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| 型号： | MCP4461-502E/ST |
| 厂商： | Microchip Technology |
| 文件页数： | 62/100页 |
| 文件大小： | 0K |
| 描述： | IC POT 8BIT QUAD NONV 5K 20TSSOP |
| 标准包装： | 74 |
| 接片： | 257 |
| 电阻（欧姆）： | 5k |
| 电路数： | 4 |
| 温度系数： | 标准值 150 ppm/°C |
| 存储器类型： | 非易失 |
| 接口： | I²C（设备位址） |
| 电源电压： | 2.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 20-TSSOP |
| 包装： | 管件 |
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MCP444X/446X
DS22265A-page 64
2010 Microchip Technology Inc.
7.4
Write Data
Normal and High Voltage
The Write Command can be issued to both the Volatile
and Nonvolatile memory locations. The format of the
Byte, an A bit, the MCP44XX Command Byte, an A bit,
the MCP44XX Data Byte, an A bit, and a Stop (or
Restart) condition. The MCP44XX generates the A / A
bits.
A Write command to a Volatile memory location
changes that location after a properly formatted Write
Command and the A / A clock have been received.
A Write command to a Nonvolatile memory location will
only start a write cycle after a properly formatted Write
Command have been received and the Stop condition
has occurred.
7.4.1
SINGLE WRITE TO VOLATILE
MEMORY
For volatile memory locations, data is written to the
MCP44XX after every byte transfer (during the
Acknowledge). If a Stop or Restart condition is
generated during a data transfer (before the A), the
data will not be written to the MCP44XX. After the A bit,
the master can initiate the next sequence with a Stop or
Restart condition.
Refer to Figure 7-2 for the byte write sequence.
7.4.2
SINGLE WRITE TO NONVOLATILE
MEMORY
The sequence to write to a single nonvolatile memory
location is the same as a single write to volatile memory
with the exception that the EEPROM write cycle (twc) is
started after a properly formatted command, including
the Stop bit, is received. After the Stop condition
occurs, the serial interface may immediately be
re-enabled by initiating a Start condition.
During an EEPROM write cycle, access to the volatile
memory (addresses 00h, 01h, 04h, 05h, 06h, 07h, and
0Ah) is allowed when using the appropriate command
sequence. Commands that address nonvolatile
memory are ignored until the EEPROM write cycle (twc)
completes. This allows the Host Controller to operate
on the Volatile Wiper registers, the TCON register, and
to Read the Status Register. The EEWA bit in the
Status register indicates the status of an EEPROM
Write Cycle.
Once a write command to a Nonvolatile memory
location has been received, no other commands should
be received before the Stop condition occurs.
Figure 7-2 shows the waveform for a single write.
7.4.3
CONTINUOUS WRITES TO
VOLATILE MEMORY
A continuous write mode of operation is possible when
writing to the volatile memory registers (address 00h,
01h, 04h, 06h, 07h, and 0Ah). This continuous write
mode allows writes without a Stop or Restart condition
or repeated transmissions of the I2C Control Byte.
Figure 7-3 shows the sequence for three continuous
writes. The writes do not need to be to the same volatile
memory address. The sequence ends with the master
sending a STOP or RESTART condition.
7.4.4
CONTINUOUS WRITES TO
NONVOLATILE MEMORY
If a continuous write is attempted on Nonvolatile
memory, the missing Stop condition will cause the
command to be an error condition (A). A Start bit is
required to reset the command state machine.
7.4.5
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 operational state. 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
MCP44XXs internal VDD signal.
Note:
Writes to certain memory locations will be
dependant on the state of the WiperLock
Technology bits and the Write Protect bit.
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