MCP4131-103E/SN Microchip Technology, MCP4131-103E/SN Datasheet - Page 57

• 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

7.8
The Decrement Command is an 8-bit command. The
Decrement Command can only be issued to wiper
memory locations. The format of the command is
shown in
An Decrement Command to the wiper memory location
changes that location after a properly formatted
command (8-clocks) have been received.
Decrement commands provide a quick and easy
method to modify the value of the wiper location by -1
with minimal overhead.
FIGURE 7-8:
SDI and SDO States.
© 2008 Microchip Technology Inc.
SDI
SDO
Note:
Note 1: Only functions when writing the volatile
D
Decrement Wiper
A
Normal and High Voltage
3
1
1
2: Valid Address/Command combination.
3: Invalid Address/Command combination
4: If a Command Error (CMDERR) occurs
Figure
(DECR COMMAND (n+1))
The High Voltage Decrement Wiper
command is supported for compatability
with system that also support MCP414X/
416X/424X/426X devices.
A
D
wiper registers (AD3:AD0) 0h and 1h.
all following SDO bits will be low until the
CMDERR condition is cleared.
(the CS pin is forced to the inactive
state).
at this bit location (*), then all following
SDO bits will be driven low until the CS
pin is driven inactive (V
2
1
1
COMMAND BYTE
7-6.
A
D
1
1
1
A
D
0
1
1
Decrement Command -
1
1
1
0
1 1* 1 Note 1, 2
1
X
0
IH
X
0 Note 1, 3
).
MCP413X/415X/423X/425X
7.8.1
Typically the CS pin starts at the inactive state (V
may be already be in the active state due to the
completion of another command.
Figure 6-7
waveforms for a single Decrement. The decrement
operation requires that the CS pin be in the active state
(V
state (V
Then the 8-bit Decrement Command (Command Byte)
is clocked in on the SDI pin by the SCK pins. The SDO
pin drives the CMDERR bit on the 7th clock.
The wiper value will decrement from the wipers
Full-Scale value (100h on 8-bit devices and 80h on
7-bit devices). Above the wipers Full-Scale value
(8-bit =101h to 1FFh, 7-bit = 81h to FFh), the
decrement command is disabled. If the Wiper register
has a Zero Scale value (000h), then the wiper value will
not decrement. See
on the Decrement Command vs. the current volatile
wiper value.
The Decrement commands only require the Decrement
command byte, while the CS pin is active (V
for a single decrement.
After the wiper is decremented to the desired position,
the CS pin should be forced to V
unexpected transitions on the SCK pin do not cause
the wiper setting to change. Driving the CS pin to V
should occur as soon as possible (within device
specifications) after the last desired decrement occurs.
TABLE 7-5:
Current Wiper
3FFh
081h
080h
07Fh
041h
040h
03Fh
001h
000h
IL
7-bit
Pot
or V
Setting
IH
IHH
) and is driven to the active state (V
). Typically the CS pin will be in the inactive
3FFh
101h
100h
0FFh
080h
07Fh
000h
8-bit
SINGLE DECREMENT
081
001
Pot
through
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)
Table 7-4
Properties
Figure 6-8
Wiper (W)
for additional information
IH
DS22060B-page 57
show
to ensure that
Decrement
Command
Operates?
IL
IL
Yes
or V
Yes
possible
No
No
or V
IH
), but
IHH
IHH
IH
).
)