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7 Board Revision History
7.1
Identifying the board revision
The product revision number of the Bitsy Plus is etched on the underside of the printed circuit
board. That number is 170114-1000x, where "x" is the board revision.
7.2
Revision History
7.2.1
Revision 2
Initial release. If you are using a Bitsy Plus as a replacement for the Bitsy, please note these
changes from the Bitsy (rev C):
New Features
AC'97 stereo codec with improved signal to noise ratio
Burr-Brown touch-panel controller. A five-wire controller can be installed as a factory option.
Supports wakeup from touch screen.
Real-time clock circuit with micro power sleep
Option to populate supercapacitors
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 been redesigned for improved efficiency and higher input voltage range
Improved Vee generator for passive panel support
Additional ground and power connections on J3 and J10
Improved analog performance for audio system
EIOn digital I/Os can source and sink significantly more current (section 6.2.7)
Changes
DIP switch S1 has two positions instead of four
Voltage "3.3V" is now the same as "VDDX"
Voltages Vddx and Vcc are always on.
Touch panel connector J8 removed. Signals are available on J3.
ADS document # 110114-1001A
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