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cmt 2110/17aw rev 1.2 | page 1 /25 www. hoperf .com cmt2110/ 17aw low - cost 240 ? 96 0 mhz ook transmitter copyright ? by cmostek features ? embedded eeprom ? very easy development with rfpdk ? all features programmable ? frequency range: ? 240 to 480 mhz (cmt2110aw) ? 24 0 to 96 0 mhz (cmt2117aw) ? ook modulation ? symbol rate: 0.5 to 30 ksps ? output power: - 10 to +13 dbm ? supply voltage: 1.8 to 3.6 v ? current consumption: 12.4 ma @ +10 dbm ? sleep curre nt : < 2 0 na ? fcc / etsi compliant ? rohs compliant ? 6 - pin sot23 - 6 package applications ? low - cost consumer electronics applications ? home and building automation ? remote fan controllers ? infrared transmitter replacements ? industrial monitoring and controls ? remote lighting control ? wireless alarm and security systems ? remote keyless entry (rke) descriptions the cmt 2110/17aw devices are ultra low - cost , highly flexible, high perfo rmance, single - chip ook transmitter s for various 240 to 96 0 mhz wireless applications. the cmt2110aw covers the frequency range from 240 to 480 mhz while the cmt2117aw covers the 240 to 960 mhz frequency range. t hey are part of the cmostek nextgenrf tm family, which include s a complete line of transmitters , receiver s and transc eivers. with ve ry low current consumption, the device modulates and transmits the data which is sent from the host mcu. a n em bedded eeprom allows the frequency, outpu t power and other features to be programmed into the chip using the cmostek usb programmer and rfpdk. a lternatively, in stock products of 433.92 /868.35 mhz are available for immediate demand s without the need of eeprom programming. the cmt2110/ 17aw uses a 1 - pin crystal oscillator circuit with the req uired crystal load capacitance integrated on - chip to minim ize the number of extern al c omponents . the cmt 2110/17aw transmitter together with the cmt2 2 1x receiver enable s a n ultra low cost rf link. sot23 - 6 ordering information part number frequency package moq cmt2110aw - esr 433.92 mhz sot23 -6 3,000 pcs cmt21 17aw - esr 868.35 mhz sot23 -6 3,000 pcs more ordering info: see page 20 1 2 3 4 5 6 xtal gnd data clk rfo vdd cmt 2110/17aw
cmt 2110/17aw rev 1.2 | page 2 /25 www. hoperf .com typical application data u1 xtal vdd gnd rfo 1 2 3 5 6 x1 4 clk data l2 l1 c2 c1 c0 vdd data clk j1 vdd 1 2 3 4 vdd cmt2110/17aw ant clk note: connector j1 is for eeprom programming figure 1 . cmt 2110/ 17 aw typical application schematic table 1 . bom of 433.92 / 868.35 mhz low - cost application designator descriptions value unit manufacturer 433.92 mhz 868.35 mhz [1] u1 cmt 2110/ 17aw , low - cost 240 ? 960 mhz ook transmitter - - cmostek x1 20 ppm, smd32*25 mm crystal 26 mhz epson c0 20%, 0402 x7r, 25 v 0.1 uf murata grm15 c1 5%, 0402 np0, 50 v 82 82 pf murata grm15 c2 5%, 0402 np0, 50 v 9 3.9 pf murata grm15 l1 5%, 0603 multi - layer chip inductor 180 100 nh murata lqg18 l2 5%, 0603 multi - layer chip inductor 27 8.2 nh murata lqg18 note: [1]. t he 868.35 mhz application is for cmt21 17aw only. table 2 . product selection table product frequency modulation max output power tx current consumption embedded eeprom cmt21 10aw 240- 480 mhz ook +13 dbm 13.4 ma (+10 dbm @ 433.92 mhz) cmt21 17aw 240- 960 mhz ook +13 dbm 15.5 ma ( +10 dbm @ 868.35 mhz)
cmt 2110/17aw rev 1.2 | page 3 /25 www. hoperf .com abbreviations abbreviations used in this data sheet are described below an application notes pa power amplifier bom bill of materials pc personal computer bsc basic spacing between centers pcb printed circuit board eeprom electrically erasable programmable read - only memory pn phase noise rclk reference clock esd electro - static discharge rf radio frequency esr equivalent series resistance rfpdk rf product development kit etsi european telecommunications standards institute rohs restriction of hazardous substances rx receiving, receiver fcc federal communications commission sot small - outline transistor max maximum sr symbol rate mcu microcontroller unit twi t wo - wire interface min minimum tx transmission, transmitter moq minimum order quantity typ typical np0 negative - positive - zero usb universal serial bus obw occupied bandwidth xo/xosc crystal oscillator ook on - off keying xtal crystal
cmt 2110/17aw rev 1.2 | page 4 /25 www. hoperf .com table of contents 1. electrical characteristics ............................................................................................................................................ 5 1.1 recommended operating conditions ................................................................................................................... 5 1.2 absolute maximum ratings ................................................................................................................................... 5 1.3 transmitter specifications ..................................................................................................................................... 6 1.4 crystal oscillator ................................................................................................................................................... 7 2. pin des criptions .......................................................................................................................................................... 8 3. typical performance characteristics ......................................................................................................................... 9 4. typical application schematics ............................................................................................................................... 10 4.1 low - cost application schematic ......................................................................................................................... 10 4.2 fcc/etsi compliant application schematic ....................................................................................................... 11 5. functional descriptions ............................................................................................................................................ 12 5.1 overview ............................................................................................................................................................. 12 5.2 modulation, frequency and symbol rate ........................................................................................................... 12 5.3 embedded eeprom and rfpdk ...................................................................................................................... 13 5.4 power amplifier ................................................................................................................................................... 14 5.5 pa ramping ........................................................................................................................................................ 14 5.6 crystal oscillator and rclk ................................................................................................................................ 15 6. working states and transmission control interface ............................................................................................. 16 6.1 working states .................................................................................................................................................... 16 6.2 transmission control interface ........................................................................................................................... 16 6.2.1 tx enabled by data pin rising edge ...................................................................................................... 17 6.2.2 tx enabled by data pin falling edge ..................................................................................................... 17 6.2.3 two - wire interface .................................................................................................................................... 17 7. ordering information ................................................................................................................................................. 20 8. package outline ......................................................................................................................................................... 21 9. top marking ............................................................................................................................................................... 22 9.1 cmt2110/17aw top marking ............................................................................................................................. 22 10. other documentations .............................................................................................................................................. 23 11. docu ment change list .............................................................................................................................................. 24 12. contact information .................................................................................................................................................. 25
cmt 2110/17aw rev 1.2 | page 5 /25 www. hoperf .com 1. electrical characteristics v dd = 3.3 v, t op = 25 , f rf = 433.92 mhz, output power is +10 dbm terminated in a matched 50 impedance, unless otherwise noted . 1.1 recommended operating conditions table 3 . recommended operation conditions parameter symbol conditions min typ max unit operation voltage supply v dd 1.8 3.6 v operation temperature t op - 40 85 supply voltage slew rate 1 mv/us 1.2 absolute maximum ratings table 4 . absolute maximum ratings [1] parameter symbol conditions min max unit supply voltage v dd - 0.3 3.6 v interface voltage v in - 0.3 v dd + 0.3 v junction temperature t j - 40 125 storage temperature t stg - 50 150 soldering temperature t sdr lasts at least 30 seconds 255 esd rating human body model (hbm) - 2 2 kv latch - up current @ 85 - 100 100 ma note: [1]. stresses above those listed as ?absolute maximum ratings? may cause permanent damage to the device. this is a stress rating only and functional operation of the device under these conditions is not implied. exposure to maximum rating conditions for extended periods may affect device reliability . caution! esd sensitive device. precaution should be used when handling the device in order to prevent permanent damage.
cmt 2110/17aw rev 1.2 | page 6 /25 www. hoperf .com 1.3 transmitter specifications table 5 . transmitter specifications parameter symbol conditions min typ max unit frequency range [1] f rf cmt21 10aw 240 480 mhz cmt21 17aw 240 960 mhz synthesizer frequency resolution f res f rf 48 0 mhz 198 hz f rf > 48 0 mhz 398 hz maximum output power p out (max) +13 dbm minimum output power p out(min) - 10 dbm output power step size p step 1 db pa ramping time [2] t ramp 0 1024 us current consumption @ 433.92 mhz i dd433.92 0 dbm, 50% duty cycle 6. 7 ma +10 dbm, 50% duty cycle 13.4 ma +13 dbm, 50% duty cycle 17.4 ma current consumption @ 868.35 mhz i dd 868.35 0 dbm, 50% duty cycle 8.0 ma +10 dbm, 50% duty cycle 1 5.5 ma +13 dbm, 50% duty cycle 1 9.9 ma sleep current i sleep 20 na symbol rate sr 0.5 30 ksps frequency tune time t tune 370 us phase noise @ 433.92 mhz pn 433.92 100 khz offset from f rf - 8 1 dbc/hz 200 khz offset from f rf - 8 3 dbc/hz 400 khz offset from f rf - 92 dbc/hz 600 khz offset from f rf - 9 7 dbc/hz 1.2 mhz offset from f rf - 107 dbc/hz phase noise @ 868.35 mhz pn 868.35 100 khz offset from f rf - 7 5 dbc/hz 200 khz offset from f rf - 7 7 dbc/hz 400 khz offset from f rf - 8 6 dbc/hz 600 khz offset from f rf - 91 dbc/hz 1.2 mhz offset from f rf - 101 dbc/hz harmonics output for 433.92 mhz [3] h2 433.92 2 nd harm @ 867.84 mhz, +13 dbm p out - 52 dbm h3 433.92 3 rd harm @ 1301.76 mhz, +13 dbm p out - 60 dbm harmonics output for 868.35 mhz [3] h2 868.35 2 nd harm @ 1736 .7 mhz, +13 dbm p out - 67 dbm h3 868.35 3 rd harm @ 260 5.05 mhz, +13 dbm p out - 55 dbm ook extinction ration 60 db note s : [1]. the frequency range is continuous over the specified range . [2]. 0 and 2 n us, n = 0 to 10, when set to ?0?, the pa output power will ramp to its configured value in the shortest possible time . [3]. the harmonics output is measured with the application shown as figure 10 .
cmt 2110/17aw rev 1.2 | page 7 /25 www. hoperf .com 1.4 c rystal oscillator table 6 . crystal oscillator specifications parameter symbol conditions min typ max unit crystal frequency [1] f xtal 26 26 26 mhz crystal tolerance [2] 20 ppm load capacitance [ 3 ] c load 12 20 pf crystal esr rm 60 xtal startup t ime [4] t xtal 400 us note s : [1]. the cmt 2110/ 17aw can directly work with external 26 mhz reference clock input to xtal pin ( a coupl ing capacitor is required) with amplitude 0.3 to 0.7 vpp . [2]. this is the total tolerance including (1) initial tolerance, (2) crystal loading, (3) aging, and (4) temperature dep endence. the acceptable crystal tolerance depends on rf frequency and channel spacing/bandwidth. [3]. t he required crystal load capacitance is integrated on - chip to minimize the number of external c omponents . [4]. this parameter is to a large degree crystal dependent .
cmt 2110/17aw rev 1.2 | page 8 /25 www. hoperf .com 2. pin descriptions 1 2 3 4 5 6 xtal gnd data clk rfo vdd figure 2 . cmt 2110/ 17 aw pin assignments table 7 . cmt 2110/ 17 aw pin descriptions pin number name i/o descriptions 1 xtal i 26 mhz single - ended crystal oscillator input or external 26 mhz reference clock input 2 gnd i ground 3 data io data input to be transmitted or data pin to access the embedded eeprom p ulled down internally to gnd when configured as transmission enabled by data pin falling edge and used as input pin p ulled up internally to vdd when configured as transmission enabled by data pin rising edge and used as input pin 4 clk i clock pin to control the device clock pin to access the embedded eeprom p ulled up internally to vdd 5 rfo o power amplifier output 6 vdd i power supply input
cmt 2110/17aw rev 1.2 | page 9 /25 www. hoperf .com 3. typical performance characteristics 13.2 dbm @ 433.92 mhz - 55.0 dbm @ 435.12 mhz - 60 - 50 - 40 - 30 - 20 - 10 0 10 20 432.42 432.72 433.02 433.32 433.62 433.92 434.22 434.52 434.82 435.12 435.42 power (dbm) frequency (mhz) rbw = 10 khz phase noise 13.0 dbm @ 868.35 mhz - 55.9 dbm @ 869.55 mhz - 65 - 55 - 45 - 35 - 25 - 15 - 5 5 15 866.85 867.1 867.35 867.6 867.85 868.1 868.35 868.6 868.85 869.1 869.35 869.6 869.85 power (dbm) frequency (mhz) (rbw = 10 khz) phase noise @ 868.35 mhz - 50 - 40 - 30 - 20 - 10 0 10 433.18 433.37 433.55 433.74 433.92 434.11 434.29 434.48 434.66 power (dbm) frequency (mhz) ook spectrum, sr = 9.6 ksps - 50 - 40 - 30 - 20 - 10 0 10 433.17 433.37 433.57 433.77 433.97 434.17 434.37 434.57 power (dbm) frequency (mhz) spectrum of various pa ramping options 128 us 64 us 32 us 16 us 8 us 4 us - 50 - 40 - 30 - 20 - 10 0 10 433.17 433.37 433.57 433.77 433.97 434.17 434.37 434.57 power (dbm) frequency (mhz) spectrum of various pa ramping options 1024 us 512 us 256 us 128 us 64 us 32 us sr = 1.2 ksps - 2 0 2 4 6 8 10 12 14 1.6 1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 3.8 power (dbm) supply voltage v dd (v) p out vs. v dd 0 dbm +10 dbm +13 dbm figure 5 . ook spectrum , sr = 9.6 ksps , p out = +10 dbm, t ramp = 32 us figure 6 . spectrum of pa ramping, sr = 9.6 ksps , p out = +10 dbm figure 8 . spectrum of pa ramping, sr = 1.2 ksps , p out = +10 dbm fig ure 4 . phase noise, f rf = 868.35 mhz, p out = +13 dbm, unmodulated fi gure 3 . phase nois e, f rf = 433.92 mhz, p out = +13 dbm, un modulated figure 7 . output power vs. supply voltages, f rf = 433.92 mhz
cmt 2110/17aw rev 1.2 | page 10/25 www. hoperf .com 4. typical application schematics 4.1 low - cost application schematic data u1 xtal vdd gnd rfo 1 2 3 5 6 x1 4 clk data l2 l1 c2 c1 c0 vdd data clk j1 vdd 1 2 3 4 vdd cmt2110/17aw ant clk note: connector j1 is for eeprom programming figure 9 . low - cost application sch ematic note s : 1. connector j1 is a must for the cmt 2110/ 17aw eeprom access during development or manufacture. 2. t he general layout guidelines are listed below. for more design details, please ref er to ?an10 1 cm t211x a schematic and pcb layout design guideline ? ? u se as much continuous ground plane metallization as possible . ? use as many grounding vias (especially near to the gnd pins) as possible to minimize series parasitic inductance between the ground pour and the gnd pins . ? avoid using long and/or thin transmission lines to connect the components . ? a void placing the nearby inductors in the same orientation to reduce the coupling between them . ? place c 0 as close to t he cmt 2110/ 17aw as possible for better filtering . 3. t he t able below shows the bom of 433.92 / 868.35 mhz low - cost application. f or the bo m of 315 /915 mhz application, please refer t o ? an101 c mt211x a schematic and pcb layout design guideline ? . table 8 . bom of 433.92 / 868.35 mhz low - cost application designator descriptions value unit manufacturer 433.92 mhz 868.35 mhz [1] u1 cmt 2110/ 17aw , low - cost 240 ? 960 mhz ook transmitter - - cmostek x1 20 ppm, smd32*25 mm crystal 26 mhz epson c0 20%, 0402 x7r, 25 v 0.1 uf murata grm15 c1 5%, 0402 np0, 50 v 82 82 pf murata grm15 c2 5%, 0402 np0, 50 v 9 3.9 pf murata grm15 l1 5%, 0603 multi - layer chip inductor 180 100 nh murata lqg18 l2 5%, 0603 multi - layer chip inductor 27 8.2 nh murata lqg18 note: [1]. t he 868.35 mhz application is for cmt21 17aw only.
cmt 2110/17aw rev 1.2 | page 11 /25 www. hoperf .com 4.2 fcc/etsi compliant application schematic data u1 xtal vdd gnd rfo 1 2 3 5 6 x1 4 clk data c0 vdd data clk j1 vdd gnd vdd 1 2 3 4 cmt2110/17aw clk note: connector j1 is for eeprom programming c1 l2 l1 c2 vdd c3 l3 ant figure 10 . fcc/etsi compliant application schematic note s : 1. connector j1 is a must for the cmt 2110/ 17aw eeprom access during development or manufacture. 2. t he general layout guidelines are listed below. for more design details, please refe r to ?an10 1 cmt211x a schematic and pcb layout design guideline ? . ? u se as much continuous ground plane metallization as possible. ? use as many grounding vias (especially near to the gnd pins) as possible to minimize series parasitic inductance between the ground pour and the gnd pins. ? avoid using long and/or thin transmission lines to connect the components. ? a void placing the nearby inductors in the same orientation to reduce the coupling between them . ? place c 0 as close to the cmt 2110/ 17aw as possible for better filtering . 3. t he t able below shows the bom of 433.92 / 868.35 mhz fcc/etsi compliant application. f or the b om of 315 /915 mhz application, please refer to ? an101 cmt211x a schematic and pcb layout d esign guideline ? . table 9 . bom of 433.92/ 868.35 mhz fcc/etsi compliant application designator descriptions value unit manufacturer 433.92 mhz 868.35 mhz [1] u1 cmt 2110/ 17aw , low - cost 240 ? 960 mhz ook transmitter - - cmostek x 1 20 ppm , smd32*25 mm crystal 26 mhz epson c 0 20% , 0402 x7r , 25 v 0.1 uf murata grm15 c1 5% , 0402 np0, 50 v 68 68 pf murata grm15 c 2 5% , 0402 np0, 50 v 15 9 .1 pf murata grm15 c3 5% , 0402 np0, 50 v 15 8.2 pf murata grm15 l1 5% , 0603 multi - layer chip inductor 180 100 nh murata lqg 18 l 2 5% , 0603 multi - layer chip inductor 36 8.2 nh murata lqg 18 l3 5% , 0603 multi - layer chip inductor 18 8.2 nh murata lqg 18 note: [1]. t he 868.35 mhz application is for cmt21 17aw only.
cmt 2110/17aw rev 1.2 | page 12/25 www. hoperf .com 5. functional descriptions ldos pfd/cp fractional-n div interface and digital logic eeprom loop filter ook modulator ramp control vco xosc vdd gnd xtal clk data rfo por bandgap pa figure 11 . cmt 2110/ 17aw functional block diagram 5.1 overview the cmt 2110/ 17aw is a n ultra low - cost , highly flexible, high performance, single - chip ook transmitter for various 240 to 960 mhz wireless applications. the cmt21 10aw covers the frequency range from 240 to 480 mhz while the cmt2117 covers the 240 to 960 mhz frequency range. t hey are part of the cmostek nextgenrf tm family, which include s a complete line of transmitters , receiver s and transceivers. t he chip is optimized for the low system cost, low power consumption, battery powered application with its highly integrated and low power design. t he functional block diagram of the cmt 2110/ 17aw is shown in the f igure above . t he cmt 2110/ 17aw is based on direct synthesis of the rf frequency, and the frequency is generated by a low - noise fractional - n frequency synthesizer . i t uses a 1 - pin crystal oscillator circuit with the required crystal load capacitance integrated on - chip to minimize the number of external c omponents . e very analog block is calibrated on each power - on reset (por) to the highly accurate ref erence voltage internally . t he calibration can help t he chip to finely work under different temperatures and supply voltages. t he cmt 2110/ 17aw uses the data pin for the host mcu to send in the data. the input data will be modulated an d sent out by a highly efficient pa which output power can be configure d from - 10 to +13 dbm in 1 db step size. rf frequency , pa output power and other product features can be programmed into the embedded eeprom by the rfpdk and usb programmer . this saves the cost and simplif ies the product development and manufactur ing effort . a lternatively, in stock products of 433.92 / 868.35 mhz are available for immediate demands with no need of eeprom programming. t he cmt 2110/ 17aw operates from 1.8 to 3.6 v so that it can finely work with most batteries to their useful power limits. w orking under 3.3 v supply voltage when transmitting signal at +10 dbm power, i t only consumes 1 3 . 4 ma at 433.92 mhz and 15.5 ma at 868.35 mhz. 5.2 modulation, frequency and symbol rate the cmt 2110/ 17aw supports ook modulation with the symbol rate up to 3 0 ksps . t he cmt21 10aw covers the frequency range from 240 to 480 mhz , while the cmt21 17aw covers the frequency range from 240 to 960 mhz, including the license free ism frequency band around 315 mhz, 433.92 mhz, 868.35 mhz and 915 mhz. t he device contains a high spectrum purity low power fractional - n frequency synthesizer with output frequency resolution better than 198 hz when the frequency is lower than 480 mhz, and the frequency resolution is 397 hz when the frequency is higher than 48 0 mhz . see the t able below for the modulation, frequency and symbol rate specifications .
cmt 2110/17aw rev 1.2 | page 13/25 www. hoperf .com table 10 . modulation, frequency and symbol rate parameter value unit modulation ook - frequency (cmt21 10aw ) 240 to 480 mhz frequency (cmt21 17aw ) 240 to 96 0 mhz frequency resolution (f rf 48 0 mhz) 198 hz frequency resolution (f rf > 48 0 mhz) 397 hz symbol rate 0.5 to 3 0 ksps 5.3 embedded eepro m and rfpdk the rfpdk (rf product s development kit) is a very user - friendly software tool delivered for the user configur ing the cmt 2110/ 17aw in the most intuitional way. the use r only needs to fill in/ select the proper value of each parameter and click the ? burn ? button to complete the chip configuration. no register access and control is required in th e application program . see the f igure below for the accessing of the eeprom and table 11 for the summary of all the configurable parameters of the cmt 2110/ 17aw i n the rfpdk . cmt2110/17aw interface cmostek usb programmer clk data rfpdk eeprom figure 12 . accessing embedded eeprom for more detail s of the cmostek usb programmer and the rfpdk , please refer to ? an 103 cmt211xa - 221xa one - way rf link development kits users guide ? . f o r the detail of cmt2110/ 17aw configurations with the rfpdk , please refer to ? an102 cmt2110/ 17a configuration guideline ? . table 11 . configurable parameters in rfpdk category parameters descriptions default mode rf settings frequency (cmt21 10aw ) t o input a desired transmitting radio frequency in the range from 240 to 480 mhz . the step size is 0.001 mhz. 433.92 mhz basic advanced frequency (cmt21 17aw ) t o input a desired transmitting radio frequency in the range from 240 to 96 0 mhz . the step size is 0.001 mhz. 868.35 mhz basic advanced tx power to select a proper transmitting output power from - 10 dbm to +14 dbm , 1 dbm margin is given above +13 dbm. + 1 3 dbm basic advanced xtal cload on - chip xosc load capacitance options: from 1 0 to 2 2 pf . 15 pf basic advanced pa ramping to control pa output power ramp up/down time, options are 0 and 2 n us (n from 0 to 10) . 0 us advanced transmitting settings start by start condition of a transmitting cycle, by data pin rising/falling edge . data pin rising edge advanced stop by stop condition of a transmitting cycle, by data pin holding low for 20 to 90 ms . data pin holding low for 2 0 ms advanced
cmt 2110/17aw rev 1.2 | page 14/25 www. hoperf .com 5.4 p ower amplifier a high ly efficien t single - ended power amplifier (pa) is integrated in the cmt 2110/ 17aw to transmit the modulated signal out . depending on the application, the user can design a matching network for the pa to exhibit optimum efficiency at the desired output power for a wide range of antennas, s uch as loop or monopole antenna . typical application schematics and the required bom are shown in ? chapter 4 typical application schematic ? . for the schematic , layout guideline and the other detail ed information please refer to ? an101 cmt211x a schematic and pcb layout design guideline ? . the output power of the pa can be configured by the user within the range from - 10 dbm to +13 dbm in 1 db step size using the cmostek usb programmer and rfpdk. 5.5 pa ramp ing when the pa is switched on or off quickly, its changing input impedance momentarily disturbs the vco output frequency. this process is called vco pulling, and it manifests as spectral splatter or spurs in the output spectrum around the desired carrier frequency. by gradually ramping the pa on and off, pa transient spurs are minimized. the cmt 2110/ 17aw has built - in pa ramping configurability with options of 0 , 1, 2, 4, 8, 16, 32, 64, 128, 256, 512 and 1024 us , a s shown in figure 13 . w hen the option is set to ? 0 ? , the pa output power will ramp up to its configured value in the shortest possible time. the ramp down time is i dentical to the ramp up time in the same configuration. cmostek recommends that the maximum symbol rate should be no higher than 1/2 of the pa ramping ? rate ? , as shown in the formula below: sr max 0.5 * ( 1 t ramp ) i n which the pa ramping ? rate ? is given by (1/t ramp ). i n other words, by knowing the maximum symbol rate in the application, the pa ramping time can be calculated by: t ramp 0.5 * ( 1 sr max ) the user can select one of the values of the t ramp in the available options that meet the above requirement. if somehow the t ramp is set to be longer than ? 0.5 * (1/sr m ax ) ? , it will possibly bring additional challenges to the ook demodulation of the r x device. f or more detail of calculating t ramp , please refer to ? an102 cmt211 0/ 17a configuration guideline ? . time rfo amplitude time data logic 1 logic 0 1024 us 512 us 8 us 4 us 2 us 1 us 0 us figure 13 . pa ramp ing time
cmt 2110/17aw rev 1.2 | page 15/25 www. hoperf .com 5.6 crystal oscillator and rclk t he cmt2110/ 17aw uses a 1 - pin crystal oscillator circuit with the required crystal load capacitance integrated on - chip . figure 14 shows the configuration of the xtal circuitry and the crystal model. the recommended specification for the crystal is 26 mhz with 20 ppm, esr (rm) < 6 0 , load capacitance c lo ad ranging from 12 to 20 pf. to save the external load capacitors, a set of variable load capacitors c l is built in side the cmt2110/ 17aw to support the oscillation of the crystal . t he value of load capacitors is configurable with the cmostek usb programmer and rfpdk. to achieve the best performance, the user only needs to input the desired value of the xtal load capacitance c load of the c rystal (can be found in the datasheet of the crystal) to the rfpdk , then fine ly tune the required xo load capacitance according to the actual xo frequency. please refer to ? an103 cmt211xa - 221xa one - way rf link development kits users guide ? for the method o f choosing the right value of c l . cmt2110/17aw xtal crystal model rm cm c l c0 lm cmt2110/17aw xtal c l rclk 26 mhz cc 0 . 3 C 0 . 7 vpp if a 26 mhz rclk (reference clock) is available in the system, the user can directly use it to drive the cmt2110/ 17aw by feed ing the clock into the chip via the xtal pin. this further sav es the system cost due to the removal of the crystal. a coupling capacitor is required if the rclk is used. the recommended amplitude of the rclk is 0.3 to 0.7 vpp on the xtal pin. also, the user should set the internal load capacitor c l to its minimum value. see figure 15 for the rclk circuitry . figure 14 . xtal circuitry and crystal model figure 15 . rclk circuitry
cmt 2110/17aw rev 1.2 | page 16/25 www. hoperf .com 6. working states and transmission control interface 6.1 working states t he cmt2110/ 17aw has 4 different working states: sleep, xo - startup , tune and transmit . sleep w hen the cmt2110/ 17aw is in the sleep state , all the internal blocks are turned off and the current consumption is minimized to 20 na typically . xo - start up after detecting a valid control signal on data pin, the cmt2110/ 17aw goes into the xo - startup state, and the internal xo starts to work. the valid control signal can be a rising or falling edge on the data pin, which can be configured on the rfpd k. the host mcu has to wait for the t xtal to allow the xo to get stable. the t xtal is to a large degree crystal dependent . a typical value of t xta l is provided in table 12 . tune t he frequency synthesizer will tune the cmt2110/ 17aw to the desired frequency in the time t tune . t he pa can be turned on to transmit the incoming data only after the tune state is done, before that the incoming data will not be transmitted. see figure 16 and figure 17 for the details. transmit the cmt2110/ 17aw starts to modulate and transmit the data coming from the data pin. the transmission can be ended in 2 methods: firstly, driving the data pin low for t stop time, where the t stop can be configured from 20 to 90 ms on the rfpdk; secondly, issuing soft_rst co mmand over the two - wire interface, this will stop the transmission in 1 ms. see section 6.2.3 for details of the two - wire interface. table 12. timing i n different working states parameter symbol min typ max unit xtal startup time [1] t xtal 400 us time to t une to d esired f requency t tune 370 us hold time after rising edge t hold 10 ns time to s top t he t ransmission [2] t stop 20 90 ms note s : [1]. this parameter is to a large degree crystal dependent . [2]. configurable from 20 to 90 ms in 10 ms step size . 6.2 transmission control interface t he cmt2110/ 17aw uses the data pin for the host mcu to send in data for modulation and transmission. t he data pin can be used as pin for eeprom programming, data transmission, as well as controlling the transmission. t he transmission can be started by detecting rising or falling edge on the data pin, and stopped by driving the data pin low for t stop as shown in the table above. b esides communicating over the data pin, the host mcu can also communicate with the device over the t wo - wire interface , so that the transmission is more robust, and consumes less current. p lease note that the user is recommended to use the tx enabled by data pin rising edge, which is described in section 6.2.1 .
cmt 2110/17aw rev 1.2 | page 17/25 www. hoperf .com 6.2.1 tx enabled by data pin rising edge as shown in the figure 16 , o nce the cmt2110/ 17aw detects a rising edge on the data pin, it goes into the xo - start up state . the user has to pull the data pin high for at least 10 ns ( t hold ) after detecting the rising edge, as well as wait for the sum of t xtal and t tune before sending any useful information (data to be transmitted) into the chip on the data pin. the logic state of the data pin is ? d on't c are ? from the end of t hold till the e nd of t tune . in the transmit state, pa send s out the i nput data after they are modulated . the user has to pull the data pin low for t stop in order to end the transmission . sleep sleep transmit state pa out rf signals t stop t xtal tune xo-startup t tune data pin valid transmitted data don?t care 0 1 t hold 0 rising edge figure 16 . transmission enabled by data pin rising edge 6.2.2 tx enabled by data pin falling edge as shown in the figure 17 , o nce the cmt2110/ 17aw detects a falling edge on the data pin, it goes into xo - start up state and the xo start s to work . during the xo - start up state, the data pin need s to be pulled low. after the xo is settled , the cmt2110/ 17aw goes to the tune state . t he logic state of the data pin is ? d on't c are ? during the tune state. in the transmit state, pa send s out the i nput data after they are modulated . the user has to pull the data pin low for t stop in order to end the transmission. before starting the next transmit cycle, the user has to pull the data pin back to high. pa out sleep sleep state rf signals t xtal tune t tune data pin 1 0 don?t care valid transmitted data 0 1 t stop transmit xo-startup falling edge figure 17 . transmission enabled by data pin falling edge 6.2.3 two - wire interface f or power - saving and reliable transmission purpose s , the cmt2110/ 17aw is recommended to comm unicate with the host mcu over a two - wire interface (twi): data and clk. t he twi is designed to operate at a maximum of 1 mhz. the timing requirement and data transmission control through the twi are shown in this section .
cmt 2110/17aw rev 1.2 | page 18/25 www. hoperf .com table 13. twi requirements parameter symbol conditions min typ max unit digital i nput l evel h igh v ih 0.8 v dd digital i nput l evel low v il 0.2 v dd clk frequency f clk 10 1 , 000 k hz clk high time t ch 500 ns clk low time t cl 500 ns clk delay time t c d clk delay time for the first falling edge of the twi_rst command, see figure 20 20 1 5 , 000 ns data delay time t dd t he data delay time from the last clk rising edge of the twi command to the time data return to default state 15,000 ns data setup time t ds from data change to clk falling edge 20 ns data hold time t dh from clk falling edge to data change 200 ns t ds t dh t ch t cl clk data figure 18 . two - wire interface timing diagram on ce the device is power ed up, twi_rst and soft_rst should be issued to make sure the device works in sleep state robustly. on every transmission, twi_rst and twi_off should be issued before the transmission to make sure the twi circuit functions correctly. twi_rst and soft_rst shou ld be issue d again after the transmission for the device go ing back to sleep state reliably till the next transmission. the operation flow with twi is shown as the figure below. one transmission cycle (1) - twi_rst (2) - soft_rst (1) - twi_rst (2) - twi_off (1) - twi_rst (2) - soft_rst transmission reset twi one transmission cycle (1) - twi_rst (2) - twi_off (1) - twi_rst (2) - soft_rst transmission figure 19 . cmt2110/ 17aw operation flow with twi table 14. twi commands descriptions command descriptions twi_rst implemented by pulling the data pin low for 32 clock cycles and clocking in 0x8d00, 48 clock cycles in total. it only resets the twi circuit to make sure it function s correctly . t he data pin cannot detect the rising/falling edge to trigger transmission after this command, until the twi_off command is issued. notes: 1. p lease ensure the data pin is firmly pulled low during the first 32 clock cycles. 2. w hen the device is configured as transmission enabled by data pin falling e dge, in order to issue the twi_rst command correctly, the first falling edge of the clk should be sent t cd after the data falling edge, which should be longer than the minimum data setup time 20 ns, and shorter than 1 5 us,
cmt 2110/17aw rev 1.2 | page 19/25 www. hoperf .com command descriptions as shown in figure 20 . 3. when the device is configure d as transmission enabled by data pin rising edge, the default state of the data is low, there is no t cd requirement, as shown in figure 21 . twi_off im plemented by clocking in 0x8d02, 16 clock cycles in total. it turns off the twi circuit, and the data pin is able to detect the rising/falling edge to trigger transmission after this command, til l the twi_rst command is issued . t he command is shown as figure 22 . soft_rst implemented by clocking in 0xbd01 , 16 clock cycles in total. it resets all the other circuits of the chip except the twi circuit. th is command will trigger internal calibration for getting the optimal device performance. a fter issuing the soft_rst command, the host mcu should wait 1 ms before sending in any new comm and. a fter that, the device goes to sleep state. t he command is shown as figure 23 . clk 32 clock cycles 16 clock cycles data t cd 0 1 t dd 1 0x8d00 figure 20 . twi_rst command when transmission enabled by data pin falling edge clk 32 clock cycles 16 clock cycles data 0x8d00 0 0 figure 21 . twi_rst command when transmission enabled by data pin rising edge data clk 16 clock cycles 0x8d02 (twi_off) t dd default state data clk 16 clock cycles 0xbd01 (soft_rst) t dd default state t he data is generated by the host mcu on the rising edge of clk, and is sampled by the device on the falling edge . t he clk should be pulled up by the host mcu during the transmission shown in figure 19 . t he transmission process should refer to figure 16 or figure 17 for its timing requiremen t, depending on the ? start by ? setting configured on the rfpdk. the device will go to sleep state by driving the data low for t stop , or issuing soft_rst command . a helpful practice for the device to go to sleep is to issue twi_rst and soft_rst commands r ight after the useful data is transmitted, instead of waiting the t stop , this can save power significant ly. figure 22 . twi_off command figure 23 . soft_rst command
cmt 2110/17aw rev 1.2 | page 20/25 www. hoperf .com 7. ordering information table 15. cmt 2110/ 17 aw ordering information p art number description s package type package option operating condition moq / multiple cmt21 10aw - esr [1] low - cost 240 - 480 mhz ook transmitter sot23 - 6 tape & reel 1.8 to 3.6 v, - 40 to 85 3 , 000 cmt21 17aw - esr [1] low - cost 240- 960 mhz ook transmitter sot23 - 6 tape & reel 1.8 to 3.6 v, - 40 to 85 3,000 note s : [1]. ?e? stands for extended industrial product grade, which supports the temperature range from - 40 to +85 . ? s? stands for the package type of sot23 - 6 . ? r ? stands for the tape and reel package option, the minimum order quant ity (moq) for this option is 3,0 00 pieces . t he default frequency for cmt21 10aw - esr is 433.92 mhz, for cmt21 17aw - esr is 868.35 mhz, for the other settings, please refer to the table 11 of page 13 . visit www.cmostek.com/products to know more abo ut the product and product line. contact sales@cmostek.com or your local sales representatives for more information.
cmt 2110/17aw rev 1.2 | page 21/25 www. hoperf .com 8. package outline the 6 - pin sot23 - 6 illustrates the package d etails for the cmt 2110/ 17aw . table 16 lists the values for the dimensions shown in the illustration. c 0.25 l e1 d e1 e e b a a3 a2 a1 figure 24 . 6 - pin sot23 - 6 table 16. 6 - pin sot 23- 6 package dimensions symbol size (millimeters) min typ max a ? ? 1.35 a1 0.04 ? 0.15 a2 1.00 1.10 1.20 a3 0.55 0.65 0.75 b 0.38 ? 0.48 c 0. 08 ? 0.2 0 d 2.72 2.92 3.12 e 2.60 2.80 3.00 e1 1.40 1.60 1.80 e 0.95 bsc e1 1.90 bsc l 0.30 ? 0.60 0 ? 8
cmt 2110/17aw rev 1.2 | page 22/25 www. hoperf .com 9. top marking 9.1 cmt 2110/ 17aw top marking 1 2 3 6 5 4 0 a 1 2 3 6 5 4 7 a figure 25 . cmt21 10 aw (left) and cmt21 17 aw (right) top marking table 17. cmt 2110/ 17 aw top marking explanation top mark : 0a ?? / 7a ?? mark method: laser font size : 0.6 mm, r ight - j ustified 1 st letter: 0 , represents cmt21 10aw 7 , represents cmt21 17aw 2 nd letter: a : represents r evision a 3 rd ? 5 th letter: ?? : internal reference for data code tracking, a ssigned by the a ssembly h ouse
cmt 2110/17aw rev 1.2 | page 23/25 www. hoperf .com 10. other documentations table 18 . other d ocumentations for cmt 2110/ 17aw brief name description s an101 cmt211x a schematic and pcb layout design guideline detail s of cmt2110 /13/17 / 19 a w pcb schematic and layout design rules, rf matching network and other application layout design related issues . an10 2 cmt2110/ 17a configuration guideline detail s of configuring cmt2110/ 17aw features on the rfpdk . an 10 3 cmt211xa - 221xa one - way rf link development kits users guide user ? s guides for cmt211 x a w and cmt 221 x a w development kits, including evaluation board and evaluation module , cmostek usb programmer and the rfpdk .
cmt 2110/17aw rev 1.2 | page 24/25 www. hoperf .com 11. document change list table 19. document change list rev. no . chapter description of changes date 0. 7 all initial released v ersion 2014 - 0 3 - 0 4 0.8 0 1 3 4 5 add ordering information in first page update table 5 u pdate the title of figure 8 / 9 update the bom of typical application schematics u pdate section 5.3 embedded eeprom and rfpdk add section 5.5 pa ramp ing 2014 - 0 4 - 0 5 0. 85 1 3 update table 5 update figure 4 2014 - 0 4 - 0 8 0.9 0 5 7 u pdate ordering information in first page u pdate description u pdate 5.3, add table 11 update chapter 7 . o rdering information 2014 - 06- 1 4 1.0 - - 2014 - 06- 30 1.1 a ll 6 a dd product cmt21 17aw to the datasheet add section 6 . 2 .3 2015 - 01- 16 1.2 6 update section 6.2.3 2015 - 01- 23
cmt 2110/17aw rev 1.2 | page 25/25 www. hoperf .com 12. contact information hope microelectronics co., ltd . address: 2/f,building3,pingshan private enterprise science and technology park,xili town,nanshan district,shenzhen,china tel: +86 - 755 - 82973805 fax: +86 - 755- 82973550 email: sales@hoperf.com hoperf@gmail.com w ebsite: http://www.hoperf.com http://www.hoperf.c n the information furnished by cmostek is believed to be accurate and reliable. however, no responsibility is assumed for inaccuracies and specifications within this document are subject to change w ithout notice. the material contained herein is the exclusive property of cmostek and shall not be distributed, reproduced, or disclosed in whole or in part without prior written permission of cmostek. cmostek products are not authorized for use as critica l components in life support devices or systems without express written approval of cmostek. the cmostek logo is a registered trademark of cmostek microelectronics co., ltd. all other names are the property of their respective owners. copyright. cmostek microelectronics co., ltd. all rights are reserved.

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