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A-5 General Specs

Power Supply Input

The following table shows the supply voltage that is required by the T7. The USB hub, or 5V USB adapter should fall within the acceptable range.

Table A5-1.

Parameter Condition Min Typical Max Units
Supply Voltage   4.75   5.25 Volts
Supply Current No connected loads (1) 4 246 290 mA

1) Supply current will vary, depending on communication and enabled functionality. See Power Consumption section below for more details.  Total continuous supply current should be kept to 500 mA or less.

VS Outputs

The following table provides specifications for the VS outputs.

Table A5-2.

Parameter Condition Min Typical Max Units
Voltage (1)   4.75   5.25 Volts
Max Current 500 mA - Supply Current 200 mA

1) VS voltage is the same as the power supply voltage.

Power Consumption

The T7 has several power domains. USB and Core speed are not yet ready for user level control, but have been included in the following table to show the capabilities of the device. The values shown are typical.

Table A5-3.

Core Speed Eth (1) Eth Linked AINs WiFi WiFi Linked LEDs USB (1) Draw (mA) Typical Deviation (%)
80M ON Yes ON ON Yes ON ON 280 +/- 4
80M ON Yes ON ON No ON ON 280 +/- 3
80M ON Yes ON OFF No ON ON 246 +/- 4
80M ON No ON OFF No ON ON 200 +/- 5
80M OFF No ON OFF No ON ON 168 +/- 4
80M OFF No OFF OFF No ON ON 140 +/- 4
80M OFF No OFF OFF No OFF ON 94 +/- 11
80M OFF No OFF OFF No OFF OFF 86 +/- 9
20M OFF No OFF OFF No OFF OFF 28 +/- 18
2M OFF No OFF OFF No OFF OFF 10 +/- 20
250k OFF No OFF OFF No OFF OFF 6 +/- 33

1) Ethernet and USB require that the core be running at least 20MHz.

200µA and 100µA Current Sources

Table A5-4.

Parameter Condition Min Typical Max Units
Accuracy vs Cal Value (1) ~ 25 °C   ±0.1 ±0.2 %
Accuracy vs Nominal (1) ~ 25 °C     ±5 %
TempCo 200UA (2) ~ 25 °C       ppm/°C
TempCo 10UA (2) ~ 25 °C       ppm/°C
Maximum Voltage     VS - 2.0   volts

(1) First spec is the accuracy compared to the value stored during calibration. The second spec is the accuracy compared to the nominal value (e.g. 200.0 µA for the 200UA source).
(2) Tempco varies strongly with temperature. See the charts in the "200uA and 10uA" datasheet section.

VM+/VM-

Table A5-5.

Parameter Condition Min Typical Max Units
Typical Voltage No-load   ±13   volts
  @ 2.5 mA   ±12   volts
Maximum Current     2.5   mA

System Clock

Table A5-6.

Parameter Condition Min Typical Max Units
Clock Error ~ 25 °C     ±20 ppm
  -10 to 60 °C     ±50 ppm
  -40 to 85 °C     ±100 ppm

Mechanical

Table A5-7.

Parameter Condition Min Typical Max Units
USB Cable Length     2 5 meters
Operating Temperature   -40   85 °C
Screw Terminal Wire Gauge     26 14 AWG
Mounting Screws wood screw sizes #4 #6 #8  
Enclosure Screws (x6) PH1 pan head   #4-20 x 5/8"   Phil #1