HP01-TQ ETC2 | Alldatasheet
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 6
Technical content
Features
. 14 Bit ENOB ADC resolution . Supply voltage 2.2-3.6v . -40°C to + 85°C operating range
Applications
. Pressure measurement and control systems . Weather forecast products Block Diagram
PRELIMINARY 2011-4-20 Version: 2.2 Pin Name Pin Number Type Function VSS 1 G power ground VDD 2 P power VCC MCLK 3 I master clock(32k) input XCLR* 4 I ADC reset inpu SDA 5 I/O . I²C data input and output SCL 6 I I2C clock input * XCLR is to reset the AD converter (active low). During the AD conversion phase, XCLR should stay high. After AD conversion end, keep XCLR pin low before another AD conversion starts. Absolute Maximum Ratings Parameter Symbol Min Max Unit Supply Voltage VDD -0.3 4.0 V Over pressure P 5 Bar(abs) Storage Temperature Tstg -40 125 °C Recommended Operating Conditions Parameter Symbol Conditions Min Typ Max Unit Supply Voltage VDD 2.2 3 3.6 V Supply Current I VDD=3V V During conversion 500 μΑ Stand by 1 μΑ Operating Pressure Range P 900 1100 Hpa (abs) Operating Temperature Range T -40 85 °C Conversion Time T MCLK=32k 35 ms Duty Cycle of MCLK 40% 50% 60% % Serial Date Rate SCL 100 KHZ Pressure and Temperature Output Characteristics HP01 system is able to reach the following characteristics: Parameter Symbol Conditions Min Typ Max Unit Resolution 0.1 hpa Accuracy 900-1100 -8 +10 hpa Pressure Sensitivity SNS 900-1100 Cnts/mbar Maximum Error Over Temperature 0~+55 -5.0 5.0 hpa Long Term Stability 12 month 1 hpa VDD Dependency 2.0~5.0 -1.5 0 1.5 hpa Temperature coefficient of sensitivity TCS -0.45 -0.55 -0.6 ∆D1/∆D2
PRELIMINARY 2011-4-20 Version: 2.2 Pressure Measurement The main function of HP01 system is to convert the uncompensated pressure and temperature signal from a pressure sensor. After the conversion, the following two values can be obtained: . measured temperature “D2” . measured pressure “D1” As the sensor is strongly temperature dependent, it is necessary to compensate for these effects. Therefore necessary temperature compensation is needed to achieve nominal accuracy. Pressure and Temperature Compensation Calculation: The following information is just a guide line for temperature compensate, the end user of this module should not be confined to this method. Many other methods can be deployed to achieve best accuracy. Step 1: (set relative pressure starting reference point, normally this step be done after power up or reset relative pressure) P0=1013.2hp D1(P0)=D1 D2(P0)=D2 Step 2: (normal pressure calculation with first order temperature compensation) dUT=D2-D2(P0) ; calculate current temperature difference with reference temperature dTCS=TCS*dUT ; calculate compensated pressure offset with temperature coefficients dUP=D1-dTCS-D1(P0) ; calculate temperature compensated pressure reading P2=dUP/SNS ; calculate pressure difference referred to starting pressure P0 P=P0+P2 ; calculate current relative pressure Example: D1(P0)=30000 (obtained afte r power up reading: D1) D2(P0)=4100 (obtained afte r power up reading: D2) TCS=-0.55 (nominal module value from this data sheet) SNS=27 (nominal module value from this data sheet) D1=30036 (current pressure AD reading from module) D2=4107 (current temperatur e AD reading from module) dUT = 4107-4100 = 7 dTCS=-0.55*7=-3.85 dUP=30036+3.85-30000=39
PRELIMINARY 2011-4-20 Version: 2.2 P2=39/27=1.44 Serial Interface The I2C interface is used for reading measurement result from AD conversion:D1 and D2. Reading Temperature and Pressure value:D1,D2 AD chip I2C address is set to 0xEE (device write address), 0xEF (device read address). In order to get the AD value D1 and D2, you have to follow the following timing sequence: Pressure Measure: S 11101110 A 11111111 A 11110000 A P D S 11101110 A 11111101 A S 11101111 A MSB A LSB N P Select pressure measurement Read AD value back Temperature Measure: S 11101110 A 11111111 A 11101000 A P D S 11101110 A 11111101 A S 11101111 A MSB A LSB N P Select temperature measurement Read AD value back S: I2C bus START (refer to AT24C02 EEPROM start command) P: I2C bus STOP (refer to AT24C02 EEPROM stop command) A (bold): I2C bus acknowledge by slave (SDA pull low: slave send out bit 0) A: I2C bus acknowledge by master (SDA pull low: master send out bit 0) N: I2C bus no acknowledge from master (SDA keep high: master send out bit 1 instead) D : delay for 38ms or above MSB: conversion result (MSB bit clocked out first) LSB: conversion result (MSB bit clocked out first). Remark: Before start an AD conversion cycle, remember to set XCLR pin high so that the system is no longer in the reset state (not valid for HP01).
PRELIMINARY 2011-4-20 Version: 2.2 All data read from the module is in hex format. After first power on, the first read data should be disregarded, and only the second value be used. This can assure that unstable reading after power on reset can be filtered out. Like any other semiconductor device, the sensor is sensitive to light. During the application of this sensor, please keep the sensor in dark place to achieve best accuracy. Since the module is not calibrated for sensitivity and temperature, thus only relative pressure can be calculated. If you need higher accuracy with temperature, please refer to our HP02 or HP03 series pressure module accordingly. Typical Application Circuit Diagram: Remark： In the battery supply product this application need be changed as: 32 KHz signal is outputted via the port of the MCU instead of the 32.768 KHz crystal to MCLK pin. The MCU will not output 32 KHz signal and keep low level when the HP01 enter to standby mode.
PRELIMINARY 2011-4-20 Version: 2.2 HP01-TQ Mechanical Dimension Important Notices Never unplug the module when power is on. Do not use this product as safety or emergency stop device or in any application where failure of this product could lead in personal injury. Failure to comply with these instructions could result with death or serious injury. Should buyer purchase or use HOPE RF products for any such unintended or unauthorized application, buyer should indemnify and hold HOPE RF and its officers, employees, affiliates and distributors harmless against all claims, costs, damages and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury associated with such unintended or unauthorized use, even if such claim alleges that HOPE RF was negligent regarding the design or manufacturing of the part. Hope RF reserves the right, without further notice, to change the product specification and/or information in this document and to improve reliability, functions and design.