FN7510.0 February 14, 2008 Sync Separator HSYNC Timing for 720p ISL59450 Serial Communications I
參數(shù)資料
型號: ISL59450IQZ
廠商: Intersil
文件頁數(shù): 27/37頁
文件大?。?/td> 0K
描述: IC SWITCH VID CRSSPNT 128-MQFP
標(biāo)準(zhǔn)包裝: 66
系列: *
33
FN7510.0
February 14, 2008
Sync Separator HSYNC Timing for 720p
ISL59450 Serial Communications
I2C Overview
The ISL59450 uses a 2-wire I2C serial bus for
communication with its host. SCL is the Serial Clock line,
driven by the host, and SDA is the Serial Data line, which
can be driven by all devices on the bus. SDA is open drain to
allow multiple devices to share the same bus
simultaneously.
Communication is accomplished in three steps:
1. The Host selects the ISL59450 with which it wishes to
communicate.
2. The Host writes the initial ISL59450 Configuration
Register address it wishes to write to or read from.
3. The Host writes to or reads from the ISL59450’s
Configuration Register. The ISL59450’s internal address
pointer auto increments, so to read registers 0x00
through 0x16, for example, one would write 0x00 in step
two, then repeat step four 28 times, with each read
returning the next register value.
The ISL59450 has a 7-bit address on the serial bus. The upper
6-bits are permanently set to 100010x, with the x determined by
the state of the Address pin (Table 3). This allows two
ISL59450s to be independently controlled while sharing the
same bus. The Address pin has an internal pull-down resistor
to pull the terminal low to set a zero.
The bus is nominally inactive, with SDA and SCL high.
Communication begins when the host issues a START
command by taking SDA low while SCL is high (Figure 34).
The ISL59450 continuously monitors the SDA and SCL lines
for the start condition and will not respond to any command
until this condition has been met. The host then transmits the
7-bit serial address plus a R/W bit, indicating if the next
transaction will be a Read (R/W = 1) or a Write (R/W = 0). If
the address transmitted matches that of any device on the
bus, that device must respond with an ACKNOWLEDGE
PARAMETER
DESCRIPTION
CONDITIONS
TYP
UNIT
tdHOUT
HOUT Timing Relative to Input
200
ns
tHOUT
Horizontal Output Width
5s
CONDITIONS: VD = 3.3V TA = +25°C
SYNCIN
tdHOUT
tHOUT
HOUT
PARAMETER
DESCRIPTION
CONDITIONS
TYP
@ 3.3V
UNIT
tdHOUT
HOUT Timing Relative to Input
90
ns
tHOUT
Horizontal Output Width
1.90
s
TABLE 3. I2C ADDRESS OPTIONS
B7
B6
B5
B4
B3
B2
B1
B0
HEX
A6
(MSB)
A5A4
A3A2
A1
A0
(Address) R/W
1
0
1
0
1/0 0x85/0x84
1
0
1
1/0 0x87/0x86
ISL59450
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