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參數(shù)資料
| 型號： | SAA1575HL |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 通信及網(wǎng)絡 |
| 英文描述： | Global Positioning System (GPS)baseband processor(通用定位系統(tǒng)基帶處理器) |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PQFP100 |
| 封裝： | 14 X 14 MM, 1.40 MM HEIGHT, PLASTIC, SOT-407-1, LQFP-100 |
| 文件頁數(shù)： | 3/56頁 |
| 文件大?。?/td> | 744K |
| 代理商： | SAA1575HL |
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1999 Jun 04
3
Philips Semiconductors
Product specification
Global Positioning System (GPS)
baseband processor
SAA1575HL
1
FEATURES
Single-chip GPS baseband solution with built-in 16-bit
microcontroller
All digital, 0.5 micron CMOS technology
Single power supply with full 3 V operation
Separate I/O power supply pins for operation with
3 or 5 V external devices
Up to 30 MHz system clock from on-chip crystal
oscillator or external clock input
2 kbytes words internal data memory for fast execution
External bus for up to 512 kbytes words data memory
and 512 kbytes words program memory
Programmable external bus timing to match external
memory speed
Chip selection outputs to reduce glue logic requirements
Reset controller for power-down detection and servicing
8 GPS channel correlators driven by firmware for
flexible GPS correlation algorithms
1 second pulse output of GPS time
2-bit digital IF GPS signal input synchronized to external
sample clock
2 fully duplex UARTs for communication with host
system processor and other devices
Real-time clock with 32.768 kHz crystal and supply for
low power timekeeping
Watchdog timer
Power-down modes under firmware control
100-pin LQFP package
50 mA supply current (typ.) when 8 GPS channels in
track (approximate).
2
GENERAL DESCRIPTION
The SAA1575HL is an integrated circuit which implements
a complete baseband function for Global Positioning
System (GPS) receivers. It combines a 16-bit Philips
80C51XA microcontroller, 8 GPS channel correlators and
related peripherals in a single IC. Users can implement a
complete GPS receiver using only the SAA1575HL, the
UAA1570HL front-end Philips IC (or similar), external
memory and a few discrete components.
The IC is aimed at low cost applications. A low power
solution was also used where possible, although this was
of secondary importance to cost. The core of the
SAA1575HL operates at 3 V.
However, for compatibility with current automotive
applications, the periphery is supplied from separate pins
and can be operated between 3 and 5 V, as required.
The function of the SAA1575HL is to read the 1 or 2-bit
sampled IF bitstream from a front-end IC and, under
control of firmware on an external ROM, calculate the full
GPS solution. The results are communicated to a host in
National Maritime Electronics Association (NMEA) format
via a standard serial port. A second serial port can be used
to provide differential GPS information to the processor for
more advance applications. In addition, various other
functions are integrated onto the IC such as a real-time
GPS clock, a power-down/reset controller, timer/counters
and a watchdog timer.
To summarise, the SAA1575HL has the following
functional units:
16-bit 80C51XA microcontroller core
2 kbytes words on-chip SRAM (16-bit words)
8 GPS channel correlators
2 UARTs
8 general purpose I/O lines
3 timer/counters
1 real-time clock
1 watchdog timer
1 power-down/reset controller.
The structure is based on a 16-bit microcontroller core
operating on all other units as memory mapped
peripherals and registers. A 16-bit data bus and a 19-bit
address bus are extended to external pins so that external
data and program memory can be accessed. On-chip
decoder circuits eliminate the need for external glue logic
for external memory access.
Each of the 8 GPS channel correlators includes a carrier
Numerically Controlled Oscillator (NCO), PN code
generator, phase rotator and low-pass filter. They
correlate the local PN sequence with the digitized input
GPS signal and generate the filtered correlation result for
the microcontroller. The firmware provided then generates
a navigation solution and provides standard GPS data
outputs to the user.
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