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296 Posts

Posted - 30 Apr 2002 :  17:11:54  Show Profile  Email Poster
Bitsy Personality Board

The Bitsy Personality Board (also known as the Bitsy Connector Board) is a reference design that mates to the Bitsy, Bitsy Plus and BitsyX single-board computers. It is included with every Bitsy family evaluation system. Schematics are provided to assist with custom daughterboard development.

Changes, updates and errata for this document will appear as replies to this topic as they become available.

Features include:
  • 20+ connectors to break out the Bitsy's signals including:
    • USB host and function

    • audio speakers and headphones

    • Ethernet or CompactFlash

    • PS/2 keyboard

    • backlight

    • power

    • sleep/wakeup

    • serial ports
  • 0.100" LCD connector to mate with most ADS display cables

  • option for a 10/100BT Ethernet chip

  • IrDA transceiver

We use 9/16-inch standoffs between the Bitsy and the personality board (forum topic 817).

Schematic (topic)
Mechanical and assembly drawings (topic)

We published a user manual for Rev 1 of the Bitsy personality board (original PDF 133kB and revised/preliminary PDF 548kB). Because there are a number of differences bewteen rev 1 and rev A (including change of the I/O header from 40 pins to 30), we recommend using the schematic for best reference.

See the schematic topic for known issues about each board revision.

Edited by akidder 29-oct-02: Add assembly drawing to aid in locating connectors.
Edited by akidder 19-dec-02: Move known issues list to schematics topic
Edited by akidder 24-Nov-03: add rev A features to list
Edited by akidder 30-Jan-04: clarify that current manuals are for rev 1 boards
Edited by akidder 14-Oct-04: recommend schematics for best reference.
Edited by akidder 20-Apr-05: Add link to March 2003 standoff heigh link.

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296 Posts

Posted - 07 Jun 2002 :  16:12:42  Show Profile  Email Poster
Additional Header Part Numbers

Here are a few more part numbers that aren't currently listed in the user manual:

2x5 headers, 2mm (J18,J20,J22) SAMTEC# EHT-105-01-S-D

ADS Knowledge Base
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296 Posts

Posted - 02 Jul 2002 :  15:42:39  Show Profile  Email Poster
Erratum: J6, J34 and J35

J6, J34 and J35 are audio signals to and from the UDA1341 codec. The manuals currently posted incorrectly attribute them to the UCB1200.
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296 Posts

Posted - 10 Oct 2002 :  16:29:58  Show Profile  Email Poster
Addendum: Mating Connector for 2x5 Serial Headers

For the 2x5, 2mm headers used on serial headers J18, J20 and J22, the recommended mating connectors are Samtec TCSD series cable strips (connector with cable).

Eg. The keyed, six inch, single-ended TCSD cables we use in development systems' serial adapters are part number TCSD-05-S-06.00-01-N. See this topic for the cable drawing used to build these adapters.

See this topic for details about ordering Samtec cables.
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1519 Posts

Posted - 16 Oct 2002 :  17:44:37  Show Profile  Email Poster
Erratum: J19 on Rev 1 Boards

J19 is a 1x6, right-angle header, Molex p/n 22-05-3061. The mating connector is Molex p/n 22-23-2061. The current manual incorrectly states otherwise.

Edited by akidder 26-Sep-2006: Note that J19 applies only on Rev 1 Bitsy Personality boards.
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877 Posts

Posted - 04 Mar 2003 :  16:58:31  Show Profile  Email Poster

Erratum: JP5, JP6 Serial 2 Operation

The manual incorrectly states that to set Serial 2 for 3.3V CMOS operation, you should connect JP5.3 to JP6.2. Here is how to set the shunts (difference from manual shown in italics):

For Rev 1 boards
RS-232: As shown in manual
3.3V logic level: JP4 2-3, JP5.2 to JP6.2, JP7 2-3
IrDA: As shown in manual

For Rev 2 and A boards
RS-232: JP4 1-2, JP5 2-3, JP6 2-3, JP7 2-3
3.3V logic level: JP4 2-3, JP5 1-2, JP6 2-3, JP7 2-3
IrDA: As shown in manual

Edited by akidder 29-Jan-2004: Added settings for rev 2 and A boards (see also settings table in schematics).
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1519 Posts

Posted - 05 Mar 2003 :  18:10:04  Show Profile  Email Poster

Rev 1 to Rev 2 Changes

The following is a summary of the changes that were made to the Bitsy Personality Board between revisions 1 and 2:

  • Stuffing options available for use with Bitsy or Bitsy Plus

  • Battery Charger: Changed to Li ion charger

  • RTC Battery: Add connector J4 for external RTC battery; polarity changed

  • Ethernet: Transient suppression added to I/O lines

  • Ethernet: Interface transformer resistors updated

  • Ethernet: Connects only to EXT_IRQ1 (removed option to use CARDB_IRQ)

  • CompactFlash Bus: New circuit for power selection

  • Input Power: EMI filter added

  • USB: Host and function circuits updated

  • Audio: Add stereo headphone and microphone jacks

  • Serial 2: Corrects shunt settings for JP5 and JP6

  • J31 changed from 40 to 30 pins:

    - Codec control signals
    - ANINn A/D inputs
    - RS232 buffer shutdown
    - DIP switch positions 2 and 3
    - GPIO27_CLK
    - /EXT_IRQ1 and /EXT_IRQ2

    - /EXT_IRQ3

    - UCBn I/Os
    - ADSmartIO SMTIOn, ROWn and COLn I/Os
    - VREF A/D reference voltage
    Note: Personality board signals "UCB_IOn" on J31 correspond to the "EIOn" signals on J3 and J10 of the BitsyX and BitsyXb.

Edited by akidder 29-Jan-2004: Add Serial 2 changes.
Edited by akidder 14-Oct-2004: Add J31 changes.
Edited by akidder 16-May-2006: Add note about EIOn signals for BitsyX/Xb
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1519 Posts

Posted - 05 Mar 2003 :  18:13:09  Show Profile  Email Poster

Rev 2 to Rev A Changes

The following is a summary of the changes that were made to the Bitsy Personality Board between revisions 2 and A:

  • Battery Charger: adds on/off control from CPU

  • Battery Charger: adds output LED (D9)

  • RTC Battery: Add option to install one of three different coin cell batteries

  • IrDA: Add option to populate a connector for off-board IrDA

  • Ethernet: Connector includes integrated LEDs

  • Touch Panel Header: Changed back to standard (rev 2 was non-standard)

  • CompactFlash Bus: Improved power circuit prevents 3.3 and 5V from turning on at same time

  • CompactFlash Bus: Voltage sense resistors added

  • Functionality of power control signals changed as follows:

Signalrev 2rev A
PE2PS/2Serial 2 buffer
CF powerCFCF, Ethernet
IrDAonIrDA, Serial 2IrDA
Chargenot usedcharger

Note: We recommend that you do NOT use PE1 or PE2 for functions other than the ones listed, as the OS drivers may need to be rewritten or disabled to prevent unexpected changes to the digital I/Os. EIO and ADSmartIO are your best choices for I/Os.

Edited by akidder 6-June-2006: Add footnote about use of PE1 and PE2.
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1519 Posts

Posted - 13 Mar 2003 :  17:02:02  Show Profile  Email Poster

Technical Bulletin:
Revs. 2 and A: Ethernet Doesn't Connect to Network Under Some Conditions

Rev. 2 or A Bitsy Ethernet Personality Board board fails to connect to network. Lights on board blink regularly, but connection never established.

This issue appears to occur with very long Ethernet cables (longer than 20 meters/70 feet) and with some consumer-grade network hubs (e.g. Netgear DS108, but not DS104).

UPDATE! See below for resolution of this issue. -akidder 20nov03

Perform the rework described in topic 408
Use different network switch gear (try a hub instead of a switch).

Edited by akidder 7-Jan-2004: Add rev A to the affected products.
Add rework to workaround list.
Remove the following options from workaround list: "Use Bitsy Personality Board rev. A.; Use shorter network cables."
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1519 Posts

Posted - 08 Apr 2003 :  12:25:42  Show Profile  Email Poster

Power consumption

The Bitsy Personality Board adds to the system power consumption in Run and Sleep modes. In Run mode, the dominant power loss is from the 0.2-0.5V drop across the blocking diode (D3 in the pers. board battery charge circuit or the DCIN_POS diode on the Bitsy Plus). In our Run mode tests, the personality board itself added only 4-5 mA to system current draw.

In Sleep, the current drain is largely from passive components on the personality board. On a Bitsy system that drew 3.5 mA in Sleep, we found that with a Personality Board, the system drew 4.2 mA. The personality board added 20-25% to the system power consumption during Sleep.

If you experience higher current draws during Sleep, make sure that all subsystems on the personality board are turning off. For example, Bitsy Plus CE builds before 3.13 (Jan 2003) did not correctly turn off the IrDA transceiver before sleep, resulting in an additional 5mA current draw during Sleep. You might also take a look at the battery charging circuit.

Test conditions:
  • Bitsy Plus rev A (BOM 621114-1000A1)
  • Bitsy Personality Board rev A (BOM 621111-8001A, CompactFlash)
  • Power supply connected to pers bd J7.1 such that VBAT_POS=7.0V
  • (this kept Bitsy Plus power consumption the same with and without personality board)

Edited by akidder 11-Nov-2004: Add link to charger circuit post.
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1519 Posts

Posted - 30 Jun 2003 :  14:57:27  Show Profile  Email Poster
Update: Touch Panel Header (J15 -> J43)

Revisions 2 and later of the personality board changed the touch panel connector reference to J43.

The manuals posted refer to the connector as J15, which is now outdated.
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1519 Posts

Posted - 20 Nov 2003 :  18:20:52  Show Profile  Email Poster

Ethernet Connectivity Issue Resolved

It appears that a small hardware change will correct the Ethernet connectivity problem described above. See topic 408 for details.
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1519 Posts

Posted - 11 Nov 2004 :  14:58:18  Show Profile  Email Poster

Disable Battery Charger to Reduce Sleep Power Consumption

The personality board battery charging circuit draws power even when the system is asleep. This can raise system current from 2 mA to around 40mA.

If you are using the personality board with an application that requires low-power sleep, consider removing one of the components in series with the battery charger input power. These components include D8, R78 and R79, all of which are located on the underside of the board near the point where J9 and J10 meet J3.

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1519 Posts

Posted - 10 Aug 2005 :  15:33:57  Show Profile  Email Poster

Rev A Personality Board: Blinking Battery Charger LED

If the battery charge LED on the personality board is blinking, it may be due to the ADSmartIO firmware installed on the BitsyX.

While the blinking charger does not affect most applications, you may want to eliminate the blinking for peace of mind. Revision 4 of the BitsyX ADSmartIO code corrects this issue.

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0 Posts

Posted - 21 Sep 2006 :  08:10:02  Show Profile
The Bitsy Personality board we received uses a BQ2057WTS IC in the charger circuit. We would like to use a three series cell Li battery in our system. What considerations need to be considered in using this higher voltage? We believe a divider for the battery input of 20K to Q5-3 and 30.1K to ground will boost the charge level to the three cell requirement. Are there any other items which must be addressed?
Thanks for the help.
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0 Posts

Posted - 21 Sep 2006 :  09:17:34  Show Profile
Converting to three cell divider on the charger should be 10K and 20K.
10K to Q5 pin 3 junction to U13 pin 2 and 20K to ground.
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53 Posts

Posted - 26 Sep 2006 :  18:06:26  Show Profile  Email Poster
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