參數(shù)資料
型號： MCP4441T-503E/ST
廠商： Microchip Technology
文件頁數(shù)： 70/100頁
文件大小： 0K
描述： IC DGTL POT 129TAPS QUAD 20TSSOP
標準包裝： 2,500
接片： 129
電阻（歐姆）： 50k
電路數(shù)： 4
溫度系數(shù)： 標準值 150 ppm/°C
存儲器類型： 非易失
接口： I²C（設(shè)備位址）
電源電壓： 2.7 V ~ 5.5 V
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： 20-TSSOP（0.173"，4.40mm 寬）
供應商設(shè)備封裝： 20-TSSOP
包裝： 帶卷 (TR)
2010 Microchip Technology Inc.
DS22265A-page 71
MCP444X/446X
7.8
Modify Write Protect or WiperLock
Technology (High Voltage)
Enable and Disable
These commands are special cases of the High
Voltage Decrement Wiper and the High Voltage
commands to the nonvolatile
memory locations 02h, 03h, 08h, 09h, and 0Fh. This
command is used to enable or disable either the
software Write Protect, wiper 0 WiperLock Technology,
wiper 1 WiperLock Technology, wiper 2 WiperLock
Technology, or wiper 3 WiperLock Technology. Table 7-
6 shows the memory addresses, the High Voltage
command and the result of those commands on the
nonvolatile WP, WL0, or WL1 bits.
7.8.1
SINGLE MODIFY (ENABLE OR
DISABLE) WRITE PROTECT OR
WIPERLOCK TECHNOLOGY (HIGH
VOLTAGE)
Figure 7-9 (Disable) and Figure 7-10 (Enable) show
the formats for a single Modify Write Protect or
Wiper-Lock Technology command.
A Modify Write Protect or WiperLock Technology
Command will only start an EEPROM write cycle (twc)
after a properly formatted Command has been
received and the Stop condition occurs.
During an EEPROM write cycle, only serial commands
to Volatile memory (addresses 00h, 01h, 04h, and 05h)
are accepted. All other serial commands are ignored
until the EEPROM write cycle (twc) completes. This
allows the Host Controller to operate on the Volatile
Wiper registers and the TCON register, and to Read
the Status Register. The EEWA bit in the Status register
indicates the status of an EEPROM Write Cycle.
TABLE 7-6:
ADDRESS MAP TO MODIFY WRITE PROTECT AND WIPERLOCK TECHNOLOGY
Memory
Address
Commands and Results
High Voltage Decrement Wiper
High Voltage Increment Wiper
00h
Wiper 0 register is decremented
Wiper 0 register is incremented
01h
Wiper 1 register is decremented
Wiper 1 register is incremented
02h
WL0 is enabled
WL0 is disabled
03h
WL1 is enabled
WL1 is disabled
04h (1)
TCON0 register not changed
05h (1)
STATUS register not changed
06h
Wiper 2 register is decremented
Wiper 2 register is incremented
07h
Wiper 3 register is decremented
Wiper 3 register is incremented
08h
WL2 is enabled
WL2 is disabled
09h
WL3 is enabled
WL3 is disabled
0Ah (1)
TCON1 register not changed
0Bh - 0Eh (1)
Reserved
0Fh
WP is enabled
WP is disabled
Note 1:
Reserved addresses:
Increment or Decrement commands are invalid for these addresses.
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