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AN118

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www.cmostek.com

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Study Time Window

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Document Change List

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Contact Information

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Содержание CMT2250A

Страница 1: ...developed by CMOSTEK for the NextGenRFTM product line Differing from traditional RF chip configuration methods which usually require complex software programming and register based controlling the RF...

Страница 2: ...y Exit 14 3 4 1 Application Example 1 Fixed Duty with Rx Early Exit 14 3 4 2 Application Example 2 Wake on Preamble with Rx Early Exit 15 4 OOK Settings 16 4 1 Demod Method 16 4 1 1 Fixed Threshold Me...

Страница 3: ...AN118 Rev 1 1 Page 3 31 www cmostek com 6 2 Factory Code 28 6 3 Study RSSI TH 29 6 4 Study Time Window 29 7 Document Change List 30 8 Contact Information 31...

Страница 4: ...250A can be CMT2250A EM V1 0 provided by CMOSTEK or the PCB designed by the user with CMT2250A Figure 1 CMT2250A Configuration Setup Start the RFPDK from the computer s desktop and select CMT2250A in...

Страница 5: ...AN118 Rev 1 1 Page 5 31 www cmostek com Figure 3 Advanced Mode of Device Control Panel...

Страница 6: ...rts OOK demodulation 2 3 Symbol Rate With OOK demodulation CMT2250A supports 0 1 40 0 ksps symbol rate The symbol rate tolerance of the device is from 25 to 25 of the Symbol Rate configured on the RFP...

Страница 7: ...l Stabilizing Time This defines the time for the device to wait for the crystal to get stable after it is powered up The user shall select one of the six options provided on the RFPDK that is most sui...

Страница 8: ...s WOR is on Basic Advanced Rx Time Ext The extended receive time in duty cycle mode the range is from 0 04 to 2 683 043 00 ms It is only available when the Wake On Radio is turned on 200 00 ms Advance...

Страница 9: ...r regularly to adept to the changeable environment and therefore remain its highest performance The device will continuously receive any incoming signals during the RX state and perform the decoding t...

Страница 10: ...ms Set the Rx Time to 1 second which is much longer than the packet length Let the Tx device to send out 3 continuous data packets in each transmission Because the Sleep Time is very short the non rec...

Страница 11: ...nger than the packet length times two plus the packet interval which is determined by the Tx setting symbol rate number of symbol per packet etc This ensures that the receiver always has a chance to c...

Страница 12: ...ceiving When the Rx timer is timeout at 400 ms the device switches back to the SLEEP state and repeat the same cycle continuously until it is powered down In this example the non receive time is 5 000...

Страница 13: ...h is 16 symbol SLEEP XTAL TUNE RX EXT RX Preamble time SLEEP XTAL TUNE RX Data Packet Data Packet Figure 14 The Transmitted Preamble Length Also as shown in the above figure for the Tx device the tran...

Страница 14: ...NA Wake On Radio Off Preamble NA Rx Early Exit On Valid Reception 1 packet This example is based on the one descript in Chapter 3 3 1 When no signal is being transmitted the device works in the fixed...

Страница 15: ...in Chapter 3 3 2 Because the Rx Early Exit function is turned on and the Valid Reception is set to 2 packets the device automatically exits the RX state as soon as 2 identical valid packets are succes...

Страница 16: ...6 9 12 or 15 2 Advanced Peak Drop Rate The RSSI peak drop rate the options are 1 step 4 symbols 1 step 2 symbols 1 step 1 symbols or 1 step 0 5 symbols 1 step 4 symbols Advanced 4 1 Demod Method The O...

Страница 17: ...ws the system to only receive the signals whose strength is above a preset value which is helpful for the user to control the communication distance between the Tx and the Rx 4 2 Fixed Demod TH This p...

Страница 18: ...e longer it takes for the peak to drop to the noise floor the more 0 the system can demodulate In practice the bottom of the dropping is the noise floor which varies depending on the different environ...

Страница 19: ...and 8 symbols bit in 2262 mode 3 Advanced Valid Reception This defines how many identical packets the device consecutively received represent a valid reception the options are 1 packet 2 packets 3 pa...

Страница 20: ...ymbol or 32 symbol None Basic Advanced Address Sync ID Length The range of the Sync ID Length is from 1 to 32 bits 32 bits Basic Advanced Address Sync ID Value The value of the Sync ID has the range f...

Страница 21: ...Packet Structure The study packet is used for the device to learn the Sync ID from the transmitter in order to pair with the transmitter It contains an optional Preamble a 32 symbol Head_S a Sync ID...

Страница 22: ...CMOSTEK has defined a 1527 Study Packet to support the ID study in 1527 mode The traditional packet introduced here is called the 1527 Normal Packet Figure 31 1527 Normal Packet Structure Table 12 Con...

Страница 23: ...sent and received starting from the LSB For example if the Sync ID Value is set to 1 the binary value of the Sync ID is 0000 0000 0000 0000 0001 In this case bit 0 1 is received first and bit 19 0 is...

Страница 24: ...l By using the CMOSTEK products the user does not need to adjust the OSC to define the symbol rate because the symbol rate is directly programmed The Bit Format is fixed at 8 symbols per bit Address S...

Страница 25: ...valid 2262 Sync 5 1 8 2262 Bit Format In 2262 packet a single bit is constructed by 8 symbols as shown below Please note that only the Address Sync ID field and the Data field have the unit of bit In...

Страница 26: ...t is set to 2 packets the device only updates the values of the data pins after consecutively receiving 2 identical valid packets Setting this parameter to 4 packets leads to the highest reliability o...

Страница 27: ...t the data pins back to their default values on the receiver The default values of the data pins are all 1 In 1920 and 1527 the number of bits of this code is fixed at 4 In 2262 the number of bits of...

Страница 28: ...refore the two devices are paired The Sync ID which is one of the elements of the packet is sometimes called Addressed in some communication protocols The lengths of the Sync ID are different in the d...

Страница 29: ...ance in which the device can study the Sync ID from the transmitter It is suggested for the user to perform on field testing and adjustment of the transmitting power of the Tx and the Study RSSI TH of...

Страница 30: ...w cmostek com 7 Document Change List Table 15 Document Change List Revision Chapter Description of Changes Date 0 8 Initial released version 2014 07 29 1 0 2014 08 13 1 1 3 Updated Figure 10 and relat...

Страница 31: ...r inaccuracies and specifications within this document are subject to change without notice The material contained herein is the exclusive property of CMOSTEK and shall not be distributed reproduced o...

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