MCP4131-103E/SN Microchip Technology, MCP4131-103E/SN Datasheet - Page 47

• Manufacturer Part Number: MCP4131-103E/SN
• Description: IC POT DGTL SNGL 10K SPI 8SOIC
• Manufacturer: Microchip Technology

Specifications of MCP4131-103E/SN

• Taps: 129
• Resistance (ohms): 10K
• Number Of Circuits: 1
• Temperature Coefficient: 150 ppm/°C Typical
• Memory Type: Volatile
• Interface: SPI Serial
• Voltage - Supply: 1.8 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Resistance In Ohms: 10K
• End To End Resistance: 10kohm
• No. Of Steps: 129
• Resistance Tolerance: ± 20%
• Supply Voltage Range: 1.8V To 5.5V
• Control Interface: Serial, SPI
• No. Of Pots: Single
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

7.0
The MCP4XXX’s SPI command format supports 16
memory address locations and four commands. Each
command has two modes. These are:
• Normal Serial Commands
• High-Voltage Serial Commands
Normal serial commands are those where the CS pin is
driven to V
driven to V
support the MCP414X/416X/424X/426X devices. High
Voltage Serial Commands operate identically to their
corresponding Normal Serial Command. In each
mode, there are four possible commands. These
commands are shown in
The 8-bit commands
ment Wiper
see
and
and a Data Byte. The Command Byte contains two data
bits, see
Table 7-2
memory location and the corresponding values on the
SDI and SDO pins.
Table 7-3
and their interaction with other device features.
FIGURE 7-1:
© 2008 Microchip Technology Inc.
D
A
3
Write Data
Figure
Memory
Address
A
D
2
8-bit Command
Command Byte
Figure
DEVICE COMMANDS
shows an overview of all the SPI commands
A
D
shows the supported commands for each
1
IL
IHH
7-1, while 16-bit commands
. High Voltage Serial Commands, CS pin is
A
D
0
commands) contain a Command Byte,
, for compatibility with systems that also
Command
7-1.
commands) contain a Command Byte
C
1
Bits
C
0
(Increment Wiper
General SPI Command Formats.
D
Data
Bits
9
Table
D
8
7-1.
A
D
3
Memory
Address
D
A
2
(Read Data
and
Command Byte
D
A
1
Decre-
D
A
0
Command
MCP413X/415X/423X/425X
C
1
Bits
C
16-bit Command
0
D
9
D
8
7.1
The Command Byte has three fields, the Address, the
Command, and 2 Data bits, see
only one of the data bits is defined (D8). This is for the
Write command.
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.
As the Command Byte is being loaded into the device
(on the SDI pin), the device’s SDO pin is driving. The
SDO pin will output high bits for the first six bits of that
command. On the 7th bit, the SDO pin will output the
CMDERR bit state (see Section 7.3 “Error Condi-
tion”). The 8th bit state depends on the the command
selected.
TABLE 7-1:
D
7
C1:C0 Bit
States
D
6
11
00
01
10
D
5
Data
Bits
Data Byte
Command Byte
D
4
D
Command
Read Data
Write Data
Increment
Decrement
3
D
2
Table
COMMAND BIT OVERVIEW
D
1
D
0
7-1. C1:C0 determines if the
Command
Figure
Bits
C C
1 0
1 0 = DECR
1 1 = Read Data
0 0 = Write Data
0 1 = INCR
DS22060B-page 47
7-1. Currently
# of Bits
16-Bits
16-Bits
8-Bits
8-Bits