參數(shù)資料
型號： SAA7705H
廠商： NXP SEMICONDUCTORS
元件分類： 消費家電
英文描述： Car radio Digital Signal Processor（DSP）(車載電臺數(shù)字信號處理器)
中文描述： SPECIALTY CONSUMER CIRCUIT, PQFP80
文件頁數(shù)： 34/60頁
文件大小： 1857K
代理商： SAA7705H
1999 Aug 16
34
Philips Semiconductors
Preliminary specification
Car radio Digital Signal Processor (DSP)
SAA7705H
12 I
2
C-BUS INTERFACE AND PROGRAMMING
12.1
I
2
C-bus interface
12.1.1
C
HARACTERISTICS OF THE
I
2
C-
BUS
The I
2
C-bus is used for 2-way, 2-line communication
between different ICs or modules. The two lines are a
serial data line (SDA) and a serial clock line (SCL). Both
lines must be connected to V
DD
via a pull-up resistor when
connected to the output stages of a microcontroller. For a
400 kHz clock frequency the recommendations of Philips
Semiconductors for this type of bus must be followed e.g.
up to loads of 200 pF at the bus a pull-up resistor can be
used; loads between 200 to 400 pF need a current source
or switched resistor. Data transfer can only be initiated
when the bus is not busy.
12.1.2
B
IT TRANSFER
One data bit is transferred during each clock pulse;
see Fig.13. The data on the SDA line must remain stable
during the HIGH period of the clock pulse as changes in
the data line at this time will be interpreted as control
signals. The maximum clock frequency is 400 kHz. To be
able to run on this high frequency all the I/Os connected to
this bus must be designed for this high speed according to
the Philips specification.
12.1.3
S
TART AND STOP CONDITIONS
Both data and clock line will remain HIGH when the bus is
not busy. A HIGH-to-LOW transition of the data line while
the clock is HIGH is defined as a START condition (S).
A LOW-to-HIGH transition of the data line while the clock
is HIGH is defined as a STOP condition (P); see Fig.14.
Fig.13 Bit transfer on the I
2
C-bus.
handbook, full pagewidth
MBC621
data line
stable;
data valid
change
of data
allowed
SDA
SCL
Fig.14 START and STOP condition.
handbook, full pagewidth
MBC622
SDA
SCL
P
STOP condition
SDA
SCL
S
START condition
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相關代理商/技術參數(shù)
參數(shù)描述
SAA7706H 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Car radio Digital Signal Processor (DSP)
SAA7706H/N107 功能描述:數(shù)字信號處理器和控制器 - DSP, DSC DIGITAL SIGNAL PROCESSOR RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時器數(shù)量:3 設備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風格:SMD/SMT
SAA7706H/N107,518 功能描述:數(shù)字信號處理器和控制器 - DSP, DSC DIRAC-1 RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時器數(shù)量:3 設備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風格:SMD/SMT
SAA7706H/N107,557 功能描述:數(shù)字信號處理器和控制器 - DSP, DSC DIGITAL SIGNAL RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時器數(shù)量:3 設備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風格:SMD/SMT
SAA7706H/N107S,518 功能描述:數(shù)字信號處理器和控制器 - DSP, DSC CAR RADIO DIGITAL SIGNAL PROCESSOR RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時器數(shù)量:3 設備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風格:SMD/SMT
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