HP01-TQ [HOPERF]

BAROMETER MODULE; 气压计模块


型号：	HP01-TQ
厂家：	HOPERF
描述：	BAROMETER MODULE 气压计模块
文件：	总6页 (文件大小：178K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

Hope RF

HP01-TQ

Version: 2.1

BAROMETER MODULE

2010-6-3

PRELIMINARY

. Integrated pressure sensor

. Pressure Range 750-1100hpa

. 16 Bit  ADC

. I²C Serial Interface

. One system clock line (32768Hz)

. Low voltage, low power

Description

The HP01 pressure module includes a piezo-resistive pressure sensor and an ADC

interface. It provides 16 bit word data for pressure and temperature related voltage. HP01

is a low power, low voltage device with automatic power down switching. I²C Serial

Interface is used for communications with a microprocessor.

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

Hope RF

HP01-TQ

Version: 2.1

BAROMETER MODULE

2010-6-3

PRELIMINARY

Pin Name

VSS

Pin Number

Type

Function

power ground

power VCC

VDD

MCLK

XCLR*

SDA

master clock(32k) input

ADC reset inpu

I/O

. I²C data input and output

I²C clock input

SCL

* 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

Supply Voltage

Over pressure

Symbol

VDD

Min

-0.3

Max

4.0

Unit

Bar(abs)

C

Storage Temperature

Tstg

-40

125

Recommended Operating Conditions

Parameter

Symbol Conditions

Min

Typ

Max

Unit

Supply Voltage

Supply Current

VDD

2.2

3.6

VDD=3V



During conversion

500



Stand by

Operating Pressure Range

900

-40

1100

Hpa (abs)

C

Operating Temperature Range

Conversion Time

MCLK=32k

Duty Cycle of MCLK

Serial Date Rate

40%

50%

60%

100

SCL

KHZ

Pressure and Temperature Output Characteristics

HP01 system is able to reach the following characteristics:

Parameter

Resolution

Accuracy

Symbol Conditions

900-1100

Min

0.1

-8

Typ

Max

+10

Unit

hpa

Pressure Sensitivity

SNS

900-1100

Cnts/mbar

Maximum Error Over Temperature

Long Term Stability

0~+55

12 month

2.0~5.0

-5.0

5.0

hpa

VDD Dependency

-1.5

1.5

∆D1∆D2

Temperature coefficient of sensitivity

TCS

-0.45

-0.55

-0.6

Hope RF

HP01-TQ

Version: 2.1

BAROMETER MODULE

2010-6-3

PRELIMINARY

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

. measured pressure

“D2”

“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)

dTCS=TCS*dUT

dUP=D1-dTCS-D1(P0)

P2=dUP/SNS

; calculate current temperature difference with reference temperature

; calculate compensated pressure offset with temperature coefficients

; calculate temperature compensated pressure reading

; calculate pressure difference referred to starting pressure P0

; calculate current relative pressure

P=P0+P2

Example:

D1(P0)=30000

D2(P0)=4100

TCS=-0.55

SNS=27

(obtained after power up reading: D1)

(obtained after power up reading: D2)

(nominal module value from this data sheet)

D1=30036

D2=4107

(current pressure AD reading from module)

(current temperature AD reading from module)

dUT = 4107-4100 = 7

dTCS=-0.55*7=-3.85

dUP=30036+3.85-30000=39

Hope RF

HP01-TQ

Version: 2.1

BAROMETER MODULE

2010-6-3

PRELIMINARY

P2=39/27=1.44

P=1013.2+1.44=1014.6

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 11111111 11110000 P D S 11101110 11111101 S 11101111 MSB A LSB N P

Select pressure measurement

Read AD value back

Temperature Measure:

S 11101110 11111111 11101000 P D S 11101110 11111101 S 11101111 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).

Hope RF

HP01-TQ

Version: 2.1

BAROMETER MODULE

2010-6-3

PRELIMINARY

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:

Hope RF

HP01-TQ

Version: 2.1

BAROMETER MODULE

2010-6-3

PRELIMINARY

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.

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