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MAX4397 Datasheet(PDF) 17 Page - Maxim Integrated Products |
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MAX4397 Datasheet(HTML) 17 Page - Maxim Integrated Products |
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17 / 30 page  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 3–12 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 0.1Ω 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 75Ω resistor in series with all inputs and outputs to the SCART connector. For harsh environments where ±15kV protection is needed, the MAX4385E and MAX4386E single and quad high-speed op amps fea- ture the industry’s first integrated ±15kV ESD protection on video inputs and outputs. Audio/Video Switch for Dual SCART Connectors ______________________________________________________________________________________ 17 µC SCL 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 |
Similar Part No. - MAX4397_V01 |
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Similar Description - MAX4397_V01 |
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