CyberResearch UMDAS 0802DA - Manual (Page 32)

Non-volatile memory
Table 4-13. Non-volatile memory specifications
EEPROM 1,024 bytes
Address Range Access Description
0x000-0x07F Reserved 128 bytes system data
0x080-0x1FF Read/write 384 bytes cal data
EEPROM Configuration
0x200-0x3FF Read/write 512 bytes user area
Microcontroller
Table 4-14. Microcontroller specifications
Type High performance 8-bit RISC microcontroller
Program memory 16,384 words
Data memory 2,048 bytes
Power
Table 4-15. Power specifications
Parameter Conditions Specification
Supply current (Note 10) 80 mA
Connected to self-powered hub
Connected to externally-powered root port hub 4.5 V min, 5.25 V max +5V USB power available
(Note 11)
Connected to bus-powered hub 4.1 V min, 5.25 V max
Connected to self-powered hub
Connected to externally-powered root port hub 420 mA max Output current (Note 12)
Connected to bus-powered hub 20 mA max
Note 10:
Note 11:
Note 12:
This is the total current requirement for the UMDAS 0802DA which includes up to 10 mA for the
status LED.
Self-powered hub refers to a USB hub with an external power supply. Self-powered hubs allow a
connected USB device to draw up to 500 mA.
Root port hubs reside in the PC’s USB host controller. The USB port(s) on your PC are root port
hubs. All externally powered root port hubs (desktop PCs) provide up to 500 mA of current for a
USB device. Battery-powered root port hubs provide 100 mA or 500 mA, depending upon the
manufacturer. A laptop PC that is not connected to an external power adapter is an example of a
battery-powered root port hub.
Bus powered hubs receive power from a self-powered or root port hub. In this case the maximum
current available from the USB +5 V is 100 mA. The minimum USB +5 V voltage level can be
as low as 4.1 V.
Output current refers to the total amount of current that can be sourced from the USB +5 V,
analog outputs and digital outputs.
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U MDAS 0802DA User's Guide Specifications