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參數(shù)資料
| 型號： | SPCA514A |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | MOSFET; Transistor Polarity:N Channel; Drain Source Voltage, Vds:60V; Continuous Drain Current, Id:75A; On-Resistance, Rds(on):0.008ohm; Rds(on) Test Voltage, Vgs:10V; Package/Case:TO-263; Leaded Process Compatible:No RoHS Compliant: No |
| 中文描述： | 數(shù)字音頻USB控制器 |
| 文件頁數(shù)： | 9/14頁 |
| 文件大小： | 111K |
| 代理商： | SPCA514A |
SPCA514A
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To enter suspend state, the firmware must program register 0X8002 bit 0. The
SPCA514 will stop the crystal oscillation if this bit is set.
From the application’s point of view, there are two possible causes to put the chip into
suspend state. The first one is the USB suspend. After the USB bus is idle for 6 ms, the
SPCA514 will issue an interrupt to inform the micro-controller. Then the micro-controller
must program the bit 0 of register 0X8002.
The other cause to enter suspend state is that when the UI is idle longer than a period
of time. This part is completely implemented by the firmware. The SPCA514 hardware has
no interrupt for this. Like the USB suspend, if the firmware decide the UI idle time is long
enough, it must program bit 0 of register 0X8002 to put the chip into suspend state.
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As stated above, before the SPCA514 returns to normal state from suspend state, it
must goes through the resume state. There are two possible causes for the SPCA514 to
enter resume state from suspend state.
(1) When bit 4 of register 0X8003 is set and the USB controller detects a bus activity on
the USB bus.
(2) When bit 5 of register 0X8003 is set and the SPCA514 detects a key status change via
GPIO pins.
All the two causes are processed by SPCA514 automatically, no firmware intervention
needed. Since the clock is stopped during suspend, it’s not possible for the micro-
controller to do anything about it. The length of internal resume period can be
programmed from 1 ms to 20 ms via bit[3:0] of register 0X8003.
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