PCA9622DR datasheet(8/39 Pages) NXP

8 / 39 page

PCA9622_3

Product data sheet

Rev. 03 — 31 August 2009

8 of 39

NXP Semiconductors

PCA9622

16-bit Fm+ I2C-bus 100 mA 40 V LED driver

7.1.2 LED All Call I2C-bus address

• Default power-up value (ALLCALLADR register): E0h or 1110 000

• Programmable through I2C-bus (volatile programming)

• At power-up, LED All Call I2C-bus address is enabled. PCA9622 sends an ACK when

E0h (R/W = 0) or E1h (R/W = 1) is sent by the master.

See Section 7.3.8 “ALLCALLADR, LED All Call I2C-bus address” for more detail.

Remark: The default LED All Call I2C-bus address (E0h or 1110 000) must not be used

as a regular I2C-bus slave address since this address is enabled at power-up. All the

PCA9622s on the I2C-bus will acknowledge the address if sent by the I2C-bus master.

7.1.3 LED Sub Call I2C-bus addresses

• 3 different I2C-bus addresses can be used

• Default power-up values:

– SUBADR1 register: E2h or 1110 001

– SUBADR2 register: E4h or 1110 010

– SUBADR3 register: E8h or 1110 100

• Programmable through I2C-bus (volatile programming)

• At power-up, Sub Call I2C-bus addresses are disabled. PCA9622 does not send an

ACK when E2h (R/W = 0) or E3h (R/W = 1), E4h (R/W = 0) or E5h (R/W = 1), or

E8h (R/W = 0) or E9h (R/W = 1) is sent by the master.

See Section 7.3.7 “SUBADR1 to SUBADR3, I2C-bus subaddress 1 to 3” for more detail.

Remark: The default LED Sub Call I2C-bus addresses may be used as regular I2C-bus

slave addresses as long as they are disabled.

7.1.4 Software Reset I2C-bus address

The address shown in Figure 5 is used when a reset of the PCA9622 needs to be

performed by the master. The Software Reset address (SWRST Call) must be used with

R/W = logic 0. If R/W = logic 1, the PCA9622 does not acknowledge the SWRST. See

Section 7.6 “Software reset” for more detail.

Remark: The Software Reset I2C-bus address is a reserved address and cannot be used

as a regular I2C-bus slave address or as an LED All Call or LED Sub Call address.

Fig 5.

Software Reset address

002aab416

R/W

PCA9622DR Datasheet(PDF) 8 Page - NXP Semiconductors