Ramsey Electronics UAM4 Manual page 24

Auto Shutdown Mode Selection
The UAM4 provides a feature that allows it to be either muted or put in a
shutdown state by applying a low to either the 'MUTE'(J4) or
'SHUTDOWN'(J3) connectors. These features can also be used in
conjunction with the temperature sensing feature of the MAX9708 amplifier.
By placing a jumper on 'H9' located just above the 'MUTE' and 'SHUTDOWN'
connectors you can have the UAM4 go into either mute or shutdown when the
over temperature sensor on the MAX9708 activates. This can be handy in
order to prevent damage to the UAM4 should the MAX9708 overheat. We
recommend you install the 'H9' jumper in either mode.
What's the difference between 'MUTE' and 'SHUTDOWN'?. If you select the
'MUTE' option the UAM4 will turn off the input amplifiers of the MAX9708, but
leave power applied to the output stages connected to your speakers. In
'SHUTDOWN' mode the power to the output stages is turned off and the
MAX9708 goes into a very low input current (0.1uA) state. In either case the
UAM4 will return to normal operation when the temperature returns to a safe
level. No matter which mode you select, it is still possible to either mute or
shutdown the UAM4 manually using the provided connectors.
AUTO SHUTDOWN MODE JUMPER CONFIGURATION
Thermal Threshold Selection / 'OVER TEMP' LED
The MAX9708 contains a temperature sensor which activates a signal when
the internal, (chip), temperature of the MAX9708 reaches the a specified level.
Note that this is not the ambient air temperature of the surrounding air but the
AUDIO GAIN JUMPER CONFIGURATION
GAIN
+22
+25
+29.5
**+36
(shutdown on over temperature)
MODE
MUTE
SHUTDOWN
**NONE
H4
1 2 3
X X
X X
X X
X X
H9
1 2
X X
X
UAM4• 24
H5
1 2 3
X X
X X
X X
X X
3
X