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X9241AMPI Datasheet(PDF) 9 Page - Intersil Corporation

Part # X9241AMPI
Description  Low Powr/2-Wire Serial Bus
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

X9241AMPI Datasheet(HTML) 9 Page - Intersil Corporation

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9
FN8164.1
September 15, 2005
Cascade Mode
The X9241A provides a mechanism for cascading the
arrays. That is, the sixty-three resistor elements of one array
may be cascaded (linked) with the resistor elements of an
adjacent array. The VL/RL of the higher order array must be
connected to the VH/RH of the lower order array (See
Figure 9).
Cascade Control Bits
The data byte, for the three-byte commands, contains 6 bits
(LSBs) for defining the wiper position plus two high order
bits, CM (Cascade Mode) and DW (Disable Wiper, normal
operation).
The state of the CM bit (bit 7 of WCR) enables or disables
cascade mode. When the CM bit of the WCR is set to “0” the
potentiometer is in the normal operation mode. When the
CM bit of the WCR is set to “1” the potentiometer is
cascaded with its adjacent higher order potentiometer. For
example; if bit 7 of WCR2 is set to “1”, pot 2 will be cascaded
to pot 3.
The state of DW enables or disables the wiper. When the
DW bit of the WCR is set to “0” the wiper is enabled; when
set to “1” the wiper is disabled. If the wiper is disabled, the
wiper terminal will be electrically isolated and float.
When operating in cascade mode VH/RH, VL/RL and the
wiper terminals of the cascaded arrays must be electrically
connected externally. All but one of the wipers must be
disabled. The user can alter the wiper position by writing
directly to the WCR or indirectly by transferring the contents
of the Data Registers to the WCR or by using the
Increment/Decrement command.
When using the Increment/Decrement command the wiper
position will automatically transition between arrays. The
current position of the wiper can be determined by reading
the WCR registers; if the DW bit is “0”, the wiper in that array
is active. If the current wiper position is to be maintained on
power-down a global XFR WCR to Data Register command
must be issued to store the position in NV memory before
power-down.
It is possible to connect three or all four potentiometers in
cascade mode. It is also possible to connect POT 3 to POT 0
as a cascade. The requirements for external connections of
VL/RL, VH/RH and the wipers are the same in these cases.
VH0/RH0
VL0/RL0
VW0/RW0
VL1/RL1
VH1/RH1
VW1/RW1
VL2/RL2
VH2/RH2
VW2/RW2
VL3/RL3
VH3/RH3
VW3/RW3
Pot 0
WCR0
Pot 1
WCR1
Pot 2
WCR2
Pot 3
WCR3
External
Connection
=
FIGURE 9. CASCADING ARRAYS
X9241A


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