps has a time constant of 73 seconds Allow at least five minutes to recharge the capacitors after the board has been disconnected from power Charge time is shorter if the supercaps aren t completely...

Страница 48: ...he capacitor Vf is the supercap voltage at which onboard systems will fail assume 3 2 V C is the capacitance of the supercaps in Farads Eff is the efficiency of power delivery 85 90 is a safe value to use Isleep is the amount of current the system consumes while in sleep mode For example a system with fully charged 1 65 F supercaps and a sleep current of 4 mA can expect to run for up to ten minute...

Страница 49: ...the negative terminal of the battery allows the battery to power the BitsyXb at any time but prevents the battery from being charged by a DC voltage on the DCIN_POS input The charge current is calculated as follows Icharge R V 0 2 2 DCIN_POS batt where Vbatt is the battery voltage Vbatt_pos Vbatt_neg and R is the charge resistor section 6 3 4 While standard systems include the charging circuit the...

Страница 50: ...igners using the BitsyXb should have a clear understanding of how power usage will be allocated in the system they design Designers should create a power budget that takes into account the types of devices that are expected to be used with the BitsyXb The following lists detail some of the typical external loads that can be placed the BitsyXb power supplies Baseline power consumption of the BitsyX...

Страница 51: ...through the Card Detect and Voltage Sense lines Assume that all four lines ground the BitsyXb PCMCIA pull ups while the card is inserted Digital I Os Review digital I O connections for potential voltage differences from external connections when the BitsyXb is asleep USB Depending on how USB devices are powered and how the operating system handles USB USB devices may draw power during Sleep 5 4 Po...

Страница 52: ...attery 12V Transient spike suppression 0 3 3V VBatt_Pos digital input 12V ignition 8V trip Vehicle ground Ground 5 4 3 Line Power and Battery with External Charger You may choose to use an off board battery charger for a specific battery chemistry or voltage The following diagram illustrates one way to include a charger on your own personality board Personality Board BitsyXb VBatt_Pos Ground Groun...

Страница 53: ... battery or other DC power source The Bitsy Personality Board Eurotech p n 640111 8000 includes an external battery charger using a design similar to the one depicted above For an illustration of how to use the onboard BitsyXb trickle charger in conjunction with line power see the diagram in section 5 3 7 ...

Страница 54: ...the dimensions of the BitsyXb as well as locations of key components on the board The PCMCIA ejector is integrated into the design and is not removable All dimensions are in inches This image is an excerpt from the full mechanical drawings Eurotech document number 630118 00004 6 1 2 Mounting Holes Four holes one on each corner are provided for mounting The diameter of the holes is 0 138 in Mountin...

Страница 55: ...e BitsyXb to sit on top of another board Note that J7 can only be populated on the top side of the BitsyXb Important When the headers are placed on the underside of the board the pin numbers will not correspond to the signals as described in this manual Lay out the mating board with this in mind PCMCIA Rails with no Ejector In applications where the PCMCIA ejector causes clearance problems Eurotec...

Страница 56: ...prq pull up voltage Vddx V Rprq pull up resistance 11 kΩ Notes 1 The reset controller can support operating voltages up to 10 VDC However such high voltages on Vddx through the pull up resistor may damage the system 2 The RQOnOff signal is connected to the system controller which determines this rating see section 6 3 7 3 Short RESET_IN to GND to reset system 4 This is the voltage at VBATT_POS at ...

Страница 57: ...onfigured at the factory with buffers for 3 3 or 5 V panel data R148 selects 5 V power for the buffers while R137 selects 3 3 V power 5 V displays with Vih 0 6 Vpnl_pwr 3 0 V will work reliably with 3 3 V data 10 PNL_RL is pulled up with R193 or pulled down with R207 11 PNL_UD is pulled up with R191 or pulled down with R192 12 Vcon is the low voltage PWM signal used to control Vee It can be used d...

Страница 58: ...p Power 4 2 V BATPOS real time clock battery backup 2 2 3 0 3 6 V I BATPOS RTC current note 18 300 500 nA Battery Trickle Charger 5 3 7 Rch Charger series resistance 37 5 Ω Pch Charge resistor power rating 0 25 W Notes 15 The system can operate down to the minimum voltage shown but the DC_GOOD signal may cause the system to go to sleep when running at that voltage See Power Failure Interrupt in se...

Страница 59: ...Eurotech Development Systems include the Sharp LQ64D343 5V TFT VGA display which draws about one watt and the Taiyo Yuden LS520 backlight inverter which draws about six watts at full intensity Test Condition VBATT_POS 6 5 V 9 V 12 V 15 V Sleep mode 5 33 4 36 3 36 3 45 CPU idle note 19 85 550 66 590 52 620 44 660 Run mode max note 20 260 1690 190 1710 175 2100 140 2100 Units mA mW mA mW mA mW mA mW...

Страница 60: ...Vref A D reference voltage note 25 2 5 V Ivref Current drain from ref voltage 100 uA Vin valid A D input voltage range 0 Vref V I Vref J10 43 100 µA Temperature Sensing 4 3 5 Rth external thermistor resistance 25C 33 kΩ Vt thermistor excitation voltage Vref V Rtl lower voltage divider 47 kΩ I2C Bus 4 5 4 note 26 Bus clock 50 kHz input buffer size 32 byte packet size 32 byte Vi o I O voltages see d...

Страница 61: ...V I 3 3V 3 3 V socket current tbd 2 W Rp pcmcia Card detect 1 2 and voltage sense VS1 2 pull ups note 100 kΩ Vp pcmcia Card detect and voltage sense pull up voltage note 29 Vddx Vcc Vcc V Digital Outputs Vol 0 Vccb Voh 1 0 Vccb I sink mA I source 4 mA Digital Inputs Vil Vccb 3 3 V 0 325 Vccb Vccb 5 0 V 0 8 V Vih Vccb 3 3 V 0 475 Vccb Vccb 5 0 V 2 4 V Timing note 30 t mem system memory clock 9 7 us...

Страница 62: ...ll ups and different input gain and filtering See section 6 1 4 for details about volume production options Absolute Maximum Ratings Vin_mic 5 Vdc Symbol Parameter Min Typ Max Units DVdd codec digital supply voltage 3 3 V Avdd codec analog supply voltage 5 0 V fso sample rate output 48 kHz fsi sample rate input note 31 8 44 1 kHz Audio Input Vin_mic signal input voltage 100 mVrms Gain_mic pre amp ...

Страница 63: ...ation only run directly to the processor section 4 5 1 No series resistance or ESD protection is provided These lines should be treated as digital I Os and protected for over current and over voltage accordingly Ferrite beads are included on Serial 1 and Serial 3 ports with 33Ω series resistance added under the 3 3 V logic level production option PXA270 synchronous serial port 3 SSP3 is available ...

Страница 64: ... radio frequency emissions typically need to know the frequencies of onboard oscillators The following table lists the frequencies of all crystals on the BitsyXb Crystal Device Typ Units X1 ADSmartIO microcontroller 3 6864 MHz X2 RTC 32 768 kHz X3 Codec 24 576 MHz X4 XScale core 13 000 MHz X5 XScale RTC 32 768 kHz ...

Страница 65: ...J11 for external supercapacitors Adds header J8 for off board Vee Generator Changes In system programming and test signals from headers J4 and J5 merge into J16 System controller CPLD replaces SA 1111 for PCMCIA CF control PXA270 replaces SA 1111 for SPI and USB Host functionality LCD power select shunt JP3 changes to JP2 Removes JP4 for Vee polarity now found on Vee adapter board Bottom side clea...

Страница 66: ...om Web www eurotech com Finland EUROTECH Tel 358 9 477 888 0 Fax 358 9 477 888 99 E mail sales fi eurotech com E mail support fi eurotech com Web www eurotech com ASIA Japan ADVANET Tel 81 86 245 2861 Fax 81 86 245 2860 E mail sales advanet co jp E mail tsupport advanet co jp Web www advanet co jp India EUROTECH Tel 91 80 43 35 71 17 E mail sales in eurotech com E mail support in eurotech com Web ...

Страница 67: ...www eurotech com www eurotech com EUROTECH HEADQUARTERS Via Fratelli Solari 3 a 33020 Amaro Udine ITALY Phone 39 0433 485 411 Fax 39 0433 485 499 For full contact details go to www eurotech com contacts ...

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