Kontron SMARC Evaluation Carrier - Manual (Page 29)

User’s Guide
29 www.kontron.com
6.5 SD Card Slot
An industry standard micro-SD Card slot is located on the back of the Eval Carrier, in position J74. It supports 3.3V SD
cards.
Jumper J49 may be open to write-protect the card. To allow the card to be written to, leave J49 closed.
6.6 Micro SIM Site
The PCI Express Mini Card Electromechanical Specification defines connection pins for a SIM (“Subscriber Identity
Module”) card. In the PCI-SIG document, it is referred to as a UIM (“User Identity Module). The SMARC Evaluation
Carrier implements a micro-SIM slot at position J73, on the back of the Evaluation Carrier. The connector part used is a
6 pin 15mm x 12mm micro SIM connector, Molex 470230001.
6.7 RTC Battery Clip
A socket connector for a 20mm diameter 3V lithium coin cell battery is available on the Evaluation Carrier in position
BT1. The connector socket used is Renata SMTU2032-LF. A suitable battery is Panasonic CR2032.
The battery ‘+’ terminal is protected against charging (as required by safety regulations) by a series Schottky diode and
a 1K resistor (R147). The 1K resistor feeds the SMARC VDD_RTC pin (SMARC pin S147).
The Evaluation Carrier also has a 0.2F “SuperCap” that may be loaded to supply a backup voltage to the SMARC
VDD_RTC, instead of the battery. The SuperCap is at position C134, and connects to the SMARC VDD_RTC pin through a
1K resistor, at position R151.
6.8 SMARC Module Connector
The SMARC Module is supported on J40. This is a 314 pin MXM3 style connector. The J40 pin-out conforms to the ULP-
COM Module specification. Both 1.8V and 3.3V Module I/O can be supported on the Evaluation Carrier.
The MXM3 style connector used on the Evaluation Carrier is a low profile part, with a board-to-board spacing of 1.5mm.
The Evaluation Carrier has captive M2.5 threaded standoffs in the SMARC mounting hole positions. The standoffs
accept M2.5 screws, inserted from above, through the Module holes.
Both 82mm x 50mm and 82mm x 80mm format SMARC Modules may be used with the Evaluation Carrier. The
Evaluation Carrier PCB has a cut-out allowing access to the back side of the SMARC Module for test and debug.