High Reliability Series Serial EEPROM Series I2C BUS Serial EEPROMs BR24T□□□-W Series BR24T01-W, BR24T02-W, BR24T04-W,BR24T08-W, BR24T16-W, BR24T32-W, BR24T64-W, BR24T128-W, BR24T256-W,☆BR24T512-W,☆BR24T1M-W ☆:BR24T512/1M-W are model, the description matters are target all specifications because of the model under development. ROHM's series of serial EEPROMs represent the highest level of reliability on the market.
Technical Note BR24T□□□-W Series I2C BUS Serial EEPROMs BR24T□□□-W Series BR24T01-W, BR24T02-W, BR24T04-W, BR24T08-W, BR24T16-W, BR24T32-W, BR24T64-W, BR24T128-W, BR24T256-W, BR24T512-W, BR24T1M-W ●Description BR24T□□□-W series is a serial EEPROM of I2C BUS interface method ●Features ・ Completely conforming to the world standard I2C BUS.
Technical Note BR24T□□□-W Series ●Memory cell characteristics (Ta=25℃, Vcc=1.7～5.5V) ●Absolute maximum ratings (Ta=25℃) Parameter symbol Limits Unit Impressed voltage VCC -0.3～+6.5 V 800 (DIP-T8) *1 450 (SOP-J8) *3 Data hold years 300 (SSOP-B8) *4 Pd 330 (TSSOP-B8) Min. Number of data rewrite times *1 450 (SOP8) *2 Permissible dissipation Limits Parameter Typ.
Technical Note BR24T□□□-W Series ●Block diagram *2 1 A0 8 1Kbit～1024Kbit EEPROM array Vcc *1 8bit *2 *17bit 13bit 8bit 14bit 9bit 15bit 10bit 16bit 11bit 17bit 12bit Address decoder 2 A1 Word address register START *2 3 A2 Data register 7 WP STOP 6 Control circuit ＊ 1 Power source voltage detection High voltage generating circuit 4 7bit: BR24T01-W 8bit: BR24T02-W 9bit: BR24T04-W 10bit: BR24T08-W 11bit: BR24T16-W 5 12bit: BR24T32-W 13bit: BR24T64-W 14bit: BR24T128-W 15bit: BR2
Technical Note BR24T□□□-W Series ●Characteristic data (The following values are Typ. ones.) 3.5 2.5 6 3 2 5 SPEC Ta=-40℃ Ta=25℃ Ta=85℃ 1 0.5 2 1 2 3 4 5 Ta=-40℃ Ta=25℃ Ta=85℃ 1.5 1 0.5 0 0 0 CURRENT CONSUMPTION AT WRITING : Icc1(mA) 1.5 2.
Technical Note BR24T□□□-W Series 200 SPEC 100 0 Ta=-40℃ Ta=25℃ Ta=85℃ -100 -200 0 1 2 3 4 5 6 2.0 Ta=-40℃ Ta=25℃ Ta=85℃ 1.5 SPEC 1.0 0.5 0.0 0 1 SUPPLY VOLTAGE : Vcc(V) 5 6 Ta=-40℃ Ta=25℃ Ta=85℃ 0.5 5 4 3 2 Ta=-40℃ Ta=25℃ Ta=85℃ 1 0 0 0 1 2 3 4 5 0 6 1 SUPPLY VOLTAGE : Vcc(V) 2 3 4 5 6 0.2 SPEC 0 1 2 3 4 5 0.4 0.3 0.2 0.1 SPEC 0 0 1 SUPPLY VOLTAGE : Vcc(V) SPEC 0.00 -0.10 -0.20 -0.30 Ta=-40℃ Ta=25℃ Ta=85℃ -0.40 -0.50 -0.
Technical Note BR24T□□□-W Series ●I2C BUS communication ○I2C BUS data communication I2C BUS data communication starts by start condition input, and ends by stop condition input. Data is always 8bit long, and 2 acknowledge is always required after each byte. I C BUS carries out data transmission with plural devices connected by 2 communication lines of serial data (SDA) and serial clock (SCL).
Technical Note BR24T□□□-W Series ●Write Command ○Write cycle ・Arbitrary data is written to EEPROM. When to write only 1 byte, byte write is normally used, and when to write continuous data of 2 bytes or more, simultaneous write is possible by page write cycle. The maximum number of write bytes is specified per device of each capacity. p to 256 arbitrary bytes can be written.
Technical Note BR24T□□□-W Series ・ ・ As for page write cycle of BR24T512-W after the significant 9 bits of word address is designated arbitrarily, by continuing data input of 2 bytes or more, the address of insignificant 7 bits is incremented internally, and data up to 128 bytes can be written.
Technical Note BR24T□□□-W Series ○ Notes on write cycle continuous input At STOP(stop bit), write starts. S T A R T SDA LINE W R I T E SLAVE ADDRESS WORD ADDRESS（ｎ） WA 0 WA 7 1 0 1 0 P2 P1 P0 R A / C W K Note) *2 DATA(n+15) DATA(n) D7 D0 A C K *1 S T A R T S T O P D0 A C K 1 0 1 0 A C K Next command tWR (maximum : 5ms) Command is not accepted for this period Fig.38 Page write cycle (BR24T01/02/04/08/16-W) S T A R T SDA LINE At STOP (stop bit) write starts.
Technical Note BR24T□□□-W Series ●Read Command ○Read cycle Data of EEPROM is read. In read cycle, there are random read cycle and current read cycle. Random read cycle is a command to read data by designating address, and is used generally. Current read cycle is a command to read data of internal address register without designating address, and is used when to verify just after write cycle. In both the read cycles, sequential read cycle is available, and the next address data can be read in succession.
Technical Note BR24T□□□-W Series ●Software reset Software reset is executed when to avoid malfunction after power 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.45-(a), Fig.45-(b), Fig.45-(c).) In dummy clock input area, release the SDA bus ('H' by pull up).
Technical Note BR24T□□□-W Series ●WP valid timing (write cancel) WP is usually fixed to 'H' or 'L', but when WP is used to cancel 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.
Technical Note BR24T□□□-W Series ●I/O peripheral circuit ○Pull up resistance of SDA terminal SDA is NMOS open drain, so requires pull up resistance. As for this resistance value (RPU), select an appropriate value to this resistance value from microcontroller VIL, IL, and VOL-IOL characteristics of this IC. If RPU is large, action frequency is limited. The smaller the RPU, the larger the consumption current at action. ○Maximum value of RPU The maximum value of RPU is determined by the following factors.
Technical Note BR24T□□□-W Series ●A0, A1, A2, WP process ○Process of device address terminals (A0,A1,A2) Check whether the set device address coincides with device address input sent from the master side or not, and select one among plural devices connected to a same bus. Connect this terminal to pull up or pull down, or Vcc or GND. And, pins (Don’t use PIN, N.C.PIN) not used as device address may be set to any of ‘H’, 'L', and 'Hi-Z'.
Technical Note BR24T□□□-W Series ●Cautions on microcontroller connection ○RS 2 In I C BUS, it is recommended that SDA port is of open drain input/output. However, when to use CMOS input / output of tri state to SDA port, insert a series resistance Rs between the pull up resistance Rpu and the SDA terminal of EEPROM. This is controls over current that occurs when PMOS of the microcontroller and NMOS of EEPROM are turned ON simultaneously. Rs also plays the role of protection of SDA terminal against surge.
Technical Note BR24T□□□-W Series 2 ●I C BUS input / output circuit ○Input (A0, A1, A2, SCL, WP) Fig.54 Input pin circuit diagram ○Input / output (SDA) Fig.55 Input / output pin circuit diagram www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 17/21 2011.1 - Rev.
Technical Note BR24T□□□-W Series ●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 POR 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 tR, tOFF, and Vbot for operating POR circuit.
Technical Note BR24T□□□-W Series ●Order part number B R 2 ROHM type name 4 S2 T Operating temperature/ Power source Voltage T:-40℃～+85℃/ 1.7V～5.
Technical Note BR24T□□□-W Series SSOP-B8 3.0 ± 0.2 (MAX 3.35 include BURR) 0.3MIN 4.4±0.2 6.4±0.3 8 76 5 Tape Embossed carrier tape Quantity 2500pcs Direction of feed E2 The direction is the 1pin of product is at the upper left when you hold ( reel on the left hand and you pull out the tape on the right hand ) 1.15±0.1 1 23 4 0.15 ± 0.1 0.1 S 0.1 +0.06 0.22 -0.04 (0.52) 0.08 M 0.
Technical Note BR24T□□□-W Series MSOP8 2.8±0.1 4.0±0.2 8 7 6 5 0.6±0.2 +6° 4° −4° 0.29±0.15 2.9±0.1 (MAX 3.25 include BURR) Tape Embossed carrier tape Quantity 3000pcs Direction of feed TR The direction is the 1pin of product is at the upper right when you hold ( reel on the left hand and you pull out the tape on the right hand ) 1 2 3 4 1PIN MARK 1pin +0.05 0.145 –0.03 0.475 +0.05 0.22 –0.04 0.08±0.05 0.75±0.05 0.9MAX S 0.08 S Direction of feed 0.
