AP0100CS datasheet(44/73 Pages) ONSEMI

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AP0100CS HDR: Image Signal Processor (ISP)

Protocol

AP0100CS/D Rev. 6, Pub. 1/16 EN

©Semiconductor Components Industries, LLC,2016.

Slave Address/Data Direction Byte

Bits [7:1] of this byte represent the device slave address and bit [0] indicates the data

transfer direction. A “0” in bit [0] indicates a write, and a “1” indicates a read. The default

slave addresses used by the AP0100CS are 0x90 (write address) and 0x91 (read address).

Alternate slave addresses of 0xBA (write address) and 0xBB (read address) can be

selected by asserting the SADDR input signal.

Message Byte

Message bytes are used for sending register addresses and register write data to the slave

device and for retrieving register read data. The protocol used is outside the scope of the

two-wire serial interface specification.

Acknowledge Bit

Each 8-bit data transfer is followed by an acknowledge bit or a no-acknowledge bit in the

SCLK clock period following the data transfer. The transmitter (which is the master when

writing, or the slave when reading) releases SDATA. The receiver indicates an acknowl-

edge bit by driving SDATA LOW. As for data transfers, SDATA can change when SCLK is

LOW and must be stable while SCLK is HIGH.

No-Acknowledge Bit

The no-acknowledge bit is generated when the receiver does not drive SDATA low during

the SCLK clock period following a data transfer. A no-acknowledge bit is used to termi-

nate a read sequence.

Stop Condition

A stop condition is defined as a LOW-to-HIGH transition on SDATA while SCLK is HIGH.

Typical Operation

A typical READ or WRITE sequence begins by the master generating a start condition on

the bus. After the start condition, the master sends the 8-bit slave address/data direction

byte. The last bit indicates whether the request is for a READ or a WRITE, where a “0”

indicates a WRITE and a “1” indicates a READ. If the address matches the address of the

slave device, the slave device acknowledges receipt of the address by generating an

acknowledge bit on the bus.

If the request was a WRITE, the master then transfers the 16-bit register address to which

a WRITE will take place. This transfer takes place as two 8-bit sequences and the slave

sends an acknowledge bit after each sequence to indicate that the byte has been

received. The master will then transfer the 16-bit data, as two 8-bit sequences and the

slave sends an acknowledge bit after each sequence to indicate that the byte has been

received. The master stops writing by generating a (re)start or stop condition. If the

request was a READ, the master sends the 8-bit write slave address/data direction byte

and 16-bit register address, just as in the write request. The master then generates a

(re)start condition and the 8-bit read slave address/data direction byte, and clocks out

the register data, 8 bits at a time. The master generates an acknowledge bit after each 8-

bit transfer. The data transfer is stopped when the master sends a no-acknowledge bit.

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