MCP4641-103ESLASHMF datasheet(45/92 Pages) MICROCHIP

45 / 92 page

DS22107A-page 45

MCP454X/456X/464X/466X

5.4

Shutdown

Shutdown is used to minimize the device’s current

consumption. The MCP4XXX achieves this through the

Terminal Control Register (TCON).

5.4.1

TERMINAL CONTROL REGISTER

(TCON)

The Terminal Control (TCON) register is a volatile

resistor network terminal pin (A, B, and W) to the

Resistor

Network.

This

bits

are

described

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 PxB terminal (see Figure 5-2)

• The Serial Interface is NOT disabled, and all

Serial Interface activity is executed

• Any EEPROM write cycles are completed

Alternate low power configurations may be achieved

with the RxA, RxW, and RxB bits.

FIGURE 5-2:

Resistor Network Shutdown

Configuration.

5.4.2

INTERACTION OF RxHW BIT AND

RxA, RxW, AND RxB BITS (TCON

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

by the Volatile Wiper value

• The RxA, RxB, and RxW bits return to controlling

the terminal connection state of that resistor net-

work

Note 1: The RxHW bits are identical to the RxHW

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.

2: When RxHW = “0”, the state of the TCON

ridden (ignored). When the state of the

RxHW bit returns to “1”, the TCON

controlling the terminal connection state.

In other words, the RxHW bit does not

corrupt the state of the RxA, RxW, and

RxB bits.

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