Rohm BU8272GUW Technical Note

GPIO ICs Series

GPIO Expander IC

No.09098EAT01

BU8272GUW

●Description GPIO expander is useful especially for the application that is in short of IO ports. It can 1. Control GPIO output states by I2C write protocol. 2. Know GPIO input states by I2C read protocol. Furthermore,it has the interrupt function that can release CPU from polling the registers in the GPIO expander. GPIO expander are also equipped with Built-in power on reset, 3V tolerant input,and NMOS open-drain output.

●Features 1) 400Kbps, 2-Wire serial interface 2) Interrupt output 3) 20-bit General purpose input/output interface 8-bit and 12-bit IO groups are designed for different power supply voltages from the device core voltage supply

● Absolute Maximum Ratings (Ta=25℃)

Item Symbol Value Unit comment

VDD -0.3 ~ +2.5 V -

Supply Voltage VDDI2C -0.3 ~ +3.5 V -

VDDIO -0.3 ~ +3.5 V -

-0.3 ~ VDD +0.5 *1 V CMOS Core

Input voltage VI -0.3 ~ VDDI2C +0.5 *1 V CMOS I/O for 2-Wire

-0.3 ~ VDDIO +0.5 *1 V CMOS I/O

Storage temperature range Tstg -55 ~ +125 o C - Package power PD 310 *2 m W - *1 The input voltage range doesn't exceed absolute maximum ratings even including +0.5 V. *2 Package dissipation will be reduced each 3.1m W/ o C when the ambient temperature increases beyond 25 o C.

This IC is not designed to be X-ray proof.

● Recommended Operating Conditions (Ta=-25 o C ~+85 o C)

Limit

Item Symbol Unit Condition

Min Typ Max

Supply voltage (VDD） VVDD 1.65 1.80 1.95 V Core Supply voltage（VDDI2C） VVDDI2C 1.65 - 3.45 V 2-Wire,INT,ADR, XRST Supply voltage（VDDIO1） VVDDIO1 1.65 - 3.45 V GPIO[7:0] Supply voltage（VDDIO2） VVDDIO2 1.65 - 3.45 V GPIO[19:8] 2-Wire operating Frequency FI2C - - 400 KHz Slave

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