参数资料
| 型号： | MCP4142-503E/MF |
| 厂商： | Microchip Technology |
| 文件页数： | 42/88页 |
| 文件大小： | 0K |
| 描述： | IC DGTL SNGL 50K SPI 8DFN |
| 标准包装： | 120 |
| 系列： | WiperLock™ |
| 接片： | 129 |
| 电阻（欧姆）： | 50k |
| 电路数： | 1 |
| 温度系数： | 标准值 150 ppm/°C |
| 存储器类型： | 易失 |
| 接口： | 4 线 SPI（芯片选择） |
| 电源电压： | 1.8 V ~ 5.5 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-VDFN 裸露焊盘 |
| 供应商设备封装： | 8-DFN-EP（3x3） |
| 包装： | 管件 |
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2008 Microchip Technology Inc.
DS22059B-page 47
MCP414X/416X/424X/426X
7.2
Data Byte
Only the Read Command and the Write Command use
the Data Byte, see Figure 7-1. These commands
concatenate the 8-bits of the Data Byte with the one
data bit (D8) contained in the Command Byte to form
9-bits of data (D8:D0). The Command Byte format
supports up to 9-bits of data so that the 8-bit resistor
network can be set to Full Scale (100h or greater). This
allows wiper connections to Terminal A and to
Terminal B.
The D9 bit is currently unused, and corresponds to the
position on the SDO data of the CMDERR bit.
7.3
Error Condition
The CMDERR bit indicates if the four address bits
received (AD3:AD0) and the two command bits
received (C1:C0) are a valid combination (see
Table 4-1). The CMDERR bit is high if the combination
is valid and low if the combination is invalid.
The command error bit will also be low if a write to a
Non-Volatile Address has been specified and another
SPI command occurs before the CS pin is driven
inactive (VIH).
SPI commands that do not have a multiple of 8 clocks
are ignored.
Once an error condition has occurred, any following
commands are ignored. All following SDO bits will be
low until the CMDERR condition is cleared by forcing
the CS pin to the inactive state (VIH).
7.3.1
ABORTING A TRANSMISSION
All SPI transmissions must have the correct number of
SCK pulses to be executed. The command is not
executed until the complete number of clocks have
been received. Some commands also require the CS
pin to be forced inactive (VIH). If the CS pin is forced to
the inactive state (VIH) the serial interface is reset.
Partial commands are not executed.
SPI is more susceptible to noise than other bus
protocols. The most likely case is that this noise
corrupts the value of the data being clocked into the
MCP4XXX or the SCK pin is injected with extra clock
pulses. This may cause data to be corrupted in the
device, or a command error to occur, since the address
and command bits were not a valid combination. The
extra SCK pulse will also cause the SPI data (SDI) and
clock (SCK) to be out of sync. Forcing the CS pin to the
inactive state (VIH) resets the serial interface. The SPI
interface will ignore activity on the SDI and SCK pins
until the CS pin transition to the active state is detected
(VIH to VIL or VIH to VIHH).
Note 1:
When data is not being received by the
MCP4XXX, It is recommended that the
CS pin be forced to the inactive level (VIL)
2:
It is also recommended that long continu-
ous command strings should be broken
down into single commands or shorter
continuous
command
strings.
This
reduces the probability of noise on the
SCK pin corrupting the desired SPI
commands.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MCP4142-503I/MF | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:7/8-Bit Single/Dual SPI Digital POT with Non-Volatile Memory |
| MCP4142-503I/ML | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:7/8-Bit Single/Dual SPI Digital POT with Non-Volatile Memory |
| MCP4142-503I/MS | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:7/8-Bit Single/Dual SPI Digital POT with Non-Volatile Memory |
| MCP4142-503I/P | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:7/8-Bit Single/Dual SPI Digital POT with Non-Volatile Memory |
| MCP4142-503I/SL | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:7/8-Bit Single/Dual SPI Digital POT with Non-Volatile Memory |
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