PCA9570DP datasheet(5/32 Pages) NXP

5 / 32 page

PCA9570

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Product data sheet

Rev. 4 — 17 September 2014

5 of 32

NXP Semiconductors

PCA9570

Remote 4-bit general purpose outputs for 1 MHz I2C-bus

Functional description

Refer to Figure 1 “Block diagram of PCA9570”.

7.1 Device address

Following a START condition, the bus master must send the address of the slave it is

accessing and the operation it wants to perform (read or write). The address of the

PCA9570 is 48h as shown in Figure 6.

7.2 Software Reset Call, and device ID addresses

Two other different addresses can be sent to the device.

• General Call address: allows resetting the device through the I2C-bus upon reception

of the right I2C-bus sequence. See Section 7.2.1 “Software Reset” for more

information.

• Device ID address: allows reading ID information from the device (manufacturer, part

identification, revision). See Section 7.2.2 “Device ID (PCA9570 ID field)” for more

information.

Fig 6.

PCA9570 device address

R/W

002aag831

fixed

slave address

Fig 7.

General Call address

Fig 8.

Device ID address

002aac115

R/W

002aac116

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