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| 1/21 www.rohm.com 2011.03 - rev.a ? 2011 rohm co., ltd. all rights reserved. high reliability serial eeproms i 2 c bus br24family br24t series description br24t - w series is a serial eeprom of i 2 c bus interface method features 1) completely conforming to the world standard i 2 c bus. all controls available by 2 ports of serial clock (scl) and serial data(sda) 2) other devices than eeprom can be connected to the same port, saving microcontroller port 3) 1.7v 5.5v single power source action most suitable for battery use 4) 1.7v 5.5vwide limit of action voltage, possible fast mode 400khz action 5) page write mode useful for initia l value write at factory shipment 6) auto erase and auto end function at data write 7) low current consumption 8) write mistake prevention function write (write protect) function added write mistake prevention function at low voltage 9) dip-t8/sop8/sop-j8/ssop-b8/tssop-b8/t ssop-b8j/msop8/vson008x2030 various packages 10) data rewrite up to 1,000,000 times 11) data kept for 40 years 12) noise filter built in scl / sda terminal 13) shipment data all address ffh br24t series capacity bit format type power source voltage dip-t8 sop8 sop-j8 ssop-b8 tssop-b8 tssop-b8j msop8 vson008 x2030 1kbit 1288 br24t01-w 1.7 5.5v 2kbit 2568 br24t02-w 1.7 5.5v 4kbit 5128 br24t04-w 1.7 5.5v 8kbit 1k8 BR24T08-W 1.7 5.5v 16kbit 2k8 br24t16-w 1.7 5.5v 32kbit 4k8 br24t32-w 1.7 5.5v 64kbit 8k8 br24t64-w 1.7 5.5v 128kbit 16k8 br24t128-w 1.7 5.5v 256kbit 32k8 br24t256-w 1.7 5.5v 512kbit 64k8 br24t512-w 1.7 5.5v 1024kbit 128k8 br24t1m-w 1.7 5.5v : developing no.11001eat21
technical note 2/21 br24t series www.rohm.com 2011.03 - rev.a ? 2011 rohm co., ltd. all rights reserved. absolute maximum ratings (ta=25 memory cell characteristics (ta=25 \ recommended operating conditions parameter symbol ratings unit power source voltage vcc 1.7 electrical characteristics ( unless otherwise specified, ta= QQ Q ? ? technical note 3/21 br24t series www.rohm.com 2011.03 - rev.a ? 2011 rohm co., ltd. all rights reserved. action timing characteristics (unless otherwise specified, ta= Q sync data input / output timing start condition stop condition write data start condition stop condition stop condition technical note 4/21 br24t series www.rohm.com 2011.03 - rev.a ? 2011 rohm co., ltd. all rights reserved. block diagram pin assignment and description terminal name input/ output br24t01-w br24t02-w br24t 04-w BR24T08-W br24t16-w br24t32/64/ 128/256/512-w br24t1m-w a0 input slave address setting don?t use* characteristic data (the following values are typ. ones.) 0 1 2 3 4 5 6 0123456 supply voltage : vcc(v) h input voltage : v ih1 (v) 0 0.2 0.4 0.6 0.8 1 1.2 0123456 supplyvoltage : vcc(v) input leak current : i li (ua) 0 0.2 0.4 0.6 0.8 1 0123456 l output current : i ol (ma) l output voltage : v ol2 (v) 0 0.2 0.4 0.6 0.8 1 1.2 0123456 supply voltage : vcc(v) output leak current : i lo (ua) 0 0.2 0.4 0.6 0.8 1 0123456 l output current : i ol (ma) l output voltage : v ol1 (v) 0 1 2 3 4 5 6 0123456 supply voltage : vcc(v) l input voltage : v il1 (v) ta=-40 ta=25 ta=85 ta=-40 ta=25 ta=85 ta=-40 ta=25 ta=85 ta=-40 ta=25 ta=85 ta=-40 ta=25 ta=85 ta=-40 ta=25 ta=85 spec spec spec spec spec spec *1 *2 *2 *2 technical note 5/21 br24t series www.rohm.com 2011.03 - rev.a ? 2011 rohm co., ltd. all rights reserved. characteristic data (the following values are typ. ones.) 0 0.5 1 1.5 2 2.5 3 3.5 0123456 supply voltage : vcc(v) current consumption at writing : icc1(ma) 0 0.5 1 1.5 2 2.5 0123456 supply voltage : vcc(v) stanby current : i sb (ua) -0.1 0.1 0.3 0.5 0.7 0.9 1.1 0123456 supply voltage : vcc(v) start condition set up time : tsu:sta(us) 0.1 1 10 100 1000 10000 0123456 supply voltage : vcc(v) scl frequency : f?h z -200 -150 -100 -50 0 50 0123456 supply voltage : vcc(v) input data hold time : t hd: sta (ns) 0 0.2 0.4 0.6 0.8 1 0123456 supply voltage : vcc(v) data clk h time : t high (us) 0 0.5 1 1.5 2 2.5 0123456 supply voltage : vcc(v) current consumption at writing : icc1(ma) high 0 0.3 0.6 0.9 1.2 1.5 0123456 supply voltage : vccv clk l time : t low (us) 0 0.2 0.4 0.6 0.8 1 0123456 supply voltage : vcc(v) start condition hold time : t hd : sta (us) high hd : dat (low su: dat (high) -200 -150 -100 -50 0 50 0123456 supply voltage : vcc(v) input data hold time : t hd :dat (ns) -200 -100 0 100 200 300 0123456 supply voltage : vcc(v) input data set up time : t su: dat (ns) 0 1 2 3 4 5 6 0123456 supply voltage : vcc(v) current consumption at writing : icc1(ma) 0 0.1 0.2 0.3 0.4 0.5 0.6 0123456 supply voltage : vcc(v) current consumption at reading : icc2(ma) 0 0.1 0.2 0.3 0.4 0.5 0.6 0123456 supply voltage : vcc(v) current consumption at reading : icc2(ma) 0 0.5 1 1.5 2 2.5 0123456 supply voltage : vcc(v) stanby current : i sb (ua) ta=-40 ta=25 ta=85 ta=-40 ta=25 ta=85 ta=-40 ta=25 ta=85 ta=-40 ta=25 ta=85 ta=-40 ta=25 ta=85 ta=-40 ta=25 ta=85 ta=-40 ta=25 ta=85 ta=-40 ta=25 ta=85 ta=-40 ta=25 ta=85 ta=-40 ta=25 ta=85 ta=-40 ta=25 ta=85 ta=-40 ta=25 ta=85 spec spec spec spec spec spec spec spec spec spec spec spec the plan for inserting data. (br24t512/1m-w) the plan for inserting data. (br24t512/1m-w) the plan for inserting data. (br24t512/1m-w) technical note 6/21 br24t series www.rohm.com 2011.03 - rev.a ? 2011 rohm co., ltd. all rights reserved. characteristic data (the following values are typ. ones.) 0 0.5 1 1.5 2 0123456 supply voltage : vcc(v) bus open time before transmission : t buf (us) 0 1 2 3 4 5 6 0123456 supply voltage : vcc(v) internal writing cycle time : t wr (ms) -200 -100 0 100 200 300 0123456 supply voltage : vcc(v) input data set up time : t su : dat (ns) 0.0 0.5 1.0 1.5 2.0 0123456 supply voltage : vcc(v) output data delay time : t pd (us) fig.25 l t pd 0 pd 1 buf wr 0 0.1 0.2 0.3 0.4 0.5 0.6 0123456 supply voltage : vcc(v) noise reduction efective time : t l (scl h) (us) t l scl h t l scl l 0 0.1 0.2 0.3 0.4 0.5 0.6 0123456 supply voltage : vcc(v) noise reduction efective time : t l (scl l)(us) sda h 0 0.1 0.2 0.3 0.4 0.5 0.6 0123456 supply volatge : vcc(v) noise reduction efective time : t l (sda h)(us) 0 0.1 0.2 0.3 0.4 0.5 0.6 0123456 supply voltage : vcc(v) noise reduction effective time : t l (sad l)(us) t su : wp -0.6 -0.5 -0.4 -0.3 -0.2 -0.1 0.0 0.1 0.2 0123456 supply voltage : vcc(v) wp set up time : t su : wp (us) t high : wp 0.0 0.2 0.4 0.6 0.8 1.0 1.2 0123456 supplyvoltage : vcc(v) wp effective time : t high : wp (us) ta=-40 ta=25 ta=85 ta=-40 ta=25 ta=85 ta=-40 ta=25 ta=85 ta=-40 ta=25 ta=85 ta=-40 ta=25 ta=85 ta=-40 ta=25 ta=85 ta=-40 ta=25 ta=85 ta=-40 ta=25 ta=85 ta=-40 ta=25 ta=85 spec spec spec spec spec spec spec spec spec spec 0.0 0.5 1.0 1.5 2.0 0123456 supply voltage : vcc(v) output data delay time : t pd (us) spec spec -0.5 0.0 0.5 1.0 1.5 2.0 0123456 supply voltage : vcc(v) stop condition setup time : t su :sto(us) 0.0 0.2 0.4 0.6 0.8 1.0 1.2 0123456 supplyvoltage : vcc(v) wp data hold time : t hd : wp (us) su ta=-40 ta=25 ta=85 ta=-40 ta=25 ta=85 spec spec ta=-40 ta=25 ta=85 spec ta=-40 ta=25 ta=85 technical note 7/21 br24t series www.rohm.com 2011.03 - rev.a ? 2011 rohm co., ltd. all rights reserved. i 2 c bus communication ? ? ? ? ? ? ? ? ? ? ? ? DD DD DD DD DD DD technical note 8/21 br24t series www.rohm.com 2011.03 - rev.a ? 2011 rohm co., ltd. all rights reserved. write command ? ? ? technical note 9/21 br24t series www.rohm.com 2011.03 - rev.a ? 2011 rohm co., ltd. all rights reserved. ? ? ? ? ? ? ? ? ? ? ? technical note 10/21 br24t series www.rohm.com 2011.03 - rev.a ? 2011 rohm co., ltd. all rights reserved. ? ??? ??? wa7 wa4 wa3 wa2 wa1 wa0 0 00000 0 00001 0 00010 0 01110 0 01111 0 00000 increment 0eh significant bit is fixed. no digit up technical note 11/21 br24t series www.rohm.com 2011.03 - rev.a ? 2011 rohm co., ltd. all rights reserved. read command ? ? ? ? ? ? fig.43 random read cycle (br24t01/02/04/08/16-w) fig.44 random read cycle (br 24t32/64/128/25 6/512/1m-w) *1 a2 a0 a1 a1 a2 w r i t e s t a r t r / w a c k s t o p 1st word address a0 d7 d0 2nd word address(n) a c k s t a r t slave address 1 0 0 1 r / w r e a d wa 0 note) *1 wa 15 wa 14 wa 13 wa 12 wa 11 *1 technical note 12/21 br24t series www.rohm.com 2011.03 - rev.a ? 2011 rohm co., ltd. all rights reserved. software reset software reset is executed when to avoid malfunction after po wer on, and to reset during command input. software reset has several kinds, and 3 kinds of them are shown in the figure below. (refer to fig.48-(a), fig.48-(b), fig.48-(c).) in dummy clock input area, release the sda bus ('h' by pull up) . in dummy clock area, ack output and read data '0' (both 'l' level) may be output from eeprom, therefor e, if 'h' is input forcibly, output may conflict and over current may flow, leading to instantaneous power failure of system power source or influence upon devices. acknowledge polling during internal write execution, all input commands are ignored , therefore ack is not sent back. during internal automatic write execution after write cycle input, next command (slave addre ss) is sent, and if the first ack signal sends back 'l', then it means end of write action, while if it sends back 'h', it means now in writin g. by use of acknowledge polling, next command can be executed without waiting for twr = 5ms. when to write continuously, w/r = 0, when to carry out current read cycle after write, slave address w/r = 1 is sent, and if ack signal sends back 'l', then execute wo rd address input and data output and so forth. 1 2 13 14 scl dummy clock14 start2 scl fig.48-(a) technical note 13/21 br24t series www.rohm.com 2011.03 - rev.a ? 2011 rohm co., ltd. all rights reserved. wp valid timing (write cancel) wp is usually fixed to 'h' or 'l', but when wp is used to canc el write cycle and so forth, pay attention to the following wp valid timing. during write cycle execution, in cancel valid area, by setting wp='h', write cycle can be cancelled. in both byte write cycle and page write cycle, the area from the first start condition of command to the rise of clock to taken in d0 of data(in page write cycle, the first byte data) is cancel invalid area. wp input in this area becomes don't care. the area from the rise of scl to take in d0 to i nput the stop condition is cancel valid area. and, after execution of forced end by wp, standby status gets in. command cancel by start condition and stop condition during command input, by continuously inputting start condit ion and stop condition, command can be cancelled. (fig.51) however, in ack output area and during data read, sda bus ma y output 'l', and in this case, start condition and stop condition cannot be input, so reset is not available. therefore, execute software reset. and when command is cancelled by start, stop condition, during random read cycle, sequential read cycle, or current read cycle, internal setting address is not determined, therefore, it is not possible to carry out curre nt read cycle in succession. when to carry out read cycle in succession, carry out random read cycle. ? ? technical note 14/21 br24t series www.rohm.com 2011.03 - rev.a ? 2011 rohm co., ltd. all rights reserved. i/o peripheral circuit ? ?? ? ? ??? ? ? ? ? ? ? ? Q ? ? ? ? ? ? ? technical note 15/21 br24t series www.rohm.com 2011.03 - rev.a ? 2011 rohm co., ltd. all rights reserved. cautions on microcontroller connection ? ? ??? ? ? ? ? ? ? ? ?? ex) ?? ??? ???? ? ? ? ? ? ? ? ? ? technical note 16/21 br24t series www.rohm.com 2011.03 - rev.a ? 2011 rohm co., ltd. all rights reserved. i 2 c bus input / output circuit technical note 17/21 br24t series www.rohm.com 2011.03 - rev.a ? 2011 rohm co., ltd. all rights reserved. notes on power on at power on, in ic internal circuit and set, vcc rises through unstable low voltage area, and ic inside is not completely reset , and malfunction may occur. to prevent this, functions of po r circuit and lvcc circuit are equipped. to assure the action, observe the following conditions at power on. 1. set sda = 'h' and scl ='l' or 'h? 2. start power source so as to satisfy the recommended conditions of t r , t off , and vbot for operating por circuit. low voltage malfunction prevention function lvcc circuit prevents data rewrite action at low power, and prevents wrong write. at lvcc voltage (typ. =1.2v) or below, it prevent data rewrite. vcc noise countermeasures technical note 18/21 br24t series www.rohm.com 2011.03 - rev.a ? 2011 rohm co., ltd. all rights reserved. notes for use (1) described numeric values and data are design repr esentative values, and the values are not guaranteed. (2) we believe that application circuit examples are recommendabl e, however, in actual use, confirm characteristics further sufficiently. in the case of use by changing the fixed number of external parts, make your decision with sufficient margin in consideration of static characterist ics and transition characteristics and fluc tuations of external parts and our lsi. (3) absolute maximum ratings if the absolute maximum ratings such as impressed voltage and action temperature range and so forth are exceeded, lsi may be destructed. do not impress voltage and temperat ure exceeding the absolute maximum ratings. in the case of fear exceeding the absolute maximum ratings, take physica l safety countermeasures such as fuses, and see to it that conditions exceeding the absolute maximum ratings should not be impressed to lsi. (4) gnd electric potential set the voltage of gnd terminal lowest at any action condition. make sure that each terminal voltage is lower than that of gnd terminal. (5) terminal design in consideration of permissible loss in actual use cond ition, carry out heat design with sufficient margin. (6) terminal to terminal shortcircuit and wrong packaging when to package lsi onto a board, pay sufficient attentio n to lsi direction and displacement. wrong packaging may destruct lsi. and in the case of shortcircuit between lsi terminals and terminals and power source, terminal and gnd owing to foreign matter, lsi may be destructed. (7) use in a strong electromagnetic field may cause malfunction, therefore, ev aluate design sufficiently. technical note 19/21 br24t series www.rohm.com 2011.03 - rev.a ? 2011 rohm co., ltd. all rights reserved. order part number b r 2 4 t 1 2 8 f v t - w g e 2 part no. bus type 24 ? order quantity needs to be multiple of the minimum quantity. technical note 20/21 br24t series www.rohm.com 2011.03 - rev.a ? 2011 rohm co., ltd. all rights reserved. direction of feed reel ? order quantity needs to be multiple of the minimum quantity. technical note 21/21 br24t -w series www.rohm.com 2011.03 - rev.a ? 2011 rohm co., ltd. all rights reserved. ? order quantity needs to be multiple of the minimum quantity. datasheet d a t a s h e e t notice - ge rev.002 ? 2014 rohm co., ltd. all rights reserved. notice precaution on using rohm products 1. our products are designed and manufac tured for application in ordinary elec tronic equipments (such as av equipment, oa equipment, telecommunication equipment, home electroni c appliances, amusement equipment, etc.). if you intend to use our products in devices requiring ex tremely high reliability (such as medical equipment (note 1) , transport equipment, traffic equipment, aircraft/spacecra ft, nuclear power controllers, fuel c ontrollers, car equipment including car accessories, safety devices, etc.) and whose malfunction or failure may cause loss of human life, bodily injury or serious damage to property (?specific applications?), please consult with the rohm sale s representative in advance. unless otherwise agreed in writing by rohm in advance, ro hm shall not be in any way responsible or liable for any damages, expenses or losses incurred by you or third parties arising from the use of any ro hm?s products for specific applications. (note1) medical equipment classification of the specific applications japan usa eu china class class class b class class class 2. rohm designs and manufactures its products subject to strict quality control system. however, semiconductor products can fail or malfunction at a certain rate. please be sure to implement, at your own responsibilities, adequate safety measures including but not limited to fail-safe desi gn against the physical injury, damage to any property, which a failure or malfunction of our products may cause. the following are examples of safety measures: [a] installation of protection circuits or other protective devices to improve system safety [b] installation of redundant circuits to reduce the impact of single or multiple circuit failure 3. our products are designed and manufactured for use under standard conditions and not under any special or extraordinary environments or conditio ns, as exemplified below. accordin gly, rohm shall not be in any way responsible or liable for any damages, expenses or losses arising from the use of an y rohm?s products under any special or extraordinary environments or conditions. if you intend to use our products under any special or extraordinary environments or conditions (as exemplified bel ow), your independent verification and confirmation of product performance, reliability, etc, prior to use, must be necessary: [a] use of our products in any types of liquid, incl uding water, oils, chemicals, and organic solvents [b] use of our products outdoors or in places where the products are exposed to direct sunlight or dust [c] use of our products in places where the products ar e exposed to sea wind or corrosive gases, including cl 2 , h 2 s, nh 3 , so 2 , and no 2 [d] use of our products in places where the products are exposed to static electricity or electromagnetic waves [e] use of our products in proximity to heat-producing components, plastic cords, or other flammable items [f] sealing or coating our products with resin or other coating materials [g] use of our products without cleaning residue of flux (ev en if you use no-clean type fluxes, cleaning residue of flux is recommended); or washing our products by using water or water-soluble cleaning agents for cleaning residue after soldering [h] use of the products in places subject to dew condensation 4. the products are not subjec t to radiation-proof design. 5. please verify and confirm characteristics of the final or mounted products in using the products. 6. in particular, if a transient load (a large amount of load applied in a short per iod of time, such as pulse. is applied, confirmation of performance characteristics after on-boar d mounting is strongly recomm ended. avoid applying power exceeding normal rated power; exceeding the power rating under steady-state loading c ondition may negatively affect product performance and reliability. 7. de-rate power dissipation (pd) depending on ambient temper ature (ta). when used in seal ed area, confirm the actual ambient temperature. 8. confirm that operation temperat ure is within the specified range descr ibed in the product specification. 9. rohm shall not be in any way responsible or liable for fa ilure induced under deviant condi tion from what is defined in this document. precaution for mounting / circuit board design 1. when a highly active halogenous (chlori ne, bromine, etc.) flux is used, the resi due of flux may negatively affect product performance and reliability. 2. in principle, the reflow soldering method must be used; if flow soldering met hod is preferred, please consult with the rohm representative in advance. for details, please refer to rohm mounting specification datasheet d a t a s h e e t notice - ge rev.002 ? 2014 rohm co., ltd. all rights reserved. precautions regarding application examples and external circuits 1. if change is made to the constant of an external circuit, pl ease allow a sufficient margin c onsidering variations of the characteristics of the products and external components, including transient characteri stics, as well as static characteristics. 2. you agree that application notes, re ference designs, and associated data and in formation contained in this document are presented only as guidance for products use. theref ore, in case you use such information, you are solely responsible for it and you must exercise your own independent verification and judgment in the use of such information contained in this document. rohm shall not be in any way responsible or liable for any damages, expenses or losses incurred by you or third parties arising from the use of such information. precaution for electrostatic this product is electrostatic sensitive product, which may be damaged due to electrostatic discharge. please take proper caution in your manufacturing process and storage so that voltage exceeding t he products maximum rating will not be applied to products. please take special care under dry condit ion (e.g. grounding of human body / equipment / solder iron, isolation from charged objects, se tting of ionizer, friction prevention and temperature / humidity control). precaution for storage / transportation 1. product performance and soldered connections may deteriora te if the products are stor ed in the places where: [a] the products are exposed to sea winds or corros ive gases, including cl2, h2s, nh3, so2, and no2 [b] the temperature or humidity exceeds those recommended by rohm [c] the products are exposed to di rect sunshine or condensation [d] the products are exposed to high electrostatic 2. even under rohm recommended storage c ondition, solderability of products out of recommended storage time period may be degraded. it is strongly recommended to confirm sol derability before using products of which storage time is exceeding the recommended storage time period. 3. store / transport cartons in the co rrect direction, which is indicated on a carton with a symbol. otherwise bent leads may occur due to excessive stress applied when dropping of a carton. 4. use products within the specified time after opening a hum idity barrier bag. baking is required before using products of which storage time is exceeding the recommended storage time period. precaution for product label qr code printed on rohm products label is for rohm?s internal use only. precaution for disposition when disposing products please dispose them proper ly using an authorized industry waste company. precaution for foreign exchange and foreign trade act since our products might fall under cont rolled goods prescribed by the applicable foreign exchange and foreign trade act, please consult with rohm representative in case of export. precaution regarding intellectual property rights 1. all information and data including but not limited to application example contain ed in this document is for reference only. rohm does not warrant that foregoi ng information or data will not infringe any intellectual property rights or any other rights of any third party regarding such information or data. rohm shall not be in any way responsible or liable for infringement of any intellectual property rights or ot her damages arising from use of such information or data.: 2. no license, expressly or implied, is granted hereby under any intellectual property rights or other rights of rohm or any third parties with respect to the information contained in this document. other precaution 1. this document may not be reprinted or reproduced, in whol e or in part, without prior written consent of rohm. 2. the products may not be disassembled, converted, modified, reproduced or otherwise changed without prior written consent of rohm. 3. in no event shall you use in any wa y whatsoever the products and the related technical information contained in the products or this document for any military purposes, incl uding but not limited to, the development of mass-destruction weapons. 4. the proper names of companies or products described in this document are trademarks or registered trademarks of rohm, its affiliated companies or third parties. datasheet datasheet notice ? we rev.001 ? 2014 rohm co., ltd. all rights reserved. general precaution 1. before you use our pro ducts, you are requested to care fully read this document and fully understand its contents. rohm shall n ot be in an y way responsible or liabl e for fa ilure, malfunction or acci dent arising from the use of a ny rohms products against warning, caution or note contained in this document. 2. all information contained in this docume nt is current as of the issuing date and subj ec t to change without any prior notice. before purchasing or using rohms products, please confirm the la test information with a rohm sale s representative. 3. the information contained in this doc ument is provi ded on an as is basis and rohm does not warrant that all information contained in this document is accurate an d/or error-free. rohm shall not be in an y way responsible or liable for an y damages, expenses or losses incurred b y you or third parties resulting from inaccur acy or errors of or concerning such information. |
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