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BR93H46RF-2LB Datasheet(HTML) 13 Page - Rohm

Part No. BR93H46RF-2LB
Description  Serial EEPROM Series Industrial EEPROM 125℃ Operation Microwire BUS EEPROM (3-wire)
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Maker  ROHM [Rohm]
Homepage  http://www.rohm.com
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BR93H46RF-2LB Datasheet(HTML) 13 Page - Rohm

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Datasheet
Datasheet
13/25
www.rohm.com
TSZ22111・15・001
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ02201-0R1R0G100250-1-2
BR93H46RF-2LB
27.Feb.2014 Rev.002
Description of Operation
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.
In connecting one EEPROM to a microcontroller, connect it as shown in Figure.29-(a) or Figure.29-(b). And, when using the
input and output common I/O port of the microcontroller, connect DI and DO via a resistor as shown in Figure.29-(b) (Refer to
pages 19-20), wherein connection by 3 lines is possible.
In case of using multiple EEPROM devices, refer to Figure. 29-(c).
Communications of the Microwire Bus are started by the first “1” input after the rise of CS. This input is called the “Start Bit”.
After input of the start bit, the “Ope Code”, Address, and Data are then inputted consecutively. Address and Data are all
inputted with MSB first.
All “0” signal inputs after the rise of CS up to the start bit is ignored. Therefore, if there is a limitation in the bit width of PIC of
the microcontroller, it is possible to input “0” before the start bit to control the bit width.
Command Mode
・ Input the address and the data in MSB-first order.
・ As for *, input either V
IH or VIL.
*Start bit
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.
*1
For READ, after setting the command, the data output of the selected address starts.
Then, in a sequential order of addresses,
the data of the next address will be outputted , and will continuously output data of succeeding addresses with the use of a continuous SK clock input.
(Auto-Increment Function)
*2
When the WRITE and the WRITE-All commands are executed, the previous data written in the selected memory cell are automatically deleted first, then the
input data is written next.
Command
Start
bit
Ope
code
Address
Data
BR93H46RF-2LB
Read (READ)
*1
1
10
A5,A4,A3,A2,A1,A0
D15 to D0(READ DATA)
Write enable (WEN)
1
00
1
1
* * * *
Write (WRITE)
*2
1
01
A5,A4,A3,A2,A1,A0
D15 to D0(WRITE DATA)
Write all (WRAL)
*2
1
00
0
1
* * * *
D15 to D0(WRITE DATA)
Write disable (WDS)
1
00
0
0
* * * *
Figure 29. Connection Methods with Microcontroller
Figure 29-(a). Connection by 4 lines
CS
SK
DO
DI
CS
SK
DO
CS
SK
DI
DO
Figure 29-(b). Connection by 3 lines
CS
SK
DI
DO
CS3
CS1
CS0
SK
DO
DI
Figure 29-(c). Connection example of multiple devices
Micro-
controller
BR93H46RF
Micro-
controller
BR93H46RF
Micro-
controller
Device 1
Device 2
Device 3


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