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development platform, not part of a reference design. Therefore the source code for
these devices are provided as is, and with limited support. The product supported
fully is the source code for the reference designs such as the SB201.
One case where update of the USB1287 firmware can be relevant is if a different
communication protocol is desired to be used between the smart battery and the host.
During the development it can be desired to use the USB1287 as a gateway to
communicate with the smart battery via this interface/protocol. Changes and
extensions to the communication interface/protocol are left to the users to implement.
To program the tiny861, the USB cable must be disconnected, and the USB1287 will
release the SPI-lines which are used for inter-communication.
Figure 10-1. Programming interfaces for USB1287 and tiny861.
11 Buttons
Next to the USB1287 two buttons are present:
“Reset” will reset the USB1287 device and the Constant Current Load.
“HWB” will either enable the Charger for a short time to start the smart battery device,
or it will stop the Charger next time the button is pressed.
SB20x
SB201-1
SB201-2
Max Voltage
4200mV
8400mV
Max Current
100mA
100mA
Timeout
1min
1min
12 Status LED
An RGB LED is located between the buttons. This indicates the status of the
USB1287. When the LED is red the USB1287 is transmitting, and when it is green the
USB1287 is receiving. As transmission is so fast that the human eye cannot
distinguish the individual colors, the LED would appear yellow during transfers.
8
AVR459
8132A-AVR-10/08
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