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參數(shù)資料
| 型號(hào)： | DS1844 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 數(shù)字電位計(jì) |
| 英文描述： | Quad Digital Potentiometer(四路數(shù)字電位器) |
| 文件頁(yè)數(shù)： | 4/12頁(yè) |
| 文件大?。?/td> | 95K |
| 代理商： | DS1844 |
DS1844
042498 4/12
2. Data transfer from a slave transmitter to a master
receiver. The first byte (the command/control byte)
is transmitted by the master. The slave then returns
an acknowledge bit. Next follows a number of data
bytes transmitted by the slave to the master. The
master returns an acknowledge bit after all received
bytes other than the last byte. At the end of the last
received byte, a ‘not acknowledge’ can be returned.
The master device generates all serial clock pulses and
the START and STOP conditions. A transfer is ended
with a STOP condition or with a repeated START condi-
tion. Since a repeated START condition is also the
beginning of the next serial transfer, the bus will not be
released.
The DS1844 may operate in the following two modes:
1. Slave receiver mode: Serial data and clock are
received through SDA and SCL, respectively. After
each byte is received, an acknowledge bit is trans-
mitted. START and STOP conditions are recog-
nized as the beginning and end of a serial transfer.
Address recognition is performed by hardware after
reception of the slave (device) address and direction
bit.
2. Slave transmitter mode: The first byte is received
and handled as in the slave receiver mode. How-
ever, in this mode the direction bit will indicate that
the transfer direction is reversed. Serial data is
transmitted on SDA by the DS1844 while the serial
clock is input on SCL. START and STOP conditions
are recognized as the beginning and end of a serial
transfer.
SLAVE ADDRESS
A command/control byte is the first byte received follow-
ing the START condition from the master device. The
command/control byte consists of a four bit control
code. For the DS1844, this is set as
0101
binary for
read/write operations. The next three bits of the com-
mand/control byte are the device select bits or slave
address (A2, A1, A0). They are used by the master
device to select which of eight devices is to be
accessed. When reading or writing the DS1844, the
device select bits must match the device select pins (A2,
A1, A0). The last bit of the command/control byte (R/W)
defines the operation to be performed. When set to a
one a read operation is selected, and when set to a zero
a write operation is selected. Figure 5 shows the com-
mand/control byte structure for the DS1844.
Following the START condition, the DS1844 monitors
the SDA bus checking the device type identifier being
transmitted. Upon receiving the 0101 control code, the
appropriate device address bits, and the read/write bit,
the slave device outputs an acknowledge signal on the
SDA line.
COMMAND AND PROTOCOL
The command and protocol structure of the DS1844
allows the user to read or write the potentiometer(s).
Additionally, the 2–wire command/protocol structure of
the DS1844 will support eight different devices and a
maximum of 32 channels that can be uniquely con-
trolled. The command structures for the device are pres-
ented in Figures 6 and 7. Potentiometer data values and
control and command values are always transmitted
most significant bit (MSB) first. During communica-
tions, the receiving unit always generates the acknowl-
edge.
Reading the DS1844
As shown in Figure 6, the DS1844 provides one
read
command operation
. This operation allows the user to
read all potentiometers. Specifically, the R/W bit of the
command/control byte is set equal to a 1 for a read
operation. Communication to read the DS1844 begins
with a START condition which is issued by the master
device. The command/control byte from the master
device will follow the START condition. Once the com-
mand/control byte has been received by the DS1844,
the part will respond with an ACKNOWLEDGE. The
read/write bit of the command/control byte, as stated,
should be set equal to ‘1’ for reading the DS1844.
When the master has received the ACKNOWLEDGE
from the DS1844, the master can then begin to receive
potentiometer wiper data. The value of the potentiome-
ter–0 wiper position will be the first returned from the
DS1844, followed by potentiometer–1 and so forth.
Once the eight bits of the potentiometer–0 wiper posi-
tion have been transmitted, the master will need to issue
an ACKNOWLEDGE, unless it is the only byte to be
read, in which case the master issues a NOT
ACKNOWLEDGE. If desired the master may stop the
communication transfer at this point by issuing the
STOP condition. However, if the value of the remaining
potentiometers is needed, transfer can continue by
clocking the eight bits of the potentiometer–1 value, fol-
lowed by an ACKNOWLEDGE, and so forth. Final com-
munication transfer is terminated by issuing the STOP
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1844_05 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Quad Digital Potentiometer |
| DS1844-010 | 功能描述:數(shù)字電位計(jì) IC RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲(chǔ)器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
| DS1844-010+ | 功能描述:數(shù)字電位計(jì) IC Quad RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲(chǔ)器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
| DS1844-050 | 功能描述:數(shù)字電位計(jì) IC RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲(chǔ)器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
| DS1844-050+ | 功能描述:數(shù)字電位計(jì) IC Quad RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲(chǔ)器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
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