MCP4132 Microchip Technology Inc., MCP4132 Datasheet - Page 38
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MCP4132
Manufacturer Part Number
MCP4132
Description
7/8-bit Single/dual Spi Digital Pot With Volatile Memory
Manufacturer
Microchip Technology Inc.
Datasheet
1.MCP4132.pdf
(82 pages)
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MCP413X/415X/423X/425X
5.2
Each tap point (between the R
connection point for an analog switch. The opposite
side of the analog switch is connected to a common
signal which is connected to the Terminal W (Wiper)
pin.
A value in the volatile wiper register selects which
analog switch to close, connecting the W terminal to
the selected node of the resistor ladder.
The wiper can connect directly to Terminal B or to
Terminal A. A zero-scale connections, connects the
Terminal W (wiper) to Terminal B (wiper setting of
000h). A full-scale connections, connects the Terminal
W (wiper) to Terminal A (wiper setting of 100h or 80h).
In these configurations the only resistance between the
Terminal W and the other Terminal (A or B) is that of the
analog switches.
A wiper setting value greater than full scale (wiper
setting of 100h for 8-bit device or 80h for 7-bit devices)
will also be a Full Scale setting (Terminal W (wiper)
connected to Terminal A).
wiper setting map.
Equation 5-2
mine the resistance between the wiper and terminal B.
EQUATION 5-2:
TABLE 5-1:
DS22060A-page 38
7-bit Pot 8-bit Pot
3FFh
081h
080h
07Fh
041h
040h
03Fh
001h
000h
Wiper Setting
N = 0 to 256 (decimal)
N = 0 to 128 (decimal)
R
R
Wiper
WB
WB
=
=
illustrates the calculation used to deter-
3FFh
0FFh
101h
100h
080h
07Fh
000h
081
001
R
------------- -
(
R
------------- -
(
256
128
AB
AB
VOLATILE WIPER VALUE VS.
WIPER POSITION MAP
N
N
)
)
+
+
R
Reserved (Full Scale (W = A)),
Increment and Decrement
commands ignored
Full Scale (W = A),
Increment commands ignored
W = N
W = N (Mid-Scale)
W = N
Zero Scale (W = B)
Decrement command ignored
WB
R
R
W
W
Table 5-1
CALCULATION
Properties
8-bit Device
7-bit Device
S
illustrates the full
resistors) is a
A POR/BOR event will load the Volatile Wiper register
value with the default value.
default values offered. Custom POR/BOR options are
available. Contact the local Microchip Sales Office.
TABLE 5-2:
-502
-103
-503
-104
100.0 kΩ
10.0 kΩ
50.0 kΩ
5.0 kΩ
DEFAULT FACTORY
SETTINGS SELECTION
© 2007 Microchip Technology Inc.
Mid-scale
Mid-scale
Mid-scale
Mid-scale
Table 5-2
8-bit
Wiper Code
80h
80h
80h
80h
shows the
7-bit
40h
40h
40h
40h