19-0991; Rev 0; 10/07
MAX4948 Evaluation Kit
General Description
The MAX4948 evaluation kit (EV kit) evaluates the
MAX4948 hex single-pole/double-throw (SPDT) data
switch. The EV kit utilizes the MAX4948 in a Secure
Digital (SD) card application. The EV kit provides two
SD card sockets and a single SD card printed-circuit
board (PCB) plug. The supply voltage provided by the
host interface powers the MAX4948 IC and any con-
nected SD memory cards.
The MAX4948 EV kit is a customized PCB with an SD
plug designed into the board. The PCB plug is
designed to resemble an SD memory card’s mechani-
cal dimensions. The PCB plug measures 50.8mm x
24mm x 1.4mm. The mechanical specifications of an
actual SD memory card can be obtained from the SD
Card Association.
♦
Powered by Host Interface
♦
Customized PCB
♦
SD PCB Plug (1.4mm Thickness)
♦
On-Board SD Card Sockets (P1, P2)
♦
On-Board Power Indicator (LED1)
Features
Evaluates: MAX4948
Ordering Information
PART
MAX4948EVKIT+
TYPE
EV Kit
+Denotes
lead-free and RoHS-compliant.
Component List
DESIGNATION
QTY
DESCRIPTION
1µF ±10%, 10V X5R ceramic
capacitor (0603)
Murata GRM188R61A105K
TDK C1608X5R1A105K
Not installed, ceramic capacitor
(0603)
0.1µF ±10%, 50V X5R ceramic
capacitors (0603)
Murata GRM188R71H104K
TDK C1608X7R1H104K
24-pin, dual-row (2 x 12) vertical
header (0.1in centers)
DESIGNATION
J2
JU1, JU2
LED1
P1, P2
R1–R18
R19
TP1, TP2
U1
—
—
QTY
1
2
1
2
0
1
2
1
22
1
DESCRIPTION
16-pin, dual-row (2 x 8) vertical
header (0.1in centers)
3-pin headers (0.1in centers)
Green surface-mount LED (0603)
SD memory card socket (SMD)
Not installed, resistors—short (PC
trace) (0402)
430Ω ±5% resistor (0603)
Multipurpose test points
Maxim Hex SPDT data switch
MAX4948ETG+ (24-pin TQFN-EP)
Shunts
PCB: MAX4948 Evaluation Kit+
C1
1
C2
0
C3, C4
2
J1
1
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAX4948 Evaluation Kit
Evaluates: MAX4948
Component Suppliers
SUPPLIER
Murata Mfg. Co., Ltd.
TDK Corp.
PHONE
770-436-1300
847-803-6100
WEBSITE
www.murata.com
www.component.tdk.com
Note:
Indicate that you are using the MAX4948 when contacting these component suppliers.
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
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.
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.
Enable (JU2)
The MAX4948 analog switch is enabled and disabled
through jumper JU2. See Table 1 for jumper JU2 functions.
Table 1. Jumper JU2 Functions
SHUNT
POSITION
1-2
2-3*
EN
PIN
Connected to VDD
Connected to GND
DESCRIPTION
All switches are in a
high-impedance state.
All switches are on.
*Default
position.
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.
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
Windows is a registered trademark of Microsoft Corp.
2
Table 2. MAX4948 Configuration
CB PIN
(JU1)
VDD (1-2)*
COM_ TERMINAL
Connected to NO_
terminal
CONFIGURATION
SD card socket (P1)
connected to the SD card
plug (P3)
SD card socket (P2)
connected to the SD card
plug (P3)
GND (2-3)
Connected to NC_
terminal
*Default
position.
_______________________________________________________________________________________
MAX4948 Evaluation Kit
Evaluates: MAX4948
LOGIC
P1DAT2
NO1
NC1
P1DAT3
NO2
NC2
P1CMD
P1
SD CARD SOCKET
NO3
NC3
P1CLK
NO4
NC4
P1DAT0
NO5
NC5
P1DAT1
NO6
NC6
S6
S5
COM6
P3DAT1
S4
COM5
P3DAT20
S3
COM4
P3CLK
S2
COM3
P3CMD
S1
COM2
P3DAT3
COM1
P3DAT2
P3
SD CARD PLUG
(PCB PLUG)
MAX4948
P2DAT2
P2DAT3
*ASSUMING SHUNTS ARE INSTALLED BETWEEN EACH HORIZONTALLY
ADJACENT PIN (EVEN-TO-ODD) ON HEADERS J1 AND J2.
P2CMD
P2
SD CARD SOCKET
P2CLK
P2DAT0
P2DAT1
Figure 1. MAX4948 Switch Connections
_______________________________________________________________________________________
3
MAX4948 Evaluation Kit
Evaluates: MAX4948
SD Sockets
The two on-board SD card sockets accommodate both
a standard SD memory card and a thin SD memory
card. The pinout for each SD socket is listed in Table 3.
Header J2
The 16-pin, dual-row header (J2) connects the
COM1–COM6 terminals to the PCB plug (P3). In addi-
tion, the VDD supply voltage from the SD card reader/SD
card port is routed through J2 to each VCC pin of socket
P1 and P2. See Table 5 for a pin-to-pin association
between J2, the PCB plug, and the switches’
COM terminals.
Table 3. P1 and P2 Pinout
SD
DAT1
DAT0
GND
CLK
VCC
GND
CMD
DAT3
DAT2
P1 PIN
8
7
6
5
4*
3
2
1
9
P2 PIN
8
7
6
5
4**
3
2
1
9
Table 5. J2 Pinout
PIN
ASSOCIATION
COM6
COM5
COM4
P1-4
P2-4
COM3
COM2
COM1
J2 PIN
(ODD)
1
3
5
7*
9*
11
13
15
J2 PIN
(EVEN)
2
4
6
8**
10**
12
14
16
P3 PLUG
PIN
P3-8
P3-7
P3-5
P3-4
P3-4
P3-2
P3-1
P3-9
*Shunted
to VDD at header J2 (J2-7 to J2-8).
**Shunted
to VDD at header J2 (J2-9 to J2-10).
Header J1
The 24-pin, dual-row header (J1) connects the P1 and
P2 SD sockets to the normally open (NO) and normally
closed (NC) terminals. The P1 socket is connected
through header J1 to the switches’ NO terminals
(NO1–NO6). The P2 socket is connected through head-
er J1 to the switches’ NC terminals (NC1–NC6). See
Table 4 for a pinout of header J1.
*VCC:
SD memory card supply voltage.
**VDD:
Host-interface supply voltage.
SD PCB Plug
The MAX4948 EV kit was designed on a customized
PCB to allow for actual application evaluation. The SD
plug (P3) is an extension of the PCB and can be insert-
ed into a standard SD card socket. This design allows
two SD memory cards to be switched into a single SD
card socket. See Table 6 for the SD plug’s net associa-
tions. The pinout and dimensions of the SD plug are
shown in Figures 2 and 3.
Table 4. J1 Pinout
NET
P1DAT1
P2DAT1
P1DAT0
P2DAT0
P1CLK
P2CLK
P1CMD
P2CMD
P2DAT3
P1DAT3
P2DAT2
P1DAT2
J1 PIN
(ODD)
1
3
5
7
9
11
13
15
17
19
21
23
J1 PIN
(EVEN)
2
4
6
8
10
12
14
16
18
20
22
24
MAX4948 (U1)
PIN
NO6
NC6
NO5
NC5
NO4
NC4
NO3
NC3
NC2
NO2
NC1
NO1
Table 6. SD Plug Pinout
NET NAME
SD8
SD7
GND
SD5
VDD
GND
SD2
SD1
SD9
P3 PIN
8
7
6
5
4
3
2
1
9
SD
DAT1
DAT0
GND
CLK
VDD
GND
CMD
DAT3
DAT2
4
_______________________________________________________________________________________
MAX4948 Evaluation Kit
Evaluates: MAX4948
DAT1
DAT0
GND
CLK
VDD
GND
CMD
DAT3
DAT2
9
8
7
6
5
4
3
2
1
Figure 2. PCB Plug (P3) Pinout
86.4mm
50.8mm
31.2mm
86.4mm
5.7mm
24mm
1.4mm
31.2mm
Figure 3. PCB Plug (P3) Dimensions
_______________________________________________________________________________________
5
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