參數(shù)資料
型號(hào)： MCP4461-103E/ST
廠商： Microchip Technology
文件頁(yè)數(shù)： 73/100頁(yè)
文件大小： 0K
描述： IC DGTL POT 257TAPS 10K 20TSSOP
標(biāo)準(zhǔn)包裝： 74
接片： 257
電阻（歐姆）： 10k
電路數(shù)： 4
溫度系數(shù)： 標(biāo)準(zhǔn)值 150 ppm/°C
存儲(chǔ)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(yīng)商設(shè)備封裝： 20-TSSOP
包裝： 管件
MCP444X/446X
DS22265A-page 74
2010 Microchip Technology Inc.
8.2
Using Shutdown Modes
Figure 8-3 shows a possible application circuit where
the
independent
terminals
could
be
used.
Disconnecting the wiper allows the transistor input to
be taken to the Bias voltage level (disconnecting A and
or B may be desired to reduce system current).
Disconnecting Terminal A modifies the transistor input
by the RBW rheostat value to the Common B.
Disconnecting Terminal B modifies the transistor input
by the RAW rheostat value to the Common A. The
Common A and Common B connections could be
connected to VDD and VSS.
FIGURE 8-3:
Example Application Circuit
using Terminal Disconnects.
8.3
Software Reset Sequence
At times, it may become necessary to perform a
Software Reset Sequence to ensure the MCP44XX
device is in a correct and known I2C Interface state.
This technique only resets the I2C state machine.
This is useful if the MCP44XX device powers up in an
incorrect state (due to excessive bus noise, etc), or if
the Master Device is reset during communication.
Figure 8-4 shows the communication sequence to
software reset the device.
FIGURE 8-4:
Software Reset Sequence
Format.
The 1st Start bit will cause the device to reset from a
state in which it is expecting to receive data from the
Master Device. In this mode, the device is monitoring
the data bus in Receive mode and can detect the Start
bit forces an internal Reset.
The nine bits of ‘1’ are used to force a Reset of those
devices that could not be reset by the previous Start bit.
This occurs only if the MCP44XX is driving an A bit on
the I2C bus, or is in output mode (from a Read
command) and is driving a data bit of ‘0’ onto the I2C
bus. In both of these cases, the previous Start bit could
not be generated due to the MCP44XX holding the bus
low. By sending out nine ‘1’ bits, it is ensured that the
device will see a A bit (the Master Device does not drive
the I2C bus low to acknowledge the data sent by the
MCP44XX), which also forces the MCP44XX to reset.
The 2nd Start bit is sent to address the rare possibility
of an erroneous write. This could occur if the Master
Device was reset while sending a Write command to
the MCP44XX, AND then as the Master Device returns
to normal operation and issues a Start condition while
the MCP44XX is issuing an Acknowledge. In this case,
if the 2nd Start bit is not sent (and the Stop bit was sent)
the MCP44XX could initiate a write cycle.
The Stop bit terminates the current I2C bus activity. The
MCP44XX waits to detect the next Start condition.
This sequence does not effect any other I2C devices
which may be on the bus, as they should disregard this
as an invalid command.
Balance
Bias
W
B
Input
To base
of Transistor
(or Amplifier)
A
Common B
Common A
Note:
This technique is documented in AN1028.
Note:
The potential for this erroneous write
ONLY occurs if the Master Device is reset
while sending a Write command to the
MCP44XX.
S
‘1’ ‘1’ ‘1’ ‘1’ ‘1’ ‘1’ ‘1’ ‘1’
S
P
Start
bit
Nine bits of ‘1’
Start bit
Stop bit
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