AS3956 datasheet(73/109 Pages) AMSCO

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ams Datasheet

Page 73

[v1-10] 2018-Apr-27

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AS3956 − Detailed Description

Immediate Slave Read

All I²C sequences for AS3956 starts with slave address and

read/write bit set to zero (write) so that MCU can send the

command byte to the AS3956. A special case is where the MCU

sets the read/write bit to one in the first byte. In this case the

AS3956 will send back the content of registers starting from

address 0x01. If the address is incremented beyond the address

space of the registers, the AS3956 will transmit back zeros. The

first returned byte by AS3956 is data value 0xFF.

Figure 74:

Immediate Slave Read

Writing and Reading EEPROM through I²C

EEPROM data can be read and written through I²C interface.

Arbitration between EEPROM accesses via the RF and SPI/I²C

interface are performed on a first-come-first-serve basis as

described in Interface Arbitration.

Block Address Byte

Both EEPROM Read and Write use Block Address byte to define

the EEPROM block address to be accessed. Seven MSB bits of

the Address Byte are used to define the address; while the last

bit is don’t-care (it is used to synchronize EEPROM access).

Figure 75:

EEPROM Block Address Byte over I²C

EEPROM Block Address

WA6

WA5

WA4

WA3

WA2

WA1

WA0

Slave address

SCL

SDA

11 1 1 1 1 11

0xFF

Reg addr. 0x01

Reg addr. 0x02

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