BU9844GUL-W_13 Datasheet, PDF (19/30 Pages) Rohm – WLCSP EEPROM

BU9844GUL-W (16Kbit)
Datasheet
4. Pull up resistance of SCL terminal
When SCL control is made at CMOS output port, there is no need, but in the case there is timing where SCL becomes
“Hi-Z”, add a pull up resistance. As for the pull up resistance, one of several kΩ to several ten kΩ is recommended in
consideration of drive performance of output port of microcontroller.
A2, WP process
1. Process of device address terminals (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 of pull down, or V_CC or GND.
2. Process of WP terminal
WP terminal is the terminal that prohibits and permits write in hardware manner. In “H” status, only READ is available and
WRITE of all addresses is prohibited. In the case of “L”, both are available. In the case to use it as an ROM, it is
recommended to connect it to pull up or V_CC. In the case to use both READ and WRITE, control WP terminal or connect it
to pull down or GND.
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TSZ02201-0R2R0G100470-1-2
17.Sep.2013 Rev.002