Datasheet

Evaluates: MAX4948
MAX4948 Evaluation Kit
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Quick Start
Recommended Equipment
Before beginning, the following equipment is needed:
• SD card reader/SD card slot
• Computer with Windows
®
98SE/2000/XP/Vista oper-
ating system
Note: The MAX4948 EV kit does not require a driver or
software. The EV kit acts only as an SPDT switch, con-
necting one of two SD memory cards to the host’s SD
bus.
Procedure
The MAX4948 EV kit is fully assembled and tested.
Follow the steps below to verify board operation:
1) Verify that shunts are installed between each odd-and-
even pin of header J1 (i.e., between pins 1 and 2,
pins 3 and 4, etc.).
2) Verify that shunts are installed between each odd-and-
even pin of header J2 (i.e., between pins 1 and 2,
pins 3 and 4, etc.).
3) Verify that a shunt is installed across pins 1-2 of
header JU1. This connects the NO_ inputs (from
socket P1) to the COM outputs.
4) Verify that a shunt is installed across pins 1-2 of
header JU2. This powers on the analog switches.
5) Insert the SD PCB plug (P3) into the SD card read-
er/SD card slot.
6) Verify that LED1 is illuminated.
Detailed Description
The MAX4948 evaluation kit (EV kit) evaluates the
MAX4948 hex SPDT data switch. The EV kit is
designed for an SD application, providing two SD sock-
ets and a single SD plug. Standard and thin SD memo-
ry cards can be inserted into the P1 and P2 sockets.
The MAX4948 is then used to switch between the two
SD memory cards, connecting one of the cards to the
SD plug. The SD plug can be inserted into any stan-
dard SD memory card slot. The SD plug is designed
into the PCB and conforms to the dimensional stan-
dards of a thin SD memory card. The net effect is the
ability to switch between two SD memory cards on a
single SD bus.
Enable and Configuration
The EV kit is configured through jumpers JU1 and JU2.
Jumper JU2 is used to enable/disable the MAX4948
analog switches and jumper JU1 is used to switch
between the two SD card sockets, P1 and P2.
Enable (JU2)
The MAX4948 analog switch is enabled and disabled
through jumper JU2. See Table 1 for jumper JU2 functions.
Configuration (JU1)
Based on jumper JU1’s configuration, the signal lines
from one of the SD card sockets (P1 or P2) are connect-
ed to the common (COM) terminals of the analog switch-
es (COM1–COM6). The COM1–COM6 terminals are then
routed through header J2 to the SD PCB plug (P3). See
Table 2 for configuration options and Figure 1 for an
illustration of the MAX4948 analog switch connections.
Table 1. Jumper JU2 Functions
SHUNT
POSITION
EN PIN DESCRIPTION
1-2 Connected to VDD
All switches are in a
high-impedance state.
2-3* Connected to GND All switches are on.
* Default position.
Table 2. MAX4948 Configuration
CB PIN
(JU1)
COM_ TERMINAL CONFIGURATION
VDD (1-2)*
Connected to NO_
terminal
SD card socket (P1)
connected to the SD card
plug (P3)
GND (2-3)
Connected to NC_
terminal
SD card socket (P2)
connected to the SD card
plug (P3)
* Default position.
Windows is a registered trademark of Microsoft Corp.
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.