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AKM Confidential                                                                  

AK2571  

Table 3-10 R_TV_OFFSET setting 

R_TV_OFFSET[4:0] 

E_TV_OFFSET[4:0] 

Offset voltage [mV] 

(Reference value) 

11111 +375 

11110 

+350 

11101 

+325 

| 

| 

10001 

+25 

10000 

0 

01111 

-25 

| 

| 

00010 

-350 

00001 

-375 

00000 

-400 

Default value of E_TV_OFFSET is set by AKM. 

 

3.7  Example schematics of connect ion to external components 

Figures 3-5 to 3-10 illustrate typical system connections. When connecting to a negative voltage source, use a level shifter to 
ensure that the signal voltages stays within the specified range.. In addition to that, I-DAC1 can’t be forced negative voltage 
supply. 

<Rev. 0.6E Preliminary>                                       -12-                                                  

2001/11 

Содержание AK2571

Страница 1: ...e temperature via an external thermister and uses the PID algorithmto controltheThermo ElectricCooler TEC Thisprovides 0 1 Cstabilization Acustomercanprogramthe appropriatePIDparametersintotheinternal...

Страница 2: ...Diagram Monitor DAC AMON I DAC4 Curret Amp Bypass CUALM Over Current TEMPALM Temperature ALM PIDALM TECControl current ALM WLALM Target Temperature ALM IOUT1 IOUT3 IOUT4H CSN SKN DI DO WAVE1 WAVE0 I D...

Страница 3: ...upplyadequatecurrentcorrespondingtotheambienttemperaturechangedetectedby theinternalT_Vconverter Pleasereferthepart 3 APC fordetails 1 2 ATC TheAK2571controlsTECtostabilizetheinputvoltagefromthetemper...

Страница 4: ...ow Classify AdditionalTag Contents Example APC APCrelate E_APC_FF_SET DAC I DACrelate E_DAC1_FIX ATC ATCrelate E_ATC_OFFSET ALM Alarmrelate E_ALM_POL PID PIDrelate E_PID_P LK ATCLockcounterrelate E_LK...

Страница 5: ...ion current R_APC_CMPNST PDGAIN Monitor PD APC_ COMP APC Target R_APC_TRGT OPALM_ COMP Optical out down threshold R_OPALM_SET PDIN IOUT3 I DAC3 ADDER PDMON RPD CPD DAC_APC OPALM_ GAIN DIGITAL FILTER R...

Страница 6: ...ax Output current corresponding to R_DAC1 data WhenR_DAC_SET 1 thisoutputsisenabled EA_MOD Dithering function R_EA_SW 0 Non Active 1 Active R_EA_FREQ Modulation frequencyselection 16kHz 000 32kHz 001...

Страница 7: ...gerrorcompensation CompensationcurrentoutputsareavailableforLDlightpowerdeterioration APC_COMPcomparesthefeedbackvoltage from PDIN vpd with the output voltage of DACAPC vapc_ref R_APC_TRGT Based on th...

Страница 8: ...equalsthevalueofR E _PDMON_SET Conversionexpression Gain 20 log 1 8 PDINvoltage 3 3 2 DACAPC Generatesthereferencevoltageforagingcompensation Table3 4indicatesthefunctionofR E _APC_TRGTandvapc_ref R_A...

Страница 9: ...5mA 2 5mA 10 15mA 2 5mAover 0 03mA I DAC2Gainsetting R_DAC1_GAIN E_DAC1_GAIN Gainsetvalue Max output current typ Setting range of outputcurrent typ Non missing code warrantyrange typ Current resolutio...

Страница 10: ...8 3 9explainsthesetting Figure3 3EABlockdiagram I DAC1 IOUT1 GAIN EA gain set R_EA_GAIN EA frequency set R_EA_FREQ Table3 8EADitheringfrequency R_EA_FREQ E_EA_FREQ Settingfrequency Typ Deviation typ R...

Страница 11: ...ehandandwritingthecompensationdatatrainedasdescribedbelow 1 Single pointtemperatureadjustment ReadR_TVatoneambienttemperature andusingtheT_VConv Gain 0 7degree LSB calculatesthe8 bitADCvalue andenteri...

Страница 12: ...010 350 00001 375 00000 400 DefaultvalueofE_TV_OFFSETissetbyAKM 3 7 Exampleschematicsofconnectiontoexternalcomponents Figures3 5to3 10illustratetypicalsystemconnections Whenconnectingtoanegativevoltag...

Страница 13: ...K2571 BIAS Current setting Voltage Modulation Current setting Voltage AK2571 LD DC LD A RF LD module I DAC2 IOUT2 I DAC3 IOUT3 Driver circuit VEE VEE BIAS current set voltage Modulation current set vo...

Страница 14: ...ck Alarm E_WLALM_SET WLALM I DAC4H IOUT4C REFOUT TEMPIN TEC control vtemp I DAC4C IOUT4H Temperature Target R_TMPRT__TRGT Parameter of ATC feed back E_ATC_FB_SET Non sensed value E_PID_INACT PID max v...

Страница 15: ...ing10bitsMSBdatafromPID Itsfull scaleoutputcurrentis50mA typ WhenAnalog 1isselected ControlthecurrentdirectionbyFET refertofigure4 4 itispossibleforI DAC4Htooutputbothcooling and heating current depen...

Страница 16: ...mperature R_TMPRT_TRGT Z 1 Differencial Parameter D Proportion Parameter P Integration Parameter I PID control value R_PID_VALABS E_PID_D E_PID_I E_PID_P PID integration value R_PID_INTGRL Table4 3 PI...

Страница 17: ...6Analogcontrol2 2 PID Current direction control TEC HEATP COOLP HEATN COOLN AK2571 Current amp IOUT4C I DAC4C IOUT4H I DAC4H PID Currnt direction control TEC HEATP COOLP HEATN COOLN AK2571 IOUT4C I D...

Страница 18: ...6 32 TS 7 32 TS 8 32 TS 9 32 31 31 31 TS 64 31 TS 63 TS 62 TS 61 4 4Gain Offset TheAK2571amplifies typicallyx13 theinputsignalfromthethermistertoprovidehigherresolutionforthe8 bitADC It also adds an o...

Страница 19: ...6 22 2 23 1 24 0 26 6 20 0 90 20 7 23 4 24 2 25 1 27 7 21 0 93 21 9 24 5 25 4 26 2 28 8 22 0 96 23 0 25 6 26 5 27 4 30 0 23 0 99 24 1 26 8 27 6 28 5 31 1 24 1 02 25 3 27 9 28 8 29 6 32 2 25 1 05 26 4...

Страница 20: ...18 9 22 0 23 0 24 1 27 1 20 0 90 20 2 23 3 24 3 25 3 28 4 21 0 93 21 5 24 6 25 6 26 6 29 7 22 0 96 22 7 25 8 26 9 27 9 31 0 23 0 99 24 0 27 1 28 1 29 2 32 3 24 1 02 25 3 28 4 29 4 30 5 33 6 25 1 05 26...

Страница 21: ...onisdescribedbelow 1 WithLD agingerrorengaged initiatetheAPCcompensationcircuit LDcompensationcurrent Digital isaddedto theI DACsselectedbyR_APC_CMPNST 2 Calculate the shift value of the target temper...

Страница 22: ...Cfunctionsaredisabledinthismode Figure5 1 Self operation mode POWER ON Register access mode EEPROM access mode RST RST RST RST Retain the value of Register Table5 1 Selfoperationmode Registeraccess EE...

Страница 23: ...g Usersetting Usersetting Usersetting Figure5 2Startupsequence Expiring count up of the settled I DAC move to next status Reset ATC_LK_COUNTER APC Count_Up Expiring ATC_LK_COUNTER tothe thereshold E_L...

Страница 24: ...sable 1 Enable Atc_alm Apc_alm 0 ALM Enable 1 ALM Disable Fix_ctrl 2 0 000 Start up or APC Count up Except000 Normal operation 5 2 3 ATCLock 1 Whentemperaturedata R_TMPRT_CRNT entersthetargettemperatu...

Страница 25: ...EC_ANALOGtoselectAnalog 1orAnalog 2 IfusingDigitalcontrol useregisterlR_TEC_PWM_SETtoset thePWMdivision 3 ATCadjustment 3 1 TemperatureAdjustment When a 1 is written to the R_CTRL_AKM Atc_main R_CTRL...

Страница 26: ...CFB Whenthe agingcompensationcurrent isaddedto theI DACoutput STATUS_MONbecomesHigh b R_CTRL_USER Apc_fb 1executestheAPCFeedbackfunction Inthisregisteraccessmode actuallytheAPC Feedbackfunctiondoesn t...

Страница 27: ...ement the value of R_DACx but do not reduce it too much as OPALM is output APC FeedbackbeginstofunctionandincreasesthevalueofR_APC_CMPNST Accordingtothisvalue R_ATC_CMPNSTis increased by the E_ATC_FB_...

Страница 28: ...ckworking 0 ATCFeedbacktargettemp shift 0 1 ATCFeedbacktargettemp shift 0 101 REG Registeraccessmode 0 SelfoperationorEEPROMmode 1 Registeraccessmode 110 PID_SIGN PIDcontroldirection 0 Heating 1 Cooli...

Страница 29: ...DAC3temperaturecompensationvalue 11 0000 1001 Wavelength 1settingdataforeachwavelength 1010 1111 Commonsettingdata 1 01 00 11 0000 1001 Wavelength 2data 1010 1111 Commonsettingdata 2 10 00 11 0000 10...

Страница 30: ...re compensation data xx 10 0000 1111 E_DAC3_TV xxxx1 E_DAC3_TV xxxx0 1 Settingdataforeachwavelength Table7 4and7 5indicatethedataconstructionforsettingdataofeachwavelength AddressisA3toA0 A7 A6 issetb...

Страница 31: ...rentset 0011 D15 D8 E_DAC1_FIX 8 I DAC1Fixed current set 2 0100 D7 D0 E_DAC2_FIX 8 I DAC2 Fixed current set 2 0100 D15 D8 E_DAC3_FIX 8 I DAC3 Fixed current set 2 0101 D7 D0 E_ATC_FB_MAX 8 ATC Feedback...

Страница 32: ...heexistenceofarelated register Table7 6 Commonsettingdataconstruction Address Name Bits Function Reg A7 A6 A5 A4 A3 A0 Setting E_TEC_ANALOG 1 TEC Analog way select 1 00 11 1010 0 Analog 1way 1 Analog...

Страница 33: ...0 Refer5 2 2 E_FIX_CTRL_USR 8 Normal operation set 2 1011 Refer5 2 2 E_LK_TMPRT_WIN 8 WindowsetforATC Lockwindow 1100 0 03 C LSB E_LK_CNT_SET 2 ATCLockperiodset 1100 00 2s 01 4s 10 8s 11 16s E_PID_D 8...

Страница 34: ...edfunctioninEEPROM Table8 1 ConstructionofRegisters RegisterName Bits Function EEP Address A5 A0 Setting R_PDGAIN 4 0 5 PDGAIN Set 1 000000 00000 0dB 11111 21 7dB 0 7dBStep refertable3 3 R_PDMON_SET 7...

Страница 35: ...0 I DAC1 1 I DAC2 2 I DAC3 R_APC_CNT_SET 5 4 2 APC Count up finalize I DAC select 1 000101 00 I DAC1 01 I DAC2 10 I DAC3 11 disable R_TV_OFFSET 4 0 5 Internal T_V conv Offset adjustment 1 000110 Refer...

Страница 36: ..._CMPNST 7 0 8 LDagingerrorcurrent 010100 R_ATC_CMPNST 7 0 8 Targettemperatureshiftvalue 010101 R_MON_DAC 7 0 8 MonitorDACset 010110 R_PDMOND 7 0 8 PDMONoutputdigitalvalue 010111 R_PID_INTGRL 7 0 8 PID...

Страница 37: ...R_TV_OFFSET 4 0 R W 0111 R_STATUS_SET R_MON_SET 3 0 R W 1000 R_OPALM_SET POL ALM_SH R W 1001 R_TIMER_SET R W 1010 R_TMPRT_TRGT 7 0 R W 1011 R_CTRL_USR 7 0 R W 1100 R_DAC1 7 0 R W 1101 R_DAC2 7 0 R W 1...

Страница 38: ...tatusoutputthroughDOpin CPOL CPHA 1 1 Statusoutputdisable 1 1 Registeraccess READ mode RDREG High Z 1 2 3 4 5 6 7 8 11 12 17 18 27 28 29 30 31 32 SK CSN 0 1 0 1 1 A5 A4 A3 A0 x DI D15 D14 D13 D3 D2 D1...

Страница 39: ...0 0 0 0 0 WRDS 0 0 1 1 WREN 1 4 EEPROMaccess WRITE mode WRITE High Z 1 0 1 0 0 1 0 0 A7 A6 A1 A0 D15 D14 D3 D2 D1 D0 1 2 3 4 5 6 7 8 9 10 15 16 17 18 29 30 31 32 SK CSN DI DO Te w READY READY 1 5 EEPR...

Страница 40: ...ationmode 1 1 1 1 I3 I2 I1 I0 x x x x x x x x x x 1 2 3 4 5 6 7 8 9 10 15 16 17 18 29 30 31 32 SK CSN DI I3 I2 I1 I0 0 0 0 0 Selfoperation NORMAL 0 1 1 1 Registeraccess REGMODE 1 1 1 0 EEPROMmode EEPM...

Страница 41: ...upsequencesameasPowerON 2 2 ShutdowncontrolthroughSHUT_ATCNpin SHUT_ATCN 0 makeAK2571allpowerdown Afteritsrelease AK2571startfromreset 2 3 ShutdowncontrolthroughSHUT_APCNpin SHUT_APCN 0 makeAK2571only...

Страница 42: ...ion TargettemperaturerangeforATC Nottestedbutdesigntargetvalue 3 Currentconsumption Parameter Symbol Min Typ Max Unite Remarks Currentconsumption allVDDpin IDD TBD mA 1 2 1 Excludeexternalload 2 Setti...

Страница 43: ...60 Referfigure2 CSNsetuptimebeforeSKfall CSN SK Tcss 100 ns Referfigure3 1 CSNholdtimeafterSKrise CSN SK Tcsh 100 ns Referfigure4 SKsetuptimebeforeCSNfall CSN SK Tsksl 100 ns Referfigure6 Input clock...

Страница 44: ...p DI Tdis Tdih DO High Z Figure3 inputcommandtiming Tpd CSN Tcsh DI DO Tpd Tpd Toz High Z D3 D2 D1 D0 SKN Figure4 dataoutputtiming SKN Tdis CSN Tcsh DI DO High Z D1 D0 Tdih Te w READY Tpd Trch Figure5...

Страница 45: ...put CSNmustbesethighonce 8 ADC Timesharing AtoDconverterInput Outputcharacteristics Parameter Condition min typ max Unite Resolution 8 DNL 1 LSB 2 2 LSB Step 1LSB 8 63 mV step Inputvoltagerange Peakvo...

Страница 46: ...SB 0 353 mA step Outputvoltage 1 8 5 DNL 1 LSB Inputdigitalcode D 7 0 00 h FF h straightbinary 1 atmaximum FF hsetting gainis 1 2 atminimum 00 hsetting gainis 1 3 outputcurrent Iidac1 isindicatedbythe...

Страница 47: ...cs Parameter Condition Min max Unite Remarks Resolution 8 bit 2 2 LSB Designtarget Default typ INL Maximumoutputcurrent 19 28 21 42 23 56 Minimumoutputcurrent 2 68 mA 2 5 0 084 mA step Outputvoltage V...

Страница 48: ...rrent Iidac4 asindicatedbytheexpressionbelow ifDAC4settingcodeis K Iidac4 50 64 255 K mA 4 Construct an external circuit to ensure that the IOUT4 voltage does not exceed this value If this value is ex...

Страница 49: ...V 1 0 1V step Designtarget TEMPINpin 0 4 1 5 V Designtarget Regulator voltage for thermister 2 3 V 5 Designtarget 1 PDINvoltageisuserprogrammablebyregistersetting Refer3 3 1 intherangeof0 4to1 1Vby0 1...

Страница 50: ...C1 21 NC NCpin ConnecttoGND 22 PDIN Monitors PD voltage input PD current is averaged by the external resistorandcapacitorinput 23 PDMON Outputgainedthermistervoltage 24 TESTA AKMTestpin ConnecttoGNDin...

Страница 51: ...value of target temperatureshiftisoverthethreshold 52 NC NCpin ConnecttoGND 53 COOLP P CH FET control signal for TEC PID control directs for cooling it becomesLow 54 HEATN N CH FET control signal for...

Страница 52: ...ed is1pin b AKMtrademark AKM c AKMmarking AK2571 d Datecode YYWWXXX YY Year WW Week 1 52 XXX LOTcode 0 17 0 05 1 0 0 2 0 5 0 2 1 70MAX 0 10 0 05 1 40 0 15 0 05 0 10 0 10 0 15 M 0 5 0 22 0 05 1 16 17 3...

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