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參數(shù)資料
| 型號： | SAA8115HL |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 英文描述： | Digital Camera USB Interface(數(shù)字照相USB接口) |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP144 |
| 封裝： | 20 X 20 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT-486-1, LQFP-144 |
| 文件頁數(shù)： | 16/56頁 |
| 文件大?。?/td> | 177K |
| 代理商： | SAA8115HL |
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2000 Jan 27
16
Philips Semiconductors
Preliminary specification
Digital camera USB interface
SAA8115HL
8.11
Power management
USB requires the device to switch power states.
The SAA8115HL contains a power management module
since the complete camera may not consume more than
500
μ
A during the power state called SUSPEND. This
requires that even the crystal oscillator must be switched
off. The SAA8115HL is not functional except for some
logic that enables the IC to wake-up the camera. After
wake-up of the SAA8115HL first the clock to the
microcontroller is generated and thereafter an interrupt is
generated to wake-up the microcontroller. Therefore the
clock of the microcontroller is generated by the
SAA8115HL.
Thepower management module alsosetsa flagin register
SET_MODE_AND_READ(PSIE_MMU_STATUS).Aftera
reset the microcontroller should check this register via the
I
2
C-bus and find the cause of the wake-up. Different
causes may require different start-up routines.
The internal video processing core uses another supply
domain which can be switched off during SUSPEND
mode.
The PPG is switched off by setting
PPG_RESUME_MODE (0x08) and resetting PAL_VGA
(0x09).
In non CIF modes the power consumption is reduced by
resetting COMPRESSION_MODE (0x2F) and
COMPRESSION_CLOCK (0x09).
The SAA8115HL has the feature to autonomously
wake-up from SUSPEND mode, but requires
microcontroller interference before going in SUSPEND
mode (via the signal on pin SUSPREADYNOT).
Since the main oscillator of the SAA8115HL is switched off
during SUSPEND mode, precautions are needed to avoid
undefined states when the clock is switched on. This is
ensured via the pins CLOCKON and TRC. Pin CLOCKON
goes HIGH as soon as the main oscillator is switched on.
The oscillator will need some time to make a stable
48 MHz signal. However, the clock is only passed through
to other parts of the SAA8115HL when the level on
pin TRC reaches a certain threshold. The time needed to
reach the threshold can be trimmed with an external
RC circuit.
8.12
Power supply
A power supply regulator is integrated in the device. This
DC-to-DC converter transforms the USB supply voltage
(range from 4.0 to 5.5 V) into a stable 5 V supply voltage.
This power domain is switchable. The power circuit also
generates a reset signal when the external 3.3 V supply
voltage is stable and in range.
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| SAA8116ET | Digital PC-camera signal processor including microcontroller and USB interface |
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| SAA8116 | Digital PC-camera signal processor including microcontroller and USB interface |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SAA8116 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital PC-camera signal processor including microcontroller and USB interface |
| SAA8116104BE | 功能描述:數(shù)字信號處理器和控制器 - DSP, DSC PC WEB CAMERA DSP WITH USB RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時器數(shù)量:3 設備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風格:SMD/SMT |
| SAA8116104BE-S | 功能描述:數(shù)字信號處理器和控制器 - DSP, DSC PC WEB CAMERA DSP WITH USB RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時器數(shù)量:3 設備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風格:SMD/SMT |
| SAA8116104BE-T | 功能描述:數(shù)字信號處理器和控制器 - DSP, DSC PC WEB CAMERA DSP WITH USB RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時器數(shù)量:3 設備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風格:SMD/SMT |
| SAA8116ET | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital PC-camera signal processor including microcontroller and USB interface |
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