Datasheet > EA8945AQJ405

EA8945AQJ405

更新时间： 2022-02-26 13:55:51

品牌	Logo	应用领域
技领 - ACTIVE-SEMI		/
页数	文件大小	规格书
44页	1040K
描述
Advanced PMU for Atmel SAMA5Dx Series & SAM9 Series Processors

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EA8945AQJ405 数据手册

ACT8945A

Rev 6, 01-Feb-16

ERRATA INFO

Disable ACT8945AQJ305 I²C Interface

Errata Name: ACT8945A creates I²C BUS

To disable the I²C interface of ACT8945AQJ305

and configure the SDA and SCL pins to input logic

pins, customer can use I²C to write the following

commands in sequence below:

contention

Device Identification: Parts marked

ACT8945AQJ305

Description:

The ACT8945A features an I²C interface that only

supports standard single-byte I²C command. After it

detects a START condition, it will wait for its correct

device address to issue the Acknowledge (ACK) by

pulling the SDA low. Therefore, if the ACT8945A I²C

bus shares with a multiple-byte I²C device, it would

accidently issue an ACK once its address is detected

and pull SDA low during mass data transmission

between the MCU and the co-slave device. This

action would cause the I²C BUS to be frozen

unexpectedly.

1.Write address 0x0B with 0xEE

2.Write address 0x02 with 0x07

3.Write address 0x03 with 0x01

4.Write address 0x0B with 0xEF

5.Write address 0x02 with 0x07

6.Write address 0x03 with 0x01

Recommendation:

To avoid the I²C BUS contention, we highly

recommend customer to use ACT8945A I2C

separately from a multiple-byte I²C device such as a

touch screen controller.

However, in case the ACT8945A has to share the

I2C bus with a multiple-byte I²C device, the

ACT8945A features a function to allow customer to

disable its I²C interface to avoid the conflict.

Workaround:

For cases where ACT8945A I²C lines are already

shared with some other components, ACT8945A

features a function to allow user to disable its I²C

interface to avoid conflicts. The following I²C write

sequences perform this operation and configure

SDA and SCL as high-Z pin.

www.active-semi.com

- 42 -

ActivePMU^TMand ActivePath^TMare trademarks of Active-Semi.

I²C^TMis a trademark of NXP.

1...39 40 414243 44

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