MAX7348AEP Maxim Integrated, MAX7348AEP Datasheet - Page 12

• Manufacturer Part Number: MAX7348AEP
• Description: Peripheral Drivers & Components - PCIs Low-EMI Key Switch & Sounder Controller
• Manufacturer: Maxim Integrated

2-Wire Interfaced Low-EMI Key Switch
and Sounder Controllers
Table 5. Key-Scan Power-Up Configuration
X = Don’t care.
Table 6. Sounder Power-Up Configuration
Figure 9. N Data Bytes Received
12
Sounder output is a general-purpose output, logic 0; queue is empty
Keys FIFO
Debounce
Autorepeat
Interrupt
Configuration
Ports
Key Sound
Alert Sound
FUNCTION
REGISTER
______________________________________________________________________________________
S
ACKNOWLEDGE FROM MAX7347/MAX7348/MAX7349
SLAVE ADDRESS
Empty
Ports 2–7 are enabled; debounce time is 39ms
Autorepeat is disabled
INT is a port, not an interrupt output
Shutdown mode: key sound is disabled; alert sound is
disabled; alert INT is disabled; timeout enabled; no
sound output
Ports 2–7 and INT are logic-high (high impedance)
Key-sound default is 31.25ms of 987.77Hz
Key-sound default is 250ms of 2093Hz
POWER-UP CONDITION
R/W
POWER-UP CONDITION
0
A
ACKNOWLEDGE FROM MAX7347/MAX7348/MAX7349
D7
D6
D5
COMMAND BYTE
D4
D3
D2
D1
CODE (hex)
ADDRESS
D0
D7
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0
A
ACKNOWLEDGE FROM MAX7347/MAX7348/MAX7349
D7
D6
0
D6
D7
0
1
0
0
0
1
0
1
D5
D5
0
REGISTER DATA
D6
0
1
0
0
0
1
1
0
D4
N BYTES
DATA BYTE
D4
0
D5
D3
REGISTER DATA
0
1
0
0
0
1
0
1
D2
D4
D3
0
1
0
0
0
1
1
1
0
COMMAND BYTE ADDRESS
D1
AUTOINCREMENT
D3
0
1
0
0
0
1
0
1
D2
D0
0
D2
0
1
0
0
0
1
0
0
A
D1
0
D1
P
0
1
0
0
0
1
0
1
D0
0
D0
X
0
1
0
0
1
1
1