Datasheet

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Valid Read Sequences

Non-Valid Sequences

TPS65810

TPS65811

SLVS658B – MARCH 2006 – REVISED FEBRUARY 2007

The TPS65810 always ACKs its own address.

S hA1 bqA

Upon receiving hA1, TPS65810 starts at wherever the RAM address register is pointing. The START and the

STOP both act as priority interrupts. If the host has been interrupted and is not sure where it left off it can send a

STOP and reset the TPS65810 state machine to the WAIT state; once in WAIT state, the TPS65810 ignores all

activity on the SCL and SDA lines until it receives a START. A repeated START and START in the I

specification are both treated as a START.

S hA0 bqA hCMD bqA P

S hA0 bqA hCMD bqA S hA1 bqA bqDATA hN P

S hA1 bqA bqDATA hN P

Incremental read sequences

S hA1 bqA bqDATA hA bqDATA hA bqDATA hA bqDATA hA ... bqDATA hA P

START and non-hA0 or non-hA1 Address

A START followed by an address which is not bqA0 or bqA1 is NACKED.

S hA_N bqN

Attempt to Specify Non-Allowed READ Address

If the CMD points to a non-allowed READ address (reserved registers), bq sends a NACK back to the host, and

it does not load the address in the RAM address register. Note that TPS65810 NACKS whether a stop is sent or

not.

S hA0 bqA hCMD_N bqN P

S hA0 bqA hCMD_N bqN

Attempt to Specify Non-Allowed WRITE Address

If the host attempts to WRITE to a READ-ONLY or non-accessible address TPS65810 ACKS the CMD

containing the allowed READ address, loads the address into the address register and NACKS after the host

sends the next data byte. After issuing the NACK TPS65810 returns to WAIT state. A subsequent hA1 READ

could read this address.

S hA0 bqA hCMD bqA hDATA bN

Product Folder Link(s): TPS65810 TPS65811