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3.2 Connectors description
3.2.1
FAN Connector
FAN Connector - CN3
Pin
Signal
1
GND
2
FAN_POWER
3
FAN_TACHO_IN
FAN_POWER: +5V_S derived power rail for FAN, managed by the embedded microcontroller via PWM signal.
FAN_TACHO_IN: tachometric input from the fan to the embedded microcontroller, +3.3V_S electrical level signal.
3.2.2
SATA connectors
Optional SATA #0
Connector - CN3
Pin
Signal
1
GND
2
SATA0_TX+
3
SATA0_TX-
4
GND
5
SATA0_RX-
6
SATA0_RX+
7
GND
μSD Card Slot
3.2.3
The SOCs used on ETX-A61 module offer a SD 3.0 compliant interface, that can be used to implement another mass storages media other than the optional
internal eMMC and the two SATA/PATA interfaces.
This SD interface is carried to a standard μSD card slot, soldered on top side of the module, push-push type.
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.
Depending on the usage model of ETX-A61 module, for critical applications/environments on the module itself it is available a 3-
pin dedicated connector for an external +5V
FAN Connector is a 3-pin single line SMT connector, type MOLEX 53261-0319 or equivalent, with pinout shown in
the table on the left.
Mating connector: MOLEX 51021-0300 receptacle with MOLEX 50079-8000 female crimp terminals.
Please be aware that the use of an external fan depends strongly on customer's application/installation.
Please refer to chapter 5.1 for considerations about thermal dissipation.
The SOCs used on ETX-A61 module have an integrated S-ATA controller, which offers a
Optional SATA #1
SATA II, 3.0 Gps interface, capable to use up to two independent devices. These two
Connector - CN2
channels can be carried out on externally on connectors CN2 and CN3, which are standard
right-angle S-ATA connectors, to be used for connection of external Mass Storage Devices.
Pin
Signal
Both these connectors are optional, since the two SATA channels can be used
1
GND
(as a factory option) to drive a SATA-to-PATA bridge, which will make available
the primary and/or the secondary IDE Channel on ETX connector X4 (CN7).
2
SATA1_TX+
Please also check par. 3.2.5.10.
3
SATA1_TX-
4
GND
5
SATA1_RX-
6
SATA1_RX+
7
GND
FAN.
DC
20
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