PCA9665D datasheet(53/91 Pages) PHILIPS

53 / 91 page

PCA9665_2

Product data sheet

Rev. 02 — 7 December 2006

53 of 91

NXP Semiconductors

PCA9665

Fm+ parallel bus to I2C-bus controller

Remark: Request to send or receive a number of bytes equal to 0 or higher than 68

(BC[6:0] = 000 0000 or BC[6:0] > 100 0100) will cause no data to be transferred and an

interrupt to be generated after writing to the I2CCON register. I2CSTA status register is

loaded with FCh that indicates that an invalid value was requested to be loaded in

I2CCOUNT.

8.7 Acknowledge management (I2C-bus addresses and data) in Byte and

Buffered modes

Data acknowledge/not acknowledge management can be controlled on a byte basis (Byte

mode) or on a sequence basis (Buffered mode). The PCA9665 can be programmed to

respond (ACK) or not (NACK) to two different I2C-bus addresses. Table 43 shows how this

is performed based on the different control bits (AA, GC, LB and MODE) and the different

modes.

[1]

Assumption is that Data Received follows the address (as deﬁned in column “Address”); valid for slave

mode only.

[2]

Unless the master sends a STOP command before.

Table 43.

Own slave address, General Call address, and Data acknowledge management

MODE

Address

Data received[1]

Master mode: the PCA9665 generates a START command and controls the I2C-bus

not applicable

data (each byte) = NACK

not applicable

data (each byte) = ACK

not applicable

all the bytes (BC[6:0] bytes) = ACK

not applicable

all the bytes except the last one

(BC[6:0] bytes

− 1) = ACK;

last byte = NACK

Slave mode: I2C-bus message starting with the PCA9665’s Own Slave address

Own address = NACK

data (each byte) = NACK

Own address = ACK

data (each byte) = ACK

Own address = NACK

all the bytes (

≤ BC[6:0] bytes) = ACK

Own address = NACK

all the bytes except the last one

(BC[6:0] bytes - 1) = ACK; last

byte=NACK[2]

Own address = ACK

all the bytes (

≤ BC[6:0] bytes) = ACK

Own address = ACK

all the bytes except the last one

(BC[6:0] bytes - 1) = ACK;

last byte = NACK[2]

Slave mode: I2C-bus message starting with the General Call address

GC address = NACK

data (each byte) = NACK

GC address = ACK

data (each byte) = NACK

GC address = ACK

data (each byte) = ACK

GC address = NACK

data (each byte) = NACK

GC address = ACK

all the bytes (

≤ BC[6:0] bytes) = ACK

GC address = ACK

all the bytes except the last one

(BC[6:0] bytes - 1) = ACK;

last byte = NACK[2]

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