UMDAS 0802DA User's Guide

Specifications

Non-volatile memory

Table 4-13. Non-volatile memory specifications

EEPROM

1,024 bytes

 

 

EEPROM Configuration

Address Range

Access

Description

 

 

 

 

 

0x000-0x07F

Reserved

128 bytes system data

 

0x080-0x1FF

Read/write

384 bytes cal data

 

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

+5V USB power available

Connected to self-powered hub

4.5 V min, 5.25 V max

(Note 11)

Connected to externally-powered root port hub

 

 

Connected to bus-powered hub

4.1 V min, 5.25 V max

Output current (Note 12)

Connected to self-powered hub

420 mA max

 

Connected to externally-powered root port hub

 

 

Connected to bus-powered hub

20 mA max

Note 10: This is the total current requirement for the UMDAS 0802DA which includes up to 10 mA for the status LED.

Note 11: 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.

Note 12: 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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