BR93L86-W Rohm Semiconductor, BR93L86-W Datasheet - Page 28

• Manufacturer Part Number: BR93L86-W
• Description: IC EEPROM 16KBIT 2MHZ 8DIP
• Manufacturer: Rohm Semiconductor

Specifications of BR93L86-W

• Format - Memory: EEPROMs - Serial
• Memory Type: EEPROM
• Memory Size: 16K (1K x 16)
• Speed: 2MHz
• Interface: Microwire, 3-Wire Serial
• Voltage - Supply: 1.8 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 8-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

●Description of operations
●Command mode
●Write all area
© 2011 ROHM Co., Ltd. All rights reserved.
BR93L□□-W Series, 93A□□-WM Series, BR93H□□-WC Series
www.rohm.com
Communications of the Microwire Bus are carried out by SK (serial clock), DI (serial data input),DO (serial data output) ,and
CS (chip select) for device selection.
When to connect one EEPROM to a microcontroller, connect it as shown in Fig.29-(a) or Fig.29-(b). When to use the input
and output common I/O port of the microcontroller, connect DI and DO via a resistor as shown in Fig.29-(b) (Refer to pages
31/35.), and connection by 3 lines is available.
In the case of plural connections, refer to Fig. 29-(c).
Communications of the Microwire Bus are started by the first “1” input after the rise of CS. This input is called a start bit. After
input of the start bit, input ope code, address and data. Address and data are input all in MSB first manners.
“0” input after the rise of CS to the start bit input is all ignored. Therefore, when there is limitation in the bit width of PIO of the
microcontroller, input “0” before the start bit input, to control the bit width.
・ Input the address and the data in MSB first manners.
・ As for *, input either VIH or VIL.
*Start bit
*1 As for read, by continuous SK clock input after setting the read command, data output of the set address starts, and
*2 When the read and the write all commands are executed, data written in the selected memory cell is automatically deleted, and input data is written.
*3 For the write all command, data written in memory cell of the areas designated by B2, B1, and B0, are automatically
・The write all command is written in bulk in 2Kbit unit.
Fig.29-(a) Connection by 4 lines
Read (READ)
Write enable (WEN)
Write (WRITE)
Write all (WRAL)
Write disable (WDS)
Acceptance of all the commands of this IC starts at recognition of the start bit.
The start bit means the first “1” input after the rise of CS.
The write area can be selected up to 3bit. Confirm the settings and write areas of the above B2, B1, and B0.
address data in significant order are sequentially output continuously. (Auto increment function)
deleted, and input data is written in bulk.
controller
Command
Micro-
DO
CS
SK
B2 B1 B0
DI
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
*1
*2
*2,3
0
1
0
1
0
1
0
1
BR93HXX
CS
SK
DI
DO
Start
bit
1
1
1
1
1
080h～0FFh
180h～1FFh
280h～2FFh
380h～3FFh
000h～07Fh
100h～17Fh
200h～27Fh
300h～37Fh
Write area
Fig.29-(b) Connection by 3 lines
Fig.29 Connection method with microcontroller
code
Ope
10
00
01
00
00
controller
Micro-
A7,A6,A5,A4,A3,A2,A1,A0
1 1 * * * * * *
A7,A6,A5,A4,A3,A2,A1,A0
0 1 * * * * * B0
0 0 * * * * * *
DO
CS
SK
BR93H56/66-WC
28/40
BR93HXX
CS
SK
DI
DO
Address
Designation of B2, B1, and B0
A9,A8,A7,A6,A5,A4,A3,A2,A1,A0
1 1 * * * * * * * *
A9,A8,A7,A6,A5,A4,A3,A2,A1,A0
0 1 * * * * * B2,B1,B0
0 0 * * * * * * * *
Fig.29-(c) Connection example of plural devices
controller
H56
H66
H76
H86
A7 and B0 of BR93H56-WC becomes Don't Care.
A9 and B2 of BR93H76-WC becomes Don't Care.
BR93H76/86-WC
Micro-
CS3
CS1
CS0
DO
SK
DI
Device 1
B2
＊
＊
＊
B1
B1
＊
＊
Device 2
D15~D0(READ DATA)
D15~D0(WRITE DATA)
D15~D0(WRITE DATA)
B0
B0
B0
＊
Technical Note
2011.02 - Rev.F
Data
Device 3