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AVR459
13 DB101 support for portable demonstration
A DB101 can be placed on the female pin header. This is an alternative to using a PC
as host. The DB101 would typically only be used for demonstration, where
standalone battery powered operation is desired. Atmel does not provide firmware for
this.
13.1 Battery cells provided with SB200
Though the capacity of the cells is specified to 880mAh they are actually closer to
700mAh.
The cells have built in protection, which affects the characteristic of the battery. It can
be an advantage to use unprotected cells if a more correct behavior is desired.
However, it is recommended to use protected cells until the implementation is verified
to not allow overstress of the connected cells.
14 Communication Gateway
An AT90USB1287 AVR microcontroller acts as both communication gateway and
board controller. It passes messages from its USB interface to other units on the
SB200. The communication links on the SB200 is shown on Figure 14-1. The figure
also shows reference designs SB204 and SB202 which are not available upon
release of the SB200
Figure 14-1. Communication links on (and off) the SB200.
1
2
SH1 protocol
SBS on half duplex UART
Host
(PC)
Host
(DB101)
3
4
SBS on SMBus
SH1 protocol (write commands only)
USB
1
SPI
5
Word data (write commands only)
Half Duplex UART
2
SB200 Gateway
(USB1287)
SPI
4
SPI
5
3
SMBus
SB201-1
SB201-2
(HVA)
SB204
SB202
Smart
Charger
Electronic
Load
14.1 Communication protocol between the Host (PC) and the USB1287 gateway.
The SH1 protocol is built to be tested/invoked from a terminal, that’s the reason for all
the ASCII characters. The package uses a :
9
8132A-AVR-10/08
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