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Application Guide

ChipCap® 2 Humidity and Temperature Sensor

7.5 Alarm Polarity (cont.)

Figure 24: Example of Alarm Function

Figure 25: Alarm Output Flow Chart

Time

Humidity (RH)

Alarm_Hi_On

Alarm_Hi_Off

Alarm_Low_Off

Alarm_Low_On

Hi Alarm Pin On

Lo Alarm Pin On

Lo Alarm Pin Off

Hysteresis

Hi Alarm Pin Off

Measurement<
Alarm_Low_On?

Measurement <
Alarm_High_Off?

Measurement >
Alarm_Low_Off

Measurement >
Alarm_High_On?

HIGH ALARM PIN

LOW ALARM PIN

Yes

Alarm = Off

Alarm = On

Содержание Telaire Chipcap 2

Страница 1: ...AAS 916 127 Rev J February 2018 Amphenol Advanced Sensors ChipCap 2 Application Guide...

Страница 2: ...Operating RH Range 3 1 7 Absolute Maximum Rating 3 1 8 Soldering Information 3 1 9 Package Contents 3 1 10 Dimensions 4 2 General Information 5 2 1 Important Safety Information 5 2 2 Preliminary Consi...

Страница 3: ...nded Operating Conditions 14 4 3 Output Pad Drive Strength 16 4 4 ESD Latch Up Protection 16 5 Communicating with ChipCap 2 17 5 1 Power On Sequence 17 5 2 I2C Features and Timing 17 5 3 Measurement M...

Страница 4: ...Temperature Sensor Contents 6 3 2 Polynomial Equation Temperature 31 7 Alarm Function Optional 32 7 1 Alarm Output 32 7 2 Alarm Registers 32 7 3 Alarm Operation 32 7 4 Alarm Output Configuration 32 7...

Страница 5: ...Contents ChipCap 2 Humidity and Temperature Sensor vi Application Guide...

Страница 6: ...curacies measured at 25 C 5 0V Custom accuracy tolerance available Repeatability 0 2 RH Hysteresis 1 0 RH Linearity 2 0 RH Response Time 4 0 sec 63 Measured at 25 C 1 m sec airflow for achieving 63 of...

Страница 7: ...ions 1 5 1 Supply Voltage min 2 3V to max 5 5V 1 5 2 Supply Current IDD 750 A typical 1 5 3 Sleep Current Isleep 0 6 A typical Resolution 14 bit 0 01 C Accuracy 0 3 C Accuracies measured at 25 C 5 0V...

Страница 8: ...r IR Solder Reflow Tp 240 C tp 40 sec qualify Pb free profile Note After soldering reconditioning will be required Details for this process can be found on page 8 1 9 Package Contents Capacitive polym...

Страница 9: ...ChipCap 2 Humidity and Temperature Sensor 4 Application Guide 1 10 Dimensions all measurements in mm inches...

Страница 10: ...loss and or personal injury 2 2 Preliminary Consideration To maximize the performance of ChipCap 2 it is important to plan an appropriate location of the sensor at the design stage Airflow and proper...

Страница 11: ...in pulse mode Keep the active state of the part to a minimum A typical sampling time is in the range from 0 5 1s The minimum is 0 2s and a maximum 10 duty cycle sampling time is recommended Sensor op...

Страница 12: ...of stabilization under room environment 23 3 C 55 5 RH Note We are testing if both hydration process 32 2 C 85 5 RH Duration 45 5 hours Non Baking Max time 50 hours and stabilization in ambient room e...

Страница 13: ...mal ESD precautions are required when handling in the assembly process 2 7 Reconditioning Procedure If ChipCap 2 is exposed to extreme conditions or contaminated with chemical vapors the following rec...

Страница 14: ...c code An electronic identification code stored on the chip can be decoded and allows for tracking on a batch level through production calibration and testing Figure 3 Laser Marking 2 10 Shipping Pack...

Страница 15: ...e 2 10 Shipping Package cont Figure 5 Packing Box Dimension 215 x 210 x 30 mm Inbox 500 ea Inbox 2 500 each Dimension 360 x 355 x 50 mm Outbox 5 000 each 5 x Inbox 500 Dimension 320 x 225 x 235 mm Out...

Страница 16: ...pply should be connected to VDD power supply pad 7 VDD and VSS Ground pad 6 should be decoupled with a 220nF capacitor IMPORTANT Vcore must not be connected to VDD and it must always be connected to a...

Страница 17: ...unicating with ChipCap 2 on page 18 3 1 3 Alarm Pads 1 Alarm Low 8 Alarm High The alarm output can be used to monitor whether the sensor reading has exceeded or fallen below pre programmed values The...

Страница 18: ...hould be connected to VDD power supply pad 7 VDD and VSS Ground pad 6 should be decoupled with a 220 nF capacitor IMPORTANT Vcore must not be connected to VDD and it must always be connected to an ext...

Страница 19: ...red pads 1 and 8 will be programmed at factory to use as Alarm_Low and Alarm_High respectively with required high and low humidity values In such a case ChipCap 2 will output the corrected humidity PD...

Страница 20: ...le 4 and the electrical specification is shown in Table 5 on the next page Table 3 Absolute Maximum Rating Parameter Symbol Min Max Unit Supply Voltage VDD VDD 0 3 6 0 V Supply Voltage at I O pads VIO...

Страница 21: ...0 90 VSUPPLY PDM Frequency fPDM fSYS 8 KHz Filter Settling Time1 tSETT 0 to 90 LPFilter 10kW 400nF 9 2 ms Ripple1 VRIPP 0 to 90 LPFilter 10kW 400nF 1 0 mV V PDM Additional Error Including Ratiometrici...

Страница 22: ...has ESD protection of up to 2000V The ESD test follows the Human Body Model with 1 5kOhm 100 pF based on MIL 883 Method 3015 7 Table 6 Output High Drive Strength Output High Drive Strength mA VSUPPLY...

Страница 23: ...set in EEPROM Factory Setting or for 3 ms if fast startup bit is set in EEPROM see Figure 11 If the ChipCap 2 receives the Start_CM command during the command window it enters and remains in Command M...

Страница 24: ...and Timing cont Table 8 I2C Parameters Parameter Symbol Min Typ Max Units SCL clock frequency fSCL 20 400 kHz Start condition hold time relative to SCL edge tHDSTA 0 1 s Minimum SCL clock low width 1...

Страница 25: ...1 Combined low and high widths must equal or exceed minimum SCL period Data setup time on SDA relative to SCL edge tSUDAT 0 1 s Stop condition setup time on SCL tSUSTO 0 1 s Bus free time between stop...

Страница 26: ...valid or stale see Table 9 on page 23 regarding the status bits As shown in Figure 13 below after a measurement cycle is complete valid data can be fetched If the next data fetch is performed too ear...

Страница 27: ...med during the power down period to fetch the data from the output register In I2 C the user can send another MR to start a new measurement cycle without fetching the previous data After the data has...

Страница 28: ...he Ready pin Figure 15 can also be used to tell when valid data is ready to be fetched 5 4 Status Bits Status bits the two MSBs of the fetched high data byte see Table 9 below are provided in I2 C but...

Страница 29: ...ndition Figure 16 on page 25 shows examples of fetching two three and four bytes respectively The full 14 bits of humidity data are fetched in the first two bytes The MSBs of the first byte are the st...

Страница 30: ...Master ACK Master ACK Master NACK 14 13 11 12 10 8 9 A 6 5 7 3 4 2 N 1 0 6 S 5 2 1 R 0 A 14 13 15 11 12 10 8 9 A 6 5 7 3 4 2 A 1 0 S 6 S 5 4 2 3 1 R 0 A 15 6 5 7 3 4 2 S N 1 0 3 4 I2 C DF 3 Bytes Sla...

Страница 31: ...A rise on the Ready pin indicates that new data is ready to be fetched from the I2 C interface The Ready pin stays high until a Data Fetch DF command is sent it stays high even if additional measurem...

Страница 32: ...for write The second byte is the command byte and the last two bytes form a 16 bit data field Figure 18 I2C Command Format Wait for Slave ACK Wait for Slave ACK Wait for Slave ACK Wait for Slave ACK D...

Страница 33: ...dle four bits of the response byte are command diagnostic bits where each bit represents a different diagnostic see Table 13 on page 29 Note Regardless of what the response bits are one or more of the...

Страница 34: ...ine if a command has finished executing the user can use the Ready pin In this case wait for the Ready pin to rise which indicates that the command has executed Then a data fetch can be performed to g...

Страница 35: ...a high voltage supply is not needed 1 I2 C DF Command Status Response 1 Byte Status Diagnostics Response 7 6 5 2 1 0 Status Diagnostics Response 7 6 5 2 1 0 ChipCap 2 Revision Data Byte 7 0 Device Sla...

Страница 36: ..._On High alarm on trip point 19HEX 13 0 0x3FFF Alarm_High_Off High alarm off trip point 1AHEX 13 0 0x0000 Alarm_Low_On Low alarm on trip point 1BHEX 13 0 0x0000 Alarm_Low_Off Low alarm off trip point...

Страница 37: ...PDM will begin outputting the new value See Figure 20 below for the PDM Timing Diagram Figure 20 PDM Signal Timing Diagram 6 2 Low Pass Filtering An analog output value is created by low pass filterin...

Страница 38: ...normalized ripple VPP mV V can be calculated as VPP mV V 4324 R k C nF Or the setting time tSETT for a 0 to 90 setting can be calculated as tSETT ms 0 0023 R k C nF 6 3 Analog Output Characteristics...

Страница 39: ...larms are needed see the section Alarm Polarity on the next page 7 3 Alarm Operation As shown in Figure 24 on page 37 the Alarm_High_On register determines where the high alarm trip point is and the A...

Страница 40: ...he Alarm_Low pin and it will act as a high alarm However in this case the effect of the alarm low registers is also changed the Alarm_Low_On register would act like the Alarm_High_Off register and the...

Страница 41: ...ut MCU interface when only a switch on off function is required at the desired humidity level e g bathroom vent fan humidifiers dehumidifiers Figure 23 LED control with Alarm Function ChipCap 2 PDM 1...

Страница 42: ...Time Humidity RH Alarm_Hi_On Alarm_Hi_Off Alarm_Low_Off Alarm_Low_On Hi Alarm Pin On Lo Alarm Pin OnG Lo Alarm Pin OffG Hysteresis Hysteresis Hi Alarm Pin Off Measurement Alarm_Low_On Measurement Alar...

Страница 43: ...Alarm_High_Cfg Configure the Alarm_High output pin 12 0 Ready_Open_Drain Ready pin is 0 Full push pull 1 Open drain 13 0 Fast_Startup Sets the Command Window length 0 10 ms Command Window 1 3 ms Comm...

Страница 44: ...Cap 2 analog 2 3 3v CC2D23S ChipCap 2 digital sleep mode 2 3 3v CC2D25S ChipCap 2 digital sleep mode 2 5v CC2D23 ChipCap 2 digital 2 3 3v CC2D25 ChipCap 2 digital 2 5v CC2D35 ChipCap 2 digital 3 5v CC...

Страница 45: ...ChipCap 2 Humidity and Temperature Sensor 40 Application Guide...

Страница 46: ......

Страница 47: ...l Advanced Sensors www amphenol sensors com Customer Support Centers North and South America Amphenol Thermometrics Inc St Marys Center 967 Windfall Road St Marys Pennsylvania 15857 U S A T 814 834 91...

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