ROHM BU1850MUV Data Sheet
Summary
This specialized GPIO Expander IC provides a comprehensive solution for embedded systems facing limited I/O ports. It manages up to eight general-purpose digital input/output channels using an I²C interface, allowing control of output states and monitoring of input states via software writes and reads. The chip features key safety functions like built-in power-on reset and powerful interrupt capabilities that reduce CPU polling overhead. The manual provides detailed technical specifications—including operational parameters, pin assignments, and power modes—making it ideal for engineers developing robust and expanded electronics applications.
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GPIO ICs Series
GPIO Expander IC
No.09098EAT02
BU1850MUV
●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) An 8-Port General purpose input/output interface 150kΩPull-down resistance. 2) NMOS Open-drain output interrupt controller with up to 1us pulse noise filter and bit mask function for individual GPIO port. 3) 3volt tolerant Input 4) Built-in Power On Reset 5) 3mmx3mm small package
●Absolute maximum ratings (Ta=25 o C)
Parameter Symbol Rating Unit comment
VDD -0.3 ~ +4.5 V VDD≦VDDIO
Supply Voltage*1
VDDIO -0.3 ~ +4.5 V VI -0.3 ~ VDD +0.3*1 V XRST, ADR
Input voltage
VIT -0.3 ~ 4.5 V XINT, SCL, SDA, GPIO[7:0]
Storage temperature range Tstg -55 ~ +125 ℃
Package power PD 272*2 m W
This IC is not designed to be X-ray proof. *1 It is prohibited to exceed the absolute maximum ratings even including +0.3 V. *2 Package dissipation will be reduced each 2.72m W/ o C when the ambient temperature increases beyond 25 o C.
●Operating conditions
Parameter Symbol Min Typ Max Unit Conditions
Core, XINT, XRST,
Supply voltage range (VDD) VVDD 1.65 1.80 3.6 V SCL, SDA, ADR,
Power On Reset
Supply voltage range (VDDIO) VVDDIO 1.65 1.80 3.6 V GPIO[7:0]
VIN -0.2 - VVDD+0.2 V XRST, ADR
Input voltage range
XINT, SCL, SDA,
VINT -0.2 - 3.6 V
GPIO[7:0]
Operating temperature range Topr -30 - +85 ℃
I2C operating frequency FI2C - - 400 k Hz Slave
www.rohm.com 2009.09 - Rev.A 1/17 © 2009 ROHM Co., Ltd. All rights reserved.
Page Summary Contents For ROHM BU1850MUV Data Sheet
Manual Details
| Brand | ROHM |
|---|---|
| Pages | 18 |
| File Size | 407.74 KB |
| Published | June 17, 2026 |
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Frequently Asked Questions
What is the max I2C operating frequency?
The maximum I2C operating frequency is 400 kHz in slave mode.
How do I reset the device?
Set XRST to Low to enter power down state and reset, or connect XRST to VDD to use built-in power on reset.
What is the operating temperature range?
The operating temperature range is -30°C to +85°C.
How many GPIO ports does this expander have?
It has an 8-port general purpose input/output interface.