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參數資料
| 型號： | LA7458W |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封裝： | 10 X 10 MM, SQFP-64 |
| 文件頁數： | 9/22頁 |
| 文件大小： | 244K |
| 代理商： | LA7458W |
LA7458W
No.A0642-17/22
Serial Transfer Timing
The power on reset state continues until the second chip select signal rising edge input after the falling edge (2) of the
power on pulse (1) created internally to the IC when the power is applied. Therefore, the first data communication
operation is invalid and the data communication operations following the second chip select rising edge (3) are valid.
Notes on headphone/speaker switching and the power saving state
This IC can switch automatically between the headphone amplifier and the speaker amplifier when the headphone jack
is inserted or removed by using a headphone jack that includes a switch. When the headphone jack is inserted the
headphone amplifier operates, and the speaker amplifier is turned off. When the headphone jack is removed, the speaker
amplifier operates and the headphone amplifier is turned off.
When the speaker amplifier is operating, if the IC's pin 47, the CAMERA-H pin, goes high, the speaker amplifier will be
turned off to save power. The headphone amplifier, however, will remain operating even if the CAMERA-H pin goes
high.
When pin 46, the MUTE pin, is high, the headphone and speaker amplifiers are forcibly turned off to save power
regardless of the states of the headphone jack and CAMERA-H pin.
Smoothing is applied using an external RC circuit to prevent impulse noise at switching.
Open headphone condition: V31 ≤ 0.3V
H
L
H
L
(1)
(2)
(3)
A width of a few 100ns
The first data transfer
Power-on reset state
Serial data communication state
Power on pulse
(IC internal signal)
Power on reset
(IC internal signal)
Power supply
Chip select
H
L
H
L
270k
Ω
IB
1.7V
IB
≈ 0.05 to 0.2μA
1M
Ω
0.033
μF
10k
Ω
31
32
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