Data Sheet
SKYTRAQ
VENUS822A GPS / GNSS Baseband Processor – Flash Version
FEATURES
Support GPS, Beidou, QZSS, SBAS
Support GPS, GLONASS, QZSS, SBAS
Ultra fast signal acquisition and TTFF speed
Perform 16 million time-frequency hypothesis
testing per second
The Venus822A is a high-performance GPS / GNSS
baseband processor intended for GPS / Beidou or
GPS / GLONASS applications. It contains all the
baseband function required for GPS / Beidou and
GPS / GLONASS signal acquisition, tracking, and
navigation solution. The Venus822A is designed to
allow easy integration of GPS / Beidou or GPS /
GLONASS into application systems.
Signal detection better than -165dBm
Reacquisition sensitivity –157dBm
Open sky hot start 1 second
Open sky cold start 29 seconds
Accuracy 2.5m CEP
Multipath detection and suppression
Jamming detection and mitigation
Supports AGPS
Tracking 15mA @ 3.3V
A dedicated massive-correlator signal parameter
search engine enables rapid search of all available
satellites and acquisition of very weak signals. An
advanced track engine allows weak signal tracking
and positioning in severe environments such as
urban canyons and under deep foliage.
A complete low-cost high-performance GPS /
Beidou or GPS / GLONASS receiver can be built
with Venus822A, a compatible GPS / Beidou or
GPS / GLONASS RF front-end, and a small number
of external components.
7mm x 7mm QFN56, RoHS compliant
Figure-1 GPS/Beidou or GPS/GLONASS Receiver based on Venus822A
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FUNCTIONAL DESCRIPTION
Figure-2 Baseband Processor Functional Diagram
The Venus822A implements all the needed function for GPS/Beidou and GPS/GLONASS signal acquisition,
tracking, decoding, and navigation solution. It is optimized for GPS/Beidou or GPS/GLONASS applications
requiring high performance. Major blocks within the chip are: GPS/GNSS signal processing engine, 32bit
RISC processor, peripheral interface, and memory.
RF Interface
The RF interface supports single-ended IF signal in sign/magnitude format and sampling frequency of
16.367667MHz with +/-0.5ppm accuracy for GPS/Beidou, and 24.552MHz with +/-0.5ppm accuracy for
GPS/GLONASS.
GPS/GNSS Signal Processing Engine
The signal-processing engine comprise of a signal parameter search engine and a track engine. Both
implement carrier frequency wipe-off, pseudorandom code removal, plus coherent and incoherent integration
required for indoors high-sensitivity signal processing.
The signal parameter search engine can be configured to search full code space and several frequencies
simultaneously, or full code space of all satellites simultaneously. Massive correlator design allows extremely
high signal acquisitions speed and high sensitivity performance.
32bit RISC
The internal 32bit RISC is a 7-stage pipelined processor. The processor handles all time-critical GPS/GNSS
related functions, management controls, and navigation solutions.
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Cache Memory
Cache memory subsystem consists of 16Kbyte I-cache, and 2Kbyte D-cache.
Battery-Backed RTC and RAM
The real-time clock circuitry and a small block of SRAM is included on-chip to retain time and the necessary
GPS/GNSS data for rapid warm start and hot-start operation.
Data RAM
The chip contains SRAM needed for stand-alone operation. The on-chip SRAM is designed for low-power and
high-speed single cycle access.
Program ROM
The chip implements program ROM on-chip.
UART
2 sets of UART is supported for Venus822A in QFN56 package.
I2C
1 set of I2C is supported for Venus822A in QFN56 package.
SPI
SPI with 2 chip-select is supported for Venus822A in QFN56 package.
Regulator
3.3V to 1.2V LDO regulator and 3.3V to 1.2V DC/DC switching regulator is implemented on-chip for powering
the RTC & Backup SRAM region (V12I_RTC) and the core logic (V12I).
PLL
The signal parameter search engine requires a high frequency clock. It is generated from the GPS reference
clock through the on-chip PLL. A divided-down PLL clock is selected to clock the 32bit RISC.
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POWER SUPPLIES
The system is partitioned into the following power supply domains:
VDDIO: Digital supply voltage for the I/O interface, supporting 3.3V I/O, 2.97V ~ 3.63V.
V12I: 1.08V ~ 1.32V, the main digital supply voltage for the core logic. It is typically derived from the on-chip
1.2V DC/DC switching regulator or can be provided from an external supply source.
V12I_PLL: 1.08V ~ 1.32V, the analog supply voltage for the internal PLL.
V12I_RTC: 1.08V ~ 1.32V, the digital supply voltage for the battery backed-up RTC and SRAM. Current
consumption ~7uA when main chip is inactive, ~1mA when main chip is active.
VDDIFINT: Digital supply voltage for RFIC interface pins (CLK / SGN / MAG), supporting 3.3V I/O or 1.8V I/O.
2.97V ~ 3.63V for 3.3V I/O. 1.62V ~ 1.98V for 1.8V I/O.
Figure-3 System Power
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PIN CONFIGURATION
Figure-4 Pin-Out QFN56 (Top-View)
Table-1 Venus822A-BD Pin-Out
Pin Name
Pin No.
Pin No.
1
MAG3
15
2
SGN3
16
3
GNDA_PLL
17
4
V12I_PLL
18
5
V12I_PLL
19
6
V12I
20
7
VDDIO
21
8
RSTN
22
9
GPIO12
23
10
GPIO13
24
11
SPI_CLK
25
12
SCL
26
13
V12O_LDO
27
14
V33I_LDO
28
Pin Name
V12I_RTC
V12I_RTC
V12I
RTCOSCI
RTCOSCO
V12I_RTC
V12O_DCDC
V33I_DCDC
SW_DCDC
GPIO1
GPIO2
GPIO3
GPIO14
SPI_MISO
Pin No.
29
30
31
32
33
34
35
36
37
38
39
40
41
42
Pin Name
SPI_MOSI
V12I
SPI_CSN0
SPI_CSN1
SDA
BOOT_SEL
VDDIO
V12I
GPIO0
RXD1
PWM
TXD1
GPIO7
GPIO16
Pin No.
43
44
45
46
47
48
49
50
51
52
53
54
55
56
Pin Name
GPIO6
GPIO10
VDDIO
NC
GND
GND
GND
GND
CLK1
SGN1
MAG1
VDDIFINT
V12I
CLK3
Center pad on bottom of the chip is digital ground of the entire chip; other GND pins are unused functions
grounded.
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SIGNAL DESCRIPTION
Table-2 Venus822A Signal Description
Signals
Type
Description
Supply
VDDIO
Power
I/O supply voltage input, 3.3V
V12I_RTC
Power
1.2V backup voltage input
V12I_PLL
Power
1.2V PLL voltage input
V33I_LDO
Power
3.3V supply input to the 1.2V LDO regulator
Voltage input range 2.5V ~ 3.6V, DC current ~30uA
V12O_LDO
Power
Regulated output of the 1.2V LDO regulator, max current 24mA.
Must not use it to drive baseband core V12I input
V33I_DCDC
Power
3.3V supply input to the 1.2V switching regulator
Voltage input range 3.0V ~ 3.6V
V12O_DCDC
Power
Regulated output of the 1.2V switching regulator, max current 100mA
SW_DCDC
Power
Switch pin, connect to inductor
V12I
Power
1.2V core voltage supply input
VDDIFINT
Power
I/O supply voltage input for RFIC interface (CLK, SGN, MAG), 1.8V or 3.3V
CPU Interface
GPIO0
Bidir
General purpose I/O #0, 3.3V I/O
Alternative function position fix status LED indicator
General purpose I/O #1, 3.3V I/O
GPIO1
Bidir
Alternative function is UART RXD2
General purpose I/O #2, 3.3V I/O
GPIO2
Bidir
Alternative function is UART TXD2
GPIO3
Bidir
General purpose I/O #3, 3.3V I/O
Alternative function is P1PPS
GPIO6
Bidir
General purpose I/O #6, 3.3V I/O
GPIO7
Bidir
General purpose I/O #7, 3.3V I/O
GPIO10
Bidir
General purpose I/O #10, 3.3V I/O
GPIO12
Bidir
General purpose I/O #12, 3.3V I/O
GPIO13
Bidir
General purpose I/O #13, 3.3V I/O
GPIO14
General
purpose I/O #14, 3.3V I/O
Bidir
GPIO16
Bidir
General purpose I/O #16, 3.3V I/O
RXD1
Input
UART input, 3.3V I/O
TXD1
SCL
Output
Bidir
SDA
Bidir
SPI_CSN1
Bidir
SPI_CSN0
Bidir
SPI_MOSI
Bidir
SPI_MISO
Bidir
SPI_CLK
Bidir
PWM
Bidir
RF Front-End
Interface
CLK1
Input
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UART output, 3.3V I/O
General purpose I/O #4, 3.3V I/O
Alternative function is I2C clock
General purpose I/O #5, 3.3V I/O
Alternative function is I2C data
General purpose I/O #22, 3.3V I/O
Alternative function is SPI master chip select #1
General purpose I/O #28, 3.3V I/O
Alternative function is SPI master chip select #0
General purpose I/O #30, 3.3V I/O
Alternative function is SPI master data out
General purpose I/O #31, 3.3V I/O
Alternative function is SPI master data in
General purpose I/O #29, 3.3V I/O
Alternative function is SPI master clock
General purpose I/O #20, 3.3V I/O
Alternative function is PWM
RFIC GPS reference clock input, 1.8V or 3.3V I/O depending on VDDIFINT
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SGN1
Input
RFIC GPS sign input, 1.8V or 3.3V I/O depending on VDDIFINT
MAG1
Input
RFIC GPS magnitude input, 1.8V or 3.3V I/O depending on VDDIFINT
CLK3
Input
SGN3
Input
MAG3
Input
RFIC Beidou or GLONASS reference clock input
1.8V or 3.3V I/O depending on VDDIFINT
RFIC Beidou or GLONASS sign input
1.8V or 3.3V I/O depending on VDDIFINT
RFIC Beidou or GLONASS magnitude input
1.8V or 3.3V I/O depending on VDDIFINT
RTC Interface
RTCOSCI
RTCOSCO
Reset
RSTN
Misc
BOOT_SEL
Input
Output
RTC crystal oscillator input
RTC crystal oscillator output
Input
Active low reset Input, 3.3V I/O
Input
Tie to VDDIO to run from internal Flash.
Tie to ground or leave NC to run from internal ROM.
When running from internal ROM, GPIO[5:4] setting at end of power on reset
determines NMEA UART transmission baud rate.
2’b01: 4800 baud
2’b00: 9600 baud
2’b10: 38400 baud
2’b11: 115200 baud
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EXTERNAL CONNECTION FOR A WORKING SYSTEM
Figure-5 Minimal System for Venus822A GPS/Beidou or GPS/GLONASS Receiver
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ABSOLUTE MAXIMUM RATINGS
Parameter
Operating Temperature
Storage Temperature
Symbol
Min.
-40
-40
Max.
+85
+150
Unit
o
C
o
C
RECOMMENDED OPERATING CONDITIONS
Parameter
Core Supply Voltage
RTC Supply Voltage
PLL Supply Voltage
Supply Voltage for I/O Interface at 3.3V
Supply Voltage for I/O Interface at 1.8V
Junction Operating Temperature
Symbol
V12I
V12I_RTC
V12I_PLL
VDDIO, VDDIFINT
VDDIFINT
Tj
Minimum
1.08
1.08
1.08
2.97
1.62
-40
Typical
1.2
1.2
1.2
3.3
1.8
25
Maximum
1.32
1.32
1.32
3.63
1.98
125
Units
Volt
Volt
Volt
Volt
Volt
o
C
Max.
0.8
VDDIO+0.3
VDDIFINT+0.3
0.4
Condition
LVTTL
LVTTL
Units
Volt
Volt
DC CHARACTERISTICS OF I/O INTERFACE AT 3.3V
Parameter
Input Low Voltage
Input High Voltage
Output Low Voltage, Iol = 4mA
Output High Voltage, Ioh = 4mA
Input Pull-Up Resistance
Input Pull-Down Resistance
Input Leakage Current
Symbol
VIL
VIH
Min.
-0.3
2.0
VOL
VOH
RPU
RPD
IIN
2.4
33
33
Typ.
41
42
Volt
Volt
K-Ohm
K-Ohm
uA
62
68
+/-10
DC CHARACTERISTICS OF I/O INTERFACE AT 1.8V
Parameter
Input Low Voltage
Symbol
VIL
Min.
-0.3
Input High Voltage
VIH
0.55*VDDIO
0.55*VDDIFINT
Output Low Voltage, Iol = 4mA
Output High Voltage, Ioh = 4mA
VOL
VOH
Input Pull-Up Resistance
Input Pull-Down Resistance
Input Leakage Current
RPU
RPD
IIN
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VDDIO-0.45
VDDIFINT-0.45
67
64
Typ.
93
92
Max.
0.35*VDDIO
0.35*VDDIFINT
VDDIO+0.3
VDDIFINT+0.3
0.45
152
170
+/-10
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Condition
LVTTL
Units
Volt
LVTTL
Volt
Volt
Volt
K-Ohm
K-Ohm
uA
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AC CHARACTERISTICS
Reset Timing
Parameter
Reset duration
Symbol
T1
Minimum
10
Typical
Maximum
Unit
CLK
CLK Timing
Parameter
Fall Time
Rise Time
Clock Pulse Width Low
Clock Pulse Width High
Clock Period
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Symbol
T2
T3
T4
T5
T6
Minimum
Typical
4.5
4.5
12
12
25
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Maximum
Unit
ns
ns
ns
ns
ns
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MECHANICAL SPECIFICATIONS
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MARKING INFORMATION
SKYTRAQ
Venus822A
1320-GK
1320: date code
GK: internal code
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RECOMMANDED REFLOW PROFILE FOR LEAD-FREE SOLDER PASTE
Follow: IPC/JEDEC J-STD-020 C
Condition:
Average ramp-up rate (217℃ to peak): 1~2℃/sec max.
Preheat:150~200C、60~180 seconds
Temperature maintained above 217℃ : 60~150 seconds
Time within 5℃ of actual peak temperature: 20 ~ 40 sec.
Peak temperature:260+0/-5℃
Ramp-down rate : 3℃/sec. max.
Time 25℃ to peak temperature : 8 minutes max.
Cycle interval:5 minutes
Slope: 1~2℃/sec max.
(217℃ to peak)
peak: 260+0/-5℃
Ramp down rate :
Max. 3℃/sec.
217℃
Preheat: 150~200℃
20~40 sec.
60 ~ 180 sec.
60 ~150sec
25℃
Time (sec)
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ORDERING INFORMATION
Part Number
Venus822A
Description
GNSS Baseband, 56 pin, QFN, Flash version
SkyTraq Technology, Inc.
4F, No.26, Minsiang Street, Hsinchu, Taiwan, 300
Phone:
+886 3 5678650
Fax:
+886 3 5678680
Email:
info@skytraq.com.tw
© 2014 SkyTraq Technology Inc. All rights reserved.
Not to be reproduced in whole or part for any purpose without written permission of SkyTraq Technology Inc (“SkyTraq”).
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omissions in these materials, nor for its use. SkyTraq reserves the right to change specification at any time without notice.
These materials are provides “as is” without warranty of any kind, either expressed or implied, relating to sale and/or use
of SkyTraq products including liability or warranties relating to fitness for a particular purpose, consequential or incidental
damages, merchantability, or infringement of any patent, copyright or other intellectual property right. SkyTraq further
does not warrant the accuracy or completeness of the information, text, graphics or other items contained within these
materials. SkyTraq shall not be liable for any special, indirect, incidental, or consequential damages, including without
limitation, lost revenues or lost profits, which may result from the use of these materials.
SkyTraq products are not intended for use in medical, life-support devices, or applications involving potential risk of death,
personal injury, or severe property damage in case of failure of the product.
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Change Log
Version 0.2, March 28, 2014
1. Updated figure-1, figure-5 RF interface signal names
Version 0.1, March 10, 2014
1. Initial release
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