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Chapter 3 -- Instrument Circuitry--Reference 3000 Schematic/Block Diagrams
Notes for Figure 3-5:
Note the lack of a ground connection between the USB bus and the Reference 3000 circuitry.
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The EasyUSB firmware is loaded into EasyUSB RAM on power-up. The USB firmware can be updated
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over the USB via a selection in the Reference 3000 section in the Windows Device Manager.
The Power PC firmware is also transferred from ROM into RAM on power-up. The Power PC firmware
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can also be updated over the USB via a selection in the Reference 3000 section of the Windows
Device Manager. Time critical sections of the Power PC code are kept in the processor's fast cache
memory.
The term UART refers to a Universal Asynchronous Receiver Transmitter. It converts parallel data to a
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self-clocking serial bit stream. The UARTs send data at 6 Mbits/second.
The Bus Transceiver isolates bus activity on the Controller and Potentiostat boards. Only reads and
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write to locations on these boards generate bus activity. This reduces noise pick-up.
Each board in a Reference 3000 has local non-volatile data storage. This is used to save calibration
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data and board revision information. Unlike previous Gamry Instruments Potentiostats, the Reference
3000 calibration data is stored in the instrument, not in a data file. When a Reference 3000 is moved
from one computer to another, its calibration remains valid.
Figure 3-5
Microprocessors in the Reference 3000
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