MAX7349AEG Maxim Integrated, MAX7349AEG Datasheet - Page 21

• Manufacturer Part Number: MAX7349AEG
• Description: Peripheral Drivers & Components - PCIs Low-EMI Key Switch & Sounder Controller
• Manufacturer: Maxim Integrated

Table 15. Alert Sound Register Format
Table 16. Sounder Register Format
This 8-bit value is passed to sounder controller on the falling
edge of the alert input; these 7 bits define duration and
frequency only; sounder command bit D0 is ignored and
fixed internally at 1; if an alert sound is sent as 000xxxxx
(continuous), then the command is stored as 111xxxxx
(1000 ms)
Power-up default setting
No commands are active; OR output is GPO logic 0
This current command is active, none are queued (so another
command may be sent)
This current command is active, and another command is in
the queue
Perform this command, terminating and clearing any previous
active command, command queue, and autoloop; new
command is now active, and queue is now empty
Add command to queue if not full; command replaces queued
command if queue is full
Configure sounder output as general-purpose output, logic 0
(clear queue; sounder output active low with continuous
duration, ie, until a buffer = 0 command)
Configure sounder output as general-purpose output, logic 1
(clear queue; sounder output active high with continuous
duration, ie, until a buffer = 0 command)
Autoloop using the current two commands; the active
command is command 1, and the inactive command is
command 2; if no command is active, the oldest command is
reactivated as command 1, and the other command is re-
activated as command 2
Autoloop is halted at the end of command 2, and output idles
as defined by command 2
SOUNDER REGISTER
______________________________________________________________________________________
REGISTER
2-Wire Interfaced Low-EMI Key Switch
REGISTER
CODE (hex)
ADDRESS
and Sounder Controllers
WRITE
READ
Read
Read
Read
Write
Write
Write
Write
Write
Write
0x07
0x07
D7
0
X
X
0
0
0
0
DURATION
DURATION
DURATION
D7
1
7-bit value (see Table 16 for functionality)
D6
0
X
X
0
0
0
0
D6
0
D5
0
X
X
0
0
0
0
D5
1
REGISTER DATA
D4
FREQUENCY
FREQUENCY
FREQUENCY
0
X
X
0
0
0
0
REGISTER DATA
D4
1
D3
0
X
X
0
0
0
0
D3
D2
1
X
X
0
0
0
0
0
LEVEL BUFFER
LEVEL
LEVEL
D2
0
D1
0
X
X
0
1
0
1
D1
1
D0
0
0
1
0
1
0
0
1
1
D0
1
1
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