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參數(shù)資料
| 型號： | 935260577557 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | TELECOM, CORDLESS, BASEBAND CIRCUIT, PQFP100 |
| 封裝： | PLASTIC, SOT-407, LQFP-100 |
| 文件頁數(shù)： | 19/59頁 |
| 文件大?。?/td> | 781K |
| 代理商： | 935260577557 |
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1999 Jun 04
26
Philips Semiconductors
Product specication
Global Positioning System (GPS)
baseband processor
SAA1575HL
7.9.2
RTC CLOCK (XTAL3)
If the on-chip real-time clock is required (as with the
standard Philips firmware), a low frequency clock signal is
required to run the clock. The SAA1575HL is designed so
that a standard 32.768 kHz watch crystal can be used for
this purpose. Since this is much slower than the system
clock, a much lower power is required to run just the
real-time clock, allowing it to be powered from a
low-capacity battery when the main power supply fails.
As with the system clock, there is an on-chip oscillator so
that only a few passive external components are required.
These would be an external crystal accompanied by two
capacitors connected to ground, a series resistor
(optional) and a shunt resistor to ensure start-up under all
conditions.
Optimum values of C and RP will depend on the crystal
used. However, typical values would be C = 22 pF and
RP =1M.
7.9.3
REFERENCE CLOCK (RCLK)
The reference clock input, RCLK, is used as the source for
the sampling of the IF input signal. A divided-down version
of RCLK is output on the sample clock pin, SCLK, for use
by the front-end IC.
The division ratio of RCLK/SCLK is programmable in
firmware. In the standard Philips firmware this ratio is set
to 3.
Fig.14 RTC clock oscillator circuit.
handbook, halfpage
MHB473
OSCILLATOR
XTAL4
XTAL3
XTAL
C
RP
(optional)
RTC clock
off-chip
on-chip
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