AS3955 datasheet(55/111 Pages) AMSCO

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ams Datasheet

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[v1-01] 2015-Apr-29

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AS3955 − Detailed Description

Wired Interfaces

AS3955 host interface can be configured to be either SPI or I²C

at production (Fabrication Data FAB_CFG0). In both cases, the

/SS signal is also used to control the IC power state. By pulling

the /SS low, the chip interface or the chip itself is enabled /

powered (see Power Management). Note that interrupting SPI

/ I²C operations or issuing incomplete command sequence from

the MCU may result in corrupted data content. For more

information on EEPROM and buffer data reading and writing

see EEPROM Read and Write and Data Buffer sections.

SPI / I²C Access Modes

Figure 56:

Access Modes

Mode

MODE Byte (com. bits)

MODE Related Data

MODE

Trailer

Data byte(s)

EEPROM Write

000

Block Address

byte

4 bytes of block

data

EEPROM Read

111

Block Address

byte

N*4 bytes

Buffer Load

xxx

Data byte(s)

Buffer Read

xxx

Data byte(s)

COMMAND Mode

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