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參數(shù)資料
| 型號(hào)： | FM30C256-S |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 256Kb Data Collector |
| 中文描述： | 256Kb的數(shù)據(jù)采集器 |
| 文件頁(yè)數(shù)： | 9/18頁(yè) |
| 文件大?。?/td> | 260K |
| 代理商： | FM30C256-S |
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Two-wire Interface
The FM30C256 employs an industry standard two-
wire bus that is familiar to many users and for
convenience is described in this section.
The FM30C256 is unique since it incorporates two
logical devices in one chip. Each logical device can
be accessed individually. One is a memory device. It
has a Slave Address (Slave ID = 1010b) that
operates the same as a stand-alone memory device.
The second device is a real-time clock and tamper
detect which share a unique Slave Address (Slave
ID = 1101b).
By convention, any device that is sending data onto
the bus is the transmitter while the target device for
this data is the receiver. The device that is controlling
the bus is the master. The master is responsible for
generating the clock signal for all operations. Any
device on the bus that is being controlled is a slave.
The FM30C256 is always a slave device.
The bus protocol is controlled by transition states in
the SDA and SCL signals. There are four conditions:
Start, Stop, Data bit, and Acknowledge. Figure 4
illustrates the signal conditions that specify the four
states. Detailed timing diagrams are shown in the
electrical specifications.
Start Condition
A Start condition is indicated when the bus master
drives SDA from high to low while the SCL signal is
high. All read and write transactions begin with a
Start condition. An operation in progress can be
aborted by asserting a Start condition at any time.
Aborting an operation using the Start condition will
ready the FM30C256 for a new operation.
If the power supply drops below the specified VDD
minimum during operation, the system should issue a
Start condition prior to performing another operation.
FM30C256
Rev 2.1
Dec. 2002
Page 9 of 18
Stop Condition
A Stop condition is indicated when the bus master
drives SDA from low to high while the SCL signal
is high. All operations must end with a Stop
condition. If an operation is pending when a stop is
asserted, the operation will be aborted. The master
must have control of SDA (not a memory read) in
order to assert a Stop condition.
Data/Address Transfer
All data transfers (including addresses) take place
while the SCL signal is high. Except under the two
conditions described above, the SDA signal should
not change while SCL is high.
Acknowledge
The Acknowledge takes place after the 8
th
data bit
has been transferred in any transaction. During this
state the transmitter must release the SDA bus to
allow the receiver to drive it. The receiver drives the
SDA signal low to acknowledge receipt of the byte.
If the receiver does not drive SDA low, the
condition is a No-Acknowledge and the operation is
aborted.
The receiver might fail to acknowledge for two
distinct reasons. First is that a byte transfer fails. In
this case, the No-Acknowledge ends the current
operation so that the part can be addressed again.
This allows the last byte to be recovered in the event
of a communication error.
Second and most common, the receiver does not
send an Acknowledge to deliberately terminate an
operation. For example, during a read operation, the
FM30C256 will continue to place data onto the bus
as long as the receiver sends Acknowledges (and
clocks). When a read operation is complete and no
more data is needed, the receiver must not
acknowledge the last byte. If the receiver
acknowledges the last byte, this will cause the
FM30C256 to attempt to drive the bus on the next
clock while the master is sending a new command
such as a Stop.
Stop
(Master)
Start
(Master)
7
Data bits
(Transmitter)
6
0
Data bit
(Transmitter)
Acknowledge
(Receiver)
SCL
SDA
Figure 3. Data Transfer Protocol
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| FM30C256-STR | 功能描述:F-RAM 256K w/RTC Pwr Mon & Batt Switchover RoHS:否 存儲(chǔ)容量:512 Kbit 組織:64 K x 8 接口:SPI 工作電源電壓:2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube 制造商:Cypress Semiconductor |
| FM30C350Q (550606) | 制造商:AMETEK Technical and Industrial Products 功能描述:Air Flow Meter, Analog, 3-in - 8.0 NPSC, 70-350 SCFM Flow Range, 2% Accuracy |
| FM30C475Q (550607) | 制造商:AMETEK Technical and Industrial Products 功能描述:Air Flow Meter, Analog, 3-in - 8.0 NPSC, 95-475 SCFM Flow Range, 2% Accuracy |
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| FM30S250Q (550844) | 制造商:AMETEK Technical and Industrial Products 功能描述:Flow Meter, Digital, 4-20mA Output, NEMA 1R Enclosure, for 50-250 SCFM Flow Rate |
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