- 您现在的位置：买卖IC网 > PDF目录44572 > LM79CCVFX (NATIONAL SEMICONDUCTOR CORP) SPECIALTY ANALOG CIRCUIT, PQFP44 PDF资料下载
参数资料
| 型号： | LM79CCVFX |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PQFP44 |
| 封装： | 10 X 10 MM, PLASTIC, QFP-44 |
| 文件页数： | 7/31页 |
| 文件大小： | 469K |
| 代理商： | LM79CCVFX |
第1页第2页第3页第4页第5页第6页当前第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页
Functional Description (Continued)
2.2 Serial Bus Interface
When using the Serial Bus Interface a write will always con-
sist of the LM79 Serial Bus Interface Address byte, followed
by the Internal Address Register byte, then the data byte.
There are two cases for a read:
1.
If the Internal Address Register is known to be at the de-
sired Address, simply read the LM79 with the Serial Bus
Interface Address byte, followed by the data byte read
from the LM79.
2.
If the Internal Address Register value is unknown, write
to the LM79 with the Serial Bus Interface Address byte,
followed by the Internal Address Register byte. Then re-
start the Serial Communication with a Read consisting of
the Serial Bus Interface Address byte, followed by the
data byte read from the LM79.
In all other respects the LM79 functions identically for Serial
Bus communications as it does for ISA communications.
Auto-Increment does not operate. When writing to or reading
from a Register which Auto-Increments with ISA communica-
tions, the Register must be manually incremented for Serial
Bus communications.
The default power on Serial Bus address for the LM79 is:
0101101 binary. This address can be changed by writing any
desired value to the Serial Bus address register, which can
be done either via the ISA or Serial Bus. During and Serial
Bus communication on the BUSY bit (bit 7) in the address
register at x5h will be high, and any ISA activity in that situ-
ation should be limited to reading port x5h only.
All of these communications are depicted in the Serial Bus
Interface Timing Diagrams as shown in
Figure 7.
DS100036-10
(a) Serial Bus Write to the Internal Address Register followed by the Data Byte
DS100036-11
(b) Serial Bus Write to the Internal Address Register Only
DS100036-12
(c) Serial Bus Read from a Register with the Internal Address Register Preset to Desired Location
FIGURE 7. Serial Bus Timing
LM79
www.national.com
15
相关PDF资料 |
PDF描述 |
|---|---|
| LM86BIMQX | SPECIALTY ANALOG CIRCUIT, PDSO24 |
| LM85BIMQ/NOPB | SPECIALTY ANALOG CIRCUIT, PDSO24 |
| LM9140BYZ-5.0X | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 5 V, PBCY3 |
| LM9140BYZ-4.1X | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 4.096 V, PBCY3 |
| LM9140BYZ-5.0 | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 5 V, PBCY3 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LM79GCP | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Negative Adjustable Voltage Regulator |
| LM79L | 制造商:NSC 制造商全称:National Semiconductor 功能描述:3-Terminal Negative Regulators |
| LM79L00 | 制造商:FCI 制造商全称:First Components International 功能描述:LM79L00 Series 3-Terminal Negative Output voltage Regulators |
| LM79L05 | 制造商:KEXIN 制造商全称:Guangdong Kexin Industrial Co.,Ltd 功能描述:Three-terminal negative voltage regulator |
| LM79L05A | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:3-Terminal 0.1A Negative Voltage Regulator |
发布紧急采购，3分钟左右您将得到回复。