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| 型号： | MCP4461-503E/ST |
| 厂商： | Microchip Technology |
| 文件页数： | 61/100页 |
| 文件大小： | 0K |
| 描述： | IC POT 8B QUAD NONV 50K 20TSSOP |
| 标准包装： | 74 |
| 接片： | 257 |
| 电阻（欧姆）： | 50k |
| 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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2010 Microchip Technology Inc.
DS22265A-page 63
MCP444X/446X
7.2
Data Byte
Only the Read Command and the Write Command
have Data Byte(s).
The Write command concatenates 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.
7.3
Error Condition
If the four address bits received (AD3:AD0) and the two
command
bits
received
(C1:C0)
are
a
valid
combination, the MCP44XX will Acknowledge the I2C
bus.
If the address bits and command bits are an invalid
combination, then the MCP44XX will Not Acknowledge
the I2C bus.
Once an error condition has occurred, any following
commands are ignored until the I2C bus is reset with a
Start Condition.
7.3.1
ABORTING A TRANSMISSION
A Restart or Stop condition in the expected data bit
position will abort the current command sequence and
data will not be written to the MCP44XX.
TABLE 7-3:
COMMANDS
Command Name
Writes
Value in
EEPROM
Operates on Volatile/
Nonvolatile memory
High
Voltage
(VIHH) on
HVC pin?
Impact on
WiperLock or
Write Protect
Works
when
Wiper is
“locked”?
Yes (1)
Both
—
unlocked (1)
No
—
Both
—
unlocked (1)
No
—
Volatile Only
—
unlocked (1)
No
—
Volatile Only
—
unlocked (1)
No
High Voltage Write Data
Yes
Both
Yes
unchanged
No
High Voltage Read Data
—
Both
Yes
unchanged
Yes
High Voltage Increment Wiper
—
Volatile Only
Yes
unchanged
No
High Voltage Decrement Wiper
—
Volatile Only
Yes
unchanged
No
- Enable
— (2)
Nonvolatile Only (2)
Yes
locked/
protected (2)
Yes
- Disable
— (3)
Nonvolatile Only (3)
Yes
unlocked/
unprotected (3)
Yes
Note 1:
This command will only complete, if wiper is “unlocked” (WiperLock Technology is Disabled).
2:
If the command is executed using address 02h, 03h 08h, or 09h; that corresponding wiper is locked or
if with address 0Fh, then Write Protect is enabled.
3:
If the command is executed using with address 02h, 03h 08h, or 09h; that corresponding wiper is unlocked
or if with address 0Fh, then Write Protect is disabled.
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