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鍙冩暩(sh霉)璩囨枡
| 鍨嬭櫉锛� | MAX4397SCTM+T |
| 寤犲晢锛� | Maxim Integrated Products |
| 鏂囦欢闋佹暩(sh霉)锛� | 9/30闋� |
| 鏂囦欢澶�?銆�?/td> | 0K |
| 鎻忚堪锛� | IC SW A/V SCART CON 48-TQFN |
| 鐢�(ch菐n)鍝佸煿瑷撴ā濉婏細 | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 妯欐簴鍖呰锛� | 2,500 |
| 椤炲瀷锛� | 闁嬮棞(gu膩n) |
| 鎳夌敤锛� | DVD锛屾闋傜洅锛岄浕瑕� |
| 瀹夎椤炲瀷锛� | 琛ㄩ潰璨艰 |
| 灏佽/澶栨锛� | 48-WFQFN 瑁搁湶鐒婄洡 |
| 渚涙噳鍟嗚ō(sh猫)鍌欏皝瑁濓細 | 48-TQFN-EP锛�7x7锛� |
| 鍖呰锛� | 甯跺嵎 (TR) |
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Data Format of the I2C Interface
I2C Compatibility
The MAX4397 is compatible with existing I2C 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 I2C inter-
face application. The communication protocol supports
the standard I2C 8-bit communications. The MAX4397
address is compatible with the 7-bit I2C addressing
protocol only; 10-bit format is not supported.
Digital Inputs and Interface Logic
The I2C-compatible, 2-wire interface has logic levels
defined as VIL = 0.8V and VIH = 2.0V. All of the inputs
include Schmitt-trigger buffers to accept low-transition
interfaces. The digital inputs are compatible with 3V
CMOS logic levels.
Programming
Connect DEV_ADDR to ground to set the MAX4397
write and read address as shown in Table 2.
Data Register Writing and Reading
Program the SCART video and audio switches by writ-
ing to registers 00h through 0Dh. Registers 00h through
0Eh can also be read, allowing read-back of data after
programming and facilitating system debugging. The
status register is read-only and can be read from
address 0Eh. See Tables 3鈥�12 for register program-
ming information.
Applications Information
Hot-Plug of SCART Connectors
The MAX4397 features 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 0.1 to a signal pin. The MAX4397 is
soldered on the PC board when it experiences such a
discharge. Therefore, the current spike flows through
the ESD protection diodes and is absorbed by the sup-
ply bypass capacitors, which have high capacitance
and low ESR.
To better protect the MAX4397 against excess voltages
during the cable discharge condition, place an addi-
tional 75 resistor in series with all inputs and outputs
to the SCART connector. For harsh environments where
卤15kV protection is needed, the MAX4385E and
MAX4386E single and quad high-speed op amps fea-
ture the industry鈥檚 first integrated 卤15kV ESD protection
on video inputs and outputs.
MAX4397
Audio/Video Switch for Dual SCART Connectors
______________________________________________________________________________________
17
C
SCL
SDA
VVID
MAX4397
SCL
SDA
VDD
SCL
SDA
VDD
DEVICE 2
DEVICE 1
SDA
Figure 7. Typical I2C Interface Application
ADDRESS PIN
STATE
WRITE
ADDRESS
READ ADDRESS
VVID
96h
97h
GNDVID
94h
95h
Table 2. Slave Address Programming
S
Slave Address
(Write address)
A
Register
Address
A
Data
A
P
Write Mode
S
Slave
Address
(Write
address)
A
Register
Address
A Sr
Slave
Address
(Read
address)
A Data
NA P
Read Mode
S = Start Condition, A = Acknowledge, NA = Not Acknowledge,
Sr = Repeat Start Condition, P = Stop Condition
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