MAX7347 datasheet(21/29 Pages) MAXIM

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2-Wire Interfaced Low-EMI Key Switch

and Sounder Controllers

______________________________________________________________________________________

ADDRESS

CODE (hex)

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)

0x07

7-bit value (see Table 16 for functionality)

Power-up default setting

0x07

101

Table 15. Alert Sound Register Format

SOUNDER REGISTER

READ

WRITE

DURATION

FREQUENCY

LEVEL

BUFFER

No commands are active; OR output is GPO logic 0

Read

This current command is active, none are queued (so another

command may be sent)

Read

DURATION

FREQUENCY

LEVEL

This current command is active, and another command is in

the queue

Read

DURATION

FREQUENCY

LEVEL

Perform this command, terminating and clearing any previous

active command, command queue, and autoloop; new

command is now active, and queue is now empty

Write

Add command to queue if not full; command replaces queued

command if queue is full

Write

Configure sounder output as general-purpose output, logic 0

(clear queue; sounder output active low with continuous

duration, ie, until a buffer = 0 command)

Write

Configure sounder output as general-purpose output, logic 1

(clear queue; sounder output active high with continuous

duration, ie, until a buffer = 0 command)

Write

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

Write

Autoloop is halted at the end of command 2, and output idles

as defined by command 2

Write

Table 16. Sounder Register Format

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