參數(shù)資料
型號： SAA8116ET
廠商： NXP SEMICONDUCTORS
元件分類： 消費家電
英文描述： Digital PC-camera signal processor including microcontroller and USB interface
中文描述： SPECIALTY CONSUMER CIRCUIT, PBGA112
封裝： 7 X 7 MM, 0.80 MM HEIGHT, PLASTIC, MO-195, SOT-630-1, TFBGA-112
文件頁數(shù)： 19/60頁
文件大?。?/td> 237K
代理商： SAA8116ET
2001 May 04
19
Philips Semiconductors
Product specification
Digital PC-camera signal processor including
microcontroller and USB interface
SAA8116
Table 6
ADC clock frequencies and sample frequencies
Note
1.
Not supported.
Power management
USB requires the device to switch power states. The
SAA8116 contains a power management module since
the complete camera may not consume more than 500
μ
A
during the SUSPEND power state. This requires that even
thecrystaloscillatormustbeswitchedoff.The SAA8116is
not functional except for some logic that enables the IC to
wake up the camera.
The SAA8116 incorporates remote wake-up (on two pins)
to signal the host to resume operation when triggered.
Thepower management module alsosetsa flagin register
POWERMGT_STATUS. After a reset, the microcontroller
should check this register and find the cause of the
wake-up. Different causes may require different start-up
routines.
Miscellaneous functions
Some additional functions are integrated in the SAA8116
to provide a cost effective application.
S
ERIAL INTERFACE WITH THE PRE
-
PROCESSOR
With CCD image sensors, the pre-processor (e.g.
TDA8787A) is controlled over a 3-wire serial interface. It is
adaptedtoshiftout16 bitsettings.Forflexibility,theoutput
pins can also be programmed as three general output pins
using register PIN_CONFIG_1.
C
LOCK
PLL
The SAA8116 runs on an internal master clock of 48 MHz,
which can be derived from either a 48 or 12 MHz
fundamental crystal. When it is derived from a 12 MHz
fundamental crystal, an internal clock PLL transfers the
12 MHz to 48 MHz, with a 50% duty cycle.
A 48 MHz third overtone crystal can also be used but
requires an external LC circuit.
R
ING OSCILLATOR
To generate several time constants for power state
switching, a digital counter running on an integrated ring
oscillator is incorporated, thus saving pins and commonly
used external RC components.
P
OWER
-O
N
R
ESET
(POR)
A POR function is integrated to generate a reset during the
start-up of the power supply and during a power fail. It
includes a fixed threshold detector (2.6 V) and a reset
generator. The reset output has a built-in delay with a
duration determined by the ring oscillator (around 100 ms).
An external POR can be used.
M
ODE CONTROL
Twopinsarededicatedto controltheoperationalmodesof
the SAA8116 (see Table 7).
Table 7
Mode control
CLOCK
(MHz)
DIVIDING
NUMBER
SAMPLE
FREQUENCY
(kHz)
ADC CLOCK
(MHz)
8.1920
1
2
4
8
1
2
4
8
1
2
4
8
32
16
8
4.096
2.048
1.042
note 1
5.6448
2.8224
1.4112
0.7056
6.144
3.072
1.536
0.768
note 1
44.1
22.05
11.025
5.5125
48
24
12
6
11.2896
12.2880
XS
PS
MODE
0
0
application mode (48 MHz crystal;
internal POR)
application mode (48 MHz crystal;
external POR)
application mode (12 MHz crystal;
internal POR)
application mode (12 MHz crystal;
external POR)
0
1
1
0
1
1
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