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| 型号： | MCP4531T-503E/ML |
| 元件分类： | 数字电位计 |
| 英文描述： | DIGITAL POTENTIOMETER, PQCC16 |
| 封装： | 4 X 4 MM, 0.90 MM HEIGHT, PLASTIC, QFN-16 |
| 文件页数： | 54/88页 |
| 文件大小： | 2310K |
| 代理商： | MCP4531T-503E/ML |
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MCP453X/455X/463X/465X
DS22096A-page 58
2008 Microchip Technology Inc.
7.5
Read Data
Normal and High Voltage
The Read Command can be issued to both the Volatile
and Non-Volatile memory locations. The format of the
command, see Figure 7-4, includes the Start condition,
I2C Control Byte (with R/W bit set to “0”), A bit,
MCP4XXX Command Byte, A bit, followed by a
Repeated Start bit, I2C Control Byte (with R/W bit set to
“1”), and the MCP4XXX transmitting the requested
Data High Byte, and A bit, the Data Low Byte, the Mas-
ter generating the A, and Stop condition.
The I2C Control Byte requires the R/W bit equal to a
logic one (R/W = 1) to generate a read sequence. The
memory location read will be the last address
contained in a valid write MCP4XXX Command Byte or
address 00h if no write operations have occurred since
the device was reset (Power-on Reset or Brown-out
Reset).
Read operations initially include the same address byte
sequence as the write sequence (shown in Figure 6-9).
This sequence is followed by another control byte
(including the Start condition and Ackowledge) with the
R/W bit equal to a logic one (R/W = 1) to indicate a
read. The MCP4XXX will then transmit the data con-
tained in the addressed register. This is followed by the
master generating an A bit in preparation for more data,
or an A bit followed by a Stop. The sequence is ended
with the master generating a Stop or Restart condition.
The internal address pointer is maintained.
7.5.1
SINGLE READ
Figure 7-4 show the waveforms for a single read.
For single reads the master sends a STOP or
RESTART condition after the data byte is sent from the
slave.
7.5.1.1
Random Read
Figure 7-5 shows the sequence for a Random Reads.
Refer to Figure 7-5 for the random byte read
sequence.
7.5.2
CONTINUOUS READS
Continuous reads allows the devices memory to be
read quickly. Continuous reads are possible to all mem-
ory locations. If a non-volatile memory write cycle is
occurring, then Read commands may only access the
volatile memory locations.
Figure 7-6 shows the sequence for three continuous
reads.
For continuous reads, instead of transmitting a Stop
or Restart condition after the data transfer, the master
reads the next data byte. The sequence ends with the
master Not Acknowledging and then sending a Stop or
Restart.
7.5.3
THE HIGH VOLTAGE COMMAND
(HVC) SIGNAL
The
High
Voltage
Command
(HVC)
signal
is
multiplexed with Address 0 (A0) and is used to indicate
that the command, or sequence of commands, are in
the High Voltage mode. High Voltage commands allow
the device’s WiperLock Technology and write protect
features to be enabled and disabled.
The HVC pin has an internal resistor connection to the
MCP4XXXs internal VDD signal.
7.5.4
IGNORING AN I2C TRANSMISSION AND
“FALLING OFF” THE BUS
The MCP4XXX expects to receive entire, valid I2C
commands and will assume any command not defined
as a valid command is due to a bus corruption and will
enter a passive high condition on the SDA signal. All
signals will be ignored until the next valid Start
condition and Control Byte are received.
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相关代理商/技术参数 |
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| MCP4532-103E/MS | 功能描述:数字电位计 IC Sngl 7B V I2C Rheo RoHS:否 制造商:Maxim Integrated 电阻:200 Ohms 温度系数:35 PPM / C 容差:25 % POT 数量:Dual 每 POT 分接头:256 弧刷存储器:Volatile 缓冲刷: 数字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作电源电压:1.7 V to 5.5 V 电源电流:27 uA 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:TQFN-16 封装:Reel |
| MCP4532-104E/MS | 功能描述:数字电位计 IC Sngl 7B V I2C Rheo RoHS:否 制造商:Maxim Integrated 电阻:200 Ohms 温度系数:35 PPM / C 容差:25 % POT 数量:Dual 每 POT 分接头:256 弧刷存储器:Volatile 缓冲刷: 数字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作电源电压:1.7 V to 5.5 V 电源电流:27 uA 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:TQFN-16 封装:Reel |
| MCP4532-104E/MS | 制造商:Microchip Technology Inc 功能描述:; LEADED PROCESS COMPATIBLE:YES; PEAK RE |
| MCP4532-502E/MS | 功能描述:数字电位计 IC Sngl 7B V I2C Rheo RoHS:否 制造商:Maxim Integrated 电阻:200 Ohms 温度系数:35 PPM / C 容差:25 % POT 数量:Dual 每 POT 分接头:256 弧刷存储器:Volatile 缓冲刷: 数字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作电源电压:1.7 V to 5.5 V 电源电流:27 uA 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:TQFN-16 封装:Reel |
| MCP4532-502E/MS | 制造商:Microchip Technology Inc 功能描述:; LEADED PROCESS COMPATIBLE:YES; PEAK RE |
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