View AK2570_5655699.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

asahi kase i [ AK2570 ] < ms 0115 - e - 0 0 > 2001 /10 1 AK2570 feed f orward apc lsi for l d m odule d escription AK2570 is the monolithic cmos lsi has the function of feed f orward aut o matic power control (apc) for the laser diode (ld) module and maintains the emission intensity of the ld module constant with the high accuracy . for stabilizing the emission intensity of the ld module affected by the ambient temperature, AK2570 feeds th e compensation voltage from the 2channels - 8bits d to a converter to control the bias - and the modulation - current for the ld module. the compensation voltage corresponds to the temperature characteristic data of the ld module retained in the on - chip eepr om and the ambient temperature detected by the on - chip thermo - sensor . AK2570 outputs the alarm signal for the weakened ld emission caused by the aging degradation with comparing the alarm threshold level and the signal from the monitoring photo diode (pd) . the data of the compensation voltage and the alarm threshold level retained in the on - chip eeprom can be set to suit for the characteristic s of each ld module. f eature realizing all apc function on 1 silicon chip control l ing the driving current ( the bias - and the modulation - current) for the ld module * consisting of the 2channels - 8bits d to a converter and the op - amp eeprom (electrically erasable programmable read only memory) * the non - volatile memory * the m emory capacity : address 9bits data 16bits * retaining the data of the compensation voltage and the trimming data of the t - sense offset voltage and the alm timing for each ld module on - chip t hermo - s ensor (t - sense) * detecting the ambie nt temperature and converting the detected temperature to the voltage on - chip a la r m circuit * o utput ting the alarm signal for the weakened ld emission caused by the aging degradation on - chip o scillator on - chip p ower on reset circuit serial interface +3.3v 10 % s ingle voltage supply low power consumption ( 30ma [ max ] ) small package ( 20 pin - ssop : 7.9mm 7.4mm )
asahi kasei [ AK2570 ] < ms 0115 - e - 00 > 2001/10 2 b lock d iagram eeprom power on reset oscillator register rda1 rda2 rda3 ratrm rtmp rint rvpd control da1 da2 (8bits) (8bits) da3 (8bits) ad1 ad2 (8bits) (8bits) vref amp1 amp2 comparator alm cs sk di do avdd dvdd avss dvss bias temptest envin almmod0 almmod1 vpdin fb2 fb1 daout1 daout2 shutdn alm timing generator t-sense almout
asahi kasei [ AK2570 ] < ms 0115 - e - 00 > 2001/10 3 AK2570 consists of these circuit blocks as below. circuit block function al d escription oscillator this circuit generat es the standard clock that settle s the timing for the sequence of t he internal circuit in s elf - operati o n mode (ordinary mode) . vref this circuit generat es the reference voltage for the a to d converter, the d to a converter and the t - sense . t - sense this circuit is the thermo - sensor , output s the voltage corresponding to the ambient temperature , i.e. the temperature to voltage converter , a nd transfer s this output voltage to ad2. also it integrates the offset adjustment circuit that cancels the distribution. ad1 the a to d converter en cod es the input voltage at vpdin - pin ( the signal f rom the monitor pd ) to the 8bits digital data . it is possible to read the en coded dat a of monitor pd signal (the reference data for rda3) held in rvpd register and to set the alarm threshold level for the degraded ld i n training mode . ad2 the a to d converter en codes the t - sense output signal to the 8bits digital data . in self - operati on mode , the en coded dat a of the ambient temperature detected by the t - sense is converted to the eeprom address and utilized for reading the temperature char a cter istic data of the ld retained in the eeprom. in training mode , it is possible to read the en coded data o f the detected temperature held in rtmp register. da1 , amp1 this block c onsist s of the d to a converter and the op - amp and control s the bias - or the modulation - current for the ld . da1 decodes the 8bits digit al data held in rda1 register to the compensat ion voltage for the temperature drift of the ld. inputting the h level signal to shutdn - pin makes that daout1 - pin output s 0v ( m in.) . da2 , amp2 this block consists of the d to a converter and the op - amp and control s the bias - or the modulation - current for the ld. da2 decodes the 8bits digital data held in rda2 register to the compensation voltage for t he temperature drift of the ld. inputting the h level signal to shutd n - pin makes that daout2 - pin output s 0v ( m in.) . da3 , alm out , comparat o r , alm timing generat or this block o utput s the h level alarm signal from alm - pin i n the case that the monitoring pd signal become s lower than the alarm threshold level retained in the eeprom and held i n rda 3 register , and t his case is caused by the aging degradation. eeprom this memory is the non - volatile memory , has the capacity address 9bits data 16bits and r etain s the data as below , 1. t he t emperature compensation data for the ld ( transferred to r da1 and r da2 registers ) and the alarm threshold level data for the degraded ld ( transferred to rda3 register ) corresponding to the ambient temperature ( the output from the t - snese and ad2) . 2. t he t rimming data for the t - s ense offset and the almout timing . register t his circuit t emporar il y stor es the ambient temperature data ( in rtmp register ) , the temperature compensation data for the ld ( in rda1 and rda2 registers ) , the alarm threshold level data ( in rd a3 register ) and so on. control this circuit c ontrol s the internal circuit, e.g. registers, with the seria l interface . power on reset at power on , this circuit initializes the data in all registers (see p.9) and sets AK2570 in self - operation mode .
asahi kasei [ AK2570 ] < ms 0115 - e - 00 > 2001/10 4 p in a ssignment [1] temptest [2] bias [4] daout1 [3] fb1 [5] fb2 [6] daout2 [7] avdd [8] avss [9] vpdin [10] alm [20] almmod0 [19] almmod1 [18] shutdn [17] dvdd [16] dvss [15] do [14] di [13] sk [12] cs [11] envin a k 2 5 7 0 n o name i / o t ype function ac load dc load remark 1 temptes t o a nalog output the voltage generated by the t - sense (factory use) 2 bias o analog output the current reference determined by the external resistance [ note 1 ] 3 fb1 i analog input the f eed back voltage to amp1 f or the gain control 4 daout1 o analog o utput the compensation voltage [1] for the ld < 20pf 5 fb2 i analog input the feed back voltage to amp2 for the gain control 6 daout2 o analog output the com pensation voltage [2] for the ld < 20pf 7 avdd i power supply the power for the analog part (+3.3v ) 8 avss i power ground t he analog part (0v ) 9 vpdin i analog input the signal of the monitor pd 10 alm o cmos output the aging alarm < 20pf 11 envin i cmos input the envelope signal used at burst transmission 12 cs i cmos input the chip select signal with the serial interface [ note 2 ] 13 sk i cmos input the shift clock with the serial interface 14 di i cmos input the data with the serial interface 15 do o cmos output the data with the serial interface < 100pf 16 dvss i power ground the digital part (0v ) 17 dvdd i power supply the power for the digital part (+3.3v ) 18 shutdn i cmos input the shut down signal for da1 and da2 see p. 15 19 almmod1 i cmos input the select signal [1] for the aging alarm mode see p.15 20 almmod0 i cmos input the select signal [0] for the aging alarm mode see p.15 [ note 1 ] : kindly insert the external register 75k w ( 1% ) between bi as - pin and avss . [ note 2 ] : it is necessary to input the l level signal to cs - pin at p ower on .
asahi kasei [ AK2570 ] < ms 0115 - e - 00 > 2001/10 5 f unctional d escription 1. explanation for the mode a k 2570 has the 2 operational modes, self - operation mode and training mode . after executing the evaluation and the adjust ment for the ld module incl uding AK2570 in training mode , it is possible to us e AK2570 ordinarily in self - operation mode for compensating the temperature drift of the ld mod ule. self - operation mode is the ordinary operational mode. i f the ambient temperature drifts , AK2570 can maintain the emission intensity of the ld module constant by executing the apc operation , i.e. controlling the bias - and the modulation - current for the ld module , periodically ( the compensation period is about 100ms ec ) in self - operation mode . (see p.6) on the oth er hand, i n training mode , it is possible to evaluate and adjust ak25 7 0 and the ld module by the access to the data in the eeprom and the registers . (see p.7) [a] cons titution of the mode and the command self-operation mode activating internal circuit register access eeprom access command for a/d operation command for resetting data in rda1-3 read-reg write-reg write-eep ewds ewen read- eep training mode initial setting command for selecting ad1 command for selecting ad2 [note1] [note2] command for self-operation mode command for training mode [ no te 1] while operating in self - operation mode , it is possible to shift to training mode by executing command for training mode and this is the only available comm and . that is to say that any other command is not effective in self - operation mode . [ note 2] on the other hand, while operating in training mode , it is possible to shift to self - operation mode by executing command for self - operation mode or forcing the l level signal to sk - pin for 50ms more and AK2570 shifts to self - operation mode with behav ing as same as the operation at p ower on .
asahi kasei [ AK2570 ] < ms 0115 - e - 00 > 2001/10 6 [ b] explana tion for the mode s and the command s (1) self - operation mode the on - chip p ower on r eset circuit initialize s the data in all registers and set s AK2570 in self - operation mode automatically at p ower on . in self - operation mode , AK2570 operates a s below and keeps the emission intensity of the ld module constant by period i cally applying the compensation voltage for the bias - and the modulation - current against the temperature drift of the ld module . in 50ms ec after the end of the reset ting operation at p ower on , the data in eeprom ( address = 1 1111 1111 [eint memory] ) is transferred to rint and ratrm registers. n otice that the data in these registers can not change except the case of executing p ower on aga i n or re - writing the data with executing write - reg command in training mode . in self - operation mode , the t - sense converts the detected ambient temperature to the voltage. ad2 encodes th is voltage to the 8bits digital data and transfer s this data to rtmp register. th is data is converted to the eeprom address and utilized for reading the temperature characteristic data of the ld retained in the eeprom. t h e eeprom data is transferred to rda1 ~ rda 3 registers and the output voltage of da1 ~ da3 are controlled . it is realized that the constant emission intensity of the ld is independent with the temperature drift by contr olling the bias - and the modulation - current for the ld module and the alarm signal for the weakened ld. this behavior is executed periodically ( the period is about 100ms ) . while operating in self - operation mode , it is impossible to execute any comma nd except command for training mode . note) reg0 register : this register synsthesizes the 32bits data and temporarily holds the data power on the 'power on reset' circuit operates and initializes the data in all registers. the data for rint & ratrm registers retained in eeprom (address="1 1111 1111") is transferred to reg0 register. the data is transferred from reg0 register to rint & ratrm registers. ad2 executes a to d conversion for the output voltage from the t-sense. the access to eeprom is executed with referring the data held in rtmp register. the data for rda3 register retained in eeprom (address = "x xxxx xxx1") is the data in reg0 register is transferred to rda1 ~ rda3 registers. it is waiting for the next compensatory operation. 0.6ms typ 50ms typ the period is about 100ms when transferring the data from the eeprom to the registers. the data for rda1~2 registers retained in eeprom (address = "x xxxx xxx0") is transferred to d31~d16 in reg0 register. transferred to d15~d8 in reg0 register. the output data "xxxx xxxx" generated by ad2 is transferred to rtmp register.
asahi kasei [ AK2570 ] < ms 0115 - e - 00 > 2001/10 7 (2) training mode training mode is used for the evaluation and the adju s tment about AK2570 . it is possible to write and read the data in the eerpom and the registers and to execute ac tivati ng the internal circuit for setting the temperature compensation data with the serial interface. not ic e that it is possible to shift to training mode by executing command for training mode and any other command is not available while operating i n self - operation mode . after executing command for training mode , it is necessary to input the clock or the h level signal to sk - pin continuously to keep the operational mode is in training mode . it is able to r eturn to self - operational mode by forcing the l level signal to sk - pin for 50ms ec more in training mode . in training mode , the periodical operation of temperature compensation for the ld is stopped. also at the time of executing command for training mode while operating in self - o perational mode , AK2570 transfers to training mode after completing the periodical operation. r ecommen d ed sequence in training mode start set the temperature at the minimum value for the u s e (e.g. -40 ) execute 'command for training mode' write '00000' in rint register ad2 executes a to d conversion confirm the code generated by ad2 add '+1' to the data n set the data for da1 & da2 that will be retained in after execting the a to d conversion in ad1 for complete the measurement for the compensation data make the data for writing in the eeprom write the compensatory data in the eeprom finish change the y y n --> initial setting : command for training mode --> register access : write-reg(rint) --> initial setting : command for selecting ad2 --> activating internal circuit : --> register access : read-reg(rtmp) --> register access --> register access : write-reg(rda1) --> register access : write-reg(rda2) --> register access : read-reg(rvpd) --> eeprom access : write- eep --> eeprom access : ewen --> evaluation for the ld characteristics --> adjusting the monitoring pd is '00000010'~'00001000' (e.g. -40 ) in rint register write-reg(rint) ambient temperature for the t-sense output command for a/d operation eda1 &eda2 to fit the ld characteristics rvpd register that will be retained in eda3 the input voltage to vpdin-pin, read the data in --> initial setting : command for selecting ad1 --> activating internal circuit : command for a/d operation --> register access : read-reg(rtmp) (see p.15)
asahi kasei [ AK2570 ] < ms 0115 - e - 00 > 2001/10 8 i ) initial s etting [1] command for s elf - operation mode by executing command for s elf - operation mode , it is possible to transfer the mode from training mode to self - operation mode . [2] command for t raining mode by executing command for t raining mode , it is possible to transfer the mode from self - operation mode to training mode . also any command except command for t raining mode is not available wh ile AK2570 operates in self - operation mode . [3] command for s electing ad1 command for s electing ad1 is available in training mode . this command set s that ad1 ( the a to d converter for the inpu t voltage to vpdin - pin ) is enable for the operation and the selector between ad1 and rvpd register is available . after this command is performed, the 8bits digital data of the vpdin - pin signal en coded in ad1 is stored in rvpd register by executing activating internal circuit - command for a/d operation . [4 ] command for s electing ad 2 command for s electing ad2 is available in training mode . this command set s that ad2 ( the a to d converter for the output voltag e from t - sense) is enable for the operation and the selector between ad2 and rtmp register is available . after this command is performed , the 8bits digital data of the t - sense output en coded in ad 2 is stored in rtmp register b y executing activating internal circuit - command for a/d operation . ii ) activating internal circuit [1] command for a/d operation command for a/d operation makes that the selected a to d converter (ad1 or ad2) operate s and the selected register (rvpd register or rtmp register) store s the data generated in the a to d converter selected by executing command for s electing ad1 or command for s electing ad2 . also this command make s only that the selected register stores the 8bits digital data generated by the selected a to d converter. [2] comma nd for r esetting data in rda1 - 3 command for r esetting data in rda1 - 3 sets that rda1 ~ rda3 registers hold the data retained in eeprom which address is nominated by the data in rtmp register . also this command is always available in training mode and independent with the selector se t by command for selecting ad1 or command for selecting ad2 . iii ) register a ccess [1] command for r eading the data in the register ( read - reg it is able to read the data held in the nominated register by executing read - reg command . [2] command for writing the data in the register (write - reg ) it is able to write the data in the nominated register by executing write - reg command .
asahi kasei [ AK2570 ] < ms 0115 - e - 00 > 2001/10 9 register map data name address d23 ~ d8 d7 d6 d5 d4 d3 d2 d1 d0 function rtmp 000 x ~ x d7 d6 d5 d4 d3 d2 d1 d0 holding the data (temperature) generated by ad2 rd a1 001 x ~ x d7 d6 d5 d4 d3 d2 d1 d0 holding the data for da1 rda2 010 x ~ x d7 d6 d5 d4 d3 d2 d1 d0 holding the data for da 2 rda3 011 x ~ x d7 d6 d5 d4 d3 d2 d1 d0 holding the data for da 3 rint 100 x ~ x x x x d4 d3 d2 d1 d0 holding the trimming data for t - sense [*1] rvpd 101 x ~ x d7 d6 d5 d4 d3 d2 d1 d0 holding the data ( vpdin ) generated by ad1 ratrm 110 x ~ x x x x d4 d3 d2 d1 d0 holding the trimming data for almout [*2] [ * 1 rint register stores the initial data for the offset voltage of the t - sense [ * 2] atrm register stor es the adjustment data for the alarm timing at the 50mbps and the 156mbps burst trans - mission ( akm recommend s to use the eeprom data for ratrm register already written at the shipment . i nitial register data name address d23 ~ d8 d7 d6 d5 d4 d3 d2 d1 d0 rtmp 000 x ~ x 1 1 1 1 1 1 1 1 rda1 001 x ~ x 0 0 0 0 0 0 0 0 rda2 010 x ~ x 0 0 0 0 0 0 0 0 rda3 011 x ~ x 0 0 0 0 0 0 0 0 rint 100 x ~ x x x x 0 0 0 0 0 rvpd 101 x ~ x 0 0 0 0 0 0 0 0 ratrm 110 x ~ x x x x 1 0 0 0 0 x is indefinite , 1 or 0 . iv ) eeprom a ccess [1] command for e nabling to write the data in the eeprom ( ewen ) ewen c ommand makes it possible to write the data in the eeprom. it is necessary to execute this command before writ ing the data in the eeprom , because it is automatically set at power on to prohibit writ ing the data in the eeprom . in training mode , it is always possible to write the data in the eeprom after executing this command except the case of p ower off or executing ewds command . [ 2 ] command for p rohibiting to write the data in the eeprom ( ewds ) ewds command makes it impossible to write the data in the eeprom and it is the same setting at p ower on . this command is available to change the setting to prohibit writ ing the data in the eep r om without p ower off . [3] command for w riting the data in the eeprom (write - eep) it is able to write the data in the nominated eeprom by exec uting write - eep command. and it is necessary to execute ewen command at first for permitting to write the data in the eeprom. [4] command for r eading the data in the eeprom ( read - eep) it is able to read the data held in the nominated eeprom by executing read - eep command.
asahi kasei [ AK2570 ] < ms 0115 - e - 00 > 2001/10 10 eeprom map address data name a8 - a0 d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 eda12 0 0000 0000 the data for rda1 ( 8bit ) the data for rda2 ( 8bit ) eda3 0 0000 0001 the data for rda 3 ( 8bit ) the unused bit s ( 8bit ) eda12 0 0000 0010 the data for rda1 ( 8bit ) the data for rda2 ( 8bit ) eda3 0 0000 0011 the data for rda 3 ( 8bit ) the unuse d bits ( 8bit ) | | | | eda12 1 1111 1100 the data for rda1 ( 8bit ) the data for rda2 ( 8bit ) eda3 1 1111 1101 the data for rda 3 ( 8bit ) the unused bits ( 8bit ) eres 1 1111 1110 the reserved bits (16bit ) eint 1 1111 1111 the unused bits ( 3bit ) the data for ratrm d12 - d8 ( 5bit ) the unused bits ( 3bit) the data for rint d4 - d0 ( 5bit ) akm cannot assure the period of the data retention ( 10year s [min.] at 85 c ) for the unused bits . kindly pay attention when wr iting the data for rint, because eint also retains the data for ratrm register written at akm. 2 serial interface in training mode , it is able to execute the access to the eeprom and the registers and to input the operational com mand for AK2570 with th e 32bits serial data via 4pins consist of cs(#12), s k( #1 3 ) , d i( #1 4 ) and d o( #1 5 ) . 1) constitution of the s erial interface data [a] initial setting , activating i nternal c ircuit and register a ccess ( total 32bit s ) classification selection a ddress d ata 4bit s 1bit 3bit s 24bit s [b] eeprom access (total 32bits) classification c ommand a ddress d ata 4bit s 2bit s 10bit s 16bit s < note > these bits contain the arbitrary bit ( the data is not definite , 0 or 1 ) . please refer to the table in the next page.
asahi kasei [ AK2570 ] < ms 0115 - e - 00 > 2001/10 11 ii) access to the serial interfac e classification select address data execution 1 0 0 0 x x x x x x x x x x x x x x x x x x x x x x x x command for ordinary mode 1 1 0 0 1 0 0 1 x x x x x x x x x x x x x x x x x x x x x x x x command for training mode [1]initial setting 1 0 1 0 x x x x x x x x x x x x x x x x x x x x x x x x command for selecting ad2 1 0 1 1 x x x x x x x x x x x x x x x x x x x x x x x x command for selecting ad1 1 1 1 1 1 0 0 0 x x x x x x x x x x x x x x x x x x x x x x x x command for a/d operation [2]a ctivating internal circuit 1 0 0 1 x x x x x x x x x x x x x x x x x x x x x x x x command for resetting data in rda1 - 3 0 0 0 0 x x x x x x x x x x x x x x x x d7 d6 d5 d4 d3 d2 d1 d0 read - reg (rtmp) 0 0 0 1 x x x x x x x x x x x x x x x x d7 d6 d5 d4 d3 d2 d1 d0 read - reg (rda1) 0 0 1 0 x x x x x x x x x x x x x x x x d7 d6 d5 d4 d3 d2 d1 d0 read - reg (rda2) 0 0 1 1 x x x x x x x x x x x x x x x x d7 d6 d5 d4 d3 d2 d1 d0 read - reg (rda3) 0 1 0 0 x x x x x x x x x x x x x x x x x x x d 4 d3 d2 d1 d0 read - reg (rint) 0 1 0 1 x x x x x x x x x x x x x x x x d7 d6 d5 d4 d3 d2 d1 d0 read - reg (rvpd) 1 1 1 0 0 1 1 0 x x x x x x x x x x x x x x x x x x x d4 d3 d2 d1 d0 read - reg (ratrm) [3]register access 1 0 0 0 x x x x x x x x x x x x x x x x d7 d6 d5 d4 d3 d2 d1 d0 write - reg (rtmp) 1 0 0 1 x x x x x x x x x x x x x x x x d7 d6 d5 d4 d3 d2 d1 d0 write - reg (rda1) 1 0 1 0 x x x x x x x x x x x x x x x x d7 d6 d5 d4 d3 d2 d1 d0 write - reg (rda2) 1 0 1 1 x x x x x x x x x x x x x x x x d7 d6 d5 d4 d3 d2 d1 d0 write - reg (rda3) 1 1 0 0 x x x x x x x x x x x x x x x x x x x d4 d3 d2 d1 d0 write - reg (rint) 1 1 0 1 x x x x x x x x x x x x x x x x d7 d6 d5 d4 d3 d2 d1 d0 write - reg (rvpd) 1 1 1 0 x x x x x x x x x x x x x x x x x x x d4 d3 d2 d1 d0 write - reg (ratrm) 0 0 0 0 0 x x x x x x x x x x x x x x x x x x x x x x x ewds 1 1 0 1 0 0 1 1 1 x x x x x x x x x x x x x x x x x x x x x x x ewen [4]eeprom access 0 1 x a8 a7 a6 a5 a4 a3 a2 a1 a0 d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 write - eep 1 0 x a8 a7 a6 a5 a4 a3 a2 a1 a0 d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 read - eep classification command address data execution note) x in this table is not definite , 0 or 1 .
asahi kasei [ AK2570 ] < ms 0115 - e - 00 > 2001/10 12 iii ) timing for the serial interface [1] initial s etting cs sk 0 1 2 3 4 5 6 7 8 9 10 30 31 di x --- command for self-operation mode --- command for training mode --- command for selecting ad2 --- command for selecting ad1 0 0 0 1 1 1 0 1 a2 a1 a0 0 0 0 0 0 0 1 1 x x x 1 a2 a1 a0 x [2] activating i nternal c ircuit [a] command for a/d operation cs sk 0 1 2 3 4 5 6 7 8 9 10 30 31 di 0 0 x x x [b] command for resetting data in rda1-3 cs sk 0 1 2 3 4 5 6 7 8 60 61 62 63 di 1 1 x x x x 1 x 0 1 0 1 1 1 x 0 1 1 x 1 1 < note > in the case of executing command for r esetting data in rda1 - 3 , it is necessary to input the 64 clocks to sk - pin with keeping to forc e the h level signal to cs - pin. [ 3 ] register a ccess [a] command for reading the data in register(read-reg) cs sk 0 1 2 3 4 5 6 7 8 9 10 20 21 22 23 24 25 26 27 28 29 30 31 di do hi-z don't care ('0' or '1') d7 d6 d5 d4 d3 d2 d1 d0 hi-z 1 0 1 1 0 a2 a1 a0
asahi kasei [ AK2570 ] < ms 0115 - e - 00 > 2001/10 13 [b] command for writing the data in the register (write-reg) cs sk 0 1 2 3 4 5 6 7 8 9 10 20 21 22 23 24 25 26 27 28 29 30 31 di x register data --- rtmp = 8bits --- rda1 = 8bits --- rda2 = 8bits --- rda3 = 8bits --- rint = 5bits --- rvpd = 8bits --- ratrm = 5bits 1 1 0 0 1 1 0 0 1 0 1 0 0 1 0 0 0 0 x d7 d6 1 1 0 x a2 a1 a0 1 a2 a1 a0 1 1 1 0 d0 x x x x d2 d1 d5 d4 d3 [4] eeprom a ccess [a] command for enabling/prohibiting to write the data in the eeprom (ewen/ewds) cs sk 0 1 2 3 4 5 6 7 8 9 10 20 21 22 23 24 25 26 27 28 29 30 31 di x --- ewds command --- ewen command x 0 x x x x x 0 a9 a8 1 1 x x a7 x 1 1 0 1 x x x x a7 0 1 a9 a8 0 0 [b] command for writing the data in the eeprom (write-eep) cs sk 0 1 2 3 4 5 6 7 8 9 10 14 15 16 17 18 28 29 30 31 di a1 d3 do hi-z te/w d0 0 d2 d1 1 x a8 a7 0 1 1 1 d15 d14 d13 a0 a6 a5 [c] command for reading the data in the eeprom (read-eep) cs sk 0 1 2 3 4 5 6 7 8 9 10 14 15 16 17 18 28 29 30 31 di a1 do h -z d13 hi-z d15 d14 d3 d2 d1 d0 1 0 x a8 a7 0 1 a0 a6 a5 1 1
asahi kasei [ AK2570 ] < ms 0115 - e - 00 > 2001/10 14 3. thermo - sensor ( t - sense ) kindly see the figure below that shows the relationship between the detected ambient tempera ture ( t ) and the generated output voltage (vt) in the t - sense . [ note ] in self - operation mode , it is the unique case that the data 1111 1111 generated by ad2 is converted to 1111 11110 automatical ly and the eeprom data in the address 1 1111 110x is used as the compensation data , this is the reason why that the eeprom which address is 1 1111 111x retains the reserved data and the trimming data for the t - sense and the almout. vt is 2.2v ( t yp.) at - 40 c and 0.0v at 85 c above and has the distribution due to each lsi. however it is possible to cancel the d istributed offset voltage arising in the t - sense among lsis by setting the data ( d4 ~ d0 ) in rint register. the offset cancel voltage ( r eference) correspond ing to the data ( d4 ~ d0 ) in rint register is shown in the table below . rint register d4 d3 d2 d1 d0 offset cancel voltage [ mv ] ( r eference 1 1 1 1 1 1 1 1 1 0 1 1 1 0 1 1 1 1 0 0 | 1 0 0 0 1 1 0 0 0 0 0 1 1 1 1 | 0 0 0 1 1 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 +375 +350 +325 +300 | + 25 0 - 25 | - 325 - 350 - 375 - 400 2.2 output voltage vt [v] 0.0 -40 +85 ambient temperature t[ c] offset voltage encoded data in ad2 0000 0000 0000 0001 0000 0010 1111 1111 1111 1110 1111 1101 1111 1100 0000 0011 1000 0000 1000 0001 0111 1111 -->1111 1110 note
asahi kasei [ AK2570 ] < ms 0115 - e - 00 > 2001/10 15 *set up for the rint register the offset voltage arising in the t - sense is slightly different and has the distribution among the lsis . please adjust that the d ata in rtmp reg ister exist s between the minimum code and the maximum code shown in this table at the minimum ambient temperature for the use with writing the data in rint registe r in training mode , and refer to r ecommend ed s equence in training mode in p. 7 . minimum ambient temperature for the use minimum code maximum code 0 c 01000010 01001000 - 20 c 00100010 00101000 - 30 c 00010010 00011000 - 40 c 00000010 00001000 in the case of fitting at + 25 c (reference) 01100110 01101100 1lsb of ad2 ou tput data (8bits) is 8.63mv ( t yp . . the refore 6codes is 51.8mv ( t yp. ) corresponding to the range between minimum code and maximum code shown in above table. on the other hand, the step of the offset cancel voltage is 25mv ( t yp.) and it is possible to adjust the output volt age of the t - snese in the range of minimum code and maximum code . after this offset voltage adjustment, th e output voltage from the t - sense becomes appr opriate f or the ad2 input range at every ambient temperature ( - 40 c ~ +85 c ) . also the minimum code and the maximum code for this adjustment in crease 16 codes/10 c . 4. d to a converter (da1 and da2) in the normal operation, forc ing the l level signal to shutdn - pin makes that daout1 ( the output of da1 + amp1 ) and daout2 ( the output of da2 + amp 2) utput the voltage corresponding to the data in rda 1 and rda2 register s . on the other hand, forc ing the h level signal to shutdn - pin makes that daout1 and daout2 output 0v ( m in. ) . also the data in rda1 and rda2 register s do es not change and is held while forc ing shut down signal ( the h level) . by forc ing the l lev el signal to shutdn - pin again, daout1 and daout2 o utput the signal corresponding the continuously held data in rda1 and rda2 regist er s . 5 . alarm circuit (da3, almout, comparat o r and alm timing generator ) i) mode setting the a larm circuit has the 3 modes ( the c ontinuous mode, the 156mbps burst transmission mode and the 50mbps burst transmission mode ) . each mode is set by the signals forced to almmod0 - pin and almmod1 - pin. almmod1 almmod0 mode 0 0 the c ontinuous mode 0 1 the 50mbps burst transmission mode 1 0 the 156mbps burst transmission mode 1 1 prohibited
asahi kasei [ AK2570 ] < ms 0115 - e - 00 > 2001/10 16 ii ) continuous mode the alarm circuit compares the input voltage to vpdin - pin (the monitoring pd signal) and the output voltage from da3 (the alarm threshold level ). the data for the alarm threshold level is retained in the eeprom (eda3), transfer red to rda3 and converted d to a signal in da3. at any time, t he h level a larm signal can be generated and outputted from alm - pin in the case that the input voltage to vpdin - pin becomes lower than the output voltage of da3. iii) 50mbps burst transm ission mode and 156mbps burst transmission mod e the alarm circuit compar es the input voltage to vpdin - pin (the monitoring pd signal) and the output voltage from da3 ( the alarm threshold level ) . the data for the alarm thr eshold level is retain ed in the eeprom (eda3) , transferred to rda3 and converted d to a signal in da3. the a larm circuit detects the pola rity of the input signal to envin - pin at the constant timing (the detecting point) from the rising edge ( l h ) of this signal . the a larm circuit outputs the alarm signal ( the h level) from alm - pin in the case that the input voltage to vpdin - pin is lower than the output voltage from da3 and envin signal is still kep t at the h level . also the alarm circuit detects the rising edge of the envin signal a nd fixes th e constant tim ing to output the a larm signal . in t h e case that vpdin signal recovers and becomes higher than the alarm threshold level at the detecting point with envin = h or that the envin signal becomes the l level, the alarm circuit output s the l level (the normal signal ) from alm - pin . * in the case of o utput ting the alarm signal continuously outputting the alarm signal envin alm the fixed timing of * in the case of s topping the alarm signal (the vpdin signal recovers) envin alm the vpdin signal recovers the fixed timing of outputting the alarm signal
asahi kasei [ AK2570 ] < ms 0115 - e - 00 > 2001/10 17 a bsolute m aximum r ating parameter symbol m in . m ax . unit remark power supply voltage vdd - 0.3 6.0 v dvdd - pin, avdd - pin ground level vss 0.0 0.0 v dvss - pin, avss - pin digital input voltage vdin - 0.3 vdd + 0.3 v analog input voltage vain - 0.3 vdd + 0.3 v input current iin - 10 10 ma except the pins above storage tem perature t stg - 5 5 + 125 c < note > AK2570 may operate abnormally and be broken under the condition exceeding the range shown above . r ecommended o perating c ondition a km can assure the characteristics of AK2570 specified in this data sheet under the condition as below. parameter symbol m in . t yp . m a x. unit remark vdd 2.97 3.30 3.63 v power supply voltage vss 0.0 0.0 0.0 v ambient temperature for operation ta - 40 85 c
asahi kasei [ AK2570 ] < ms 0115 - e - 00 > 2001/10 18 e lectrical c haracteristics ( 1) power consumption parameter symbol min . t yp . m ax . unit remark consumpti ve current idd 30 ma < note > the consumptive current which does not include the driving curr ent for the outputs is measured under the c ondition that the digital input pins are connected to vss or vdd. (2) eeprom characteristics parameter min. typ. max. u nit remark eepr om total writing times 1000 0 time eeprom data rete n tion 1 10 year 85 c eeprom data rete n tion 2 300 year 50 c ( r eference) (3) digital part [a] dc cha racteristics parameter symbol condition min. typ . max. unit input higher voltage vih 0.7 vdd vdd v input lower voltage vil vss 0.3 vdd v input higher current iih vih = vdd 10 m a input lower current iil vil = 0v - 10 m a output higher voltage voh ioh = - 0.2ma 0.9 vdd v output lower voltage vol iol = 0.2ma 0.1 vdd v [b] ac characteristics parameter symbol condition min. typ. max. unit tskp wh ile a / d conversion 10 m s sk : p eriod tskp w hile other operation 2 m s sk : p ulse duty tskw 40 60 % delay time : cs = h to s k = h [ * ] tcss 150 ns delay time : sk = l to cs = l tcsh 0 ns t ime for setting up the data t dis 200 ns time for holding the d at a t dih 200 ns delay time for the output tpd cl = 100pf 1 m s time to write in the eeprom t e/ w 10 ms cs : m inimum time in the l level t cs 250 ns delay time : cs = l to do = hi - z t oz 100 ns [*] it is necessary to force the l level to sk - pin at the rising edge of the cs s ignal and to apply the clock to s k - pi n at 150ms ec or more after this rising edge of the cs signal .
asahi kasei [ AK2570 ] < ms 0115 - e - 00 > 2001/10 19 digital part C a c characteristics : timing [1] timing for the command input cs sk di do tcss tskw tskp tdis tdih tskw high-z [2] timing for the data output cs sk di do tpd tpd tpd toz tcsh high-z d0 d1 d2 d3 [3] timing for writing the data in the eeprom cs sk di do high-z tdis tdih tcsh tcs te/w d0 d1
asahi kasei [ AK2570 ] < ms 0115 - e - 00 > 2001/10 20 (4) analog part [a] input characteristics of the a to d converter <1> ad1 resolution 8bit s linear conversion time about 150 m s or 15 sk clocks dnl 2lsb input range 1 (peak v ol t age) 0.0v ~ 1.0v [ t yp] msb lsb input voltage d7 d6 d5 d4 d3 d2 d1 d0 1 1 1 1 1 1 1 1 1.0v 1 1 1 1 1 1 1 0 ( straight binary ) 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0.0v <2> ad2 resolution 8bit s linear conversion time about 150 m s or 15 sk clocks dnl 0.7lsb input range 2 (temperature) 0.0v ~ 2.2v [ t yp.] msb lsb input voltage d7 d6 d5 d4 d3 d2 d1 d0 (detected temperature) 0 0 0 0 0 0 0 0 2.2v ( - 40 c ) 0 0 0 0 0 0 0 1 (straight binary) 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 0 0.0v (> 85 c ) [b] output characteristics of the a to d converter <1> da1, da2 parameter min. typ. max. unit remark resolution 8 bit circuit design dnl - 1 / 2 + 1 / 2 lsb maximum output voltage 0.425 0.500 0.575 v 15 % minimum output voltage 0 .0 1 0 .0 mv output voltage at the shut down operation 0.000 5.000 mv shutdn - pin is forced h 5% in cluded in the range 15% is the distribution caused by the fluctuations of the power source voltage and the ambient temperature.
asahi kasei [ AK2570 ] < ms 0115 - e - 00 > 2001/10 21 <2> t he over shoot voltage of da1 and da2 at relieving the shut down operation input data for da1 and da2 min . typ . max . unit remark 11111111 1111111 0 | 0000 1001 0000100 0 output voltage 1.2 m v designed guarantee value 00000111 0000011 0 | 00000001 00000000 13.0 ( stabilized in 120 m s ) mv designed guarantee value <3> da3 min. typ. max. unit remark resolution 8 bit circuit design voltage step by 1 code 3.92 mv designed guarantee value maximum output voltage 1.00 v designed guarantee value minimum output voltage 0.00 mv designed guarantee value <4> relationship between the input dig ital code and the o utput voltage d to a converter digital code output voltage (typ.) 11111111 500mv | | 00000001 1.96mv da1 00000000 0.0v 11111111 500mv | | 00000001 1.96mv da2 00000000 0.0v 11111111 1.0v | | 00000001 3.92mv da3 00000000 0.0v
asahi kasei [ AK2570 ] < ms 0115 - e - 00 > 2001/10 22 [c] output characteristics of the alarm signal <1> continuous mode parameter symbol condition min. typ. max. units delay time of alm signal tdly da3 output =0.5v vpdin=2.0v 0v 100 ns tdly alm vpdin da3 output <2> 50mbps bur st transmission mode parameter symbol condition min. typ. max. unit start time for detecting env signal tenvdt1 463.0 ns t otal t ime for detecting env signal tenvdt2 617.3 ns time for detecting env signal tenvdt 154.3 ns time for confirming vpd in signal tvin 212.2 ns time for output ting alm signal talmo cl = 20pf 463.0 771.6 ns [*] the condition of measuring for the time for outputting alm signal is that the input voltage to vpdin - pin is 0.0v (constant) . tenvdt1 tenvdt2 tenvdt tvin talmo clk envin vpdin alm (51.84mhz) the clock ( 51. 84mhz) is not applied to AK2570 . <3> 156mbps burst transmission mode parameter symbol condition min. typ. max. unit start time for detecting env signal tenvdt1 167.2 ns total time for detecting env signal tenvdt2 218.8 ns time fo r detecting env signal tenvdt 51.4 ns time for confirming vpdin signal tvin 64.3 ns time for outputting alm signal talmo cl=20pf 167.2 372.9 ns [*] the condition of measuring for the time for outputting alm signal is that the input voltage to
asahi kasei [ AK2570 ] < ms 0115 - e - 00 > 2001/10 23 vp din - pin is 0.0v (constant). tenvdt1 tenvdt2 tenvdt tvin talmo clk envin vpdin alm (155.52mhz) the clock (155.52mhz) is not applied to AK2570. delay time between the falling e dge of env in and that of alm in the 50mbps burst transmission mode and the 156mbps burst transmission mode, the alm signal become s the l level in the case of that the alm signal is still generated (at the h level) and the l level signal is forced to envin - pin (env signal) . there is the delay time between the falling edge of the env signal and that of the alm signal in this case . parameter symbol condition min. typ. max. unit delay time between the falling edge of env in and that of alm talmdl cl = 20p f 19.3 ns talmdl envin alm error on the judgment for alm signal there is some error on the judgment for generating the alarm signal . t herefore alm signal will be often generated in the case that the input voltage to vpdin - pin is slightly b igger than the da3 output (the alarm threshold level). the error shown below is the value against the da3 output. da3 output ( typ .) error on the judgment for alm signal [*] remarks 58.8mv 3db designed r eference value 98.0mv 2db designed reference v alue [ * ] db = the converted value for the power
asahi kasei [ AK2570 ] < ms 0115 - e - 00 > 2001/10 24 recommended external circuit [1] bias - pin for the reference voltage kindly connect the resistance ( the 1% accuracy) between bias - pin and avss with the line pattern as short as possible. r = 75k 1 bias(#2) AK2570 avss [2] power pins kindly insert the capacitor as shown below between d vdd - d vss and avdd - avss. c = 0.1 f avss(#8) AK2570 avdd(#7) [dvdd(#17)] [dvss(#16)]
asahi kasei [ AK2570 ] < ms 0115 - e - 00 > 2001/10 25 [a] the example s of the external circuit for daout1 - pin / fb1 - pin and daout 2 - pin / fb 2 - pin are shown below in the case of the use at the direct variation for the ld . <1> example [1 ] fb1(#3) AK2570 daout1(#4) daout2(#6) fb2(#5) ld driver circuit <2> example [2] fb1(#3) AK2570 daout1(#4) daout2(#6) fb2(#5) ld driver lsi voltage for the bias current voltage for the modulation current [b] the example of the external circuit for vpdin - pin is shown below . AK2570 vpdin(#9) pd e xample for e xternal c ircui t
asahi kasei [ AK2570 ] < ms 0115 - e - 00 > 2001/10 26 p ackage package type : 20 pin - ssop marking on the surface of the package : (1) index : indicating pin #1 (2) company n ame : akm (3) product no. : AK2570 (4) date c ode : xxxxxxx ( 7 figures) package s ize : 0 ~ 10 0 . 2 2 0 . 0 5 7 . 9 0 0 . 2 0 0 . 6 0 . 2 2 . 1 0 m a x 0 . 1 0 0 . 1 0 7.4max 5 . 3 t y p 1 10 20 11 0.65 0.32 0.10 7.2typ akm AK2570 xxxxxxx 0.10 m 0.13
asahi kasei [ AK2570 ] < ms 0115 - e - 00 > 2001/10 27 i m portant notice these products and their specifications are subject to change without notice. before considering any use or application, consult the asahi kasei microsystems co., ltd. (akm) sales office or authorized distributor concerning their current status. akm assumes no liability for infringement of any patent, intellectual property, or other right in the application or use of any i nformation contained herein. any export of these products, or devices or systems containing them, may require an export license or other official approval under the law and regulations of the country of export pertaining to customs and tariffs, currency exchange, or strategic materials. akm products are neither intended nor authorized for use as critical components in any safety, life support, or other hazard related device or system, and akm assumes no responsibility relating to any such use, except wi th the express written consent of the representative director of akm. as used here: (a) a hazard related device or system is one designed or intended for life support or maintenance of safety or for applications in medicine, aerospace, nuclear energy, or other fields, in which its failure to function or perform may reasonably be expected to result in loss of life or in significant injury or damage to person or property. (b) a critical component is one whose failure to function or perform may reasonably be expected to result, whether directly or indirectly, in the loss of the safety or effectiveness of the device or system containing it, and which must therefore meet very high standards of performance and reliability. it is the responsibility of the buyer or distributor of an akm product who distributes, disposes of, or otherwise places the product with a third party to notify that party in advance of the above content and conditions, and the buyer or distributor agrees to assume any and all responsibility and liability for and hold akm harmless from any and all claims arising from the use of said product in the absence of such notification.

▲Up To Search▲

Price & Availability of AK2570

	To Download AK2570 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .