MAX4585EUB+ Maxim Integrated Products, MAX4585EUB+ Datasheet - Page 9

• Manufacturer Part Number: MAX4585EUB+
• Description: IC AUDIO/VIDEO SWITCH 10UMAX
• Manufacturer: Maxim Integrated Products

Specifications of MAX4585EUB+

• Function: Audio/Video Switch
• Circuit: 1 x SPST - NO, 1 x SPDT
• On-state Resistance: 65 Ohm
• Voltage Supply Source: Single Supply
• Voltage - Supply, Single/dual (±): 2.7 V ~ 5.5 V
• Current - Supply: 5µA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

es the associated switch (Table 2). A logic “0” in any
data-bit location opens the associated switch.
The MAX4584 uses a 2-wire I
face. The COM_ register uses the “SendByte” protocol,
which consists of an address byte followed by a com-
mand byte (Table 1).
To address a given IC, bit A in the address byte must
duplicate the value present at the A pin of that IC. The
rest of the address bits must match those shown in
Table 3. The command byte details are described in
the Switch Control section.
The 2-wire serial interface requires only two I/O lines of
a standard microprocessor (µP) port. Figures 1 and 2
detail the timing diagram for signals on the 2-wire bus,
and Tables 1 and 3 detail the format of the signals. The
MAX4584 is a receive-only device and must be con-
trolled by the bus master device. A bus master device
communicates by transmitting the address byte of the
slave device over the bus and then transmitting the
desired information. Each transmission consists of a
start condition, an address byte, a command byte, and
finally a stop condition. The slave device acknowledges
Table 1. Command-Bit Mapping
X = Don’t care
Figure 2. A Complete 2-Wire Serial-Interface Transmission
COMMAND
D7 (MSB)
D0 (LSB)
BIT
D6
D5
D4
D3
D2
D1
NO1B to COM1
NO1A to COM1
NO2 to COM2
SWITCH
X
X
X
X
X
_______________________________________________________________________________________
SDA
SCL
START CONDITION
2-Wire Serial Interface
TERMINALS
2
C-compatible serial inter-
10, 1
6, 7
9, 1
—
—
—
—
—
MSB
SLAVE ADDRESS BYTE
POWER-UP
1 (Closed)
0 (Open)
0 (Open)
STATE
X
X
X
X
X
LSB
ACK
MSB
the recognition of its address by pulling the SDA line
low for one clock period after the address byte is trans-
mitted. The slave device also issues a similar acknowl-
edgment after the command byte.
The bus master signals the beginning of a transmission
with a start condition by transitioning SDA from high to
low while SCL is high. When the bus master has fin-
ished communicating with the slave device, it issues a
stop condition by transitioning SDA from low to high
while SCL is high. The bus is then free for another
transmission.
The MAX4584 uses an 8-bit-long slave address. To
select a slave address, connect A to V+ or GND. The
MAX4584 has two possible slave addresses, so a maxi-
mum of two of these devices may share the same
address line. The slave device MAX4584 monitors the
serial bus continuously, waiting for a start condition fol-
lowed by an address byte. When a slave device recog-
nizes its address (01101A10), it acknowledges that it is
ready for further communication by pulling the SDA line
low for one clock period.
Table 2. Truth Table
Table 3. Address Bit Map
COMMAND BYTE
Audio/Video Switches
ADDRESS BIT (A)
Serially Controlled
LOGIC
0
1
0
1
LSB
ACK
STOP CONDITION
Slave Address (Address Byte)
Start and Stop Conditions
NO1_ AND NO2
ADDRESS
0110 1010
0110 1110
CLOSED
OPEN
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