AS3955 datasheet(67/102 Pages) AMSCO

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ams Datasheet

Page 67

[v1-04] 2016-Feb-03

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AS3955 − Detailed Description

I²C Interface

Communication between AS3955 and microcontroller can be

done via a I²C interface and an additional interrupt signal.

AS3955 acts an I²C slave device, and supports single master,

multiple slave configurations. AS3955 I²C supports following

modes: Standard-mode, Fast-mode, Fast-mode Plus.

Figure 71:

I²C and Interrupt Signals

During I²C communication, the signal /SS should be set to low.

By setting the /SS to low, I²C interface is enabled. It is

recommended to keep signal /SS high whenever the I²C

interface is not used.

I²C interface supports the following modes:

• Internal registers read and write

• EEPROM read and write

• Buffer read and write

• Direct commands

Please note that the only I²C operations allowed, when logic

and EEPROM are supplied from VP_IO, are EEPROM and registers

reading and writing (see also Power Management).

I²C Slave Address

The I²C slave address is composed of 7 bits where the first 4

MSBs are fixed and the last 3 LSBs are programmable.

Figure 72:

I²C Slave Address

The value of bits A2:A0 can be set in the Configuration Byte

IC_CFG0.

Name

Signal

Signal Level

Description

/SS

Digital Input with pull up

CMOS

Should be set to high during I²C communication

SDA

Digital Output

CMOS

Serial Data output

SCL

Digital Input

CMOS

Clock for serial communication

IRQ

Digital Output

CMOS

Interrupt Output pin (active high)

I²C Slave Address

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