MCP4461T-104E/ST Microchip Technology, MCP4461T-104E/ST Datasheet - Page 70

• Manufacturer Part Number: MCP4461T-104E/ST
• Description: IC DGTL POT 257TAPS 100K 20TSSOP
• Manufacturer: Microchip Technology

Specifications of MCP4461T-104E/ST

• Package / Case: 20-TSSOP (0.173", 4.40mm Width)
• Temperature Coefficient: 150 ppm/°C Typical
• Taps: 257
• Resistance (ohms): 100K
• Number Of Circuits: 4
• Memory Type: Non-Volatile
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Number Of Pots: Quad
• Taps Per Pot: 257
• Resistance: 100 KOhms
• Wiper Memory: Non Volatile
• Buffered Wiper: Buffered
• Digital Interface: I2C
• Operating Supply Voltage: 2.7 V to 5.5 V
• Supply Current: 600 uA
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Description/function: Quad I2C Digital POT with Nonvolatile Memory
• Mounting Style: SMD/SMT
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.7 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

MCP444X/446X
7.7
The Decrement Command provides a quick and easy
method to modify the potentiometer’s wiper by -1 with
minimal overhead. The Decrement Command will only
function on the volatile wiper setting memory locations
00h and 01h. Decrement Commands to Nonvolatile
addresses will be ignored and will generate an A bit.
When executing a Decrement Command, the volatile
wiper setting will be altered from n to n-1 for each
Decrement Command received. The value will
decrement down to 000h min. If multiple Decrement
Commands are received after the value has reached
000h, the value will not be decremented further.
Table 7-5
current volatile wiper value.
The Decrement 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
Nonvolatile wiper memory using a Write operation. The
MCP44XX is responsible for generating the A bits.
Refer to
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.
FIGURE 7-8:
DS22265A-page 70
Note:
Note:
S
Decrement Wiper
Normal and High Voltage
Note1: Decrement Command (DECR) only functions when accessing the volatile wiper
0 1 0
shows the Increment Command versus the
Figure 7-8
Fixed
Address
Table 7-5
the Decrement Wiper command. Other
addresses are invalid.
The command sequence can go from an
increment to any other valid command for
the
increment or decrement to a nonvolatile
location will cause an error condition (A
will be generated).
2:
Control Byte
specified
registers (AD3:AD0 = 00h, 01h, 06h, and 07h).
This command sequence does not need to terminate (using the Stop bit) and can
change to any other desired command sequence (INCR, Read, or Write).
1
shows the valid addresses for
for the Decrement Command
I
2
1 A1 A0 0
C Decrement Command Sequence.
Variable
Address
address.
Write bit
A
Issuing
AD AD AD AD
3
Device
Memory
Address Command
2
DECR Command (n-1)
1
an
0
1
0 X X A
The advantage of using a Decrement 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 7-5:
7.7.1
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 mode. Signals > V
HVC/A0 pin puts MCP44XX 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
MCP44XX’s internal V
Current Wiper
3FFh
081h
080h
07Fh
041h
040h
03Fh
001h
000h
7-bit
Note:
Pot
Setting
AD AD AD AD
3FFh
101h
100h
0FFh
080h
07Fh
000h
8-bit
THE HIGH VOLTAGE COMMAND
(HVC) SIGNAL
There is a required delay after the HVC pin
is driven to the V
of the SCL pin.
4
Pot
081
001
3
DECR Command (n-2)
DECREMENT OPERATION VS.
VOLATILE WIPER VALUE
Reserved
(Full-Scale (W = A))
Full-Scale (W = A)
W = N
W = N (Mid-Scale)
W = N
Zero Scale (W = B) No
2
DD
1
Properties
Wiper (W)
© 2010 Microchip Technology Inc.
signal.
1
IHH
0 X X A P
level to the 1st edge
IHH
(~8.5V) on the
No
Yes
Yes
Decrement
Operates?
Command
(2)