MCP433X datasheet(45/88 Pages) MICROCHIP

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 2010 Microchip Technology Inc.

DS22242A-page 45

MCP433X/435X

5.3

Shutdown

Shutdown is used to minimize the device’s current

consumption. The MCP43XX has one method to

achieve this:

• Terminal Control Register (TCON)

This is different from the MCP42XXX devices in that the

Hardware Shutdown pin (SHDN) has been replaced by

a RESET pin. The Hardware Shutdown pin function is

still available via software commands to the TCON

5.3.1

TERMINAL CONTROL REGISTER

(TCON)

The Terminal Control (TCON) register is a volatile

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

Resistor Network. These registers are shown in

The RxHW bit forces the selected resistor network into

the same state as the MCP42X1’s SHDN pin. Alternate

low-power configurations may be achieved with the

RxA, RxW and RxB bits.

When the RxHW bit is “0”:

• The P0A, P1A, P2A and P3A terminals are

disconnected

• The P0W, P1W, P2W and P3W terminals are

simultaneously connect to the P0B, P1B, P2B and

P3B terminals, respectively (see Figure 5-2)

The RxHW bit does NOT corrupt the values in the

Volatile Wiper Registers nor the TCON register. When

the Shutdown mode is exited (RxHW bit = 1):

• The device returns to the Wiper setting specified

by the Volatile Wiper value

• The TCON register bits return to controlling the

terminal connection state

FIGURE 5-2:

Resistor Network Shutdown

State (RxHW =

0).

Note:

When the RxHW bit forces the resistor

network into the hardware SHDN state,

the state of the TCON0 or TCON1

overridden (ignored). When the state of

the RxHW bit no longer forces the resistor

network into the hardware SHDN state,

the TCON0 or TCON1 register’s 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.

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