AS1163 datasheet(65/91 Pages) AMSOSRAM

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AS1163

Command and register description

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Figure 25: I2CREAD 12-bit addressing

The I2CCFG status register reflects the status of the I²C transaction (fields I2C_BUSY and

I2C_NACKACK) but no response telegram is sent with the read data. Instead, the data is

stored in a 64-bit register inside the SAID, which can be read with the telegram READLAST.

For details, please refer to application note “I²C bridge – SAID as I²C gateway AN001090”.

7.12.17

I2CWRITE (0x19)

Writes bytes to a register in an I²C device.

The SAID I²C bridge first asserts I2CCFG.I2C_BUSY. Next, it starts an I²C transaction

consisting of a single write segment. This contains the register address, followed by data.

When the device does not acknowledge one of the bytes, the transaction is aborted, and

I2CCFG.NACK_ACK is asserted. When the device does acknowledge all bytes,

I2CCFG.NACK_ACK is de-asserted. After abort or successful completion I2CCFG.I2C_BUSY

is de-asserted; it would stay asserted as long as the target device pulls the SCL low (“I²C clock

stretching”).

The PSI of the I2CWRITE telegram indicates how many bytes will be written, address bytes

and data bytes together.

In 8-bit addressing, the first byte is the I²C device address (7-bit I²C address plus adding a 0

LSB). The second byte is the I²C register address where to write to. Next come 1 to 6 data

bytes. Because a PSI of 7 cannot be encoded, 5 data bytes cannot be sent.

Figure 26: I2CWRITE 8-bit addressing

If 12-bit addressing is asserted (I2CCFG. I2C_12_BIT_ADDR), the first byte is the I²C device

address (7-bits with appended 0) and the second and third bytes form the 12-bit I²C register

address where to write to. Only the 12 LSBs in the telegram are significant, the I²C transaction

uses 16 bits, prepending 0b0000. Next come 1 to 5 data bytes. Because a PSI of 7 cannot be

encoded, 4 data bytes cannot be sent.

AS1163 Datasheet(PDF) 65 Page - ams-OSRAM AG