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Applied Data Systems Bitsy Plus User Manual Download Page 67

 

 

Board Revision History 

ADS document # 110114-1001A 

 

Page 57 

7.2.2 

Revision 3 

Internal release 

7.2.3 

Revision 4 

Internal release 

7.2.4 

Revision 5 

New Features 

USB_Reconn signal added at J3 pin 33 (formerly n/c) (SA-1110 GP12) (4.5.2) 

Can turn off ADSmartIO analog voltage reference (Vref) as part of subsystem partitioning 

Production option to bypass audio amplifier 

ADSmartIO now can monitor the DC_GOOD signal (VBATT_NEG is a production option). 

Enhancements 

Expanded backlight PWM voltage range from 3.3 V to 5 V (option for 3.3 V) 

Codec reset control (SA-1110 GP11) 

Reduced sleep mode current 

Improved touch panel operation (lower noise) 

Improved audio codec operation through additional power and ground partitioning 

Height of tallest component on bottom side of board reduced from 0.185 inches (4.70 mm) to 
0.126 inches (3.20 mm) 

Changes 

Flash reset now controlled by system reset.  Resolves condition under which system will 
sometimes not reboot from hard reset. 

PCMCIA power control updated to allow full cut-off of power 

PCMCIA 3.3V power control enable signal has inverse polarity 

RqOnOff signal management now passed through CPLD and handled by ADSmartIO. 

System can wake up after a touch screen event 

7.2.5 

Revision A 

Enhancements 

Temperature sensor input has 2x improved resolution across industrial temperature range. 

Reduced sleep current 

Adds support for CS4202 audio codec 

Improved Vddx performance with 5V-only systems 

Summary of Contents for Bitsy Plus

Page 1: ...Bitsy Plus User s Manual ADS document 110114 1001A Applied Data Systems www applieddata net 9140 Guilford Road Columbia MD 21046 USA 301 490 4007 2003 ADS ...

Page 2: ......

Page 3: ...hanges and Updates Add Vcc and Vddx sleep current specs 6 2 4 Add power consumption measurements and plots 6 2 5 Change ADSmartIO PA5 from VBATT_NEG to DC_GOOD 4 3 7 6 2 1 Change DCIN_POS parameter to VBATT_POS reduce minimum voltage from 6 to 5 V and add note 15 Add Vsleep hyst parameter and note 6 2 1 Lower Vsleep voltage specification 6 2 1 Update value for Rtl 6 2 6 7 2 5 Update value for Rp p...

Page 4: ...2 10 Expand information about PCMCIA CF current leaks during sleep 6 2 12 Add Printing this Manual section Add pin direction information to pinouts 3 3 Add note about change in 3 3V PCMCIA power control 7 2 4 Add information about driver of LED expand note about GP20 which is shared by LED0 DTR1 3 1 2 Add rev 5 Vref and RqOnOff changes to power management diagram 5 3 2 Add diagram of audio archite...

Page 5: ...bout Vsleep 6 2 1 Add sleep current notes 16 and 17 6 2 4 A Corrections Correct reversal of MOSI and MISO signals in section 3 3 3 and add signal name details in section 4 5 3 Correct usage of GP 27 in table of section 4 1 6 not available on J3 Correct error JP3 does not control panel data voltage Sections updated 3 2 1 remove note 4 6 2 and 4 6 3 correct text 6 2 2 add information about R288 and ...

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Page 7: ... 2 1 Development Systems 5 2 1 1 System Components 5 2 1 2 Bitsy Plus Personality Boards 5 ADS CF Personality Board 5 ADS Ethernet Personality Board 6 2 2 Frequently Asked Questions 6 2 3 Organization of this Manual 7 2 4 Errata Addenda and Further Information 7 3 Hardware Reference 9 3 1 Switches and Indicators 9 3 1 1 S1 DIP Switch 9 3 1 2 LED Indicator 9 3 2 Jumper Settings 9 3 2 1 JP3 Flat Pan...

Page 8: ...ross Reference 18 4 2 Real Time Clock RTC 19 4 3 ADSmartIO 19 4 3 1 Overview 19 4 3 2 ADSmartIO Features 20 4 3 3 Digital I Os 20 4 3 4 Analog Inputs A D 20 4 3 5 Temperature Sensing 20 4 3 6 Keypad Scan 20 4 3 7 ADSmartIO Signal Cross Reference 22 4 4 Audio 23 4 4 1 Microphone Pre amps 23 4 4 2 Audio Outputs Speakers and Headphones 23 Connecting Speakers 23 Connecting Headphones 23 Using Stereo H...

Page 9: ...Architectural Overview and Power Management Features 33 5 3 1 Power Supply Architecture 33 5 3 2 Subsystem Partitioning 33 5 3 3 System Sleep 35 Power Failure Interrupt 35 RQOnOff Input 36 Software Control 36 5 3 4 System Wakeup 36 RQOnOff Input 36 Touch Panel 36 Timed Wakeup 36 ADSmartIO 36 5 3 5 Supercapacitors factory option 37 Charging 37 Discharging 37 5 3 6 Backlight Power 38 5 3 7 Battery T...

Page 10: ...sumption 48 6 2 6 ADSmartIO Controller 49 6 2 7 System Controller with Digital I Os 50 6 2 8 USB 50 6 2 9 Audio 50 6 2 10 SA 1110 Processor 52 6 2 11 Crystal Frequencies 52 6 2 12 SA 1111 Companion Chip 53 PCMCIA CompactFlash Port and Expansion Bus 53 7 Board Revision History 55 7 1 Identifying the board revision 55 7 2 Revision History 55 7 2 1 Revision 2 55 New Features 55 Enhancements 55 Change...

Page 11: ...and II 3 3 and 5 V Supports CF cards with optional personality board 1 2 4 Communications USB 1 1 Host port low 1 5 Mbit s and full 12 Mbit s speeds and full speed Client port Three Serial Ports Serial 1 RS 232 3 3V CMOS 9 wire Serial 2 3 3V CMOS 3 wire IrDA and RS 232 with optional personality board Serial 3 RS 232 3 3V CMOS 5 wire 1 The Bitsy Plus supports 128 MiB SDRAM However those components ...

Page 12: ...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 and On Off External Temperature Probe support 1 2 7 Audio Interface AC 97 Codec Stereo Microphone Inpu...

Page 13: ...ouch Screen SPI Stereo Mic Stereo Speaker Headphones PCMCIA Compact Flash USB Host Power Management Controller AVR ADSmartIO I2 C RTC External 3V Battery Cell PS 2 Keyboard DC IN Battery IN Temp Sensor 4 AN 5 DIG Ins or 4x5 Scan Matrix or 9 GPIOs Progr IO Controller 10 IOs Backlight Ctrl LCD Interface Contrast Regulator Power Supply Regulator Bitsy Plus SuperCap Address Data Control Controller Pow...

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Page 15: ...e make sure you have received all the components before you begin your development 2 1 2 Bitsy Plus Personality Boards The Bitsy Plus 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 Plus can be built with ...

Page 16: ...ctFlash card A No The Bitsy Plus supports hot swapping of PCMCIA and CompactFlash cards Consult the operating system documentation for details Q Do I need to observe any ESD precautions when working with the system A Yes If possible work on a grounded anti static mat At a minimum touch an electrically grounded object before handling the board or touching any components on the board Q What do I nee...

Page 17: ...fications To locate the information you need try the following 1 Browse the Table of Contents Section titles include connector designators and their function 2 Follow cross references between sections 3 View and search this manual in PDF format 2 4 Errata Addenda and Further Information Errata and addenda to this manual are posted on the ADS support forums along with the latest release of the manu...

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Page 19: ...ed up DIP switch positions 1 and 2 connect to the SA 1111 Most operating systems on the Bitsy Plus reserve these switches for their use Consult the operating system manual for details 3 1 2 LED Indicator The Bitsy Plus has one onboard LED mapped as follows Signal GPIO line Part Designator Color LED0 20 D3 Green LED0 shares StrongARM GPIO20 with the DTR signal of Serial 1 J10 as shown at right The ...

Page 20: ... 3 negative n c no Vee 3 3 Connector Pinouts The following tables describe connector pinouts and the type of connector At least one pin of every connector is labeled on the Bitsy Plus Pin 1 of the connector is also typically indicated by a square pad where the pin is soldered to the board As seen from the component side5 double row headers on the board are all numbered as shown in the figure to th...

Page 21: ..._PIXCLK 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 Bi...

Page 22: ...es Recommended Board to Board Connector ESQT series e g ESQT 125 02 F D 500 Pin Name Pin Type Description 1 EIO9 IO EIO8 2 IO 3 EIO7 IO Digital I Os 6 2 7 4 GND 6 P ground 8 VCC 10 PO 5 V 5 TEMP_SENSOR _MINUS AI 7 TEMP_SENSOR _PLUS PO External Temperature Probe Connection 4 3 5 9 IRDAON O External IRDA control output 11 TSPX AIO right UL 13 TSMY AIO top LR 15 TSMX AIO left LL 17 TSPY AIO bottom UR...

Page 23: ...n J6 45 RQONOFF I Request On Off Switch Input 5 3 3 6 2 1 46 47 49 GND P ground BATPOS 50 PI Real time clock backup battery 4 2 6 2 4 3 3 4 J4 Manufacturing Test Connector Type 2x3 header 0 100 inch spacing This header is used during manufacturing to load the ADSmartIO firmware It is not supported for any other use 3 3 5 J5 JTAG Connector Type 1x6 header 0 100 inch spacing This header is used duri...

Page 24: ...tect 2 CARDB16 4 I 16 Bit Access 3 PCBD10 IO 5 PCBD9 IO 7 PCBD8 IO Data8 10 PCBD2 6 IO PCBD1 8 IO PCBD0 10 IO Data0 2 9 CARDBSTSCHG I Status Change 11 CARDBSPK I Speaker Input 13 CARDBREG O Register Access 15 VCC PO 5 V 17 CARDBWAIT I Wait 19 CARDBRES O Reset 21 CARDBVS2 I Voltage Sense 2 Input PCBA0 12 O PCBA1 14 O PCBA2 16 O PCBA3 18 O PCBA4 20 O PCBA5 22 O PCBA6 24 O Address0 6 23 3 3V P0 3 3 V...

Page 25: ... I External Interrupt 2 Input 5 EIO4 IO EIO3 2 IO EIO2 4 IO EIO1 6 IO EIO0 8 IO Digital I Os 6 2 7 7 SIGPS2 IO 9 CLKPS2 IO External PS 2 keyboard inputs USB_PWR_ SENSE 10 I Sense Input from external USB host power switch 4 5 2 USB_PWR_ CTRL 12 O Discrete output to control external USB host power switch 4 5 2 USB_UDC 14 IO USB_UDC 16 IO USB Host 4 5 2 11 SMTIO2 IO PC6 RTC I2 C or ADSmartIO7 13 SMTI...

Page 26: ...8 I RTS1 40 O Serial 1 8 RS 232 with 3 3 V CMOS factory option 4 5 1 35 EXT_IRQ3 I External Interrupt 3 Input 37 VDDX PO 3 3 V 39 41 MIC_GND P Microphone ground MIC_L 42 AI MIC_R 44 AI Stereo Microphone Input 43 VREF AO ADSmartIO A D reference voltage 45 RESET_IN I External Reset Input 6 2 1 47 VDDX PO 3 3 V 46 VCC 48 PO 5 V 49 SMTIO3 IO PC7 RTC I2 C or ADSmartIO9 GND 50 P ground 8 Serial 1 signal...

Page 27: ... Bitsy Plus 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 Bitsy Plus includes a bank of flash memory for non volatile data storage The board supports 8 16 or 32 MiB of installed flash The data bus width is 32 b...

Page 28: ...on J9 These signals can be used to add a CompactFlash socket to a daughter board or to expand the capabilities of the Bitsy Plus as a digital expansion bus The voltage of the bus signals are set by the CardBVcc voltage 3 3 V or 5 V The ADS Bitsy CF and Ethernet Personality Boards use this bus for CF and digital expansion respectively The schematic ADS document number 640111 8000 available on the A...

Page 29: ...accessible through the ADSmartIO s I2 C bus section 4 5 4 See section 6 2 4 for electrical specifications 4 3 ADSmartIO ADSmartIOTM is a RISC microcontroller on the Bitsy Plus that is programmed with ADS 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...

Page 30: ...verter The converters give full scale readings when the input voltage is equal to voltage reference Vref e g V VrefŸreading 1023 Not all ports are available for external A D use see section 4 3 7 for port assignments Electrical specifications are listed in section 6 2 6 4 3 5 Temperature Sensing The Bitsy Plus ADSmartIO can read the temperature of an external thermistor connected across pins 5 and...

Page 31: ...debounce the key press Unused row and column lines can be used for general purpose I O or A D The following diagram illustrates how to connect a 3x3 keypad matrix The pull ups are the software activated internal resistors of the ADSmartIO while the series resistors are part of the Bitsy Plus SW1 SW4 SW7 SW2 SW5 SW8 SW3 SW6 SW9 ROW 0 ROW 1 ROW 2 COL 0 COL 1 COL 2 ADSmartIO Controller 3 x 3 Keypad B...

Page 32: ...POS divided by 7 2 PB0 J3 22 O Battery charger PB1 I System Power enable PB2 O Wake up CPU PB3 O IRQ to CPU PB4 SSP_SFRM PB5 SSP RX PB6 SSP TX PB7 SSP CLK SSP communication with CPU PC0 J10 17 IO PC1 J10 19 IO PC2 J10 21 IO PC3 J10 23 IO PC4 J10 25 IO Keypad A D or digital I O PC5 J1 3 I Pixel clock PC6 J10 11 IO RTC I2 C or digital I O 13 PC7 J10 49 IO RTC I2 C or digital I O PD0 J10 15 IO Passiv...

Page 33: ...fier 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 Bitsy Plus 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 on J3 Connecting Headphones Standard he...

Page 34: ...on will need to play out Larger capacitors give improved bass response lower frequency cutoff but are physically larger and cost more The corner frequency for the low pass filter created by the capacitor and the headphone speaker is calculated as fo 1 2πRLC A 330 uF capacitor into a 32 ohm headphone speaker will give a low cutoff frequency of 15 Hz Use electrolytic capacitors rated for at least 6 ...

Page 35: ...as three StrongARM serial ports configured as follows Port signals Connector Standard Factory options Serial 1 9 wire J10 RS 232 9 wire 3 3 V CMOS Serial 2 3 wire J3 3 3 V CMOS none Serial 3 5 wire J3 RS 232 3 3 V CMOS The StrongARM serial ports supply two signals TX and RX three wire serial counting GND The Bitsy Plus uses StrongARM GPIO lines to generate additional signals RTS and CTS for Serial...

Page 36: ... Type B socket mating face shown at left The USB standard also permits directly wiring the USB signals to the host or to a host connector e g USB mouse The Bitsy Plus supports the full USB connection speed 12 Mbit s so you must tie a 1 5 kΩ pull up to the USB signal to indicate this capability to host hardware USB_PWR is power supplied from the host computer Since the Bitsy Plus is self powered no...

Page 37: ...ed to make use of one or more of the following features Data widths from four to sixteen bits 16 entry transmit and receive FIFOs with burst mode data transfers to from RAM Adjustable FIFO threshold interrupts Bit clock speeds up to 1 84 MHz Support for Microwire a National Semiconductor standard and SSP Synchronous Serial Port a TI standard Contact ADS Sales of your application will require a dri...

Page 38: ...ion you ll require 4 6 Displays The Bitsy Plus uses the integrated StrongARM display controller to drive liquid crystal displays LCDs Connector J1 supplies the power and data signals needed to drive LCDs while backlight and touch panel control signals are located on connector J3 4 6 1 Display Types Supported ADS has configured the Bitsy Plus for a wide variety of display types and sizes Consult th...

Page 39: ...play controller pins differently based on LCD technology and color palette size The following table illustrates how they are mapped for some of the more common technologies Consult the SA 1110 User s Manual for more information Color Active Color Passive Mono Passive StrongARM Signal Name 16 bit 12 bit Dual Single Dual Single DPD18 Single LDD0 B0 B0 DU0 D0 DU0 D0 D0 LDD1 B1 B1 DU1 D1 DU1 D1 D1 LDD...

Page 40: ... the contrast The Vcon output is a PWM controlled output that can be used for this purpose Electrical specifications for Vee and Vcon are listed in section 6 2 2 4 6 8 Touch Panel The Bitsy Plus supports four and five wire analog resistive touch panels five wire control is a factory option Connect the touch panel to the inputs on connector J3 The touch panel controller can wake the system from sle...

Page 41: ...mation about how much power the Bitsy Plus consumes consult the electrical specifications in section 6 2 5 5 1 Determining the Features You Need Not all designs with the Bitsy Plus need to be optimized for lowest power consumption Consider the following types of typical system configurations to determine the topics of interest to your application Relevant Topics Features Required Line power 5 3 1 ...

Page 42: ...e configured to be in StrongARM RUN or SLEEP modes IDLE mode is controlled by the operating system and is typically transparent to the application In RUN and IDLE modes the power supplies are in their standard full power state and applications run normally on the system Specific subsystems as described in section 5 3 2 may be selectively disabled to conserve power during these states In SLEEP mode...

Page 43: ...ctions 5 3 7 and 5 5 3 for examples Several factory options are available and are indicated by dashed lines in the diagram above The supercapacitors section are a standard factory option The other options are available for production customers but are outside the scope of this manual Contact your ADS sales representative if you believe one or more of these options is required for your application ...

Page 44: ...trates the architecture of the Bitsy Plus power management system At the heart of the system is a power controller that controls the state of the various power subsystems of the Bitsy Plus Under control of the StrongARM processor this controller can manage most of the power distribution of the board The StrongARM PowerEnable signal controls the rest of the subsystems 19 19 The controller inverts t...

Page 45: ...c Pre amps ON OFF Audio Amplifier ON POWER DOWN CONN_PE1 CONN_PE2 RqOnOff PowerEnable Vcon Vref ON OFF Power Supply 5V RUN BURST MODE 3 3V Vddx RUN Switcher SUSPEND Linear 1 75V CPU ON OFF J3 PC Card 5 3 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 2 2 the system generates a ...

Page 46: ...mum power consumption 5 3 4 System Wakeup This section describes several mechanisms for waking a Bitsy Plus system from Sleep mode The system will resume operation in Run mode unless the power supply voltage is lower than Vsleep section 6 2 2 If the input voltage is too low the system will not wake under any circumstances This protects the RAM from getting corrupted by an under voltage condition R...

Page 47: ... Charge time is shorter if the supercaps aren t completely discharged The charging current for the supercaps starts out high and diminishes exponentially as the capacitors reach full charge Make sure to account for this current in your power budget section 5 4 1 The charge current is calculated as i t t RC i t e R V V where Vt is the charging final voltage of the capacitor assume 5 0 V unless the ...

Page 48: ...s of 6 2 5 for the values to use in your calculations 5 3 6 Backlight Power The Bitsy Plus provides software control of Backlight Intensity and On Off using the ADSmartIO controller Power for the backlight is not routed through the board and must be supplied to the backlight separately from the Bitsy Plus This provides the greater flexibility when selecting backlight inverters for an application S...

Page 49: ...lators use conventional step down switchers under operating load conditions but are configured by the system for linear and burst mode20 operation during low load conditions that occur during system sleep Additionally there is only one level of cascaded regulation reducing the losses that multiply through each stage 5 4 Designing for Optimal Power Management Designing a system for optimal power ma...

Page 50: ...ascade through the 5 V supply Consider these loads when creating your power budget 5 4 2 Power Loads During Sleep When designing systems for minimal power consumption during Sleep mode make sure to consider DC losses to external connections The following are a few of the ways your system may leak when asleep PCMCIA and CF cards Cards in place when the system is asleep can drain power through the C...

Page 51: ...DC power System ground Ground BATPOS GND This diagram also illustrates how to connect a coin cell to the RTC circuit for systems that require the RTC to be maintained under all power conditions 5 5 2 Automotive System This system connects the Bitsy Plus directly to the vehicle battery but polls a sense line on the ignition to put the system to sleep when the vehicle is turned off Vehicle battery 1...

Page 52: ... own personality board Personality Board Bitsy Plus VBatt_Pos Ground Ground DCIN_Pos DC Line power Charger In this example DC Line power may come from a DC power supply battery or other DC power source The Bitsy Plus Personality Board ADS p n 170111 8000 includes an external battery charger using a design similar to the one depicted above For an illustration of how to use the onboard Bitsy Plus tr...

Page 53: ...e dimensions of the Bitsy Plus 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 ADS document number 630114 1000A 6 1 2 Mounting Holes Four holes are provided one on each corner for mounting The diameter of the holes is 0 138 in Mounting ho...

Page 54: ...fit in an enclosure as thin as 0 772 inch 19 6 mm I D Key clearances are as follows Highest component 0 425 inch 10 8 mm top 0 126 inch 3 20 mm bottom Board Thickness 0 062 inch 1 57 mm Clearance over top Bottom 0 05 inch 1 3 mm Note Selection of connectors and wiring harnesses will determine height of final assembly ...

Page 55: ... 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 2 7 3 Short Reset_In to GND to reset system 4 This is the voltage at VBATT_POS at which the DC_GOOD signal 4 3 7 changes from high to low which can trigger the system to g...

Page 56: ...le depends on system power budget 9 Systems are configured at the factory with buffers for 3 3 or 5 V panel data R289 selects 5 V power for the buffers while R288 selects 3 3 V power they re located under the opening for the PCMCIA header about 1cm from the right ejector corner of the board 5 V displays with Vih 0 6ŸVpnl_pwr 3 0 V will work reliably with 3 3 V data 10 PNL_RL is pulled up with R87 ...

Page 57: ...Ω tc Charging time from full discharge 5 min RTC Backup 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 section 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 ...

Page 58: ... LS520 backlight inverter which draws about six watts at full intensity Input Voltage Vbatt_pos Test Condition 6 5 V 9 V 12 V 15 V Units Sleep mode 18 20 22 25 mW CPU idle note 19 820 890 970 1000 mW CPU at max note 20 1630 1700 1800 1900 mW Notes Power consumption was measured under the following conditions 19 Fully populated 64 MiB Bitsy Plus with no peripheral connections System running only th...

Page 59: ...nce 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 digital I Os abo...

Page 60: ...tal Outputs Vol 0 0 4 V Voh 2 4 V Digital Inputs Vil 0 0 8 V Vih 2 0 3 5 V 6 2 8 USB The Bitsy Plus supports USB operation as described in section 4 5 2 The USB_PWR_SENSE and USB_PWR_CTRL lines are SA 1111 control lines See section 6 2 12 for their electrical characteristics Symbol Parameter Min Typ Max Units Host Port R_pwr_sense USB_PWR_SENSE Pull up to Vddx 47 kΩ 6 2 9 Audio For its audio sub s...

Page 61: ...z Rin_mic input impedance 12 5 kΩ Cin_mic DC blocking capacitor 1 µF Vmicpwr microphone power MIC_L R 5 V Rmicpwr microphone power series resistance 3 2 kΩ Audio Output Rl speaker load 4 8 Ω Vout Zspkr 4Ω differential mode 3 7 Vrms Vdc DC bias differential mode 0 5 Avdd Pspkr output power ea channel note 29 differential THD N 1 Rl 4Ω 1 0 2 2 W differential THD N 10 Rl 4Ω 1 0 2 7 W differential THD...

Page 62: ... 8 Vddx 6 2 11 Crystal Frequencies Agencies certifying the Bitsy Plus for compliance for radio frequency emissions typically need to know the frequencies of onboard oscillators The following table lists the frequencies of all crystals on the Bitsy Plus Note that the frequency of the StrongARM crystal X4 is multiplied internally by 4n where n is a value from 4 to 14 to achieve the processor core fr...

Page 63: ...tage note 30 3 3 5 0 5 0 V Digital Outputs Vol 0 Vddx Voh 1 0 Vddx Digital Inputs Vil Vddx 3 3 V 0 2 Vddx Vih Vddx 3 3 V 0 8 Vddx SPI Bus section 4 5 3 Bit rate 460 1840 kHz Notes 30 The CF port voltage is selected programmatically with the SA 1111 The socket is keyed for 5V tolerant CF cards PCMCIA CompactFlash Port and Expansion Bus The CompactFlash bus can be used as a digital expansion port on...

Page 64: ...lable depends on system power budget 5 4 1 32 Each card inserted in a PCMCIA or CF slot can drain up to 1 mW when the system is in Sleep mode 4 Vcc2 Rpcmcia 33 The PCMCIA CF voltage is software selectable External implementations of the CF bus i e on a Personality Board can hard wire the voltage to Vddx or to Vcc 34 The SA 1110 MECR register independently sets timings for the attribute IO and memo...

Page 65: ...rcapacitors VCON signal on display connector J1 low voltage contrast control of some passive displays Some subsystems on the Bitsy Plus can be powered off selectively Two power enable signals are available to manage power of off board peripherals Support for synchronous flash External interrupt EXT_IRQ3 SPI bus master SA 1111 I2C master functionality ADSmartIO Enhancements The power supply has bee...

Page 66: ... factory selected with R288 or R289 JP1 JP2 and JP5 formerly Vee settings have been removed JP4 has been changed from flat panel voltage select to Vee polarity select The BATPOS input no longer powers the system in sleep mode It only powers the RTC The 30V output has been removed UCB1200 codec and I O chip has been removed Digital I O functions EIO0 9 are handled by a programmable logic device The...

Page 67: ...ration lower noise Improved audio codec operation through additional power and ground partitioning Height of tallest component on bottom side of board reduced from 0 185 inches 4 70 mm to 0 126 inches 3 20 mm Changes Flash reset now controlled by system reset Resolves condition under which system will sometimes not reboot from hard reset PCMCIA power control updated to allow full cut off of power ...

Page 68: ...lus User s Manual Page 58 ADS document 110114 1001A Changes ADSmartIO voltage reference turns off when system is asleep Rtl thermistor base resistor changed from 3 3kΩ to 47kΩ to improve temperature resolution ...

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