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2.3 Electrical Specifications
®
According to ETX
specifications, the ETX-A61 board needs to be supplied only with an external +5V
5 Volts standby voltage needs to be supplied for working in ATX mode.
For Real Time Clock working and CMOS memory data retention, it is also needed a backup battery voltage. It must be provided using pin 8 (BATT) of connector X4
(CN7).
All these voltages are supplied directly through ETX Connectors X1 (CN6), X2 (CN5), X3 (CN8) and X4 (CN7).
All remaining voltages needed for board's working are generated internally from +5V_S power rail.
According to ETX
®
specifications, the +3.3V_S voltage present on connector X1 pins 12, 16 and 24 is generated internally; therefore, it must be considered as a
power output for devices on the carrier board that need this voltage. According to ETX
500mA.
Since +3.3V_S is generated internally on ETX-A61 module, do not connect +3.3V_S pins to external 3.3V power supply units.
2.3.1
Power Rails meanings
In all the tables contained in this manual, Power rails are named with the following meaning:
_S: Switched voltages, i.e. power rails that are active only when the board is in ACPI's S0 (Working) state. Examples: +3.3V_S, +5V_S.
_A: Always-on voltages, i.e. power rails that are active both in ACPI's S0 (Working), S3 (Standby) and S5 (Soft Off) state. Examples: +5V_A, +3.3V_A.
_U: unswitched ACPI S3 voltages, i.e. power rails that are active both in ACPI's S0 (Working) and S3 (Standby) state. Examples: +1.5V_U.
2.3.2
Power Consumption
TBM
ETX-A61
ETX-A61 User Manual - Rev. First Edition: 1.0 - Last Edition: 1.2 - Author: S.B. - Reviewed by G.G. Copyright © 2017 SECO S.r.l.
± 5% voltage (+5V_S).
DC
®
specifications, maximum external load admitted on +3.3V_S power rail is
15
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