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Revision 1.21 Page of 8 April. 2014 DSPC01 Digital Compass Pressure Sensor Module V1.20 Features:
Applications
Calibrated digital sensor I2C data interface Pressure resolution: 0.01hpa Pressure accuracy: ±2hpa Pressure range: 300~1100hpa Altitude resolution: 1m Altitude range: -689~8948m Compass resolution: 1° Compass accuracy:±3° Compass range: 0°~359° Temperature resolution: 0.1°C Temperature accuracy: ±1°C Temperature range: -40°C ~+85°C Standby current ≤ 2uA Supply voltage: 2.4~3.6V GPS navigation Sports watch Digital Compass Sports vehicle Mobile altimeter Barometer systems Weather station
DESCRIPTION
DSPC01 is a type of digital sensor module which consists of a high resolution piezo-resistive pressure sensor, a compass sensor and a MCU. By one module DSPC01 can measure pressure, temperature and compass parameters. The output data are digitally calibrated and users can easily access related data through I2C interface, which shortens the development time and simplifies the work of designers greatly. For pressure measurement DSPC01 module provides three modes: Altitude mode, Pressure mode and Pattern mode. The pattern mode is used for forecasting the variation of weather and users can know the weather conditions through the weather patterns (sunny, cloudy and rainy) displayed on the screen. This function is similar to what weather station offers but more convenient and concise. DSPC01 modules work at 2.4~3.6V. It consumes about 2uA in standby mode and 1.5mA in normal work mode. Because of its compact size and extra low power consumption, it is very suitable for portable products.
Revision 1.21 Page of 8 April. 2014 PIN FUNCTIONS Figure 1: DSPC01 Pin Layout PIN DIP Function Description
1 GND Ground Ground (0V)
2 SDA Input/output I2C serial port, data pin
3 SCK Input I2C serial port, clock pin
4 VCC Power Power supply
5 GND Ground Ground (0V)
6 GND Ground Ground (0V)
7 GND Ground Ground (0V)
Table 1 DSPC01 Pin functions ELECTRICAL SPECIFICATIONS Symbol Parameter (condition) Min. Typ. Max. Units VCC Supply V oltage 2.4 3 3.6 V Temp Operating temperature range -40 25 85 °C IDD Sleep mode Normal working mode 1.5 uA mA Rp Pressure range 300 1100 hpa Pa Absolute pressure accuracy ±1.5 hpa Par Absolute pressure resolution 0.01 hpa Pr Relative pressure accuracy ±0.12 hpa Prr Relative pressure resolution 0.01 hpa Ra Altitude range -698 8943 m Ha Absolute altitude accuracy ±12 m Har Absolute altitude resolution 1 m Hr Relative altitude accuracy ±1 m
Revision 1.21 Page of 8 April. 2014 Hrr Relative altitude resolution 1 m Rc Compass range 0 359 ° Ca Compass accuracy ±3 ° Cr Compass resolution 1 ° Rt Temperature range -40 85 °C Tr Temperature resolution 0.1 °C Ta Temperature accuracy @ 25°C @ 0 … + 6 5 ° C ±0.5 Table 2 DSPC01 Electrical Specifications ABSOLUTE MAXIMUM RATINGS Symbol Parameter Min. Max. Units VCC Supply V oltage -0.3 4.0 V VI Input voltage -0.3 VCC+0.3 V VO Output voltage -0.3 VCC+0.3 V TST Storage temperature -40 85 °C Table 3 DSPC01 Maximum Ratings WORK MODE 1. Initialization and Power-saving mode Initialization: It starts as soon as being powered on. After 200ms delay, the module will enter into sleep mode. Wake-up mode: The host sends command (0x70) to DSPC01 module. After 1s delay, the sensor module then can accept other commands. Sleep mode: The DSPC01 module will enter into sleep mode after getting command (0x71) from the host. 2. Altitude Mode The host sends command (0xA0) to DSPC01 and the module will return 3 bytes of Hex data representing altitude value. The MSB of first byte is symbol bit so the altitude might be a negative number. The remaining 23 bits will be divided by 10 and the result is the actual altitude in meters. E.g. 0x80 00 10 = 1 00000000000000000010000B -1.6m 0x00 07 D1 =0 00000000000011111010001B 200.1m
Revision 1.21 Page of 8 April. 2014 Command Function Returned Value Explanation A0 Read altitude value 0x XX XX XX Signed value; one decimal fraction Table 4 DSPC01 Altitude Mode 3. Pressure Mode The host sends command (0xB0) to DSPC01 and the module will return 3 bytes of Hex data representing pressure value (300hpa ~1100hpa) which should be transferred to decimal value. Command Function Returned Value Explanation B0 Read pressure value 0x XX XX XX No decimal fraction Table 5 DSPC01 Pressure Mode 4. Patten Mode The host sends command (0xB3) to DSPC01 and the module will return one bytes of data representing the weather trend. Command Function Returned Value Explanation B3 Read pressure value 0x XX 1 Sunny; 2 Cloudy; 3 Rainy Table 6 DSPC01 Patten Mode 5. Compass Mode The host sends command (0xC0) to DSPC01 and the module will return two bytes of unsigned data (0~359). In order to get the accurate direction, the compass should be calibrated for the first use. After sending command (0Xe0) users should rotate the DSPC01 module horizontally for at least 2 times and each circle should last at least 3 seconds. The DSPC01 module will quit the calibration mode after 10 seconds. Command Function Returned Value Explanation C0 Read compass value 0x XX XX Unsigned value, no fraction E0 Calibration mode --- Calibrating the compass Table 7 DSPC01 Compass Mode 6. Temperature Mode The host sends command (0x80) to DSPC01 and the module will return 2 bytes of Hex data. The MSB of first byte is symbol bit so the temperature might be negative. The remaining 15
Revision 1.21 Page of 8 April. 2014 bits will be divided by 10 and the result is the actual temperature in Celsius degree. E.g. 0x80 12 = 1 000000000010010B -1.8 °C 0x01 17 = 0 000000100010111B 27.9 °C Command Function Returned Value Explanation
80 Read temp value 0x XX XX Signed value; one decimal fraction
Table 8 DSPC01 Temperature Mode 7. Communication DSPC01 communicates with the host through I2C interface so three wires are needed for normal operation. The address for “write operation” is 0x20 and for “read operation” it is 0x21. Because the pull-up resisters are installed on the DSPC01 module, the host doesn’t need any pull-up for I2C interface. TECHNICAL NOTES 1. The timing for “Start”, “Stop”, “ACK”, “NACK”, “write” and “read” is same as I2C 2. The timing for write is : start + write 0x20 +ACK + write command + ACK + stop 3. The timing for read is : start + write 0x21 + ACK + read data1 + ACK + read data2+ ACK +…read datax+ NACK + stop 4. For compass calibration, it will last for around 9.5s, during this period, it won’t respond for any command. 5. For any command, if you don’t get the ACK from the module, you must add the timeout (0.1s) in your program. And resend this command again till you got the right ACK. 6. When switching the write command to read command you need to wait 150ms and 10ms for switching from read to write. 7. When you want the module to be in power save mode, you need to send the write command (0x71) 8. When wake up from sleep mode, you need to send write command (0x70), and also any commands except 0x71 will wake up the module. 9. For the frequency of I2C, it can’t be higher than 10 KHz. For old version of sensor, the highest frequency can’t exceed 5 KHz so users can try to start at 5 KHz or lower. 10. For the power supply it is limited to ( 2.4 – 3.6V) 11. For data reading, the highest byte is first and MSB in each byte. For example Start + 0x20 + ack + 0xa0 + ack + stop Delay 200ms Start + 0x21 + ack + 0x00 + ack + 0x03 + ack + 0x48+ NACK + stop The altitude got is 0x000348, and it is 84.0m
Revision 1.21 Page of 8 April. 2014 12. For temperature and altitude, the highest bit will show it is positive or negative. When the highest bit is 1, the value is negative. The other bit show the actual value. For example, for altitude, when the data got is 0x80111c, the actual altitude is : -438.0m. Wake up command: Start + 0x20 + ACK_from _module + 0x70 + ACK_from_module + stop Delay 1s Sleep command Start + 0x20 + ACK_from _module + 0x71 + ACK_from_module + stop Delay 100ms Read altitude command Start + 0x20 + ACK_from _module + 0xa0 + ACK_from_module + stop Delay 200ms Start + 0x21 + ACK_from _module + Data1 + ACK_from_ master + Data2 + ACK_ from_master + Data3 + NACK_from_master + Stop Delay 10ms Read pressure command Start + 0x20 + ACK_from _module + 0xb0 + ACK_from_module + stop Delay 200ms Start + 0x21 + ACK_from _module + Data1 + ACK_from_ master + Data2 + ACK_ from_master + Data3 + NACK_from_master + Stop Delay 10ms Read weather forecast command Start + 0x20 + ACK_from _module + 0xb3 + ACK_from_module + stop Delay 200ms Start + 0x21 + ACK_from _module + Data1 + NACK_from_master + Stop Delay 10ms Read Compass command Start + 0x20 + ACK_from _module + 0xc0 + ACK_from_module + stop Delay 200ms Start + 0x21 + ACK_from _module + Data1 + ACK_from_master + Data2 + NACK_from_master + Stop Delay 10ms Read Temperature command Start + 0x20 + ACK_from _module + 0x80 + ACK_from_module + stop Delay 200ms Start + 0x21 + ACK_from _module + Data1 + ACK_from_master + Data2 + NACK_from_master + Stop Delay 10ms
Revision 1.21 Page of 8 April. 2014 Start Compass calibration command Start + 0x20 + ACK_from _module + 0xE0 + ACK_from_module + stop MECHANICAL DATA Figure 2: DSPC01 Dimensions
Revision 1.21 Page of 8 April. 2014 APPLIATION NOTES 1. The heat from mother board might affect th e accuracy of temperature when measuring environment temperature so DSPC01 module should be kept away from power or PA ( Specially in mobile phone) which dissipate heat greatly. 2. DSPC01 module should be kept away from the outlet of wind in measuring pressure value. Dust or other foreign substance should not block or cover the measuring hole of pressure sensor or else the pressure value will be inaccurate or be postponed in reading. 3. In measuring direction the module should be kept in horizontal level in order to get the correct value and should avoid to be used in strong magnetic environment such as large electromechanical equipment, iron mine, magnet, etc. If the product is equipped with speaker, the speaker should be turned off in case the magnetic field will interfere the compass. 4. If the sensor module is put or pass in strong magnetic environment, the compass should be calibrated after leaving such environment. The users also need to calibrate the compass for the first use when the finished products are sold on market Dorji Applied Technologies A division of Dorji Industrial Group Co., Ltd Add.: Xinchenhuayuan 2, Dalangnanlu, Longhua, Baoan district, Shenzhen, China 518109 Tel: 0086-755-28156122 Fax.: 0086-755-28156133 Email: sales@dorji.com Web: http://www.dorji.com Dorji Industrial Group Co., Ltd reserves the right to make corrections, modifi cations, improvements and other changes to its products and services at any time and to discontinue any pr oduct or service without notice. Customers are expected to visit websites for getting newest product information before placing orders. These products are not designed for use in life support appliances, devices or other products where malfunction of these products might result in personal injury. Customers using these products in such applications do so at their own risk and agree to fully indemnify Dorji Industrial Group for any damages resulting from improper use.