MAX7349AEG-T Maxim Integrated, MAX7349AEG-T Datasheet - Page 19

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

Table 12. Configuration Register Format (continued)
Table 13. Ports Register Format
Shutdown mode; key-scan and
sounder timing are disabled,
interrupts disabled, but alert input
can be read and port outputs (as
selected) can be changed
Operating mode; key scan is started,
and commands in sounder queue
are actioned
Power-up default setting
Clear port 2 low
Set port 2 high (high
impedance)
Clear port 3 low
Set port 3 high (high
impedance)
Clear port 4 low
Set port 4 high (high
impedance)
Clear port 5 low
Set port 5 high (high
impedance)
Clear port 6 low
Set port 6 high (high
impedance)
PORTS REGISTER
CONFIGURATION REGISTER
REGISTER
REGISTER
______________________________________________________________________________________
2-Wire Interfaced Low-EMI Key Switch
CODE (hex)
ADDRESS
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
CODE (hex)
ADDRESS
0x04
0x04
0x04
0x04
WRITE
WRITE
READ
READ
Write
Write
Write
Write
Write
Write
Write
Write
Write
Write
SHUTDOWN
PORT 7 PORT 6 PORT 5 PORT 4 PORT 3 PORT 2
PORT 7 PORT 6 PORT 5 PORT 4 PORT 3 PORT 2
D7
D7
X
X
X
X
X
X
X
X
X
X
0
1
0
and Sounder Controllers
D6
ENABLE
SOUND
X
X
X
X
X
X
X
X
0
1
KEY
D6
X
X
0
D5
X
X
X
X
X
X
X
X
0
1
ENABLE
SOUND
ALERT
D5
X
X
0
REGISTER DATA
REGISTER DATA
D4
X
X
X
X
X
X
X
X
0
1
ENABLE
ALERT
INT
D4
X
X
0
D3
X
X
0
1
X
X
X
X
X
X
ALERT
EVENT
INT
D3
X
X
0
D2
X
X
X
X
X
X
X
X
0
1
SOUNDER
D2
STATUS
X
X
0
PORT
PORT
INT
INT
D1
D1
X
X
X
X
X
X
X
X
X
X
X
X
0
T IM EO U T
EN A B L E
ALERT
INPUT
D0
X
X
1
D0
X
X
X
X
X
X
X
X
X
X
X
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