MCP4342-104E/ST Microchip Technology, MCP4342-104E/ST Datasheet - Page 58

• Manufacturer Part Number: MCP4342-104E/ST
• Description: IC DGTL POT QUAD 100K 14TSSOP
• Manufacturer: Microchip Technology
• Series: WiperLock™r

Specifications of MCP4342-104E/ST

• Package / Case: 14-TSSOP
• Taps: 129
• Resistance (ohms): 100K
• Number Of Circuits: 4
• Temperature Coefficient: 150 ppm/°C Typical
• Memory Type: Non-Volatile
• Interface: SPI Serial
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Resistance In Ohms: 100K
• Number Of Pots: Quad
• Taps Per Pot: 129
• Resistance: 100 KOhms
• Wiper Memory: Non Volatile
• Buffered Wiper: Buffered
• Digital Interface: SPI
• Operating Supply Voltage: 2.7 V to 5.5 V
• Supply Current: 450 uA
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• 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
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

MCP434X/436X
7.8
The Decrement Command is an 8-bit command. The
Decrement Command can only be issued to volatile
memory locations. The format of the command is
shown in
A Decrement Command to the volatile 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 volatile wiper location
by -1 with minimal overhead.
FIGURE 7-8:
SDI and SDO States.
DS22233A-page 58
SDI
SDO
Note:
Note 1: Only functions when writing the volatile
Decrement Wiper
A
D
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))
Table 7-2
the Decrement Wiper command. Other
addresses are invalid.
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
D
A
0
1
1
shows the valid addresses for
Decrement Command -
1
1
1
0
1 1* 1 Note 1, 2
1
X
0
IH
X
0 Note 1, 3
).
7.8.1
Typically, the CS pin starts at the inactive state (V
but may already be in the active state due to the
completion of another command.
Figure 6-4
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 wiper’s Full
Scale value (100h on 8-bit devices and 80h on 7-bit
devices). Above the wiper’s 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
7-bit
IL
Pot
or V
Setting
IH
IHH
) and is driven to the active state (V
). Typically, the CS pin will be in the inactive
3FFh
0FFh
07Fh
8-bit
101h
100h
080h
000h
SINGLE DECREMENT
Pot
081
001
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
© 2009 Microchip Technology Inc.
Properties
Figure 6-5
Wiper (W)
for additional information
IH
show
to ensure that
Decrement
Operates?
Command
IL
IL
or V
Yes
Yes
possible
No
No
or V
IHH
IHH
IH
IH
),
).
)