MAX4397DCTM+T Maxim Integrated Products, MAX4397DCTM+T Datasheet - Page 17

• Manufacturer Part Number: MAX4397DCTM+T
• Description: IC SW A/V SCART CON 48-TQFN
• Manufacturer: Maxim Integrated Products
• Type: Switchr

Specifications of MAX4397DCTM+T

• Applications: DVD, Set-Top Boxes, TV
• Mounting Type: Surface Mount
• Package / Case: 48-TQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Write Mode
Read Mode
S = Start Condition, A = Acknowledge, NA = Not Acknowledge,
Sr = Repeat Start Condition, P = Stop Condition
The MAX4397DA/SA are compatible with existing I
systems. SCL and SDA are high-impedance inputs.
SDA has an open drain that pulls the bus line to a logic-
low during the 9th clock pulse. Figure 7 shows a typical
I
supports the standard I
MAX4397DA/SA address is compatible with the 7-bit I
addressing protocol only; 10-bit format is not supported.
The I
defined as V
include Schmitt-trigger buffers to accept low-transition
interfaces. The digital inputs are compatible with 3V
CMOS logic levels.
Figure 7. Typical I
2
Audio/Video Switch for Dual SCART Connectors
S
S
C interface application. The communication protocol
address)
Address
(Write
Slave
(Write address)
2
Slave Address
C-compatible, 2-wire interface has logic levels
SDA
Digital Inputs and Interface Logic
µC
IL
A
SCL
= 0.8V and V
2
Register
Address
C Interface Application
______________________________________________________________________________________
Data Format of the I
A
2
A Sr
C 8-bit communications. The
Register
Address
IH
SDA
SDA
SDA
SCL
SCL
SCL
MAX4397DA/SA
address)
Address
= 2.0V. All of the inputs
(Read
Slave
DEVICE 1
DEVICE 2
I
2
C Compatibility
A
V
V
V
A Data NA P
VID
DD
DD
Data
2
C Interface
A
P
2
2
C
C
Connect DEV_ADDR to ground to set the MAX4397DA/SA
write and read address as shown in Table 2.
Program the SCART video and audio switches by writ-
ing to registers 00h through 0Dh. Registers 00h through
0Eh can also be read, allowing readback of data after
programming and facilitating system debugging. The
status register is read-only and can be read from
address 0Eh. See Tables 3–12 for register program-
ming information.
The MAX4397DA/SA feature high-ESD protection on all
SCART inputs and outputs, and requires no external
transient-voltage suppressor (TVS) devices to protect
against floating chassis discharge. Some set-top boxes
have a floating chassis problem in which the chassis is
not connected to earth ground. As a result, the chassis
can charge up to 500V. When a SCART cable is con-
nected to the SCART connector, the charged chassis
can discharge through a signal pin. The equivalent cir-
cuit is a 2200pF capacitor charged to 311V connected
through less than 0.1Ω to a signal pin. The
MAX4397DA/SA are soldered on the PCB when it expe-
riences such a discharge. Therefore, the current spike
flows through the ESD protection diodes and is
absorbed by the supply bypass capacitors, which have
high capacitance and low ESR.
To better protect the MAX4397DA/SA against excess
voltages during the cable discharge condition, place
an additional 75Ω resistor in series with all inputs and
outputs to the SCART connector. For harsh environ-
ments where ±15kV protection is needed, the
MAX4385E and MAX4386E single and quad high-
speed op amps feature the industry’s first integrated
±15kV ESD protection on video inputs and outputs.
Table 2. Slave Address Programming
ADDRESS PIN
GNDVID
STATE
V
VID
Data Register Writing and Reading
Applications Information
Hot Plug of SCART Connectors
ADDRESS
WRITE
96h
94h
READ ADDRESS
Programming
97h
95h
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