MAX5456 データシートの表示（PDF） - Maxim Integrated

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MAX5456

Stereo Audio Taper Potentiometers with Pushbutton Interface

Maxim Integrated 

Stereo Audio Taper Potentiometers

with Pushbutton Interface

Shutdown, SHDN

Upon entering shutdown mode, the MAX5456/MAX5457

store the last wiper settings. The wipers move to the L_

end of the resistor string, and the H_ end of the resistor

string disconnects from the signal input. Terminating

shutdown mode restores the wipers to their previous

settings (see Figure 2). Shutdown does not affect the

state of MODE_IND.

Mute Function, MUTE

The MAX5456/MAX5457 feature a mute function. Success-

ive pulses on MUTE toggle its setting. Activating the mute

function forces both wipers to maximum attenuation (-

90dB typ). Deactivating the mute function returns the

wipers to their previous settings. Pressing VOLUP also

deactivates mute, setting the wipers to their previous

positions. MUTE is internally pulled high with a 50kΩ

resistor to VLOGIC. When both wipers are in the 31st

tap position (-62dB attenuation), further commands to

VOLDN place the wipers in the mute position (see

Table 1). VOLUP or MUTE pulses return the wipers to

position 31.

SWITCH SWITCH

CONTACT CONTACT

IS BOUNCING IS STABLE

1

SWITCH

CONTACT

IS BOUNCING

READY TO ACCEPT

ANOTHER KEYPRESS

0

VH

VL

INPUT ACCEPTED

tIPW

tWS

WAIT FOR

DEBOUNCE BY FIRST ZERO

WAITING FOR CROSSING OR

STABLE LOW, TIMEOUT, tWS

tIPW

tHPW

DEBOUNCE BY

WAITING FOR

STABLE HIGH, tHPW

(tIPW + tWS)

WIPER MOVES HERE

2dB

STEPS

Figure 5b. Wiper Transition Timing Diagram

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