Data Format of the I2C Interface I
參數(shù)資料
型號(hào)： MAX9595CTM+T
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 8/28頁(yè)
文件大小： 0K
描述： IC AUDIO/VIDEO SWIT DUAL 48TQFN
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 2,500
功能： 音頻/視頻切換
電路： 2 x SCART
電壓電源： 單/雙電源
電壓 - 電源，單路/雙路(±)： 4.75 V ~ 5.25 V，±11.4 V ~ 12.6 V
工作溫度： 0°C ~ 70°C
安裝類型： 表面貼裝
封裝/外殼： 48-WFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 48-TQFN-EP（7x7）
包裝： 帶卷 (TR)
MAX9595
Data Format of the I2C Interface
I2C Compatibility
The MAX9595 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 6 shows a typical I2C inter-
face application. The communication protocol supports
the standard I2C 8-bit communications. The MAX9595
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 MAX9595
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.
INTERRUPT_OUT Signal
INTERRUPT_OUT is an open-drain output that
becomes high impedance when a change in any of the
slow-switch signals occurs. Clear INTERRUPT_OUT by
setting bit 4 of register 01h low.
Applications Information
Hot-Plug of SCART Connectors
The MAX9595 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 MAX9595 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 MAX9595 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
±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 Connector
16
______________________________________________________________________________________
C
SCL
SDA
VVID
MAX9595
SCL
SDA
VDD
SCL
SDA
VDD
DEVICE 2
DEVICE 1
SDA
Figure 6. 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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