Evaluates: MAX4948 19-0991 Rev 0 10/07 MAX4948 Evaluation Kit General Description Features The MAX4948 evaluation kit (EV kit) evaluates the Powered by Host Interface MAX4948 hex single-pole/double-throw (SPDT) data Customized PCB switch. The EV kit utilizes the MAX4948 in a Secure Digital (SD) card application. The EV kit provides two SD PCB Plug (1.4mm Thickness) SD card sockets and a single SD card printed-circuit On-Board SD Card Sockets (P1, P2) board (PCB) plug. The supply voltage provided by the host interface powers the MAX4948 IC and any con- On-Board Power Indicator (LED1) nected SD memory cards. The MAX4948 EV kit is a customized PCB with an SD plug designed into the board. The PCB plug is Ordering Information designed to resemble an SD memory cards mechani- cal dimensions. The PCB plug measures 50.8mm x PART TYPE 24mm x 1.4mm. The mechanical specifications of an MAX4948EVKIT+ EV Kit actual SD memory card can be obtained from the SD +Denotes lead-free and RoHS-compliant. Card Association. Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION 16-pin, dual-row (2 x 8) vertical 1F 10%, 10V X5R ceramic J2 1 header (0.1in centers) capacitor (0603) C1 1 JU1, JU2 2 3-pin headers (0.1in centers) Murata GRM188R61A105K TDK C1608X5R1A105K LED1 1 Green surface-mount LED (0603) P1, P2 2 SD memory card socket (SMD) Not installed, ceramic capacitor C2 0 Not installed, resistorsshort (PC (0603) R1R18 0 trace) (0402) 0.1F 10%, 50V X5R ceramic R19 1 430 5% resistor (0603) capacitors (0603) C3, C4 2 TP1, TP2 2 Multipurpose test points Murata GRM188R71H104K TDK C1608X7R1H104K Maxim Hex SPDT data switch U1 1 MAX4948ETG+ (24-pin TQFN-EP) 24-pin, dual-row (2 x 12) vertical J1 1 22 Shunts header (0.1in centers) 1 PCB: MAX4948 Evaluation Kit+ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.MAX4948 Evaluation Kit Component Suppliers SUPPLIER PHONE WEBSITE Murata Mfg. Co., Ltd. 770-436-1300 www.murata.com TDK Corp. 847-803-6100 www.component.tdk.com Note: Indicate that you are using the MAX4948 when contacting these component suppliers. into the PCB and conforms to the dimensional stan- Quick Start dards of a thin SD memory card. The net effect is the Recommended Equipment ability to switch between two SD memory cards on a Before beginning, the following equipment is needed: single SD bus. SD card reader/SD card slot Enable and Configuration Computer with Windows 98SE/2000/XP/Vista oper- The EV kit is configured through jumpers JU1 and JU2. ating system Jumper JU2 is used to enable/disable the MAX4948 analog switches and jumper JU1 is used to switch Note: The MAX4948 EV kit does not require a driver or between the two SD card sockets, P1 and P2. software. The EV kit acts only as an SPDT switch, con- necting one of two SD memory cards to the hosts SD Enable (JU2) bus. The MAX4948 analog switch is enabled and disabled through jumper JU2. See Table 1 for jumper JU2 functions. Procedure The MAX4948 EV kit is fully assembled and tested. Table 1. Jumper JU2 Functions Follow the steps below to verify board operation: SHUNT 1) Verify that shunts are installed between each odd-and- EN PIN DESCRIPTION POSITION even pin of header J1 (i.e., between pins 1 and 2, pins 3 and 4, etc.). All switches are in a 1-2 Connected to VDD 2) Verify that shunts are installed between each odd-and- high-impedance state. even pin of header J2 (i.e., between pins 1 and 2, 2-3* Connected to GND All switches are on. pins 3 and 4, etc.). *Default position. 3) Verify that a shunt is installed across pins 1-2 of header JU1. This connects the NO inputs (from Configuration (JU1) socket P1) to the COM outputs. Based on jumper JU1s configuration, the signal lines from one of the SD card sockets (P1 or P2) are connect- 4) Verify that a shunt is installed across pins 1-2 of ed to the common (COM) terminals of the analog switch- header JU2. This powers on the analog switches. es (COM1COM6). The COM1COM6 terminals are then 5) Insert the SD PCB plug (P3) into the SD card read- routed through header J2 to the SD PCB plug (P3). See er/SD card slot. Table 2 for configuration options and Figure 1 for an 6) Verify that LED1 is illuminated. illustration of the MAX4948 analog switch connections. Detailed Description Table 2. MAX4948 Configuration The MAX4948 evaluation kit (EV kit) evaluates the CB PIN MAX4948 hex SPDT data switch. The EV kit is COM TERMINAL CONFIGURATION (JU1) designed for an SD application, providing two SD sock- ets and a single SD plug. Standard and thin SD memo- SD card socket (P1) ry cards can be inserted into the P1 and P2 sockets. Connected to NO VDD (1-2)* connected to the SD card The MAX4948 is then used to switch between the two terminal plug (P3) SD memory cards, connecting one of the cards to the SD plug. The SD plug can be inserted into any stan- SD card socket (P2) Connected to NC dard SD memory card slot. The SD plug is designed GND (2-3) connected to the SD card terminal plug (P3) Windows is a registered trademark of Microsoft Corp. *Default position. 2 Evaluates: MAX4948