參數(shù)資料
型號： MCP4542T-104E/MS
廠商： Microchip Technology
文件頁數(shù)： 60/92頁
文件大?。?/td> 0K
描述： IC POT DGTL 100K SGL 8-MSOP
標準包裝： 2,500
接片： 129
電阻（歐姆）： 100k
電路數(shù)： 1
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： 8-TSSOP，8-MSOP（0.118"，3.00mm 寬）
供應(yīng)商設(shè)備封裝： 8-MSOP
包裝： 帶卷 (TR)
2008 Microchip Technology Inc.
DS22107A-page 63
MCP454X/456X/464X/466X
7.6
Increment Wiper
Normal and High Voltage
The Increment Command provide a quick and easy
method to modify the potentiometer’s wiper by +1 with
minimal overhead. The Increment Command will only
function on the volatile wiper setting memory locations
00h and 01h. The Increment Command to Non-Volatile
addresses will be ignored and will generate a A.
When executing an Increment Command, the volatile
wiper setting will be altered from n to n+1 for each
Increment Command received. The value will incre-
ment up to 100h max on 8-bit devices and 80h on 7-bit
devices. If multiple Increment Commands are received
after the value has reached 100h (or 80h), the value will
not be incremented further. Table 7-4 shows the
Increment Command versus the current volatile wiper
value.
The Increment Command will most commonly be
performed on the Volatile Wiper locations until a
desired condition is met. The value in the Volatile Wiper
register would need to be read using a Read operation
in order to write the new setting to the corresponding
Non-Volatile wiper memory using a Write operation.
The MCP4XXX is responsible for generating the A bits.
Refer to Figure 7-7 for the Increment Command
sequence. The sequence is terminated by the Stop
condition. So when executing a continuous command
string, The Increment command can be followed by any
other valid command. this means that writes do not
need to be to the same volatile memory address.
The advantage of using an Increment Command
instead of a read-modify-write series of commands is
speed and simplicity. The wiper will transition after each
Command Acknowledge when accessing the volatile
wiper registers.
TABLE 7-4:
INCREMENT OPERATION VS.
VOLATILE WIPER VALUE
7.6.1
THE HIGH VOLTAGE COMMAND
(HVC) SIGNAL
The High Voltage Command (HVC) signal is multi-
plexed with Address 0 (A0) and is used to indicate that
the command, or sequence of commands, are in the
High Voltage mode. Signals > VIHH (~8.5V) on the
HVC/A0 pin puts MCP45XX/46XX devices into 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
MCP45XX/46XXs internal VDD signal.
FIGURE 7-7:
I2C Increment Command Sequence.
Note:
Table 7-2 shows the valid addresses for
the Increment Wiper command. Other
addresses are invalid.
Note:
The command sequence can go from an
increment to any other valid command for
the specified address. Issuing an incre-
ment or decrement to a non-volatile loca-
tion will cause an error condition (A will be
generated).
Current Wiper
Setting
Wiper (W)
Properties
Increment
Command
Operates?
7-bit
Pot
8-bit
Pot
3FFh
081h
3FFh
101h
Reserved
(Full-Scale (W = A))
No
080h
100h
Full-Scale (W = A)
No
07Fh
041h
0FFh
081
W = N
040h
080h
W = N (Mid-Scale)
Yes
03Fh
001h
07Fh
001
W = N
000h
Zero Scale (W = B) Yes
Note:
There is a required delay after the HVC pin
is driven to the VIHH level to the 1st edge
of the SCL pin.
Control Byte
INCR Command (n+1)
INCR Command (n+2)
1
01
0
SA2 A1 A0 0
0
AD AD AD AD
A1 x
X A
0
AD AD AD AD
1x
X
A P (2)
0
1
2
3
432
1
Fixed
Address
Variable
Address
Device
Memory
Address
Command
Write bit
Note 1:
Increment Command (INCR) only functions when accessing the volatile wiper reg-
isters (AD3:AD0 = 0h and 1h).
2:
This command sequence does not need to terminate (using the Stop bit) and can
change to any other desired command sequence (Increment, Read, or Write).
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