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5.2 Electrical Specification
Table 11 and Table 12 define the DC Characteristics of the CFAST card. Unless otherwise stated, conditions are:
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Vcc = 3.3V ± 5%
0°C to +70°C
The current is measured by connecting an amp meter in series with the Vcc supply. The meter should be set to
the 2A scale range, and have a fast current probe with an RC filter with a time constant of 0.1ms. Current
measurements are taken while looping on a data transfer command with a sector count of 128. Current
consumption values for both read and write commands are not to exceed the Maximum Average RMS Current
specified in Table 12.
Table 11: Absolute Maximum Conditions
Parameter
Input Power
Table 12: Input Power write and read
Symbol
VCC
Conditions
-0.3V to 3.6V
Mode
SATA II
SATA I
Maximum Average RMS Current
250mA
220mA
Conditions
- 40… +85 °C
5.3 LED and IO-pins
LED1 is the DASP signal and is held low for every command and is not driven in idle mode.
LED2 is the SATA link indicator and is driven low, if the SATA is connected and active.
LED1 and LED2 pin is driven low and only pulled up weakly. So this pin can be tied low by the host without
accidental current through these pins. The LED pins can be used to display the function of the card.
The LED1 and LED2 pins could drive up to 10mA directly for an LED with serial resistance to 3.3V. It is
recommended to use an LED driver circuit.
Figure 1: Examples for recommended LED driver circuits, but not necessary
IO1 pin is the write protect pin.
If this pin tied low, the card is write protected and rejects all write commands.
Swissbit AG
Industriestrasse 4
Swissbit reserves the right to change products or specifications without notice.
Revision: 0.92
CH-9552 Bronschhofen
Switzerland
www.swissbit.com
industrial@swissbit.com
F-240_data_sheet_CA-HxBV_Rev092.doc
Page 10 of 56
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