MCP4461T-104E/ST Microchip Technology, MCP4461T-104E/ST Datasheet - Page 61

• 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

7.0
The MCP44XX’s I
this section. The I
commands are formatted.
The MCP44XX supports four basic commands. The
location accessed determines the commands that are
supported.
For the Volatile Wiper Registers, these commands are:
• Write Data
• Read Data
• Increment Data
• Decrement Data
For the Nonvolatile wiper EEPROM, general purpose
data EEPROM, and the TCON Register, these
commands are:
• Write Data
• Read Data
These commands have formats for both a single
command or continuous commands. These commands
are shown in
Each command has two operational states. The
operational state determines if the device commands
control the special features (Write Protect and
WiperLock Technology). These operational states are
referred to as:
• Normal Serial Commands
• High-Voltage Serial Commands
TABLE 7-1:
© 2010 Microchip Technology Inc.
Write Data
Read Data
Increment
(3)
Decrement
(3)
Note 1:
Operation
2:
3:
Command
DEVICE COMMANDS
“n” indicates the number of times the
command operation is to be repeated.
This command is useful to determine if a
nonvolatile memory write cycle has
completed.
High Voltage Increment and Decrement
commands on select nonvolatile memory
locations enable/disable WiperLock
Technology and the software Write
Protect feature.
Table
Single
Continuous
Single
Random
Continuous
Single
Continuous
Single
Continuous
2
Mode
I
C command formats are specified in
2
2
7-1.
C COMMANDS
C protocol does not specify how
Clocks
18n + 11
18n + 11
# of Bit
9n + 11
9n + 11
29
29
48
20
20
(1)
Both
Volatile Only
Both
Both
Both
Volatile Only
Volatile Only
Volatile Only
Volatile Only
Operates on
Nonvolatile
memory
Volatile/
(2)
Normal serial commands are those where the HVC pin
is driven to V
Commands, the HVC pin is driven to V
mode, there are four possible commands.
Additionally, there are two commands used to enable
or disable the special features (Write Protect and Wiper
Lock Technology) of the device. The commands are
special cases of the Increment and Decrement
High-Voltage Serial Command.
Table 7-2
memory location.
Table 7-3
commands and their interaction with other device
features.
7.1
The MCP44XX’s Command Byte has three fields: the
Address, the Command Operation, and 2 Data bits
(see
defined (D8).
The device memory is accessed when the Master
sends a proper Command Byte to select the desired
operation. The memory location getting accessed is
contained in the Command Byte’s AD3:AD0 bits. The
action desired is contained in the Command Byte’s
C1:C0 bits, see
desired memory location will be read, written,
Incremented (wiper setting +1) or Decremented (wiper
setting -1). The Increment and Decrement commands
are only valid on the volatile wiper registers, and in
High Voltage commands to enable/disable WiperLock
Technology and Software Write Protect.
If the Address bits and Command bits are not a valid
combination, then the MCP44XX will generate a Not
Acknowledge pulse to indicate the invalid combination.
The I
Condition to reset the MCP44XX’s I
D9 and D8 are the most significant bits for the digital
potentiometer’s wiper setting. The 8-bit devices utilize
D8 as their MSb while the 7-bit devices utilize D7 (from
the data byte) as their MSb.
FIGURE 7-1:
Figure
2
C Master device must then force a Start
Command Byte
A A
shows the supported commands for each
shows an overview of all the device
7-1). Currently only one of the data bits is
Memory Address
D
3
MCP444X/446X
MCP4XXX
IH
Figure
A
D
2
or V
COMMAND BYTE
D
A
1
Command Byte Format.
IL
7-1. C1:C0 determines if the
D
A
0
. With High-Voltage Serial
Command Operation bits
C
1
10 = Decrement
11 = Read Data
00 = Write Data
01 = Increment
C
0
D
2
9
MSbits (Data)
C module.
DS22265A-page 61
D
8
IHH
A
. In each