ADT7460: Address selection

Q I would like to use several ADT7460 devices on one board. therefore, I would like to assign different addresses to these devices. The datasheet says that to assign an address, the ADDRESS_ENABLE pin must be pulled low on power-up. How long must this pin be pulled low before it can be released again? A After power-on reset, the ADT7463 enters Address Select Mode. In Address Select Mode, /ADDR_EN and ADDR_SEL pins directly drive the SMBus Address Register as a transparent latch. The SMBus address is latched on the 1st. valid SMBus transaction which addresses the ADT7463. More precisely, the SMBus address is latched on the low to high transition at the beginning of the 8th SCL pulse, when the serial bus address byte matches with the selected slave address set via the /ADDR_EN and ADDR_SEL pins. When the SMBus address is latched, the ADT7463 then exits Address Select Mode and any changes made to /ADD_EN or ADDR_SEL will have no effect. So in fact there are two points where the state /ADDR_EN and ADDR_SEL pins is critical. The pins must be stable during the serial bus address byte and on the 8th SCL pulse. We recommend that the state of the /ADDR_EN and ADDR_SEL pins are held constant during all SMBus transactions until after the first valid read/write to the ADT7463. Of course, holding the ADDR_EN and ADDR_SEL pins constant after power up becomes more important if you have multiple devices on the SMBus and the first write to the ADT7463 after power up occurs after SMBus reads and writes to other devices. The SMBus address of the ADT7463 is not latched until after the first read/write to the part, so it is important that the ADDR_EN and ADDR_SEL pins are correctly driven during bus activity which addresses other devices.

English

Forums
Popular Forums
Product Forums
View All
Application Forums
Design Center Forums
Learn
Highlighted Webinar

Upcoming Webinar: µModule Solution for Intelligent Motion Control
Precision feedback combined with advanced sensing, control, and seamless connectivity make up the building blocks for intelligent motion control. ADI offers...
Places
Libraries
Latest Webinars
View All Webinars
Community Hub
Challenge Yourself!
View All
What's Brewing
View All
Places
Resources
View All
Blogs
Highlighted Blogs

What Makes Field Bus Communication Unique
Field bus communication protocols are widely used across industries due to their simplicity, reliability, and adaptability. These protocols enable seamless...

An Interesting Power Supply Monitoring Example from a Functional Safety Standard
All electrical and electronic systems require power supplies, including safety systems. In this blog, I will examine the power supply example from Annex...
Latest Blogs
Read All Blogs
ADI Blogs
- EZ Spotlight
- The Engineering Mind
ContentZone
Visit ContentZone

ContentZone
Technical articles. Blogs. Videos. Your ADI content, all in one place.

View ContentZone

Featured Content

Featured Content Title
Blurb About Content
View Content By Industry
View Content By Technology
Partners
Partner Forums
Partner Libraries