AS3956 datasheet(69/107 Pages) AMSCO

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ams Datasheet

Page 69

[v1-11] 2018-Nov-14

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AS3956 − Detailed Description

I²C Interface

Communication between AS3956 and microcontroller can be

done via a I²C interface and an additional interrupt signal

(pin IRQ). Please note a 100k ohm pull down resistor is

recommended to be connected to the IRQ pin to prevent IRQ

from floating when /SS is high. AS3956 acts an I²C slave device,

and supports single master, multiple slave configurations.

AS3956 I²C supports following modes: Standard-mode,

Fast-mode, Fast-mode Plus. In addition to Schmitt triggers on

all digital input lines a glitch suppression filter is implemented

on the SCL and SDA input lines and suppresses glitches up to

Tgs_i2c in length.

Figure 68:

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. The I²C bus is reset when /SS is high.

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).

Name

Signal

Signal Level

Description

/SS

Digital Input with pull-up

CMOS

Should be set to low 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)

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