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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. r1120 a www.rohm.com ? 2011 rohm co., ltd. all rights reserved. notice rohm customer support system http://www.rohm.com/contact/ thank you for your accessing to rohm product informations. more detail product informations and catalogs are available, please contact us. notes no copying or reproduction of this document, in part or in whole, is permitted without the consent of rohm co.,ltd. the content specified herein is subject to change for improvement without notice. the content specified herein is for the purpose of introducing rohm's products (hereinafter "products"). if you wish to use any such product, please be sure to refer to the specifications, which can be obtained from rohm upon request. examples of application circuits, circuit constants and any other information contained herein illustrate the standard usage and operations of the products. the peripheral conditions must be taken into account when designing circuits for mass production. great care was taken in ensuring the accuracy of the information specified in this document. however, should you incur any damage arising from any inaccuracy or misprint of such information, rohm shall bear no responsibility for such damage. the technical information specified herein is intended only to show the typical functions of and examples of application circuits for the produc ts. rohm does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by rohm and other parties. rohm shall bear no responsibility whatsoever for any dispute arising from the use of such technical information. the products specified in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, office-automation equipment, commu- nication devices, electronic appliances and amusement devices). the products specified in this document are not designed to be radiation tolerant. while rohm always makes efforts to enhance the quality and reliability of its products, a product may fail or malfunction for a variety of reasons. please be sure to implement in your equipment using the products safety measures to guard against the possibility of physical injury, fire or any other damage caused in the event of the failure of any product, such as derating, redundancy, fire control and fail-safe designs. rohm shall bear no responsibility whatsoever for your use of any product outside of the prescribed scope or not in accordance with the instruction manual. the products are not designed or manufactured to be used with any equipment, device or system which requires an extremely high level of reliability the failure or malfunction of which may result in a direct threat to human life or create a risk of human injury (such as a medical instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuel- controller or other safety device). rohm shall bear no responsibility in any way for use of any of the products for the above special purposes. if a product is intended to be used for any such special purpose, please contact a rohm sales representative before purchasing. if you intend to export or ship overseas any product or technology specified herein that may be controlled under the foreign exchange and the foreign trade law, you will be required to obtain a license or permit under the law. |
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