MCP4531 Microchip Technology Inc., MCP4531 Datasheet - Page 45

• Manufacturer Part Number: MCP4531
• Description: 7/8-bit Single/dual I 2 C Digital Pot With Non-volatile Memory
• Manufacturer: Microchip Technology Inc.

5.4
Shutdown is used to minimize the device’s current
consumption. The MCP4XXX achieves this through the
Terminal Control Register
5.4.1
The Terminal Control (TCON) register is a volatile
register used to configure the connection of each
resistor network terminal pin (A, B, and W) to the
Resistor
Register
When the RxHW bit is a “0”, the selected resistor net-
work is forced into the following state:
• The PxA terminal is disconnected
• The PxW terminal is simultaneously connected to
• The Serial Interface is NOT disabled, and all
• Any EEPROM write cycles are completed
Alternate low power configurations may be achieved
with the RxA, RxW, and RxB bits.
FIGURE 5-2:
Configuration.
© 2008 Microchip Technology Inc.
the PxB terminal (see
Serial Interface activity is executed
Note 1: The RxHW bits are identical to the RxHW
2: When RxHW = “0”, the state of the TCON
Shutdown
4-2.
Network.
TERMINAL CONTROL REGISTER
(TCON)
bits of the MCP41XX/42XX devices. The
MCP42XX devices also have a SHDN
pin which forces the resistor network into
the same state as that resistor networks
RxHW bit.
register RxA, RxW, and RxB bits is over-
ridden (ignored). When the state of the
RxHW bit returns to “1”, the TCON
register RxA, RxW, and RxB bits return to
controlling the terminal connection state.
In other words, the RxHW bit does not
corrupt the state of the RxA, RxW, and
RxB bits.
A
B
This
Resistor Network Shutdown
Figure
(TCON).
bits
5-2)
are
W
described
MCP454X/456X/464X/466X
in
5.4.2
Using the TCON bits allows each resistor network (Pot
0 and Pot 1) to be individually “shutdown”.
The state of the RxHW bit does NOT corrupt the other
bit values in the TCON register nor the value of the
Volatile Wiper Registers. When the Shutdown mode is
exited (RxHW changes state from “0” to “1”):
• The device returns to the Wiper setting specified
• The RxA, RxB, and RxW bits return to controlling
by the Volatile Wiper value
the terminal connection state of that resistor net-
work
INTERACTION OF RxHW BIT AND
RxA, RxW, AND RxB BITS (TCON
REGISTER)
DS22107A-page 45